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Advice on a CNC for cutting internal threads


We are a small shop and have been considering a cnc router for some time now. We were about to pull the trigger on one when we picked a new client that requires threaded rods and nuts made out of wood. The rods are one inch diameter with nuts to match. This is repetitive business but not substantial in amount. We currently use wood threaders and taps but this is time consuming.
Does anyone have any experience or advice on purchasing a router that has the capability to cut internal threads or should we be looking at two separate machines?

7/12/18       #2: Advice on a CNC for cutting interna ...
Tom Gardiner

V-carve Pro software has an add on software gadget to cut internal threads with side cutting v bit. Virtually any cnc machine will do that. For the male threads you will want a 4th axis, essentially a lathe setup with headstock turned by a stepper or servo motor. Several machines offer a 4th axis. Again V carve can take care of the programming.

7/13/18       #3: Advice on a CNC for cutting interna ...
james e mcgrew Member


Camaster has several sizes with a well established rotary cutter on any machine. there are some who do what you want already on the camheads forum

7/13/18       #5: Advice on a CNC for cutting interna ...

Thanks for the responses. Our biggest concern is whether or not I can do internal threads on a one inch nut. I would like to see one being cut before we purchase a machine. We have been looking at machines but most suppliers don't have the capabilities to demonstrate this.

7/13/18       #6: Advice on a CNC for cutting interna ...
james e mcgrew Member


Show US or send me a photo of the end product !

7/13/18       #7: Advice on a CNC for cutting interna ...
james e mcgrew Member


I am no expert as i have no reason to make this, I have seen it done, in the last few seconds i did make the file. the inside thread would just have to be programed in a gadget, might take me a few more minutes but i gotta get to work !

View higher quality, full size image (971 X 788)

View higher quality, full size image (819 X 725)

7/13/18       #8: Advice on a CNC for cutting interna ...
Dropout Member

What your looking for is called thread milling.

Are you making the entire nut of threading a blank?

7/13/18       #9: Advice on a CNC for cutting interna ...
Dropout Member

Can use a single point or multipoint tool.

7/13/18       #10: Advice on a CNC for cutting interna ...

Do you think you will be able to tap the threads in the nut faster on a CNC than a 1" NC tap? Dropouts video shows the way it is done on a milling machine. Those will be for high tech parts where you have unique tolerance spec (expensive). You need to pay close attention to the fixture they are using and then think about the quantity you need to make. If you are talking very small quantities (say <10 - 20 per run) then this might work, but if larger quantities are needed I am not sure you will be happy with the speed of a typical 3 axis CNC. It would eliminate the manual labor, so that might what is most important to you.

If you want to see how they fixture larger batches of unique small parts in the milling world this link might give you some ideas what is involved:

I am not sure if the process to thread the dowels will be incredibly fast either on a CNC with a 4th axis. If you can accurately locate a 1" rod and simply mill in the threads, maybe, but I would be doing some research if this is important to you before plunking down money for a fourth axis.

It is easy to think you can do endless things with a 3 axis CNC, and honestly with ingenuity you can in many cases. The question comes down to, does it make good sense for a business application?

Are you sure there is not a supplier out there to supply this part? Markup on a supplied item works out well for some products.

These guys have threaded rod, but no nuts. This link is for 3/4", but I bet they could supply 1".

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