Parting with the rear tool post

Cliff Coggin · 2008-12-24T10:36:48+00:00

I vaguely recall arguments that parting off from the rear tool post with the tool upside down is beneficial, but for the life of me I don't remember why. Naturally the swarf can escape the cut easier but I am sure there was another reason. Can anybody enlighten me please?Cliff Coggin.

Dec 24, 2008 22 Replies

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John 17 years ago

Cliff

As someone who has fitted a rear toolpost, mostly used for parting off, I can confidently say they are worth the effort. I fitted a long T slotted cross slide mainly so I could fit a rear toolpost and it has been worth every penny.

On my elderly lathe, before I fitted the rear toolpost I often broke parting off tools and I had to reduce speed to part off successfully.

Since fitting a rear toolpost I can part off at the same speed as I am using to turn a part and 'touch wood' I haven't broken a parting off tool in years. The theory is right, dig ins reduced dramatically, parting off is easier..

John

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Russell 17 years ago

I considered buying a Q-cut - but as a beginner my experiences with carbide tooling have been expensive - indeed I recall threads here on how HSS was a benefit.

I had no desire to spend money on an expensive tool if it was likely to go the way of my other parting tools.

So I recently made a rear toolpost and at the first test parted off half a dozen discs from a 1" bar which i hadn't managed to do from the front at all.

Perhaps now I'll think about a Qcut again and put it at the back.

Russell

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Nick Mueller 17 years ago

Now you know why they are called *parting* tools. :-))

Nick

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