Newbie with Soba parting tool question

This topic has 7 replies, 5 voices, and was last updated 24 May 2012 at 23:14 by David Littlewood.

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23 May 2012 at 21:25 #91457
MattK
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@mattk47317
Hi,

This is my first post on here. I have a Myford S7 Mk1 which I have been playing with for a few months. I have already got some great advice from this site but I have hopefully a simple question.

I recently bought a clamp type parting tool from Chronos that states it is compatible with a Myford like this one **LINK**

I can't get the cutting edge to centre height. I have a dixon type toolpost and it sits maybe 2mm too high in the lowest position. Also in a (non genuine) rear toolpost it is in the wrong position. Has anyone got one of these and experienced similar issues? TIA

Matt
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23 May 2012 at 21:25 #6166
MattK
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@mattk47317
23 May 2012 at 22:49 #91459
Francis Sykes
Participant
@francissykes95134
I have a similar parting tool – just bought from RDG.

It has a 9mm shank – and I had to make some packing to get the centre height correct – I have a home made single toolpost arrangement that merely clamps the tool to the compound slide. I just milled off some 3mm aluminium to make it the correct height.

I guess that doesn't help you too much, if you need it lower then perhaps mill off 2mm off the bottom of the shank?
23 May 2012 at 23:10 #91460
David Littlewood
Participant
@davidlittlewood51847
Matt,

Can't help you on that specific tool I'm afraid. For many years I struggled with parting tools of that general type – they worked, but it was always a slightly nerve-racking experience with steel of any size. Then I bought one of these **LINK** and it was a revelation, an order of magnitude better than any other I have tried. It works well because it curls the swarf into a shape narrower than the groove being made. I bought it after seeing a demo at the Myford factory of someone parting off under power feed at a non-backgear medium speed; magic! Treat yourself.

Oh, and I can confirm that it fits in my Dickson toolholder system (on a S7) with no problems.

David
24 May 2012 at 09:27 #91469
Chris Trice
Participant
@christrice43267
I've got that exact same one as David and can vouch that it's probably the best type out there too.
24 May 2012 at 09:54 #91471
blowlamp
Participant
@blowlamp
The Greenwood Tools parting system is good, as is the one from JB Tools and I find them roughly equal in their capabilities. However, the cost of the inserts from Greenwood Tools is high in my opinion, so I source from either JB Tools or from here

Martin.
24 May 2012 at 22:46 #91524
MattK
Participant
@mattk47317
Thanks for the recommendation for the parting tool. David, I take it from your post that you part off from the front then? I have quite a long list of bits I still need to get but I have stuck this one on my list and will take a mil or so off the shank as suggested to see if I can get it to fit in the meantime. My main issue was it is advertised as suitable for the Myford but I can't see how it would fit.

I also have a short bit of HSS I got already ground that my uncle gave me and I have had good results from the rear toolpost but it is quite short and can only part about 3/4". One thing I found was that it pays not to be timid, and seemed to work better when I kept the feed going rather than hesitating.
24 May 2012 at 23:14 #91526
David Littlewood
Participant
@davidlittlewood51847
Matt,

Yes, I use it mounted at the front; I never really subscribed to the rear toolpost thing. You are right not to hesitate; like all tools, they work best when actually cutting, and in fact letting them rub is a major cause of blunting the tool. I find dripping a little neat cutting oil every 10 seconds or so (for steel) is quite enough

David
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