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Parting off

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petro1head29/07/2019 12:44:12
730 forum posts
143 photos

Is there any way to stop getting a lip when parting off

part off.jpg

Phil P29/07/2019 12:56:13
592 forum posts
164 photos

Yes, you can grind the nose of your perting tool so it has a very slight angle to it. That way the leading edge will break through first.

You will then leave the lip behind on the parent bar. And then follow through with the cut to remove it.


petro1head29/07/2019 13:04:32
730 forum posts
143 photos

Ah right, thanks

I use index tools so I think I will not be able to grind it

JasonB29/07/2019 13:07:40
17088 forum posts
1839 photos
1 articles

You can buy left hand, neutral and right hand inserts, expect you have neutral (GTN) so get the others GTL or GTR depending on what side you want a cleaner parting cut. Just be aware that if you have a lot of the holder extended then the angled cutting edge can throw the blade off to one side.


Edited By JasonB on 29/07/2019 13:09:52

petro1head29/07/2019 13:33:24
730 forum posts
143 photos

I managed to gring an angle on a tip. Works a treat. This is just for parting delron


Edited By petro1head on 29/07/2019 13:33:43

mechman4830/07/2019 08:39:04
2551 forum posts
385 photos

I have a HSS one specifically ground as Phil P mentions, works a treat on all jobs / material. I also use an insert tip tool, 2mm for majority of jobs and a small grooving tool 1mm tip that I ground up on a small 8mm HSS piece of tool steel.


Howard Lewis30/07/2019 13:21:55
2749 forum posts
2 photos

I grind my parting tool at a slight angle. The advantage is that the back of the work should be free of a pip or "sleeve". But it does impose a sideways force on the tool, and the swarf is wider than the groove that is being made. This can lead to swarf jamming., and dig ins

With the tool mounted inverted in a back toolpost, this is less of a problem, as the swarf tends to fall downwards.


AdrianR30/07/2019 15:43:41
274 forum posts
20 photos

This is a good video about parting tools, **LINK**

I find all Joe's videos worth watching

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