Bump

verbShop talkMachine Shop

To make a small adjustment to an offset or position, usually a thou or less, to bring a size in.

Changing a wear offset or nudging an axis by a tiny amount, as in bump the offset a half thou. In CNC work it is how operators hold size as tools wear without editing the program. On manual machines it means tapping the handwheel or jog by the smallest increment.

Heard on the job

Diameter's drifting up as the insert wears, bump the X wear offset minus three tenths and keep running.

Also heard as

  • nudge
  • tweak