TROUBLESHOOTING
Problem
Solution
• Choose correct tap with lower rake angle and/or higher relief. • Choose coating suitable for specific application. • Increase cutting speed. • Improve quality and quantity of lubrication.
Tap sticking
• Choose suitable tap, with base material in HSSE-PM. • Use coated tap. • Improve quality and quantity of lubrication.
Crater wear
• Check drilled hole size. • Check alignment between tap and drilled hole. • Reduce cutting speed. • On blind holes, check that tapping depth is less than hole depth.
Tap breakage
• Use tapping attachment with slip clutch. • Use compensated tapping attachment.
• Check tap tolerance is compatible with requested workpiece (nut) tolerance. • Choose correct tap with suitable rake angle and relief for specific application. • Reduce feed rate (revs x pitch) or use rigid / synchronous tapping attachment. • Reduce cutting speed. • Check tap alignment and that workpiece is fastened steadily. • Remove clogged chips from flutes.
Oversized thread
• Check drilled hole size is not too small. • Check tap tolerance is compatible with requested workpiece (nut) tolerance. • Use coated tap to avoid tap sticking. • On forming taps, use slightly larger drilled hole size.
Undersized thread
• Check wear on tap. If necessary, resharpen or change tap. • Choose correct tap with higher rake angle and relief.
• Use rigid / synchronous tapping attachment. • Improve quality and quantity of lubrication.
• On high strength materials, increase drilled hole size. • Check wear on tap. If necessary, resharpen or change tap. • Choose correct tap with higher rake angle and relief. • Improve quality and quantity of lubrication.
Excessive power requirement
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