Hardinge lathe maintenance and specifications

Shop Area: Metal Shop Tool: Hardinge Lathe

Procedure Number MT 130-12, Rev. 1

Date 3/7/2021

General

Hardinge HLV-EM, 11x24, manual metal lathe.

digital readout with 0.005mm linear scales

Reference

• Hardinge HLV Maintenance Manual
• Parts manual (https://vector-space.org/sites/default/files/Hardinge_HLV_Parts_manual.pdf)
• Mini lathe user manual (https://littlemachineshop.com/images/gallery/info/MiniLatheUsersGuide.pdf)
• http://www.babinmachine.com/PDF/HLV-Operation%20manual.pdf
• Wiring Schematic
• Wiring Diagram

Maintenance

Cleaning

Daily:

• Clear all chips off the lathe into the trough below.
• Oil the ways with ISO68 way oil.

Weekly:

• Clean chips out of the trough into trash cans
• Lubricate the collet closer

Periodic:

• Adjust and oil the brake pad in accordance with the maintenance manual.
• Check level and fill carriage apron with gear oil.
• Lubricate the gear box
• Clean the coolant sump

Adjustments Keeping the lathe in adjustment is an ongoing process. Check all the following adjustments when setting up the lathe and periodically during use.

Carriage The carriage is held on the ways by two adjustable retaining plates that are bolted to the bottom of the carriage. There are several fasteners in the carriage retainers. The socket head cap screws are used to adjust the position of the retainers. The setscrews and lock nuts lock the adjustments in place.

To adjust the carriage retainers:

1. Remove the right lead screw mounting bracket.

2. Disconnect the apron by removing the two socket head cap screws through the front of the carriage.

3. Slide the apron to the right and off the lead screw.

4. Loosen all the fasteners on both retainers.

5. Snug the socket head cap screws so the carriage can move, but without play.

6. Snug the setscrews. Do not over tighten.

7. While holding the setscrews from turning, tighten the lock nuts.

8. Replace the apron.

9. Replace the right lead screw mounting bracket.

Cross Slide Gibs A gib is a strip of metal placed between the bearing surface of two machine parts to ensure a precision fit and provide adjustment for wear. The lathe has gibs in several places, including the cross slide.

Adjust the cross slide gibs:

1. Loosen the three lock nuts on the side of the cross slide.

2. Slightly loosen all three setscrews on the side of the cross slide.

3. Snug each setscrew equally. This will lock the cross slide in position.

4. Loosen each setscrew 1/8 turn to allow the cross slide to move.

5. While holding the setscrews from turning, tighten the lock nuts.

6. Test by turning the handle. Loosen or tighten all the setscrews the same amount until the cross slide moves freely, but without play in the dovetail.

Cross Slide Nut The cross slide nut is adjustable to remove free play from the cross slide feed handle. The three screws in the top of the cross slide adjust the cross slide nut. The two outer screws tip the nut off horizontal to reduce the endplay in the threads. The center screw locks the adjustment in place.

To adjust the cross slide nut:

1. Loosen all three screws.

2. Back the cross slide all the way away from the center of the lathe, until it just contacts the dial.

3. Tighten the center screw until the feed handle becomes hard to turn.

4. Loosen the center screw until the feed handle just turns freely.

5. Tighten the near screw until the feed handle becomes hard to turn.

6. Loosen the near screw until the feed handle just turns freely.

7. Snug, but do not tighten the far screw.

Compound Rest Gibs The compound rest also incorporates a gib for adjustment.

To adjust the compound rest gibs:

1. Loosen the three lock nuts on the side of the compound rest.

2. Slightly loosen all three setscrews on the side of the compound rest.

3. Snug each setscrew equally. This will lock the compound rest in position.

4. Loosen each setscrew 1/8 turn to allow the compound rest to move.

5. While holding the setscrews from turning, tighten the lock nuts.

6. Test by turning the handle. Loosen or tighten all the setscrews the same amount until the compound rest moves freely, but without play in the dovetail.

Apron Position The apron is adjustable to center the half nuts horizontally on the lead screw.

To adjust the apron position:

1. Loosen the two socket head cap screws that secure the apron to the carriage. They are at the front edge of the carriage.

2. Engage the half nuts on the lead screw.

3. Tighten the two socket head cap screws.

Half Nuts There are two adjustments for the half nuts. The half nut gibs take the play out of the half nuts. The half nut closing limit stops the half nuts from closing too tightly on the lead screw.

To adjust the half nut gibs:

1. Tighten the three setscrews in the back edge of the apron to remove play from the half nuts.

To adjust the half nut limit:

1. Loosen the lock nut on the bottom of the half nuts.

2. Adjust the setscrew until the half nuts close without binding on the lead screw.

3. While holding the setscrew from turning, tighten the lock nut.

Lead Screw Mounting The brackets that mount the lead screw can move slightly to ensure that the lead screw does not bind in the half nuts.

To adjust the right lead screw mounting bracket:

1. Remove the tailstock by sliding it off the end of the ways.

2. Loosen the two mounting socket head cap screws on the right bracket.

3. Move the carriage as far to the right as possible.

4. Engage the half nuts on the lead screw.

5. Tighten the bracket mounting socket head cap screws.

6. Replace the tailstock.

To adjust the left lead screw mounting bracket:

1. Remove the change gear cover.

2. Loosen the locking nut on the change gear adjuster.

3. Loosen the two mounting socket head cap screws on the left lead screw bracket.

4. Move the carriage as far to the left as possible.

5. Engage the half nuts on the lead screw.

6. Tighten the bracket mounting socket head cap screws.

7. Tighten the locking nut on the change gear adjuster.

8. Replace the change gear cover.

Drive Belt The drive belt needs to be aligned correctly or it will wear on one side or the other.

To adjust the drive belt:

1. Unplug the power cord.

2. Remove the motor cover from the back of the lathe.

3. Remove the change gear cover.

4. Remove the control box from the front of the lathe, but do not disconnect any wires.

5. Loosen all the lock nuts on the front of the lathe.

6. Back off the top and bottom set screws a couple turns.

7. Make sure that nothing will get into the change gear drive.

8. Make sure the control box is in a safe but accessible position.

9. Plug in the power cord.

10.Reach around to the back of the lathe and hold the motor.

11. Turn the motor on at slow speed.

12.While the motor is running, move the motor to a position where the belt has sufficient tension and does not rub either side of the pulley.

13.Tighten the nuts on the two studs that are aligned horizontally.

14.Snug the setscrews that are aligned vertically.

15.Turn off the motor.

16.Tighten the lock nuts.

17.Replace the control box.

18.Replace the change gear cover.

19.Replace the motor cover.

Lubrication Recommend the use of two lubricants on your lathe.

1. Mobil 1 synthetic motor oil. 2. Lubriplate 630-AA lithium (white) grease.

The following points on your lathe require lubrication.

The spindle and countershaft bearings are deep groove ball bearings that are shielded and do not require additional lubrication.

Lubricating the Transmission Gears, lubricate the transmission gears without removing the headstock by using a spray can of lithium grease.

To lubricate the transmission gears:

1. Unplug the power cord.

2. Remove the control box from the front of the lathe, but do not disconnect any wires.

3. Remove the screw or screws holding the ground wires to the front of the headstock.

4. Insert the lithium grease can’s spray tube into one of the open holes.

5. Spray the grease while rotating the chuck by hand.

6. Shift the high/low speed shifter to the opposite position.

7. Spray the grease while rotating the chuck by hand.

8. Reconnect the ground wires.

9. Replace the control box.

10.Plug in the power cord.

Changing Chuck Jaws 3-Jaw lathe chucks come with two sets of jaws. The “normal” set is called the inside jaws, because the stepped side is designed to fit inside of hollow work pieces and hold by an outward force. In many cases, however, these jaws are used to clamp on the outside of smaller objects using the long straight side. The second set of jaws is called the outside jaws because the stepped side of these jaws is designed to clamp on the outside of larger objects. Because of the construction of a 3-jaw chuck, each of the three jaws in a set is different. You will find a number in the groove in the side of each jaw that identifies its position in the set.

To install a set of chuck jaws:

1. Place the three jaws in numeric order on the bench.

2. Slide jaw number 1 into the slot in the chuck that has the serial number stamped in it.

3. Press the jaw into the slot with one hand, and with the other hand, turn the chuck key to open the chuck.

4. You will feel the jaw move out in the slot as you turn. Stop turning right after the jaw clicks inward in the slot.

5. Turn the chuck key to close the chuck about ¼ turn to engage jaw 1.

6. Slide jaw 2 into the next slot counterclockwise from jaw 1 when you are looking toward the headstock.

7. Slide jaw 3 into the open slot.

8. While pressing jaws 2 and 3 into the slots, turn the chuck key to close the chuck.

TO REMOVE MOTOR BELT:

1. Run countershaft carrier bracket to top position (highest spindle speed setting).

2. Turn brake control selector switch to “OFF”.

3. Remove nut and steel washer from motor plate hold down bolt and raise motor plate 2” to 3” and block.

4. Remove brake drum from motor shaft by taking out four lock screws and set screws. The four keyway in the pulley brake drum are numbered. When removing pulley note the keyway number that the motor shaft key is in so it can be assembled in the same location.

5. Roll head belt off of countershaft pulley then slide countershaft pulley assembly to extreme right.

6. Pass head belt and motor belt around and off end of shaft.

7. Put new motor belt in place.

8. Replace head belt on countershaft and reassemble.

TO REMOVE HEADSTOCK BELT:

1. Follow instructions “How To Remove Motor Belt” steps 1 through 5 above.

2. Pass head belt around and off end of shaft.

3. Remove switch pull rod that goes through belt.

4. Remove collet closer.

5. Remove handwheel snap ring and handwheel.

6. Remove handwheel spindle key, spring spacer and washer.

7. Remove both back covers from gear box.

8. Remove snap ring in front of idler gear bearing.

9. Screw push screw “IN” to remove gear, shaft and bearing.

10. Remove lock screws in shifter yoke, unscrew shaft with ¼” hex key wrench in end of shaft and pull shaft way out (~ 5”).

11. Use switch pull rod as hook and bring belt part way out of opening and around end of spindle and then out through top opening in rear of gear box.

12. Tie weighted string around new belt and drop through opening for belt, to guide it down through gear box and pedestal.

13. Install new belt.

14. Use switch pull rod to lift belt up on to spindle pulley.

15. Push shifter back in and screw in place. Lever must be in vertical position.

16. Locate shifter yoke on shaft by lining up screw holes.

17. Replace idler gear, shaft, bearing and snap ring.

18. Line up gears.

19. Replace head belt on countershaft and reassemble.

List of Specifications

The lathe is powered by a rotary phase converter which delivers 3 phase, 240VAC to a transformer which steps the voltage up to 460V.

 

                               END OF THE PROCEDURE