failure mode
FM-18: FM-18 A KNOWN-STRAIGHT BIT SHOWS VISIBLE WOBBLE OR RUNOUT
FM-18 A KNOWN-STRAIGHT BIT SHOWS VISIBLE WOBBLE OR RUNOUT
Diagnostic overview
FM-18 A KNOWN-STRAIGHT BIT SHOWS VISIBLE WOBBLE OR RUNOUT
Likely Root Causes
- First bit is bent or has a damaged shank
- Bit is not fully seated in the chuck
- Debris holds the shank off center
- Anvil, chuck sleeve, or front support is worn or bent
Quick Checks
- A known-straight bit rotates on center without visible runout.
Repair Preview
1.
This is a preview of the troubleshooting guidance included in the full repair manual.
Related symptoms
A straight bit traces a visible circle at no load instead of rotating on a stable centerline.
A straight bit traces a visible circle at no load instead of 1. Remove the pack, clean the chuck bore, and inspect the first bit for bend or
Included in the full manual
- root cause analysis
- tools needed
- step-by-step repair procedure
- diagrams
- exploded views
- post-repair checks
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