Thread cutting

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Thread cutting

Postby Ms Wolffie » Mon Aug 13, 2018 2:31 pm

Do anyone know whether someone has ever done a gadget for thread cutting?
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Re: Thread cutting

Postby ger21 » Mon Aug 13, 2018 2:33 pm

Gerry - http://www.thecncwoodworker.com
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Re: Thread cutting

Postby FixitMike » Mon Aug 13, 2018 10:26 pm

I've used Paul Rowntree's Gadget. It requires a special thread cutter. Called a Single Profile Thread mill. Here's some, but I don't know about a down under source.
https://www.mscdirect.com/browse/tn/Thr ... 198214_c_S
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Re: Thread cutting

Postby PaulRowntree » Sat Aug 18, 2018 5:07 am

Were you thinking of a V-cutter on a 4th rotary axis?
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Re: Thread cutting

Postby Bobtail Farm » Wed Aug 22, 2018 4:19 pm

Paul:

i do/am (thinking of a v-cutter on a rotary) for a male thread on dowel. Actually, a v-cutter without the point to match an ACME thread... to create longer threaded dowel than i can get on my machine (z-limits). and a similar profile on a side cutter when using your gadget for the female threads
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Re: Thread cutting

Postby PaulRowntree » Wed Aug 22, 2018 6:09 pm

Bobtail Farm wrote:Paul:

i do/am (thinking of a v-cutter on a rotary) for a male thread on dowel. Actually, a v-cutter without the point to match an ACME thread... to create longer threaded dowel than i can get on my machine (z-limits). and a similar profile on a side cutter when using your gadget for the female threads
Brian.


There was a very nice example of this posted, the result was a beautiful bolt the size of your arm. Will see if I can find it. It should be a straightforward wrapped job (but I haven't done it). Others have made bench vises this way.
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Re: Thread cutting

Postby ger21 » Wed Aug 22, 2018 8:39 pm

You could hand code it in 3-4 lines.

G1 X10 A36000

will cut a 10" long 10tpi thread
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Thread cutting

Postby Bobtail Farm » Thu Aug 30, 2018 9:25 pm

thank you all, even though I think I "hijacked" the thread.
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Re: Thread cutting

Postby Tailmaker » Tue Sep 04, 2018 11:19 pm

Actually, no gadget required. The spiral ramp tool path does the job. That said, the generated g-code needs a minor edit to prevent to thread cutter from getting yanked out vertically at the end of the thread and making a groove (but even that would not ruin the thread altogether). The attached g-code was edited to do just that, i.e. move the bit away from the bolt and to the center of the nut before going back up. If Vectric would allow a lead-out move for spiral ramp tool paths that would probably be solved....


BoltNut1.crv3d
(2.02 MiB) Downloaded 154 times

BoltNutG-Code.zip
(8.76 KiB) Downloaded 128 times

Threads were cut with the Magnate 796 thread cutter bit (about $18). The file has a radial clearance of 0.1mm between nut and bolt but that is still a bit tight given the fuzziness of the wood surface. Some wax lubrication helps.

The new 9.5 version helical arcs option makes it even nicer but even before with many small linear movements it would work.
Attachments
DSC01384.JPG
DSC01387.JPG
DSC01390.JPG
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Re: Thread cutting

Postby Tailmaker » Wed Sep 05, 2018 12:08 am

Forgot to mention...conventional direction makes a right-hand thread while climb direction makes a left-hand thread.
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Re: Thread cutting

Postby Tailmaker » Wed Sep 05, 2018 2:13 am

Tailmaker wrote:Forgot to mention...conventional direction makes a right-hand thread while climb direction makes a left-hand thread.

That is true for the nut...For the bolt it is the opposite. climb direction makes a right hand and conventional direction a left hand thread.
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Re: Thread cutting

Postby John Murphy » Thu Sep 06, 2018 10:32 pm

HI Guys.
I've used Paul's gadget with great results.

I used a boring bar set to do the cutting https://www.busybeetools.com/products/h ... b3334.html

John
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20180906_172047-resize.jpg
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Re: Thread cutting

Postby crpoj13 » Fri Sep 14, 2018 7:25 pm

I too have used Paul's gadget and then I took info from it and ran it on my 4 axis rotary. I have plans to make a clamp vise on my work bench utilizing a large diameter screw, just for fun. Was unable to attach my video of me spinning the nut down the thread body. That thread body is 3 inch Pitch Diameter and .3125 Thread Pitch. The nut is 1 inch thick.

4 axis threading.JPG
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Re: Thread cutting

Postby Bobtail Farm » Sat Sep 15, 2018 9:52 am

crpoj13:
Neat. Any clues as to what/how you "took info from [Paul Rowntree's thread gadget]" to use in running a rotary toolpath? Interested to see how it might differ from Gert's suggestion (august 22nd) "hand coding" G-code.
It also looks like you used a v-bit. I've used a v-bit with smaller diameter threads with reasonable success. However, I've had it in mind for some time to use a flat bottom bit with 29 degree (if I recall correctly) sides to cut a ACME trapezodial thread on a larger diameter rod like you've done with the v-bit to use for bench vises and all sorts of applications where i use either a small diameter wood or metal (all) threaded rod.
Thanks in advance. And appreciate the inspiration - that project has been lagging on my list.
Regards,
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Re: Thread cutting

Postby crpoj13 » Mon Sep 17, 2018 12:30 pm

All I did was took values from the "Current Thread Description" window that populates from using the gadget. I use those min and max values for my diameters for the rotary work. Hand coding is fine as well, I just prefer to doing it via software. I am using a 90 degree V bit for the rotary work and a side 90 degree V bit for the vertical 3 axis work. I'm tossing around the idea of stabilizing the wood 1st, I am getting some movement due to humidity in my area that has caused the threads to tighten some over time.
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