LittleMachineShop.com HiTorque 7500 User Manual Download

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The premier source of tooling, parts, and accessories for bench top machinists.

HiTorque 8½×20 Bench Lathe User’s Guide

Model 7500

•

Model 7550 Deluxe

from LittleMachineShop.com

Summary of Contents for HiTorque 7500

Page 1: ...The premier source of tooling parts and accessories for bench top machinists HiTorque 8 20 Bench Lathe User s Guide Model 7500 Model 7550 Deluxe from LittleMachineShop com...

Page 2: ...com All rights reserved Written by Chris Wood of LittleMachineShop com Revision 3 October 2022 LittleMachineShop com https www littlemachineshop com 396 W Washington Blvd 500 Pasadena CA 91103 info l...

Page 3: ...ut 19 Apron Position 19 Tailstock Position 20 Half Nuts 21 Drive Belt 21 Maintenance 22 Cleaning 22 Lubrication 22 Chuck 23 Changing Chuck Jaws 23 Mounting Work in a 3 Jaw Chuck 24 Tool Bits 24 Grindi...

Page 4: ...ound rest Part number 5513 Android tablet display Part number 5880 Digital position readout tailstock Part number 2280 Quick change tool post set AXA Part number 4914 Compound rest top required for AX...

Page 5: ...re the machine is in a safe condition before o Opening or removing safety shields o Reaching into work area o Changing or adjusting tools o Changing or adjusting work pieces o Changing speed ranges o...

Page 6: ...that your machines are well lit Ensure that your shop is well lit and have additional task lighting where appropriate Maintain a clean and uncluttered work area Avoid pinch points Never leave a runnin...

Page 7: ...e 9 2 Headstock 3 Chuck 4 Carriage 5 Cross slide 6 Tool post 7 Compound rest 8 Tailstock for details see Tailstock Controls on page 13 9 Change gear cover 10 Bed ways 11 Apron for details see Carriage...

Page 8: ...se to protect it from corrosion during shipment Follow this procedure to remove the grease 1 Wipe most of the grease off with rags or paper towels 2 Clean the surfaces with mineral spirits paint thinn...

Page 9: ...install the two bolts on the back of the headstock If you have the chip tray its mounting dimensions are shown below Lathe Controls Become familiar with the controls used to operate the lathe before...

Page 10: ...ws The motor will make a controlled change of direction Speed Control Knob The speed control knob adjusts the spindle speed Spindle Speed Readout The spindle speed readout shows the speed of the spind...

Page 11: ...e you are turning Pull the hand wheel towards you to disengage it when you are using power feed Carriage Lock Screw Use a 4 mm hex wrench to tighten the carriage lock screw when you want to prevent th...

Page 12: ...d inches Chris Tip These digital readouts do not account for backlash in the feed screw Always take your readings when you are turning the screw in the same direction This is not a problem on a lathe...

Page 13: ...e power feed when the half nuts are engaged There s an interlock but you can break it if you try You ll find it easier to engage or disengage the power feed while the lathe is running If you do attemp...

Page 14: ...and swipe up to unlock it 4 Open Settings If you don t see a Settings icon near the center of the screen open the app drawer the middle icon of the quick launch bar on the bottom or right edge of the...

Page 15: ...s readouts appear at the left top of the screen The buttons across the bottom affect all axes The abs incr button to the right of each axis readout affects only that axis The right side of the screen...

Page 16: ...roove that exists on your work piece You can for example set an incremental 0 position at one edge of the groove and then use incremental values to machine the groove Points and workspaces Points are...

Page 17: ...tools To select a tool To choose a tool and use the predefined offset simply tap the tool in the list of predefined tools Tap Tools on the right side of the screen to see the list The Tool Offset win...

Page 18: ...n position 5 Loosen each cap screw about 1 8 turn to allow carriage to move but without play 6 Snug the set screws to lock the cap screws in position Do not over tighten 7 While holding the set screws...

Page 19: ...he compound rest also incorporates a gib for adjustment To adjust the compound rest gib 1 Loosen the four lock nuts on the side of the compound rest 2 Slightly loosen all four set screws on the side o...

Page 20: ...the left side of the carriage and two on the right side of the carriage 2 Engage the half nuts on the lead screw 3 Tighten the four socket head cap screws Tailstock Position The tailstock is adjustabl...

Page 21: ...ughly perpendicular to the axis of the lathe the width of the rule should be vertical Bring the centers together to hold the rule in place 10 Adjust the upper part of the tailstock casting until the s...

Page 22: ...brication Chris Tip Mobil Vactra Oil No 2 is available from LittleMachineShop com part number 4120 If you prefer to purchase locally get Mobil 1 synthetic motor oil any viscosity available at most aut...

Page 23: ...s at least monthly Change gear B C shaft and bushing Oil Monthly Oil the B C shaft and bushing every time you change gears and at least monthly Tailstock quill and screw Grease Yearly The spindle bear...

Page 24: ...e jaw lathe chucks are good for most lathe operations All three jaws move together as you turn the chuck key But because of the way they are made 3 jaw chucks have limited accuracy They will center wo...

Page 25: ...ack rake produces the front cutting edge that cuts into the work piece Front relief Front relieve provides clearance for the front cutting edge Without front relief the front of the tool bit would hit...

Page 26: ...mall nose radius allows you to turn into tight corners A large nose radius produces better surface finishes Create a nose radius that is appropriate for the tool bit you are creating Adjusting Tool Bi...

Page 27: ...feed handle slowly advance the tool bit into the work until it just touches the surface of the work piece 6 Move the carriage to the right so that the tool bit is past the end of the work piece 7 Usin...

Page 28: ...tool so that the side cutting edge forms an acute angle with the face of the work piece 3 Move the carriage to the right so that the tool bit is past the right end of the work piece 4 Ensure that the...

Page 29: ...h left and then up on the power feed lever until the power feed engages As the tool bit meets the work piece it starts cutting 9 When the cross slide has moved as far as you want lower the power feed...

Page 30: ...sition B is the inside gear on this shaft C Gear positions B and C are on the same shaft between positions A and D Position C is the outside gear on this shaft D Position D is the end of the lead scre...

Page 31: ...gear so the gear will align with the gear in position B In the change gear tables some combinations have Any in column C For these combinations you can use any gear for position C this gear acts only...

Page 32: ...0 127 48 56 100 60 127 50 49 120 56 90 56 49 90 50 120 64 56 100 45 127 72 56 100 40 127 80 35 90 49 120 100 35 127 40 87 Inch Threads Left Hand TPI A B C D 5 60 30 127 100 6 50 100 127 30 7 50 100 12...

Page 33: ...100 60 120 0 5 30 80 Any 120 0 6 30 100 Any 100 0 7 50 100 70 100 0 75 45 80 Any 120 0 8 50 100 80 100 1 50 80 Any 100 1 25 50 100 Any 80 1 5 45 100 Any 60 1 75 49 120 Any 56 2 50 120 Any 50 2 5 50 12...

Page 34: ...sult from cutting the entire V form of the thread at once Chris Tip Use an accurate protractor when setting the compound rest The scale on the lathe is not accurate enough Setting the Cutting Tool Eve...

Page 35: ...e carriage to the beginning of the cut 2 Advance the cross slide to the initial position For the first pass you are already there For additional passes advance it 2 complete turns to the 0 mark 3 Adva...

Page 36: ...with no adjustment necessary LittleMachineShop com part number 4101 This is a very high quality quick change tool post for the HiTorque Bench Lathe It holds tools up to 3 8 shank The set includes Too...

Page 37: ...Each jaw is independently adjustable and reversible This set includes a chuck key and reversible jaws The through bore of this chuck is 0 98 The chuck can hold work up to 100 mm 3 94 in diameter Litt...

Page 38: ...and supports work being turned between two centers The live center is LittleMachineShop com part number 1592 It has a 2 Morse taper shank This center fits the tailstock of the bench lathe The dead ce...

Page 39: ...39 The steady rest is LittleMachineShop com part number 3398 The steady rest can support work up to 2 2 in diameter The follower rest is LittleMachineShop com part number 3399...

Page 40: ...40 Parts Diagram 7500 Model 7500 drawing 1...

Page 41: ...41 Model 7500 drawing 2...

Page 42: ...42 Parts Diagram 7550 Model 7550 drawing 1...

Page 43: ...43 Model 7550 drawing 2...

Page 44: ...71 Spacer 4852 72 Bolt 4494 73 Gear 120T 4938 74 Copper cover 5204 75 Washer 5799 77 Lead screw protection cover 5261 78 Cap screw M4 10 1529 79 Rack 5266 80 Washer M8 1586 82 Nut 81 Cap screw M8 35 4...

Page 45: ...243 Tool post mount 4395 244 Handle 4396 245 Set screw M3 16 7500 4485 245 Set screw M4 16 7550 5808 246 Feed screw support 5291 247 Graduated scale 5292 248A Handle 4410 250A Feed screw 4411 251 Cap...

Page 46: ...673 411 Screw M3 25 1496 412 Key 3 8 mm 1357 413 Bushing 4173 414 Set screw M3 4 4174 415 Shaft 4175 416 Handwheel 4176 421 Handwheel 4176 422 Retainer 4177 424 Screw M3 8 4166 425 Screw M3 14 4178 42...

Page 47: ...47 Wiring Diagram...

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LittleMachineShop.com HiTorque 7500, User Manual

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