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Fona MyCrown Mill, Service Manual

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Fona MyCrown Mill Service Manual Download Page 26

 

26

MyCrown Mill

2.3.8

DC motors 'Touch'

Purpose of Test:

This test is used to check the two DC motors for proper functioning in the 

Low-speed mode.

Procedure

The DC motors are tested by adjusting them to the touch speed (in the 

relevant directions of rotation). Then the relevant data are determined.

DC motors 'Touch'

The possible motors can be selected either together or separately.
If no motor is selected, the 

"Start" 

 button is not active. Default: Both 

motors selected.

1

Measure of speed fluctuation

2

Pulse-width modulation

NOTICE 

Different bearing friction
If the red fields in the service software drift from one side to the other 

(e.g. from right to left) in the 

"DC motors 'Touch'" 

 test after a spindle 

motor is replaced, this may be attributable to different levels of bearing 

friction in the two spindle motors. In this case, follow the procedure 

described below:
➢ Start the 

"Continuous load" 

 and let the spindle motors warm up for 

approx. 15 min.

➢ Mill 1-2 restorations.

Summary of Contents for MyCrown Mill

Page 1: ...j j p j b Service Manual...

Page 2: ...2 3 7 DC motors Load Run in 25 2 3 8 DC motors Touch 26 2 3 9 DC motors Speed 27 2 3 10 Force sensors stepping motors Rigidity 28 2 3 11 Continuous load 29 2 3 12 Milling Unit Info 30 3 Troubleshootin...

Page 3: ...3 Linear stepping motor 70 4 5 3 1 Removing the stepping motor 70 4 5 3 2 Installing the stepping motor 74 4 6 Replacing the milling machine 77 4 6 1 Removing the milling machine 77 4 6 2 Installing t...

Page 4: ...mp 91 4 14 Replacing the display 92 4 15 Adjusting the plunger pin 93 4 15 1 G axis and M axis plunger pin 93 4 16 Replacing the set screw 94 4 17 Replace the distributor board for the milling motors...

Page 5: ...5 Service Manual b 1 General information C o n t e n t s 1 1 General information 6 1 2 Additional information 7...

Page 6: ...using a wrist band Measurements Always switch off the device before connecting the measuring instrument Select the correct current voltage type and adjust the measuring range to match the expected re...

Page 7: ...nt operating instructions 1 2 Additional information In addition you also require Wiring diagrams MyCrown Mill Order No 66 18 974 Operating Instructions MyCrown Mill Order No 66 11 748 Tools Allen key...

Page 8: ...ring tool for repairing cables Side cutting pliers Cable ties Teflon tape Loctite 221 Calibration set supplied with unit Step Bur 12 SandCyl Pointed Bur 12 S Torque wrench for changing the milling ins...

Page 9: ...ia supply 18 2 3 2 1 Media supply 18 2 3 3 Light Barriers Door Switch Temperature Sensor and Motor Stop Positions 19 2 3 4 Stepping motor test 22 2 3 5 Stepping motors Single step 23 2 3 6 Stepping mo...

Page 10: ...oftware generates a log file for all tests performed This log file is located in the folder on delivery C Program Files FONA Dental MyCrown Design 1 0 x Bin Service Service Protocols The protocol is c...

Page 11: ...ed Passed uncritical changes have occurred Not passed If the test results are scored Not passed you must find and eliminate the cause NOTICE Keep the cover closed If the milling unit housing is left o...

Page 12: ...used only by authorized service engineers who have been trained by FONA Dental Password number Generated from 1 2 number of the current month 2 1 number of the current month 3 2 number of the current...

Page 13: ...you want to delete this file If you click on the Yes button The old file is deleted and a new log file is created If you click on the No button The old file is not deleted and the details of the new...

Page 14: ...st selection dialog box In the Test selection dialog you can select a test for the entire milling unit Total test or select an individual test Through confirmation with the OK button the corresponding...

Page 15: ...15 Service Manual b Example Total test Total test...

Page 16: ...ble during the test run G With the Stop button the test is broken off as quickly as possible The test in progress at the time of cancellation is not counted All inputs are now possible again H Store t...

Page 17: ...c Infrastructure The transmission time between the beginning of transmission and the end of reception is calculated for a specific record on the PC A test run comprises one complete transmission in bo...

Page 18: ...pressure switches are registered The points of time when the pressure detectors respond are measured After approx 5 seconds the pumps are switched off and the time required until the pressure switch...

Page 19: ...he slot of the gear is measured via the width and height at which the stepping motor positions are registered with the flanks The light barriers to be tested can be selected in all variations If no li...

Page 20: ...attern is shown on the display as a display test The Illumination button tests all colors of the milling chamber illumination white milling default color blue not assigned to any function green operat...

Page 21: ...ition and stop there The motors can be reset to their home positions by pressing the Home button Switches Adjustment NOTICE Open block Close block Place a block in the block axle to test the Open bloc...

Page 22: ...stepping motors are run at various speed settings and evaluated via an acceleration table Display of test results In order to satisfy different requirements for adjustment and testing purposes this te...

Page 23: ...he individual motors in the longitudinal and rotary directions Under the option Longitudinal axis tolerance control the Grind Block and Mill axles can be extended by a permanently set value This speci...

Page 24: ...amping behavior of the stepping motors Stepping motor Step response Procedure A test cycle is run following each start If no motor is selected the START button is not active Step response BR motor can...

Page 25: ...tors Load Run in The two motors left motor right motor can be selected together or separately The speed range of the DC motor can be tested selectively via the adjustable motor current If no motor is...

Page 26: ...If no motor is selected the Start button is not active Default Both motors selected 1 Measure of speed fluctuation 2 Pulse width modulation NOTICE Different bearing friction If the red fields in the s...

Page 27: ...roper functioning in the High speed mode DC motors Speed Procedure The DC motors are tested by accelerating them from a standing start to operating speed and then measuring the relevant data e g speed...

Page 28: ...together or separately The calibration phantom is now clamped The calibration pins are now ready for use The Automatic option button is selected Start the test If no motor is selected the START button...

Page 29: ...anual b 2 3 11 Continuous load Purpose of Test This test serves to simulate a maximum load for the power supply and intentionally heat up the entire system All loads can be operated simultaneously Con...

Page 30: ...nd grinder Milling Unit Info Value names Explanation of value SerialNumber Serial number of milling unit MachineType Machine type 83 MyCrown Mill HW_configuration Hardware configuration 40 Water Time...

Page 31: ...s anatomic bridges frameworks abutments test pieces and drilling templates CrownCounter VeneerCounter CopingCounter BridgeCounter FrameWorkCounter AbutmentCounter SampleCounter Drilling templates Unit...

Page 32: ...ripes in restoration 39 3 7 Insufficient air pressure 41 3 8 Stepping motor cannot be controlled 42 3 9 Faulty water pressure 43 3 10 Unit cannot find starting position 45 3 11 Unit cannot be turned o...

Page 33: ...33 Service Manual b 3 1 Force measurement errors...

Page 34: ...34 MyCrown Mill 3 2 Stepping motor does not move...

Page 35: ...35 Service Manual b 3 3 Spindle motor does not lock...

Page 36: ...36 MyCrown Mill 3 4 Milling chamber door switch...

Page 37: ...37 Service Manual b 3 5 Unit switches off Continued on next page...

Page 38: ...38 MyCrown Mill Continued from previous page...

Page 39: ...39 Service Manual b 3 6 Edges break off holes or wide stripes in restoration Continued on next page...

Page 40: ...40 MyCrown Mill Continued from previous page...

Page 41: ...41 Service Manual b 3 7 Insufficient air pressure...

Page 42: ...42 MyCrown Mill 3 8 Stepping motor cannot be controlled...

Page 43: ...43 Service Manual b 3 9 Faulty water pressure...

Page 44: ...44 MyCrown Mill Continued from previous page...

Page 45: ...45 Service Manual b 3 10 Unit cannot find starting position...

Page 46: ...46 MyCrown Mill 3 11 Unit cannot be turned on...

Page 47: ...47 Service Manual b 3 12 Touch errors...

Page 48: ...48 MyCrown Mill 3 13 Service life of the milling and grinding machine is too short...

Page 49: ...49 Service Manual b 3 14 Milling unit not addressable...

Page 50: ...50 MyCrown Mill 3 15 LAN communication problems Continued on next page...

Page 51: ...51 Service Manual b Continued from previous page...

Page 52: ...52 MyCrown Mill 3 16 WLAN connection occasionally interrupted...

Page 53: ...53 Service Manual b 3 17 WLAN communication problems...

Page 54: ...ne 77 4 6 1 Removing the milling machine 77 4 6 2 Installing the milling machine 79 4 7 Replacing the tank switch if present 81 4 7 1 Preparations 81 4 7 2 Removing the chassis insert 81 4 7 3 Install...

Page 55: ...55 Service Manual b 4 15 Adjusting the plunger pin 93 4 15 1 G axis and M axis plunger pin 93 4 16 Replacing the set screw 94 4 17 Replace the distributor board for the milling motors 95...

Page 56: ...rs NOTICE All of the device s covers must always be in place during processing A Cover rear panel F Cover front B Intermediate cover G Cover right drawer C Cover left H Drawer insert right D Drawer in...

Page 57: ...push the cover upward until it snaps into place NOTICE Lead with connector X15 on cover right When removing Remove right cover I carefully and detach connector X15 Y Y NOTICE Lead with connector X15...

Page 58: ...Remove the fastening screws of the shaft 3 Pull the motor mount together with the motor off of the shaft and the mount cover At the same time unplug the power supply connectors Removing the motor 1 Re...

Page 59: ...and the water connector blue and replace them with new ones 4 2 1 2 Installation NOTICE O rings Use the O rings supplied with the unit NOTICE Do not damage the cables When removing the mount cover be...

Page 60: ...ere a new gasket to the mount cover 2 Replace the O ring in the motor mount A Apply a small amount of lubricant to the O ring prior to installation and make sure that it does not slip 3 Fold the cable...

Page 61: ...t cover onto the shaft as far as it will go 2 Push the motor along with the motor mount onto the shaft 3 Connect the power supply connectors A Motor O ring D Power supply cable B Spindle motor E Hole...

Page 62: ...ustments have to be performed Testing spindle motor s with service software 1 Perform the Media supply test Air noticeably escapes from each spindle motor 2 Perform the DC motors Load inlet test The m...

Page 63: ...and measure it The length of the edge must be between 4 90 mm and 5 03 mm The difference between the edge lengths must be less than 0 05 mm the height of the pyramid must be between 5 20 and 5 35 mm...

Page 64: ...board Replacing the microcontroller module 1 Pull off the defective microcontroller module 2 Plug the new microcontroller module into the controller board 3 After installing the controller board perf...

Page 65: ...picture of the desired device 5 Note the device name and IP address of the milling unit where you replaced the microcontroller module 6 Click on the Delete Device button 7 Switch the milling unit on 8...

Page 66: ...Use a small screwdriver to pry out the milling chamber lighting PC board on both sides 6 Pull off connector X1 7 Plug connector X1 into the new PC board 8 Insert the new PC board on both sides until i...

Page 67: ...67 Service Manual b 4 5 Replacing stepping motors Overview of stepping motors...

Page 68: ...stepping motor with the toothed roller downwards Installing the stepping motor 1 Turn the gear wheels so that the previously marked teeth are aligned and push the stepping motor with the toothed roll...

Page 69: ...motor TX 10 3 Pull out the stepping motor with the toothed roller Installing the stepping motor 1 Turn the gear wheels so that the previously marked teeth are aligned and push the stepping motor with...

Page 70: ...aring the right left stepping motor Preparing the unit 1 Switch the milling unit on 2 Remove the block and instruments 3 Start the Service software 4 In the Test selection window select the Stepping m...

Page 71: ...h the milling unit on 2 Remove the block and instruments 3 Start the Service software 4 In the Test selection window select the Stepping motors single step function 5 For Steps select the 100value 6 C...

Page 72: ...ss the block stepping motor 4 Unscrew and remove the screws from the lower flap and take off the flap NOTICE If the motor is defective If you cannot move the motor using the service software you will...

Page 73: ...rd A as of X3 2 Unplug the encoder cable from the stepping motor B 3 Remove the four screws from the stepping motor C 4 Loosen the two screws from the clamping flange E 5 Remove the motor by pulling i...

Page 74: ...g flange is locked in the mounting fixture 3 Push the spindle above the gear wheel outwards and position the motor flush against the mounting fixture 4 Press the motor against the housing and screw th...

Page 75: ...5 3 2 3 Fastening the stepping motor 1 Loosely attach the screws 2 Attach the power cable and the encoder cable 3 Attach the protecting cover using two screws 4 Start the service software 5 In the Tes...

Page 76: ...Red Test not yet passed NOTICE Red or yellow fields during the test After the test all fields must be green If red or yellow fields are displayed repeat the test If red or yellow fields are still dis...

Page 77: ...Preparation and Removing the motor unit Milling machine 3 Detach connectors GX1 BX1 and MX1 from the respective distribution board 4 Disconnect reed contact connector X5 5 Detach connector X1 from the...

Page 78: ...e offset angled nipple for each of the 2 manifolds Then reattach the nipple holder to the manifold 10 Unscrew the 4 fastening screws from the milling machine with a 6 mm Allen key 11 Carefully lift ou...

Page 79: ...o screw ground conductor A tight at the rear right Inserting the manifolds 3 Detach the nipple holder from each of the 3 manifolds and insert the offset nipple with the same color in each of the hoses...

Page 80: ...ug connector X1 into the milling chamber lighting 7 Connect reed contact connector X5 8 Plug connectors GX1 BX1 and MX1 into the respective distribution board 9 Fasten the cables with cable ties 10 In...

Page 81: ...ll the water tank out 2 Unscrew the front cover 4 7 2 Removing the chassis insert 1 Unscrew the 4 screws on the rear side of the cooling pack TX 20 screwdriver 2 Take out the fan unit and the cooling...

Page 82: ...Crown Mill Taking out the chassis insert 4 Insert the hose toward the front and carefully pull the chassis insert forward until you can see the suction connection in space A Rotating the suction conne...

Page 83: ...Insert the rails toward the front and screw on the rear rubber metal mountings B Taking out the chassis insert 3 Push through the hose with the suction connection underneath the metal bracket and rot...

Page 84: ...Reattach all covers 4 8 Replacing the suction connection 4 8 1 Preparations 1 Pull the water tank out 2 Unscrew the front cover 4 8 2 Removing the chassis insert The removal of the chassis insert is...

Page 85: ...t 3 Reinsert the tank 4 Reattach all covers 4 9 Replacing the light barrier Light barrier B axis 1 Remove the rear panel cover and the intermediate cover 2 Unscrew the metal bracket 2 screws TX 20 scr...

Page 86: ...hose 4 Unscrew the air pump from the mount 3 screws TX10 Installation 1 Apply a light coat of Loctite 221 sealer to the threads of the 3 fastening screws for the air pump 2 Screw the air pump onto the...

Page 87: ...rs 4 11 Replacing the pressure switch 4 11 1 Water pressure switch 1 Remove all covers except for the right cover Water pressure switch 2 Pull the connector off of the pressure switch 3 Unscrew the pr...

Page 88: ...right cover Air pressure switch 2 Pull the connector off of the pressure switch 3 Unscrew the pressure switch 4 Seal the thread of the new pressure switch with teflon tape and screw it tight 5 Plug t...

Page 89: ...r the right cover Replacing the cooling unit 2 Unscrew the 4 screws on the rear side of the fan unit TX 20 screwdriver 3 Take out the fan unit and disconnect connector X8 4 Connect connector X8 of the...

Page 90: ...s described in the chapter Removing the milling machine 2 Disconnect power supply connector X10 3 Unscrew the air pump mount 3 screws TX20 Water pump 4 Unscrew the water pump 4 screws 7 mm torque wren...

Page 91: ...13 2 Attaching the water pump 1 Screw on the water pump with 4 screws 2 Screw on the air pump mount with 3 screws 3 Connect power supply connector X10 4 Reinstall the milling machine as described in...

Page 92: ...r the left cover 2 Pull off connector X15 3 Unscrew the defective display 4 Screw on the new display 5 Plug in connector X15 6 Reattach all covers NOTICE Display is deforming If you tighten the screws...

Page 93: ...ck the Adjustment button The motors move to the adjustment position of the plunger pin 5 Open the milling chamber door Plunger pin 6 Turn the DC motor manually in such a way that the plunger pin does...

Page 94: ...s into position 12 o clock position to insert the set screw A dialog box prompts you to replace the set screw and close the processing chamber door again 6 Remove the worn set screw using the block cl...

Page 95: ...ut and insert it into the same position on the new board Repeat for all connectors 3 Unscrew the screw A 4 Press the holding clips B together and remove the board 5 Slide the new distribution board ov...

Page 96: ...96 MyCrown Mill 5 Using the cleaning set C o n t e n t s 5 1 Cleaning the manual block clamp 97 5 2 Milling instruments without chuck 97...

Page 97: ...ng instrument 2 Clean the inside of the clamping cone with a pointed cotton swab and undiluted ethanol commercially available cleaning alcohol When doing this rotate the cotton swab counterclockwise i...

Page 98: ...FONA Dental s r o Stefanikova 7 SK 811 06 Bratislava Slovakia K K MQKOMNT 66 18 867 D 3439 076 04 01 j W p a p d e c PNI a J SQSOR _ I d K K...

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