VMC - 20/30/40-Taper - Belt/Gearbox - TRP Single Sensor - No TSC - Adjustment

Applies to machines built from: 
November, 2013

VMC - 20/30/40-Taper - Belt/Gearbox - TRP Single Sensor - No TSC - Adjustment - Introduction

This procedure tells you how to do these adjustments:
  1. drawbar height
  2. proximity sensor ("switch") position for the engaged (clamped) drawbar.

Machine Compatibility

Do this procedure on a vertical mill with these components:
  • belt/gearbox drive
  • 30- or 40-taper spindle
  • a single-sensor tool-release piston
  • an adjustable TRP proximity sensor

VMC - 20/30/40-Taper - Drawbar Height - Check

Step 1

Jog the X Axis and the Y Axis until the spindle is in the middle of the table.

Put a toolholder with no tool into the spindle. Put a piece of paper on the table to protect the table. Put the aluminum block on the piece of paper.
Jog the Z Axis in the negative (-) direction.
Do this until the toolholder is approximately 0.30" (8 mm) from the top of the block.

Step 2

Push .001/1.

Jog the Z Axis in the negative (-) direction one increment at a time. Jog until the toolholder lightly touches the block.
The block can move in the X and Y axes, but not in the Z Axis.
caution: Do not push the tool-release button. This causes a Z-Axis overload.

Step 3

Push .001/1.

Jog the Z Axis in the negative (-) direction 0.002” (0.05 mm).
The block is tight.
Push POSIT to show the Position display. Push MDI and then HAND JOG to change the position display to zero.
Jog the Z Axis in the positive (+) direction 0.100" (2.54 mm) above the block.
Push and hold the tool-release button. With moderate force, try to move the aluminum block. If the drawbar height is correct, the block does not move at 0.100.

If the block moves, go to Step 4. If the block does not move, go to Step 5.

Step 4

Do this step if the block moved in Step 3.

Push MDI and then HAND JOG. Push .01/10.
Jog the Z Axis in the negative (-) direction 0.01” (0.254 mm), one increment.
Push and hold the tool-release button.
Try to move the aluminum block. If the block moves, jog the Z Axis one increment at a time until the block cannot move. Record the number of increments you must move the spindle. The number of increments is the number of shims to add.

Step 5

Do this step if the block did not move in Step 3.

Push .01/10.
Jog the Z Axis in the positive (+) direction 0.01” (0.254 mm), one increment.
Push and hold the tool-release button.
Try to move the aluminum block. If the block does not move, jog the Z Axis one increment at a time until the block moves. Record the number of increments you must move the spindle. The number of increments is the number of shims to remove.

VMC - 20/30/40-Taper - Belt/Gearbox Drive - TRP - Add or Remove Shims

Step 1

Disconnect the proximity-switch and solenoid cables at the solenoid bracket.

Disconnect the pre-charge and tool-release air tubes from the solenoid. Lift the TRP assembly from the spindle and move it forward to remove it.

Step 2

Use an open-ended wrench to hold the TRP shaft. Use a closed-end wrench to turn the TRP bolt [1] clockwise to loosen.

note: The threads for the tool-release bolt go in the opposite direction.
Add or remove shim washers [2] from the tool TRP bolt. Apply medium-strength thread-locking compound (for example, blue Loctite®) to the TRP bolt.

Install the TRP bolt into the bottom of the TRP. A torque wrench is not necessary to tighten the TRP bolt. Install the TRP assembly into the machine. Torque the TRP screws. Refer to Haas Fastener Torque Specifications. Use the value for iron.

Connect the pre-charge and tool release air tube to the solenoid. Connect the proximity-switch and solenoid cables. Do the "DRAWBAR HEIGHT CHECK" steps again.

VMC - 20/30/40-Taper - Belt/Gearbox Drive - TRP - Pre-charge - Adjustment

caution: Do not do this procedure on a machine that has through-spindle coolant (TSC). This damages the TSC system.

Step 1

Find the knob on the pre-charge air regulator. Turn the knob clockwise until it stops.

Make sure Parameter 149 PRE-CHARGE DELAY is set to 300.

Make sure no tool is in the spindle.

Push the Tool Release button.
note: If the pre-charge is not correctly adjusted, you hear a loud noise when the piston hits the drawbar.

Turn the main air pressure regulator clockwise one half turn.

Push the Tool Release button.

If you hear the TRP hit the drawbar, turn the main air pressure regulator clockwise one quarter turn.

caution: Do not increase the pressure too much. Only increase the pressure until you cannot hear the TRP hit the drawbar.

VMC - 20/30/40-Taper - Belt/Gearbox - TRP Single Sensor - No TSC - Adjustment

Step 1

Clear the EMERGENCY STOP. Push RESET for each alarm.
Push PARAM/DGNOS (2) times.
Push the RIGHT CURSOR arrow to go to the I/O tab.

Make sure that Draw Bar Open = 0.

Step 2

Find the bolt to adjust the height of the proximity sensor. Use a wrench to turn the bolt.

Turn the bolt until the light on the sensor goes off. Turn the bolt 1/2 of a turn in the same direction.

Push the tool release button (2) or more times.

Make sure that the light on the sensor goes off each time you push the button.

Step 3

Push PARAM/DGNOS. Push the RIGHT CURSOR arrow until the I/O tab shows.

Make sure Draw Bar Open = 0.
Jog the Z Axis in the negative (-) direction 0.01" (0.254 mm) to 0.05" (1.270 mm) from the block.
Push and hold the tool release button. Make sure that Draw Bar Open stays 0. If Draw Bar Open does not stay 0, the adjustment is not correct. Do Steps 2 and 3 again.
Jog the Z Axis in the negative (-) direction 0.01" (0.254 mm) to 0.06" (1.524 mm) from the block.
Push and hold the tool release button. Make sure that Draw Bar Open changes to 1. If Draw Bar Open does not change to 1, the adjustment is not correct. Do Steps 2 and 3 again.
Push AUX CLNT to start the TSC. Make sure the TSC system has no leaks.

Be aware: Many service and repair procedures should be done only by authorized personnel. The service technicians at your Haas Factory Outlet (HFO) have the training, experience, and are certified to do these tasks safely and correctly. You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes.

Danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not completely understand. Contact your Haas Factory Outlet (HFO) and schedule a service technician visit if you have any doubts about doing a procedure.

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