denford triac rigid tapping

[m_c]

Are you sure your spindle only goes one way?
I'm pretty sure mine had a reversing relay, but I've not got the wiring diagrams handy to check.

For rigid tapping, you need reasonably accurate spindle control, along with accurate positional feedback, which the original DC motor definitely doesn't, and I'd suspect a VFD may struggle to respond fast enough, plus you'd struggle to fit a normal AC motor.
I fitted a 110 frame 1.25kw servo motor to mine, which involved making up a quite substantial adapter (I do have a thread on here with details/photos), as space is very limited.

I've still not got as far as trying rigid tapping, but that is one of the reasons I fitted the servo, instead of repairing/replacing the original motor and drive.

[battwell]

theres no reversing contactor in mine. just forward run
the spindle doesnt have to run accurately- just at rough speed required as the z axis will be geared to its encoder (which il have to add) - so will only start back out movement when the spindle is in reverse in a tapping cycle .
i havnt had time to test the lynx drive fully yet- but its ready light is on !
it does look a tight for space fit- was thinking mounting the motor high with a long shaft where the original motor is now if i have to use an ac servo instead.
time for some testing.

[m_c]

You need accurate enough spindle control so that you can stop it within a reasonable tolerance, unless you plan on having a very wide tolerance on tapping depth.

To give you an idea of the space problem, this is a 110mm square plate which the servo motor bolts to on top of the spacer -


The spacer is high enough to get reasonable bearing spread between the two support bearings for the extension shaft, and a flexible coupler.
I have a model of the Triac head casting in Fusion360 if you want to see what will work.
IIRC you could probably get a 130 frame motor on, if you wanted a bit more power.

[m_c]

This post onwards covers the servo and the mount - http://www.mycncuk.com/threads/10344...9732#post89732

[andy_con]

Got some tapmatic tapping heads for my triac, work a treat

[battwell]

as uccnc fully supports rigid tapping- and others are using it daily id like to add it to the triac.
if i run into problems- il go with tapping head .
to be fair with the amount of real paying work i have its going to be a while before the new "hobby machine" gets done.

[andy_con]

Is it really worth the cost and effort, use threadmills

[PaulMucCNC]

Are you sure your spindle only goes one way?
I'm pretty sure mine had a reversing relay, but I've not got the wiring diagrams handy to check.

For rigid tapping, you need reasonably accurate spindle control, along with accurate positional feedback, which the original DC motor definitely doesn't, and I'd suspect a VFD may struggle to respond fast enough, plus you'd struggle to fit a normal AC motor.
I fitted a 110 frame 1.25kw servo motor to mine, which involved making up a quite substantial adapter (I do have a thread on here with details/photos), as space is very limited.

I've still not got as far as trying rigid tapping, but that is one of the reasons I fitted the servo, instead of repairing/replacing the original motor and drive.

I have a 1990 Triac, i want to change the spindle motor aswell. Did you change the complet fanuc mainboard, or just huck the new servo in the fanuc system? It would be great if you show me how you did it.

I hope on your reply

best regards

Paul

[battwell]

most of us have put newer easier to manipulate controls in. hacking fanuc stuff is hard work!
mine is running uccnc on uc300eth motion controller.
if you can find an 80 frame size servo for spindle it will bolt straight on with a adapter plate.

[PaulMucCNC]

Okay thanks. Did you keep the other motors? I have fanuc servomotors they work pretty well is it possible to keep them or is it better to throw all out and put a new controllboard and servomotors and drives inside?

Thanks a lot for your support.