TB-0043 REV B 20-August-20101

TECHNICAL BULLETIN #0043ST Lathe Turret ServiceOverview:This procedure explains the ST / SS 20 & 30 lathe gearbox disassemble, reassemble and home switch adjustment during overhaul. Read the procedure in its entirety before doing any work.

Turret clampswitch

Turrethomeswitch

Homeswitchflag

Anti-rotationbracket

Keyed collarTurret unclamp

switch

View of turret with back cover removedGeneral steps of gearbox overhaul procedure:1) Gearbox Disassemble2) Inspect / Replace Internal Parts3) Gearbox Reassemble4) Home Switch Check and Adjustment

Preparation for procedure:1) Power up the machine and home all axes. Jog the wedge assembly to a position where it can be worked on from the right side.

2) Index tool 1 to cutting position (can be verified on Current Command page). Press Emergency-Stop.TB-0043 REV B 20-August-20102

TECHNICAL BULLETIN #0043 Turret at tool and press Emergency Stop3) Disconnect the air supply from the machine. 4) Discharge the residual air pressure in the turret clamp/unclamp system by triggering the solenoid valve with a small screwdriver or a ball point pen several times until the air pressure has been released.

Solenoid valve - manual trigger locationGearbox Disassemble1) Mark and disconnect turret clamp/unclamp air hoses.

Air hose marked with zip ties.TB-0043 REV B 20-August-20103

TECHNICAL BULLETIN #0043 2) Remove the air hose fittings. Note: It is possible that when the fitting is taken out, a short piece of pipe may come out with it.

Removing clamp and unclamp fittings.3) Disconnect the coolant hose and its fittings from the keyed coolant manifold tube.

Remove coolant fittings4) Disconnect turret clamp and unclamp switch connectors. Disconnect all plugs from the connector bracket on the back of the turret, then. Remove the connector bracket from the casting.

Disconnect and remove bracketTB-0043 REV B 20-August-20104

TECHNICAL BULLETIN #0043 5) Disconnect A-axis home switch connector, servo motor connectors and remove motor.

Disconnect and remove motor6) Remove the keyed collar, and remove the key on the coolant tube.

Removing keyed collar.7) Remove coolant tube anti-rotation bracket.

Anti-rotation bracket.TB-0043 REV B 20-August-20105

TECHNICAL BULLETIN #0043 8) Remove A-axis home switch bracket with home switch on it.

Removing home switch bracket.9) Remove home switch flag from the main shaft using a 7/16" open end wrench or crow's foot wrench.

Home switch flag (Crow's foot wrench shown)10) Remove the mounting bolts on the tool turret gearbox end plate.

Removing plate bolts.Note: Do not move the turret clamp and unclamp switches from their positions. TB-0043 REV B 20-August-20106

TECHNICAL BULLETIN #0043 11) Use 3 5/16-18X11/2 SHCS (Haas p/n 40-1715) to evenly remove the end plate out from the gearbox housing.

Note: Once the plate is removed check for spacers that are stuck to the back-side of the plate. Remove and set aside with the other hardware.

12) Remove the gears from the gearbox.

13) Clean the inside of the gearbox and all removed components. Inspect / Replace Internal Parts1) Inspect gears for signs of damage. inspect bolts for deformation.

The following below shows an impact that deformed the teeth on the smaller gear. When an impact is carried on the axis, the smaller gears will show more damage than the larger gears.

Smaller gear-teeth show damage of an impactTB-0043 REV B 20-August-20107

TECHNICAL BULLETIN #0043 The following image shows a larger impact. This impact stressed the bolts that attach the turret shaft gear. in this case the bolts sheared off and left an imprint on the bolt holes as well as deforming the mating surfaces.

Turret shaft gear.2) Finally inspect that the gasket, seals and O-rings for damage. Gearbox Reassemble1) Lightly grease all 3 shafts in the gearbox, end plate shaft seal, O-rings, and dowel pins. Lightly grease the gearbox housing end surface and install the end plate paper gasket on it.

Lubricate the three gearbox shafts