How to identify the Multi-Piece and the Unibody trunnion   

1) Multi-Piece trunnion:    UMC machines built approximetely before 11/2022 will have this configuration.

2) Unibody trunnion:    UMC machines built approximetely after 11/2022 will have this configuration.

Remove the A-frame trunnion support:

Remove the bolts [1] that secure the A-frame trunnion support [2] to the base and take out the shims between A-frame support and the base.

Rotate the A-frame support [2] counter-clockwise to clear the edge of the base [3].

Pull the A-frame support off the bearings.

 Note: The A-frame support might vacuum lock on the bearings. Use the zip-tie to pry the seal [4] open.

 Caution: To lift the trunnion support, get the aid of another person. The support weighs 85 lbs (39 kg).

Measure the B- axis of rotation parallelism to the Y-Z plane:

For a machine with a Classic Haas Control, change Parameter 151:20 (B axis CHK TRAVL LIM) to 0.

For a machine with a Next Generation Control, change Parameter 6.021 (B axis CHK TRAVL LIM) to FALSE.

Measure the parallelism of the platter to the Y-Z plane with the B axis at 90° and then the B axis at -90° as shown in the picture.

Position the Y-Axis in the following starting position:

UMC-500: Y=0, Sweep 15”, 3rd T-Slot Land from the top.

UMC-750/1500-Duo: Y=-1.0, Sweep 18", 3rd T-Slot Land from the Top .

UMC-1250: Y=-1.0, Sweep 28", 3rd T-Slot Land from the Top.

UMC-500PP: Y=-4.0, Sweep 7".

UMC-750PP: Y=-2”, Sweep 15".

UMC-1000PP: Y=-4”, Sweep 15".

Compare the results at B 90° and B-90°. The results should be...

• Symmetric against the Y-Z plane, positive or negative direction
• Less than 0.0010"/20"

If the results are symmetric against Y-Z plane, and are less than 0.0010"/20 inches: Go to Step 5.

If the results are symmetric against Y-Z plane, but are more than 0.0010"/20 inches: Go to Step 4.

 Warning: If the results [3] are not symmetric against the Y-Z plane, the B axis rotary needs to be aligned: Go to Step 3.

Align the B axis of rotation parallel to the Y-Z plane:

Loosen the (6) bolts [1] that secure the B axis rotary to the base casting.

 Note: Keep the bolts sufficiently snug to control the adjustments.

Adjust the front and rear setscrews [2] until the measurements taken in Step 2 are symmetric against the Y-Z plane.

Torque the (6) bolts [1]. Refer to Haas Fastener Torque Specification.

Verify the measurements in Step 2 after the bolts have been torqued.

Align the C Axis of rotation perpendicular to the B Axis of rotation:

Remove the bottom C-Axis access cover.

Loosen the (12) bolts [1] that hold the C Axis body to the B Axis platter face.

Reach the bottom (4) bolts through the C Axis access port.

If the B Axis is symmetric in the positive direction [4], install horseshoe shims [2] of appropriate size behind the top (2) bolts.

If the B Axis is symmetric in the negative direction [5], install horseshoe shims [2] of appropriate size behind the bottom (2) bolts.

Torque the (12) bolts to 80 Ft-lbs (108 Nm).

Cut the excessive shim material off.

Verify the measurements in Step 2 after bolts are torqued.

Align the trunnion support shaft co-axial with the B Axis of rotation:

Setup (2) indicators on the outer race of the trunnion support bearing [2] as shown in the picture.

Mark the spot on the outer race where one of the indicator needles is contacting the surface.

After moving the B Axis to 90° or -90° you will align the marked spot with the needle again to exclude the bearing runout error from the measurements.

Take the readings when B is at 90° and B at -90°. Compare the readings. 

 Caution: The B axis brake needs to be clamped when taking the readings.

The deviation between the results when B is at 90° and at -90° needs to be less than 0.001" on each indicator.

 Note: The indicator on the side of the bearing will measure top to bottom alignment and the indicator on the top of the bearing will measure side to side alignment.

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For models with a multi-piece trunnion

Loosen the (6) bolts [3] on the C Axis body support. Keep the bolts sufficiently snug to control adjustment.

Adjust the (8) set screws [4] until deviation between B at 90° and B at -90° is within 0.001".

Torque the (6) bolts [2] on the C Axis body support to 80 Ft-lbs (108 Nm).

Verify the alignment after the bolts have been torqued.

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For models with a unibody trunnion

Jog rotary to B90. Set up an indicator on the highlighted surface as shown in the lower diagram .

Rotate B-axis 180 degrees (90 to -90).

Run out (NTE 0.010” TIR).

 Caution: If the measurement exceeds the tolerance then contact support.

Install and shim the A-frame trunnion support:

Move the B Axis to 90°.

Setup an indicator [1] against a machined surface of the C Axis body. Set the indicator to 0.

Use plastic zip ties [2] to pry the seal open while installing the A-frame support. This lets unwanted air and grease out of the assembly.

Install the A-frame trunnion support [3] over the bearings.

Remove the cable ties.

Turn the trunnion support clockwise until it is vertical.

 Note: The weight of the A-frame support will cause the trunnion to sag. The amount of sag is measured with the indicator that was previously setup on the side of the C Axis body.

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For multi-piece trunnions

Adjust the shims [4] between the A-frame support and the base casting to remove the sag until indicator reads 0 again.

When the indicator reading is 0, torque the (4) bolts. Refer to Haas Fastener Torque Specification.

Verify the reading after bolts are torqued. Adjust the shims again if necessary until the indicator reads 0.

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For models with unibody trunnion

Determine the amount of shim stock [4] needed to raise the Trunnion arm so the indicator reads 0.005".

The indicator [1] value will change once the support is torqued.

With indicator still in place:

• Torque trunnion support bolts to appropriate values.
• Check indicator to make sure it reads between the range of

Trunnion arm raised (0.005” to  0.010”).

 Note: For unibody trunnions, the shim location may also be used to correct the C-axis to X-Y plane perpendicularity instead of shimming the saddle trucks.

 Caution: Use equal amount of shims on each side of the A-frame support. Unequal shims will cause the A-frame support to pull the trunnion to the side.

Verify the B Axis of rotation alignment to the Y-Z plane (Step 2). Loosen the bolts and tap the A-frame support side to side if necessary to correct the B axis to Y-Z plane alignment.

Set C-axis perpendicular to X/Y plane:

Move the axes to

UMC-750's........X= -10.5" & Y=0."

UMC-1000's......X=-17.0" & Y=-0."

Zero an indicator [1], on a Ground Block [2], 1/2" off the edge at the rear of the platter (Mag-Base on Spindle), with C at 0 Degrees

Rotate C-Axis to 180°.

Move Y axis, and ground block, in Y Axis negative direction until you are 1/2" away from platter edge, and take the perpendicularity measurement

Adjust the shims until the average error is within 0.0005" end to end.

 Note: For unibody trunnions, the shim location under the bearing support may also be used to correct the C-axis to X-Y plane perpendicularity instead of shimming the saddle truck.

Caution: Shim either two front trucks or two rear trucks with the equal shim.

Note: Shim one truck at the time to maintain the X to Y squareness.

Verify the measurements after all bolts are torqued.

Verify the X to Y alignment in Step 2.

Set the tool change offsets:

B-axis tool change offset [1]

For Classic Haas Controls, change Parameter 213. 

For Next Generation Controls, go to: Settings>Rotary Tab>Highlight the rotary and press [INSERT], or change Parameter 6.078 (B TOOL CHANGE OFFSET) to set the trunnion (B Axis) parallel to the X Axis.

For models with multipiece trunnion

(NTE 0.001/10"; NTE 0.0020" overall)

For models with unibody trunnion

(NTE 0.0005/10"; NTE 0.0010" overall)

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C-axis tool change offset [2]

For Classic Haas Controls change Parameter 523.

For Next Generation Control go to: Settings>Rotary Tab> Highlight the rotary and press [INSERT], or change Parameter 7.078 (C TOOL CHANGE OFFSET) to set the table T-slot (C Axis) parallel to the X Axis

For models with multipiece trunnion

(NTE 0.001/10"; NTE 0.0020" overall)

For models with unibody trunnion

(NTE 0.0005/10"; NTE 0.0010" overall)

Check C-axis perpendicularity to X/Y plane:

Align the indicator centered over the C-axis bore with the Y-axis at -10.

Jog positive in the Y-axis and align the indicator over the center of the last section of the platter and make a mark at this spot with a washable marker.

Insert 1-2-3 block as shown and set the indicator to zero.

Remove the block and rotate the platter 90 degrees, following the marked spot with the indicator.

Insert block back between the indicator and platter. Note reading.

Repeat the previous two steps, taking readings with the platter at 180, 270 and 360 degrees.

Multi-piece trunnion:  (NTE 0.0005")

Unibody trunnion: (NTE 0.001")

Measure the intersection of the B and C axis:

Follow the linked instruction manual to complete this step.

B-Axis and C-Axis intersection Adjustment

Align the B-Axis brake disk:

 Note: Do not do this step if you are working on a SS machine.

Operate this code in MDI mode to unclamp the brake:

M11;

Loosen all of the brake disc bolts [1] and torque them to 5 Ft-lbs (7 Nm).

Operate this code in MDI mode to clamp the brake:

M10;

Wait 10 seconds.

Torque the bolts. Refer to Haas Fastener Torque Specifications.