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C-Axis — Engagement Offset — ST 15-30 — Lathe — NGC

NGC Lathe — C- Axis Engagement Offset

The NGC Lathe C-axis, no longer uses tool change offsets for orienting the C-axis relative to the Spindle. When the C-

axis is commanded to engage, it commands the C-axis to its Zero position and commands the Spindle to the Spindle

Orientation position (which is established during the alignment process)

C-Axis Disc Runout Check/Adjust

C-Axis — Engagement Offset — Lathe — NGC

Page 1 of 6 pages

1

Make sure the C-axis is disengaged (M155), and

the spindle can turn freely.

Loosen the bolts that hold the C-axis disc just

enough so that the runout of the disc and union

can be adjusted with a soft mallet. Verify that the

runout of the hydraulic union is less than 0.001″

TIR. If it is not, gently tap with the mallet until it is

within specification.

2

Once the runout of the union is within

specification, set the runout of the C-axis disc.

Place a small drill bit across the C-axis disc teeth

for the indicator to land on. This prevents the

indicator from interfering with the gear teeth.

Set the drill bit at four spots around the entire

diameter of the disc to measure the runout. If the

runout is greater than 0.001″ TIR, tap the C-axis

disc with a soft mallet to bring it within

specification.

LAST UPDATED: 05/04/2020

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