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3 Attachment(s)
The threading tool arrived yesterday and I had a chance to look at it today. I thought that coming out of the US, the holder was another American device, but looking at the inserts, they are branded "Germany". I did find RB tools doing a web search but they were making card equipment so didn't seem to be the same people. Possibly they are.
Attachment 345551
In this selection I got 4 tools - two 60 degree inserts, an 8tpi acme insert and what looks to be a 4 pitch trapezoidal insert. The holder has metric fasteners on it but also some UNC - perhaps the fasteners were replaced when damaged by using the wrong size spanners in the US?
Attachment 345552
Duplicating the insert backs will be interesting. The grooves are 1mm pitch and inclined at a 17 1/2 degree angle. I imagine the angle of inclination is there to push the insert back into the holder
Attachment 345553
I did think that for a look alike small enough to fit my lathe (the holder height on this is 1 1/2" - RC if you ever buy that 15000mm BC lathe I may have a holder for you) I may be able to do it by mounting inserts in a carrier and pretending I'm cutting a thread on them.A normal M6 has a helix angle of around 3 degrees so for an insert say 25mm front to back I would need to do a 24 start thread to get a similar angle for that pitch. It may have to be milled although with a metric mill that should not be too bad if say 5 or 10 are racked up together.
Michael
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Hi Micheal,
Does the clamping plate have matching grooves?
Stuart
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It does. It's a trapezoid shape with a plain back. The grooves locate on the insert and the plain back surface pulls in against a ramp surface on the tool.
Michael
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Hi Michael,
Very interesting threading tool. Do you think it would be easier to make the tool out of say 4130 enabling you to use a shaper to cut the fine grooves and then braze a piece of square HSS / carbide into it as the cutting edge. It looks like the body of that tool has had a second life as a hammer, some machinists are rough.
Bob