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23rd April 2015, 07:39 PM #46Philomath in training
- Join Date
- Oct 2011
- Location
- Adelaide
- Age
- 59
- Posts
- 3,148
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.
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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?
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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
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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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23rd April 2015, 07:48 PM #47GOLD MEMBER
- Join Date
- Jul 2010
- Location
- Melbourne
- Posts
- 7,770
Hi Micheal,
Does the clamping plate have matching grooves?
Stuart
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23rd April 2015, 07:50 PM #48Philomath in training
- Join Date
- Oct 2011
- Location
- Adelaide
- Age
- 59
- Posts
- 3,148
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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23rd April 2015, 10:46 PM #49Senior Member
- Join Date
- Apr 2009
- Location
- Ballina N.S.W.
- Posts
- 371
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