Yet another Techno Isel Lathe Refit Using Centroid Acorn and Teknic Clearpath Drives

[martyscncgarage]

They clearly did not have room for the VFD in the enclosure. Separating it is not a bad thing.
There are schools of thought on grounding VFD cable. I take the shield and the ground of the VFD cable and ground it to both the motor ground and the VFD ground point. Belden wrote an article about this. Search for Belden in the search box.
Yes use a braking resistor and try for 3 seconds accel/decel start there.

Keith may chime in with more details. I think somewhere he gave the setting they used....

Grounds to one point, all back to where the power cable ground comes in, yes, I ground the buss to the back panel but run all shields and insulated grounds back to that buss.

Marty

[carbuthn]

Thanks for your time Marty, you have helped me a lot. My AC Tech VFD appears to be good but I am going to put the new GS2 VFD in to get the new features and keypad for ease of programming.
Chuck

[tblough]

If you have a cam-lock chuck you should be fine adding a braking resistor and dropping those accels down to 1 second or so. If you have a threaded chuck or a bayonet mount like my Hardinge, you need to be careful that you don't unscrew the chuck with a fast decell.

[carbuthn]

Thanks Tom,

I have the threaded chuck on the lathe. I was worried about breaking taps when ridgid tapping that the chuck would not stop fast enough.

I had not considered unscrewing the chuck from the spindle. I will stay with 3 second acceleration / deceleration for now. If I have a problem I will add the braking resistor and change the rates.
Chuck

[martyscncgarage]

Keith taught me to use machinable wax while testing this. It will let you test, not break taps and the wax is firm enough to test your threads.
Just don't over crank on the chuck....
Marty

[tblough]

You won't break taps. Regardless of your spindle braking times, the controller looks at the actual spindle speed and coordinates the Z movement to synchronize with the thread pitch. With longer braking times, you just end up with a longer tapping cycle time.

[carbuthn]

Good to know Tom, I am ordering some machinable wax to play with also.
Chuck

[tblough]

Yup, wax is the way to go. viewtopic.php?f=64&t=2946 is where I did the setup of rigid tapping on my will. The real test with wax is peck taping and then check the thread form in the wax part. The threads should be crisp and clean with no tearout. If the tap can enter the same thread multiple times and still leave the first thread intact, you've got everything set up correctly. Good luck!

[carbuthn]

I have looked/searched everywhere I could think of, but can't find the difference written down between HomeAll and LimitAll. I assume the HomeAll switches are used for homing to stop travel and then back off 0.050" and zero the position readings. And that LimitAll will just stop travel anytime the switch makes contact.

1. Do I need to have separate switches for both HomeAll and LimitAll or can I use one set of switches for both the HomeAll and LimitAll inputs?
2. Can I use just HomeAll and set Soft Limits?

Thanks,
Chuck

[martyscncgarage]

Home all is for home switches one on each axis series together. It allows CNC12 to home each axis with one input.imit all is for switches on the OPPOSITE end of each axis series we together for the sole purpose of stopping any axis if any switch is tripped.

Truth be told I use home all and soft limits. Works great.
Marty