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Post by Deleted on Aug 25, 2016 9:40:57 GMT
Thanks Jason
That is the one I have now sourced.
Rodger
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jasonb
Elder Statesman
Posts: 1,209
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Post by jasonb on Aug 25, 2016 10:14:10 GMT
MSC quite often have the inserts for those on special offer, I tend to use the 1.0mm neutral parting one quite often for grooving and recessing etc just as much as parting small work.
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Post by goldstar31 on Aug 25, 2016 11:02:35 GMT
Rodger
You have a PM.
Norman
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jem
Elder Statesman
Posts: 1,067
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Post by jem on Aug 25, 2016 16:21:11 GMT
A most interesting post. So here is my penny worth. I am at the moment making a rear tool post for my Warco 1236 lathe, why, well I agree with those about the tool moving back and away from the cut. but another reason for a back parting off tool post is that it can be set exactly at right angles to the work and left there. My front tool post is often being rotated slightly. As said the other good reason for the rear tool post is gravity assisted swarf control.
Now at the moment I am having a lot of trouble parting off with my front tool post. I can start cutting and all goes well for a while, then I get a dig in and the blade is snapped off, this has happened several times with the same blade, on inspecting the cut, I can see that a tiny bit of swarf has jammed down the side of the blade causing the jam. I am wondering if this is due to the blade being too brittle, or just me. I have had a Myford for 40 years, so I don't think it is just me?
best wishes
Jem
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Post by vulcanbomber on Aug 25, 2016 18:37:34 GMT
I'd be curious to know why rear parting off tool posts are considered a good idea. To me, they must surely try to lift the carriage assembly upwards until it's stopped by the keeper underneath. This sounds like totally wrong thing to do to me, but I guess it must work. I would have thought that the potential for chatter would be much greater because there must be some free play in between the keeper and the underside of the carriage. A parting tool at the front forces the carriage more firmly into the ways, so it's much stiffer. Perhaps it's the carriage lifting and unloading the tool that makes this work? It doesn't sound like it's good for the ways if the carriage is bobbing up and down all the time though. On a decent lathe there fantastic..... Used them many times for making washers faster than the CNCs will for short runs... Face and Part off in 1 smooth action.
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Post by andyhigham on Aug 25, 2016 19:32:31 GMT
I use a parting tool in the front toolpost and part off with power feed. I intend to fit a rear toolpost, not for a parting tool but for a 45deg chamfer tool to take corners off
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Post by vulcanbomber on Aug 25, 2016 19:52:09 GMT
I use a parting tool in the front toolpost and part off with power feed. I intend to fit a rear toolpost, not for a parting tool but for a 45deg chamfer tool to take corners off Your better to have a chamfering tool set in the front post ground up to do OD and ID chamfers from its normal set up... Then put it in the back of the box to chamfer either side of OD grooves.
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Post by goldstar31 on Aug 25, 2016 21:12:41 GMT
I use a parting tool in the front toolpost and part off with power feed. I intend to fit a rear toolpost, not for a parting tool but for a 45deg chamfer tool to take corners off You must have a very sophisticated Unimat. Mine's only a Taiwanese copy. Regards Norman
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Post by andyhigham on Aug 26, 2016 9:40:36 GMT
It's the larger version of the unimat. Made by Harrison and weighing in at around 600Kg
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Post by goldstar31 on Aug 26, 2016 10:01:34 GMT
It's the larger version of the unimat. Made by Harrison and weighing in at around 600Kg Do you have a spare copy of the Charles Atlas course to go with it? Laughingly Norm
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