Is it possible to run a 4th (rotary) axis from a Triac?

[g-speed]

Is this possible or would the machine need modifications. It has an NUM operating system

[Steve]

The Denford 4th axis would not interface with the NUM control.

There may be somthing out there that will but I am sure it will be expensive.

[Multispool]

Well, if you intend to convert the machine to mach3 then it would only need the installation of the the 4th axis hardware.

Just how professional to you want it to be? have a look at the small vertical rotary tables around. I have this idea of finding a good quality one and extending the center spindle behind the casting using an extra end bearing to hold better alignment. Use a stepper with a stepmaster driver and a reduction belt drive should be an easy solution!

I'll share how I go about it, but its not at the top of the list of priorities at the moment! cool idea though...

[Denford Admin]

I'm sure the NUM is a very capable control (even though it is French )
The problem would be finding the necessary parameters and logic to enable a 4th axis on the NUM (I seem to think the NUM logic was in assembler at one time ?) - even then, do you have the hardware ? ie, encoder port and analogue output ? Like Steve says, this would get expensive unless you can find a NUM spares dealer (who will probably be able to advise on adding the 4th axis as well)

PS - can Mach control "proper" closed-loop servo machines ?

[Multispool]

PS - can Mach control "proper" closed-loop servo machines ?

I had a quick play with Les Newell's Bridgeport which has closed loop servo control with mach3 running, and very nice and responsive it was too.

Not sure if that is out-of-the-box or if a plug-in was written.