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Parting Off With an Interrupted Cut - Is it a daft idea?

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Muzzer	20/09/2017 12:39:47
2904 forum posts 448 photos	I'd part it off so the tool straddles both sections, round and lumpy, only just shaving the lumpy bit. Ideally you'd have thought of this and dimensioned it accordingly. That way the tool and cross slide etc will remain constantly loaded - and you won't have any finishing off to do either. It's not so much the insert that is the problem as the backlash and spring in the machine between the work, all the way round the machine through the spindle and bed and finally back to the tool and the insert. Murray
Mick B1	20/09/2017 14:32:26
2444 forum posts 139 photos	Posted by Muzzer on 20/09/2017 12:39:47: I'd part it off so the tool straddles both sections, round and lumpy, only just shaving the lumpy bit. If you do that, there'll be side loading on the tool from the chuck side, and by the time you hit the lumpy bit, the blade will already be deflected rightwards. I've always thought you need to equalise the load both sides of the parting tool to get a straight plunge - and if you don't get one o' them, there are several undesirable possibilities, depending on exact circumstances...
mark costello 1	20/09/2017 20:31:15
800 forum posts 16 photos	Parting tools are regularly ground at an angle to either leave the pip on the part, or leave the pip on the remaining stock.

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