American Machinist

No more fiddling with loose bolts. (Practical Ideas).

EXTREME CUTTING PRESSURES associated with high-power machine tools can move tool holding or workholding devices. For instance, tool-post bolts on lathes or clamp bolts on milling machines may loosen slightly, ruining setups.

To prevent this from happening, I apply a small amount of rosin (the kind violinists use) to the bolts before tightening. …

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