Chris Stevens’ parting tool

[TerrydParticipant @terryd72465]

Hi all,

Here are a few pictures of the tangential parting tool made by Chris Stephens, I took these at the Sandown show today 2nd November 2012. The show appeared to be a little sparse this year but it may have been my perception but I didn't see any of the major machine dealers. Enjoyable all the same as I wasn't out to add to my machine collection.

I tried to get a few different views to give an idea of the tool. Sorry but I forgot to add a size reference but at the time I got there it was a little busy.

Hope these are ok

Best regards

Terry

[TerrydParticipant @terryd72465]

[TerrydParticipant @terryd72465]

Hi Again,

While there I was introduced to another type of parting tool by a member of SMEE (whose name I didn't get – much to my shame) the rear end of the parting bit is allowed to float a little in its groove while it is clamped in the front half. The rear half of the tool is clamped into the tool holder and if the tool tries to dig in the front half deflects by the dint of the central split thus preventing dig in, but is then pulled back by the natural spring in the metal.

I thought you might be interested. I'm sorry about the quality but it is actually a picture of a picture

 

Best regards

Terry

Edited By Terryd on 02/11/2012 17:16:14

[Clive HartlandParticipant @clivehartland94829]

Thats a quite neat looking tool Terry, thanks for posting the pics.

Clive

[TerrydParticipant @terryd72465]

Hi Clive and all,

I forgot to mention that the pictures are clickable

Terry

[keithmartParticipant @keithmart]

Hi

Excuse my ignorance, but what advantage would the tangental tool be, say on a mini lathe?

Regards

Keith

Leeds

UK

[michael howarth 1Participant @michaelhowarth1]

Thanks for the excellent pictures Terry. What is the toolbit angle Chris?

Mick

Edited By mick H on 02/11/2012 19:14:29

[KWILParticipant @kwil]

Terry, The owner of the other parting tool was Maurice Fagg

[Sub MandrelParticipant @submandrel]

If you can get the HSS that's pre-ground to be narrower at the bottom than the top, then using it on one of these would give you side clearance, which is nice

With ordinary HSS, the only possible advantage would be if, like teh old swan neck holders, it tends to swing clear rather than dig in.

Proof of pudding in the eating.

Neil

[TerrydParticipant @terryd72465]

Hi All,

I forgot to say that the pictures are all available in my photo albums for those interested, and thanks KWIL I should have remembered that, it was a real pleasure meeting him and yourself at the exhibition.

Regards

T

[Russell EberhardtParticipant @russelleberhardt48058]

Posted by Stub Mandrel on 02/11/2012 21:37:30:

If you can get the HSS that's pre-ground to be narrower at the bottom than the top, then using it on one of these would give you side clearance, which is nice

That's a good point. I have always found that parting tools ground on the end of a HSS square work better than the standard bought tools as I can give them adequate clearance. Could this also be why the inserted tip types seem to work so well?

Russell

[Alan JacksonParticipant @alanjackson47790]

I found that with my vertical parting tool it needed side clearance in the vertical plane as well as in the horizontal. With no clearance in the vertical small chips can get dragged and wedged in the decreasing side clearance between the vertical sides of the tool at the exit path of the tool and metal being parted. Once I made clearance in both directions it all worked well. http://www.model-engineer.co.uk/forums/postings.asp?th=67935

Regards

Alan

Edited By Alan Jackson on 06/11/2012 10:41:11

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