Difference between Roll Tap and Normal Tap

[AlliedAuto]

Can somebody tell me the difference between a Roll Tap and a normal Tap. Does a roll tap not produce swarf. I've read that somewehere but surely some swarf has to be present or else there would be no thread??

God bless,

Phil.

 

[CoryPad]

A roll tap does not produce swarf. It produces the thread by pushing some material in (to make the root/major diameter on an internal thread), which causes other material to flow out to make the crest/minor diameter.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[TVP]

Here is one of many links you can find on the internet to describe thread forming (rolling) vs. cutting:

http://www.osgthrane.dk/shared/guide-to-taps/tech-nuroll.pdf