MACHINING OPERATIONS ARE LOUD ("CHATTERY")
Cause: Insufficient preload of drawbar springs.
Probability How-To Steps
Medium Verify that there's sufficient preload of the drawbar disc springs:
1. Examine the shop air pressure, and verify that there's a minimum of 90 psi
compressed air at the machine's FRLFilter-Regulator-Lubricator.
If the machine's inlet air pressure is too low, it limits the machine's maximum
tool clamping force.
2. Tighten the spring stack compression nut and jam nut to increase the tool's
clamping force.
3. Adjust the power drawbar cylinder's piston bolt to maintain a 0.5 mm (0.20 in.)
gap with the spindle's spring stack when there's no tool loaded in the spindle.
Secure the piston bolt jam nut.
4. Verify that the clamping force is increased as high as possible while still
smoothly and reliably clamping and unclamping tool holders.
Cause: Under- or over-tightened pull stud.
Probability How-To Steps
Medium Use the following items to tighten the pull studs to 40 Nm (30 ft lb) of torque:
l Socket, BT30 Pull Stud (PN 39420)
l Tool Tightening Fixture, BT30 (PN 39681)
l Torque wrench
Under- or over-tightening the pull studs can cause poor contact between the tool
holder and the spindle taper.
Cause:Cracked or broken disc springs.
Probability How-To Steps
Low Remove the disc springs from the drawbar assembly and inspect them for
damage.
If you find any cracked or fractured springs, replace all 16 disc springs in the stack
with Disc Spring, 40 mm × 20.4 mm × 2.0 mm × 3.10 mm (PN 39689).
Page 42
©Tormach® 2021
Specifications subject to change without notice.
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TD10705: Installation Guide: BT30 Spindle Upgrade Kit for 1100M+ (0521A)
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