TESA MH3D User Manual Download Page 68

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Page 4-12

User's Manual

MH3D

CAUTION

Be sure air pressure is shut off before attempting maintenance work on
the air

system. Make sure the bowl is properly in place and latched before

turning on

air pressure.

If it becomes necessary to replace an air filter or a filter element, obtain one from
the factory. To replace the filter:

Turn off air to machine at supply. Make sure air pressure has gone to zero.

Using the release latch, remove steel bowl guard shield from filter.

Remove plastic filter bowl.

Unscrew filter element.

Assemble the new filter element and replace bowl and shield.

•

The coalescing filter element may be washed in safety solvent and then dried

and reused once or twice and then replaced. Air filters should be washed or
replaced at intervals of 6 months if the air line is dirty.

•

The coalescing filter has an O-ring on its upper surface. Be sure the O-ring is

seated properly in the groove before reinstalling.

• If the filter gets dirty fairly quickly, place another air filter/regulator upstream

of the machine.

• If excessive water is present within the air system at your facility use a

Refrig-

erated Air Dryer

Changing the Air Filter

Air Inlet

70-120 psi

(4.8-8.3 BAR)

Automatic Drain

Particle Filter

Pressure Gage

Particle Filter

Pressure Adjust
Lock Knob

To Machine
58 psi (4 BAR)

Automatic Drain

*Not Shown - Optional Air

Saver Valve

Summary of Contents for MH3D

Page 3: ...ZX Carriage 2 7 Z Rail 2 8 Air Control and Filter 2 9 Air System 2 10 Air Bearings 2 11 Measuring System 2 12 ReferenceOffsets 2 13 Probes 2 14 TESASTAR Probe 2 14 TESASTAR_I Probe 2 14 ElectronicSystem 2 15 Controller 2 16 MH3D Rear Connections 2 17 MH3D Control Box 2 17 Cables 2 18 CHAPTER 3 Operation 3 1 Operator Safety 3 3 Using a Desk Mouse 3 6 Using a ZMouse 3 7 Starting Stopping 3 8 Moving ...

Page 4: ...ety 4 3 General Safety Practices 4 3 TheMachine sEnvironment 4 3 Electronics 4 4 Covers 4 4 Pneumatics 4 4 MaintenanceIntervals 4 5 Daily or Every 8 Hours 4 6 Monthly or 165 Hours 4 6 Every Three Months or 500 Hours 4 6 MaintenanceLog 4 7 MachineTroubleshooting 4 8 Cleaning Glass Scales 4 11 Changing the Air Filter 4 12 CHAPTER 5 Glossary 5 1 CHAPTER A Video Optical Probe A 1 Installation A 3 Moun...

Page 7: ...air bearing system allow the attainment and maintenance of high accuracies Combining these features with the many optional accessories and software packages available allows the most difficult measurements to be performed on a time saving production basis Since minor changes may be made periodically by TESA to improve machine performance some components of your particular system may differ from th...

Page 8: ...nd provided further that there is satisfactory documentation that the software has been installed maintained and operated in accordance with instruc tions in the User s Manual and provided further that there is satisfactory docu mentation from the customer that a software defect exists In addition there may be specified Occupational Safety Health Standards Warranties which if applicable to the pro...

Page 9: ...ed at no charge by TESA when this equipment is in operation in Europe In the event that you should require information or service assistance for your MH3D it is recommended that you call the dealer from whom the machine was purchased or one of the TESA regional offices Due to the complexity of this machine we recommend only TESA factory authorized service centers be used Warranty Service ...

Page 10: ... as a guide to establish safe operating and maintenance procedures Additional information on the safe operation and guarding of machines is available from the United States Department of Labor Every effort should be made to keep your machine safe A daily safety inspection should be made in addition to the normal maintenance inspection Machine operators should be aware of safe operating procedures ...

Page 11: ...recision measuring surface that is practically maintenance free M10 threaded stainless steel inserts imbedded into the granite table for securingtheworkpiece Air bearings for frictionless movement of all axes A fully pneumatic counterbalanced column infinitely adjustable for varying probe weights with a built in braking device A Z Rail Probe Holder that accommodates a wide variety of probes and ac...

Page 12: ...ocking Lever 6 Z Rail 7 X Z Carriage 8 Counterbalance Adjust Knob 9 Axis Lock Switches Fine Adjust Engagement 10 Probe 11 Control Box and VGA Monitor 12 Stand optional 13 ZMouse 14 Air Supply rear 15 Air Bearings not visible 16 Measuring System not visible 17 Machine Leveling Feet 18 Anti tip Bolts 19 Granite Leveling Feet not visible 20 Fine Adjustment Knob 1 8 7 9 20 3 2 4 5 6 13 10 11 17 18 ...

Page 13: ...l probe holder 6 Z RAIL An adjustable counterbalanced rail that is movable vertically in the carriage for making Z axis measurements The rail houses a pneumatic counterbalance that is infinitely adjustable for varying probe weights It is also provided with the means for attaching various types of probes and accessories 7 X Z CARRIAGE A structure movable on the rail for X axis measure ments The car...

Page 14: ...ays 16 MEASURING SYSTEM A highly accurate opto electric system con sisting of a scale and an encoder head which sends electronic signals to the readout as it moves along the scale 17 MACHINE LEVELING FEET Three screws and pads used to isolate the machine from vibrations and to level the machine 18 ANTI TIP BOLTS Two bolts in the machine base that prevent the machine from tipping if it is bumped or...

Page 16: ... o granite 98 kg 215 lbs Weight Completesystem 190 kg 416 lbs ShippingWeight 250 kg 549 lbs Maximum Part Weight 227 kg 500 lbs Part Size Capability X Y Z 600 x 750 x 430mm 24 x 30 x 17 2 in OPERATIONAL REQUIREMENTS Calibration Temperature 20 C 1 C 68 F 2 F Operating Temp Range 13 to 35 C 55 4 to 95 F Storage Temperature 30 to 60 C 22 to 140 F Air Input 4 8 8 3 BAR 70 120 psi AirConsumption 21L min...

Page 19: ...ve the top of the bench These bolts prevent the MH3D from tipping if it should be bumped or loaded in an unbalanced condition Note These anti tip bolts Must Not touch the bench under normal conditions Three ball end screws fastened in the top of the base provide a three point support for the work table These screws are leveled at the factory and do not normally require adjustment These screws shou...

Page 20: ...that appear in the granite are not defects but rather natural concentrations or absences of black magnetite mineral These color variations do not affect the hardness durability or accuracy of the granite surface A number of stainless steel M10 threaded inserts are uniformly spaced through out the measuring area for clamping work pieces to the table Note Bolts used for clamping the work pieces must...

Page 21: ...essed into the Y Rail Note The scale s protected by a cover The Y Roll Rail is also a lightweight hardcoated aluminum rail that is both bolted and epoxied to the right side of the base This Roll Rail supports the right inboard leg of the bridge with air bearings on top and underneath the rail It is very important that the rails be kept clean and not be bumped when parts are loaded and unloaded Nev...

Page 22: ...ase the fine adjust mechanisms These mechanisms mounted on the X Y and Z axes are used for precise adjustment of the individual axes The Y axis encoder is mounted in the lower part of the leg beneath an access plate Elastomeric bumpers on the leg act as stops when contacting the base at the end of travel The right leg is also an aluminum casting and contains two 2 air bearings for virtually fricti...

Page 23: ... move ment and support in the X direction The ZX Carriage also contains eight 8 air bearings that support the Z rail The X axis encoder and the Z axis encoder are located under removable covers at the back of the machine Removing these covers provides access to the Z axis scale Cable mounts are located at the rear of the carriage and elastomeric bumpers on each end act as stops against the legs in...

Page 24: ...il will drop on the table The Z rail has a built in failsafe brake that operates off the pneumatic system If air pressure is lost in the counter balance the Z axis air bearings will lock preventing the rail from dropping on the work table A probe holder built into the bottom of the Z rail has a locking lever and spring plunger detent to hold the probe in place while clamping The orientation of the...

Page 25: ...ion and void the machine warranty A second regulator controls the air pressure in the counterbalance cylinder This regulator is mounted on the right side of the rear cover of the ZX cariage and is adjusted to compensate for varying probe weights Always hold the Z rail firmly when unlocking the Z axis and adjusting the counterbalance The knob must be rotated clockwise to increase the lift for heavi...

Page 26: ... front preload back Right P A R F Z bearings 049707 049745 049749 049723 049905 049905 049906 back back Left 4 8 b ar 70 ps i 0497 46 4 0 b ar 58 ps i 4 8 bar 70 psi 049746 4 0 bar 58 psi right Axe Y P atins ja mbe gauche Axe Y left bottom droite X Y Z bottom preload Air bearings Axe X back pr eload left preload front preload left bottom right bottom P A R F Bearings Axe Z 049707 049745 049749 049...

Page 27: ... surface and is uniformly distributed throughout the surface by a system of grooves Air pressure between the bearing and the rail causes the bearing to float allowing air to escape The bearing retracts until the pressure is equalized by the preload or weight on the bearing The air bearings are adjustable however since the MH3D is calibrated with the air bearings at a given setting any adjustments ...

Page 28: ...me intervals as the scale is moved directly over the scale The reticle like the scale is made of optical glass with opaque lines and transpar ent divisions As the reticle is moved over the scale the reflective lines of the scale are alternately covered and uncovered As the reticle lies between the scale and the light source the intensity of the light reaching the receiver varies as the reticle or ...

Page 29: ...were measured with the probe detent engaged in the probe holder All values should be verified by the machine operator Ball Probe X Axis 0 Y Axis 0 Z Axis 70 TESASTAR X Axis 10 Y Axis 0 Z Axis 95 TESASTAR_I X Axis 0 Y Axis 5 7 Z Axis 76 The origin of the coordinate system shown represents the machine origin The arrows represent the positive direction of the machine s axes in terms of machine coordi...

Page 30: ...nd All Rights Reserved Page 2 14 User s Manual MH3D Probes TESASTAR Probe TESASTAR_I Probe Shank Dia 9 5 mm dia 2 mm 03969041 047866 047714 Probe Stylus 03969042 Star Knob 047778 047783 009421 TESASTAR 03939020 Probe body ...

Page 31: ...vate the item Measurement points are taken by pressing the Measurement XYZ button on the mouse after positioning the hard probe on the desired surface of the part Measurement points can also be taken by deflecting an electronic probe TTP on the part surface Select Measurement XYZ Cursor Movement The display screen is a VGA monitor with large easy to read characters and a choice of languages The di...

Page 32: ...wer switch under the front left edge of the console A MH3D Software Card A PCMCIA Smart Card for storing programs A 32 bit RISC processor A serial output parallel port A bright clear VGA monitor CAUTION Do not attempt to connect or disconnect any cables when the power is on Personal injury and or electrical damage may occur Controller MH3D Display ...

Page 37: ...to the machine While it is impossible to anticipate every situation strict adherence to the safety rules in this manual will reduce the possibility of injury to personnel and damage to the machine Develop personal safety awareness Observe all safety regulations and be alert for hazardous conditions Discuss these conditions with your supervisor Use the personal protective equipment specified by you...

Page 38: ...hands are wet Never activate electrical circuits while standing on a wet surface Be sure the main air line is securely attached to the air supply system inlet port Police the work area Remove any tools left on the machine Tools should be returned to their box after each use Tools or materials scattered around are a leading cause of damage injury Keep the machine clean The work areas around the mac...

Page 39: ... WARNING and or INSTRUCTION plates from the machine During service it may be necessary to remove or open some guards If so use great caution around exposed mechanisms Make sure all guards are returned and in place when set up work is completed Do not allow the bridge carriage or rail to impact the end stops with a high amount of force at the ends of the measuring range Bring the machine to a gentl...

Page 40: ...n you click a mouse button to initiate some action involving the item An action is initiated by releasing not pressing the mouse button on that item Each button performs differentfunctions Button 1 For right handed mice Button 1 is the leftmost button This button is used to select button icons on the screen Button 2 For right handed mice Button 2 is the center button On MH3D this button is not use...

Page 41: ...op of the button to move the cursor up bottom of the button to move the cursor down etc The speed of the cursor is determined by how hard the button is pressed The cursor stops moving when pressure is removed from the cursor movement button The Select button is used to activateiconshighlighted by the cursor The Scan Abort button is used to initiate scanning witha hard probe and as an Abort Escape ...

Page 42: ...nt and not subject to drastic changes The air supply should also be relatively free of contaminants NOTE The maximum air pressure is 8 3 Bar 120 psi The air supply is connected and the regulator is factory set to the correct pressure The pressure gage displays 3 7 BAR 55 1 psi The pressure has been preset at the factory If the pressure is not correct unlock the knob at the bottom of the regulator ...

Page 43: ...g Plug the power cord for the power supply into an outlet that agrees with the specifications in the Installation Manual Power up the machine For the MH3D controller push the front panel rocker switch located on the front left edge of the MH3D control box Start your measurement software ...

Page 44: ...xis The Z rail counterbalance system equalizes the weight of the rail so that it moves easily up and down The regulator that controls the counterbalance is located at the right side of the ZX carriage It must be adjusted to compensate for varying probe weights If the counterbalance pressure is adjusted too low it will trigger the safety valve causing the Z axis bearings to deflate and lock CAUTION...

Page 45: ... sphere has been located it should not be moved Refer to the Getting Started Manual for instructions for locating the reference sphere Reattach the probe to the probe holder Adjust the Z Axis counterbal ance for your probe It should be adjusted so the Z rail does not rise or fall when the probe holder is not being held Qualify your first tip Verify that the offsets and home position are correct by...

Page 46: ...lose to the operator as possible If table clamps are used try to locate the workpiece conveniently with respect to the M10 threaded table inserts CAUTION Do not overtighten clamp bolts or the threaded table inserts may pull loose from the granite table The maximum allowable torque on the bolts is 15 ft lbs Clamping is a very important aspect of planning a measuring strategy yet it is often overloo...

Page 47: ...he required tip and install it onto the probe head sensing shaft securing the tip with the stylus tool provided Refer to the probe manufacturer s documentation for stylus installation instructions 3 Insert the probe head mounting shaft into the Z rail until it engages the detent 4 Rotate the probe head until the red light indicator faces the front of the machine 5 Hold the probe in this position a...

Page 48: ... Z rail and gently make contact with the surface of the part with the ball probe Be sure there are no vibrations or bouncing and that the probe has come completely to rest against the part To measure a point with a hard ball probe bring the probe into contact with the part surface and press the Scan left button on the ZMouse or the right hand button on the desk mouse The measurement software conti...

Page 49: ...tor determines The direction of probe radius compensation during measurement calculations A plane s vector direction Which bonus tolerance calculation to use when true position tolerancing circular features Taking Points With a Hard Probe Against a Planar Surface Taking Points With a Hard Probe on a Round Surface The approach of the probe to the first point should be as perpendicular to the planar...

Page 50: ...e travel error and the more residual error is left after probe qualification Also longer probes tend to be not as stiff as shorter probes The more a stylus bends or deflects the lower the accuracy Therefore probing with very long stylus extension combinations should be avoided Probe hits also known as points should be taken perpendicular to the part surface wherever possible If hits are not taken ...

Page 51: ...ither perpen dicular nor parallel to the probe body give results that are less repeatable as those taken parallel to the probe body Probe hits taken parallel to the stylus axis but at an angle to the probe body are not repeatable and should be avoided if possible Probe configurations causing triggering forces which are neither parallel nor perpendicular to the probe body should be avoided Highest ...

Page 52: ...against the feature Generally the larger the ball the greater the EWL Using a larger stylus ball also reduces the effect of surface finish of the component being inspected however the largest ball which can be used is limited by the smallest hole to be measured Effective Working Length EWL Ball Stem Clearance The probe should be treated as a precision measuring instrument Keep it free of dirt and ...

Page 55: ...Y rail plane surface Be sure the direction vector is correct when contouring with a hard probe or when checking a complex surface contour Use a perpendicular approach vector whenever possible Make your measurements perpendicular to a surface when contouring with a Touch Trigger Probe The machine should be level to the floor and the granite level to the machine without anything on the granite When ...

Page 59: ...of long machine life production efficiency and operator safety Failure to do so may lead to unsafe operating conditions and will invalidate warranty agreements Never remove the Warning and or the Instruction plates from the machine Never wire fasten or override any interlock overload disconnect or other safety device to void its assigned function These devices are provided to protect the machine o...

Page 60: ...hat could occur when a welder or large motor is applied to the line can adversely affect machine operation and must be avoided Never touch electrical equipment when hands are wet Never activate electrical circuits while standing on a wet surface Solid state control circuits require proper grounding and shielding Ensure that all shields are properly connected after repairs Any unauthorized addition...

Page 61: ...er day and forty hours per week of machine operation If the machine is operated on longer or extra shifts or for more than five days per week the maintenance schedule must be adjusted as follows Daily or every 8 hours of operation Monthly or every 165 hours of operation Three months or every 500 hours of operation For example if a machine is operated for two eight hour shifts per day the monthly m...

Page 62: ...drain the filter as required always wear safety glasses The air supply must be on If a buildup is constantly found installa tion of additional filtering or an air drying system may be required 3 Check the cable and cable connections for the Z axis counterbalance 4 Check electronic probes and cables 5 Check measuring scales 6 Check air system 1 Visually check the electronics for dirt oil or water a...

Page 63: ...ilter Check air supply Check machine functions Check regulator pressure Inspect machine for loose worn or damaged parts Check air filters Check Z axis counterbalance cable Check electronic probes and cables Check measuring scales Check air system Check that the machine is level Check air system lines Check all machine functions Check electronics Check cable connections Daily Monthly Three Months ...

Page 64: ...lter clogged Is the regulator set for the correct pressure Is the counterbalance regulator adjusted correctly Are any air lines broken Broken air lines are indicated by excessive air escaping Are the rails dirty Are the axis loop cables too tight or positioned wrong Is an air hose dragging on one of the rails Machine X or Y axes drift Is the machine level Place a level on top of the X and Y rails ...

Page 65: ... selected XY YZ ZX Inaccurate measurements Is the part dirty or oily Is the surface finish on the part poor Using a larger diameter stylus ball will reduce the effect of surface finish of the part being inspected Was the homing initialization procedure followed correctly Is an unqualified tip being used Has the tip been moved after qualification Has the qualification sphere been moved since the fi...

Page 66: ...ne is set to 55 psi If the machine air pressure is set to 55 psi consult TESA for help Oil appears from under the air bearings Clean the rails as described in Cleaning the Bearing Surfaces Check the machine s air filters and replace the cartridge if necessary If oil appears frequently the air supply may be particularly poor It may be advisable to add a larger coalescing filter to the air supply up...

Page 67: ...i static cloth that is moderately wetted with pure alcohol Use only Isopropyl Alcohol Allow the alcohol to dry NOTE Do not use any other type of cleaning fluid Unlock the axes and move the bridge to the other end of its travel Lock the machine axes Clean the exposed part of the scale It is important that all residue be removed from the scale Check all surfaces for smudges and reclean as required C...

Page 68: ...element and replace bowl and shield The coalescing filter element may be washed in safety solvent and then dried and reused once or twice and then replaced Air filters should be washed or replaced at intervals of 6 months if the air line is dirty The coalescing filter has an O ring on its upper surface Be sure the O ring is seated properly in the groove before reinstalling If the filter gets dirty...

Page 71: ...n the bearing pad and the axis way surface creating a film of air which permits movement of the machine s members with almost no friction Alignment The procedure of relating the XYZ coordinates of a part to the coordinates of the machine compensating for the fact that the part is not perfectly square to the machine s table It shows the CMM where the workpiece lies Angle The degree of difference be...

Page 72: ...Distance The distance the probe backs off the part after a touch Backup Copy A duplicate of a part program Ball Bar A three dimensional gage consisting of two precision balls of the same diameter separated by a bar and used for determining volumetric accuracy The bar must be sufficiently rigid that its length is constant during a set of measurements Ball Bar Socketed A ball bar held by a socket wh...

Page 73: ...n space in terms of X Coordinates Y and Z axes The axes are perpendicular to each other The points are expressed in relation to some fixed origin zero point Cartesian Coordinate A measuring system that uses three independent Measuring System mutually perpendicular axes to form a grid The coordinates of a point are measured as distances from each of these axes Centroid The weighted center of all po...

Page 74: ...o define a cone Contact Probes Probes which must touch the part in order to make a measurement They can be either rigid or electronic Contact Velocity The speed of the probe as it actually takes a measure ment and touches the part Coordinate The X Y and Z values that identify the location of a point in space Coordinate System A method of locating a point in space by assigning it a value according ...

Page 75: ...established Datum Reference The perpendicular intersection of the primary secondary Frame and tertiary datum planes Default The preset value that a computer will assign to a variable if the operator does not enter a value Deviation The difference between the actual measured dimension and the nominal dimension Deviation is positive if the actual dimension is larger than the nominal Deviation is neg...

Page 76: ...mputer correction of local errors with the measuring envelope of a Coordinate Measuring Machine It re quires a stiff stable mechanical structure E Stop Emergency stop A button that will immediately stop all systems Execute The process of executing previously learned moves and measurements on the CMM To run a part program Feature A feature is the same as a measurement or alignment routine name A fe...

Page 77: ...frictionless bearings Gage A mechanical artifact used either for checking a part or for checking the accuracy of a machine A measuring device with a proportional range and some form of indicator either analog or digital Geometric The use of geometric shapes to define part features Dimensioning Geometric Elements Seven shapes used to define a part and its features The shapes are point line plane ci...

Page 78: ...vectors Input The information entered into a computer system Inspect To manually check a part not using the DCC mode of the machine A mode where the operator uses all mea surement capabilities yet does not save the steps to a part file Intersection The creation of new geometric elements when two existing geometric elements cross each other Joystick A lever on the joystick box used to control the m...

Page 79: ...lacement The difference between the true displacement of the Acuracy probe along a straight line and that indicated by the machine measuring system List To display a part program on the CRT LLF The learned list file or the part program Lobing A systematic error in the measuring accuracy of probing systems such that a measured value depends on the displacement direction of the probe tip Login The p...

Page 80: ...an Gage The mean temperature of a gage used for machine Temperature testing It should be computed from at least two readings taken on the gage during the interval of the test Mean Scale The mean temperature of a machine scale computed Temperature from at least two temperature readings taken on the scale during the test interval Mean Temperature The average temperature computed from a number of tem...

Page 81: ... to the Major axis Minor Radius The smallest possible distance between the outermost edge of an ellipse and its center Minus Tolerance The negative amount that an actual measurement can deviate from its nominal value MMC Maximum Material Condition The condition of a feature in which that feature contains the maximum amount of material that is allowed by the toleranced dimensions i e the smallest h...

Page 82: ...axis that forms a 90 degree angle with a datum plane or axis Normal Vector The vector that is normal to the surface of the part at a particular point The negative of the Approach vector Numeric Variable A value which contains only numbers Off line The condition in which a device such as a printer is not connected to or communicating with the computer OIT Operator Interface Terminal On line A metho...

Page 83: ...t with respect to a known reference Part Program A list of coded instructions that tells the system how to measure a part on a CMM Part Program A storage area that holds part programs Directory Part Program Name A label assigned to a part program It is saved retrieved and reused by means of this name Part Reference The axes alignment datum position and working plane Frame under which measurements ...

Page 84: ...ane The surface of a part defined by at least three points It is always straight in two directions Plus Tolerance The positive amount that a measurement can deviate from the nominal value Point A measurement routine consisting of one element CMM input which yields an X Y Z location A point is the simplest geometric element Point Distance A measurement routine used to compute the straight line dist...

Page 85: ...e and the inspection surface Probe On a CMM the component that touches and measures the part Probe Approach The distance to the part at which the machine traverse Distance speed is reduced to the probe approach rate for measure ment Probe Body The cylindrical part of a probe into which the stylus is mounted Probe Diameter The diameter of the probe tip whose value radius is used to compensate for m...

Page 86: ...ed on a post that can be fastened to the machine s table Used to qualify the machine and the probes to be used Qualify To inform the computer of the location and size of the probe Ram The moving component of a machine that carries the probe Range The difference between the maximum and minimum values of a set of measurements Readout The display of X Y and Z coordinates Recall To retrieve informatio...

Page 87: ...obe The angular motion of a carriage designed for linear motion about the linear motion axis Rotate An alignment function used to rotate the part s coordi nate system about the origin the specified amount of degrees Roundness The condition of a circle as it exists within a tolerance zone formed by two concentric circles Also known as circularity A measurement routine which computes the deviation o...

Page 88: ...ty contact velocity acceleration retract distance and prehit distance that are programmed into the system Significant Mean The change in mean ambient temperature surrounding a Temperature Change CMM that in the manufacturer s judgment will cause sufficient degradation in machine performance to require the performance evaluation to be repeated Single Tip A qualification procedure for a single tippe...

Page 89: ...s The portion of a probe that contacts the part Usually a synthetic ruby ball mounted on a steel shank Symmetry The midpoint between two features A symmetry feature is the mathematical bisector of two features Systematic Error That portion of a machine error that results from com puting the mean of a very large number of similar measurements Taper Probe A type of rigid probe used primarily for hol...

Page 90: ...peed The speed of the tip of the ram of a CMM measured with respect to the part mounting surface when the machine is moved between nominal locations without measuring True Position The exact location of a point line or plane with respect to a datum or other feature True Position MMC Allows for an increase in positional tolerance as the size of the feature changes True Position RFS Refers to the fe...

Page 91: ... measurement results X Axis The axis of a CMM that goes from left to right as you stand in front of the machine Positive direction is to the right One of the reference lines or axes in a Cartesian coordinate system Y Axis The axis of a CMM that goes from front to rear Positive direction is to the rear One of the reference lines or axes in a Cartesian coordinate system Yaw Side to side deviation fr...

Page 95: ...he rail is firmly held 3 If necessary set the counterbalance pressure by holding the probe and unlocking the Z rail and then adjusting the counterbalance regulator 4 To measure tall parts it may be necessary to invert the mounting bracket 4 as shown The support must be securely tightened 5 Attach the cable support bracket 5 to the middle of the black cable tray behind the X rail 6 Tie the the vide...

Page 98: ...ruction Manual for the procedure on parfocality adjustment Crosshairgenerator The crosshair generator provides two pairs of reference lines on the monitor screen two vertical and two horizontal The location can be electronically controlled The lines can be made black or white solid or dashed The ideal placement of the reference crosshair is in the middle of the screen Note Never change the locatio...

Page 99: ...r position CrosshairAlignment It is recommended that the crosshairs on the monitor screen be aligned to the X axis and Y axis of the MH3D To align the crosshairs 1 Lock the Y axis 2 Using a sharp pencil draw a line on the surface of the granite by holding the pencil tight to the Z rail and moving the ZX carriage along the X axis 3 Using the lowest magnification focus the probe on the pencil mark o...

Page 100: ...is and the Y axis of the MH3D 8 Focus the probe on the equatorial plane of the qualification sphere using thelowestmagnification 9 Take three measurement points equally spaced on the circumference refer to the following section on measuring with the optical probe 10 Focus the probe on the top point of the sphere and bring this point to the origin of the reference crosshair on the monitor screen 11...

Page 101: ...s an edge probe You must tell the MH3D software when to record the coordinates of the selected point on the part surface This is done by pressing the right hand button on the desk mouse The principles of referencing part features with the optical probe are similar to those for projectors and measuring microscopes 1 Manually position the probe so that the edge to be measured is in sharp focus on th...

Page 102: ...ot use the Change Feature Type softkey to solve for a plane 3 Focus on the bottom plane of the feature and take a single measurement point Press Done 4 Select the Relationship Mode softkey to view the Perpendicular Distance screen or 1 From the Main Menu select Height Gage 2 Select the Z Axis softkey 3 Focus the probe on the top plane of the feature and take a single measure ment point Press Done ...

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