Page 574 - Dormer

GENERAL HINTS

TROUBLE SHOOTING WHEN TAPPING

PROBLEM CAUSE REMEDY
Breakage Tap worn out Use a new tap or regrind the old one

Lack of lubricant Use good lubrication in order to prevent built up edge and
chip blockage. See lubricant section in technical handbook
Taps hit bottom of hole Increase depth of drilling or decrease depth of tapping

Tap speed too high Reduce cutting speed. Follow recommendation in
Catalogue / Product Selector

Work hardening surface Reduce speed. Use coated tool Use good lubrication.
See section for machining of stainless steel in technical
handbook

Tap drill hole too small Increase drill diameter up to maximum value. See tap drill
tables

Too high torque Use tapping attachment with torque adjustment clutch

Material closing in after tapping See recommendation in Catalogue / Product Selector for
correct tool alternative

Rapid wear Wrong type of tap for application Use tap with lower rake angle and/or higher relief and/
or longer chamfer. Use coated tool. Check Catalogue or
Product Selector for correct tool alternative

Lack of lubricant Use good lubrication in order to prevent built up edge and
thermal stress on cutting edge. See lubricant section in
technical handbook
Tap speed too high Reduce cutting speed. Follow recommendation in
Catalogue / Product Selector

Built up edge Wrong type of tap for application Use tap with lower rake angle and/or higher relief. Check
Catalogue or Product Selector for correct tool alternative

Lack of lubricant Use good lubrication in order to prevent built up edge. See
lubricant section in technical handbook

Surface treatment not suitable Choose a tap with the recommended surface treatment

Tap speed too low Follow recommendation in Catalogue / Product Selector

573