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UMC-750 - B-Axis and C-Axis Intersection - Alignment - AD0308

Service Home How To Procedures UMC-750 - B-Axis and C-Axis Intersection - Alignment - AD0308
Recently Updated Last updated: 03/02/2021

UMC-750 - B-Axis and C-Axis Intersection - Alignment


AD0308

Applies to machines built from June 2012

UMC-750 - B-Axis and C-Axis Intersection - Alignment - AD0308

- Jump to Section - 1. Introduction 2. B Axis to XYZ Axes Alignment 3. B Axis to C Axis Intersection Tool Setup 4. B Axis to C Axis Intersection Adjustment Back to Top

Introduction

This procedure shows you how to measure and align the intersection of the B and C axes.  Before attempting this procedure verify that the machine is level per UMC-750 leveling.

You will need to align the B and C axes after you either:

  • Replace the B and C axes
  • or complete a UMC inspection report and find an issue

The 5‑Axis Rotary Center Distance defines the difference between the rotary centers of rotation: C-Axis Machine Rotory Zero Point (MRZP) and the B-Axis MRZP in the X Axis.

It is possible there is no difference between the C-Axis and the B-Axis MRZP.

  • Classic Haas Control (CHC): Parameter 1314 - Rotary Axes Center Deviation in X
  • Next Generation Control (NGC): Setting 254 - 5 Axis Rotary Center Distance

You will need the following tools:

  • T-2195A UMC Aligment Bar Adapter
  • T-2113 Alignment bar
  • Heat gun and heat resistant gloves

B Axis to XYZ Axes Alignment

1

Remove the A-frame trunnion support:

Remove the 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).

2

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.

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.

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 measurments 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.

4

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.

5

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.

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.

6

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.

Adjust the shims 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.

 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.

7

Set the tool change offsets:

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

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

Install the C Axis cover.

8

Align the X-Y plane perpendicular to the C Axis of rotation.

Make sure that B axis is at 0°.

Jog the C Axis to 90°.

With the Y Axis at -10." align the indicator over the center of the platter.

Jog the X Axis to move the indicator [1] over the second rib of the platter

Indicate the platter surface along the Y Axis.

Record the direction and the magnitude of the error.

Jog the C Axis to 270°.

Indicate the platter surface along the Y Axis.

Record the direction and the magnitude of the error.

Average the error measured while C is at 90° and at 270° paying close attention to the +/- signs.

 Note: This will exclude C Axis platter face runout error from the measurements.

Adjust the shims between X Axis trucks and the saddle until average error is within 0.0005" end to end.

 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.

9

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.

B Axis to C Axis Intersection Tool Setup

1

Install the B Axis and C Axis intersection tool:

Jog the C Axis to 0°.

Push [EMERGENCY STOP].

Clean the table.

Guide the shaft of the adapter [1] while you slowly lower it into the center bore.

Attach the adapter to the table with (2) screws [4] and (2) T-nuts.

Attach the alignment bar [2] to the adapter with (3) screws [3].

Snug the (3) screws to allow for adjustments in the next step.

2

Align the B/C intersection tool with the C Axis:

Put an indicator on the front side of the alignment bar near the base.

Release the [EMERGENCY STOP]. Push [RESET] to clear any alarms.

Jog across the tool in the X Axis to find the high spot.

Set the indicator to 0.

Jog the C Axis 360°.

Lightly tap the base with a rubber mallet to adjust the radial error on the alignment bar.

Note: Adjust the alignment bar to half of the measured error, because you are measuring the diameter error.

Jog the C Axis 360°.

When correctly adjusted the radial error is less than 0.0002" (0.005 mm).

3

Check the B/C intersection:

Center the indicator [1] on the front side of the alignment bar near the top of the cylinder.

Jog across the tool in the X Axis to find the high spot.

Zero the indicator.

Jog the C Axis 360°.

Turn the (3) screws [2] on the alignment bar to adjust the runout.

Jog the C Axis 360°.

When correctly adjusted the radial error is less than 0.0002" (0.005 mm).

Repeat Step 2 and verify the alignment did not change.

B Axis to C Axis Intersection Adjustment

1

Set Parameter 151:20 (B-Axis CK Travel Limit) to 0.

Change CHC Parameter 1314 (ROTARY AXIS CENTER DEVIATION IN X) or  NGC Setting 254 (5-Axis Rotary Center Distance) to 0.

Push [ZERO RETURN]. Then push [ALL].

Jog the B Axis to -90°.

Note: The rotary positions are for reference only.

Put an indicator [1] on top of the alignment bar.

Jog in the Y Axis to find the high point.

Set the indicator to 0.

Jog across the alignment bar in the X Axis [2].

Jog the B Axis to adjust the alignment bar parallel to the X plane.

Set the indicator to 0.

Jog the Y Axis to 0.

Caution: Make sure the indicator assembly is clear of the B Axis movement.

 Caution: Do not move the Z Axis.

2

Jog the B Axis to +90°.

 Caution: Make sure the indicator assembly is clear of the B Axis movement.

Jog the Y Axis [1] to find the high point on the alignment bar.

Note: Do not set the indicator to 0.

Jog across the alignment bar in the X Axis.

Jog the B Axis to adjust the alignment bar parallel [2] to the X plane.

When the alignment bar is parallel to the X plane, the indicator reading is the change needed in the Z Axis (∆Z=indicator reading).

Record the value shown on the indicator. In this example the indicator now shows 0.0015". ∆Z is 0.0015".

3

Do these calculations to get the value for CHC Parameter 1314 or NGC Setting 254. (In this example the difference in readings for the B-C intersection (∆Z) is 0.0015".):

  • ∆Z / 2 x 10,000 = CHC Parameter 1314 / NGC Setting 254
  • 0.0015 / 2 = 0.00075
  • Round down to 4 decimal places: 0.00075 = 0.0007 (NGC Setting 254)
  • 0.0007 x 10,000 = 7 (CHC Parameter 1314)

Set Parameter CHC Parameter 1314 (Rotary Axes Center Deviation in X) or NGC Setting 254 (5-Axis Rotary Center Distance), to the calculated value.

In this example, set parameter CHC Parameter 1314 to 7 or NGC Setting 254 to 0.0007.

Cycle the power to save CHC Parameter 1314 or NGC Setting 254.

Repeat Steps 1-3 to verify that the value for ∆Z is less than 0.0002" (0.005 mm).

4

Jog the B Axis to the home position.

Set parameter 151:20 (B-Axis CK Travel Limit) to 1.

Make sure the MRZP offsets are correct.

Calibrate WIPS per Wireless Intuitive Probe System (WIPS) - Calibration.

Complete an inspection report. Refer to UMC-750 Inspection Report.

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