Centroid Community CNC Support Forum

Richard,

if the umbrella is moving to the spindle it is hitting the stop hard.

Is the air cylinder with adjustable dampening?

Uwe

Marc, thanks for checking out the video. Yes, I miss-spoke on the video, I meant to say that T1 is in the spindle, not in the carousel.

I watched it a few more times and you are correct; the sequence does indeed look right. Yes, the drawbar is clamping an unclamping as needed. I guess the thing that surprised me a bit is that there is virtually no delay from the time the carousel is extended, to the time the z-axis moves up. I guess I expected a slight pause.

Is there a way to slow down the entire sequence so that when I am mounting the ATC and adjusting the position of the ATC with respect to the spindle, I get a chance to stop it if it is not looking right? I tried slowing down the feed rate on CNC12, but it had no effect on the Z-height retract speed.

Uwe, the air cylinder I used is from McMaster item 6498K831 (https://www.mcmaster.com/catalog/131/1275/6498K831). It has an operating force of 90 lbs. when supplied with 100 psi. I am only feeding it about 12 psi. I am not sure how to dampen it. Can I put a small valve on the exhaust to slow it down. Something like this:

https://www.amazon.com/gp/product/B07DP ... Y5G6&psc=1

Or do you think this would give better control (not sure if it will work with the air coming form the 1/8" NPT side:

https://www.amazon.com/gp/product/B07S2 ... WZ5XM&th=1


Thanks as always... Richard

I would use one with cushioning adjustable on both sides like this one:

https://www.esska-tech.co.uk/shop/FESTO ... 6125001056

They can be adjusted for smooth stopping even on full pressure.

Uwe

Thanks for the suggestion... Appreciate that very much.

Going back to the original question... Do I have to make changes to the M6 macro... Since it appears to have the logic to make sure the spindle is not turning. I don't understand why there are several M6 macros.

Thanks.. Richard

There are M6 templates from the probe APP, but if you issue M6 only the mfunc6.mac will run.

To make sure the spindle is not turning there are several options

- use an input and wire the zero speed output from the servo driver
- use the PLC edit marc suggested
- use instead of M101 /70014

Uwe

You can also use some of these hydraulic cylinder shock absorber to dampen it

https://de.aliexpress.com/item/40011434 ... in_prod%3A

Uwe

You can use an inline needle valve in the air line to slow the cylinder also. I add delay's in mine for clamp time and things like that. G4 P.5 will give you a half second delay.

cncsnw wrote: ↑Mon Sep 01, 2025 2:28 pm As far as I can tell, a standard Acorn PLC program sets MEM14 "SpindleZeroSpeedState_M" based only on the "VFDZeroSpeed" input, if any.

I do not see any reference to the spindle encoder or SV_MEASURED_SPINDLE_SPEED.

You could, of course, replace:

Code: Select all

IF VFDZeroSpeed THEN (SpindleZeroSpeedState_M)

with

Code: Select all

IF ABS(SV_MEASURED_SPINDLE_SPEED) < 10 THEN (SpindleZeroSpeedState_M)

But that will only work if you have a spindle encoder, have it properly configured, and have set bit 0 of Parameter 78.

Tested this out, perfect, even with a status message.

Next thing was to figure out why it is working with no SV_MEASURED_SPINDLE_SPEED in the PLC....

It is explained in the PLC manual, I should read there more

Uwe

Ken Rychlik wrote: ↑Tue Sep 02, 2025 6:09 am You can use an inline needle valve in the air line to slow the cylinder also. I add delay's in mine for clamp time and things like that. G4 P.5 will give you a half second delay.

This way will slow down the whole travel, that is why I prefer only dampening near the end of travel...
.. fast and smooth like the Centroid s-curve on the axes

Uwe

Sorry, I am a little lost with the suggested changes.

I have attached the standard mfunc6.mac file that resides on my CNCM directory. I read your suggestions for how to modify this file but got lost a bit.

The attached mfunc6.mac file already contains "M101 /70014 (see screen shot). This file is dated 10/2/2023. If it is different in the new CNC12 5.40, I will wait for it to come out before making changes.

I currently have Parameter 78=0

Can you please indicate what needs to be changed in this file. Thanks for your patience.

Best... Richard