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Carving Acme thread on the inside of a split nut.

PostPosted: Sun Feb 03, 2019 6:32 am
by JeffWimer
IMG_1850.jpg
I have been scratching my head trying to figure out how to model this in Vcarve. In the attached picture are images of the part I want to create. The part has a 5/8 x 4 tpi acme thread inside the cylinder. I am hoping someone can send me in the right direction to get this one done.

Re: Carving Acme thread on the inside of a split nut.

PostPosted: Sun Feb 03, 2019 7:30 pm
by Rcnewcomb
VCarve doesn't have the modeling capabilities for this. SolidWorks might be better suited for this type of modeling.

Carving Acme thread on the inside of a split nut.

PostPosted: Mon Feb 04, 2019 5:04 pm
by Bobtail Farm
you may also want to consider bits with an ACME (or near ACME) profile - side cutter for the inside of the nuts, and end mills for threads on a 4th axis. E.g., https://www.carbideanddiamondtooling.co ... .Series.35 and https://www.whitneytool.com/Product.aspx?ID=5536 by way of examples.

Re: Carving Acme thread on the inside of a split nut.

PostPosted: Mon Feb 04, 2019 8:44 pm
by Leo
Using the cutters that bobtail linked to is what you need.

You cannot model that in V-Carve or for that matter even in Aspire to my knowledge.

I think there is a threading gadget somewhere, but I don't know where.

I have never tried it, but I am pretty sure this would work.

It's a pretty easy combination of x-y motions Either G2 or G3 with a Z added in for the pitch.
It's not something in Vectric - it is straight G-Code.

I will play a little tonight on my machine.

Carving Acme thread on the inside of a split nut.

PostPosted: Mon Feb 04, 2019 9:18 pm
by Bobtail Farm
Also, Paul Rowntree's gadget works for the internal threads, and for short (at least with the z capacity on my machine) external threads. On this forum generally there are comments on threading using rotary, if memory serves one such author was/is Ger21. And the method was simple g-code in Mach3.