feedrate override using rotary momentary switch?

[paulus.v]

I am also interested how a pot will do the feed override. The CSMIO IP has this function in their plugin but as I understand from their manual, you have to decide whether to use the mach3 feedrate or the manual pot. I cannot imagine a way to do the override (+/- of the mach3 feed value) with a pot.

[JAZZCNC]

I am also interested how a pot will do the feed override. The CSMIO IP has this function in their plugin but as I understand from their manual, you have to decide whether to use the mach3 feedrate or the manual pot. I cannot imagine a way to do the override (+/- of the mach3 feed value) with a pot.

Yes that's correct and it's easy. The analog connector provides 10V for the pot and you feed it back into the analog input. The control then overrides feedrate or Spindle speed based on the returning voltage.

[paulus.v]

Yes that's correct and it's easy. The analog connector provides 10V for the pot and you feed it back into the analog input. The control then overrides feedrate or Spindle speed based on the returning voltage.

I missed the important part, that the pot controls the override not the actual feedrate value, hence the confusion.

routercnc, sorry for hijacking your thread. I'm curious to see what controls you think are important to be put in the front panel.

[routercnc]

routercnc, sorry for hijacking your thread. I'm curious to see what controls you think are important to be put in the front panel.

No problem Paulus - it was all the same theme.

Here is an artists impression of my latest version. Switches are all on order but due to Chinese new year will be mid to end March before they arrive.



Still a bit of tidying up to do but you get the idea. The up/down triangles for the feedrate override would now be a simple pot, same as the spindle speed pot.

Thanks

[routercnc]

Can anyone help with the following question. You'll notice on my new panel design the digital readout below the spindle on/off switch and the idea of this is to show the spindle rpm.

This is a voltmeter and I intend to connect it to the V0 and ACM pins on the VFD. See bottom right hand corner.


I haven't connected it yet but suspect that at maximum 24,000rpm it will read 10V and 0rpm will be 0V. I've looked into this but not found anything yet to confirm. Probably because the rpm is shown on the VFD and most people look at that but mine will be covered in the new enclosure.

I'd like to make it show 24V = 24,000rpm if possible. Can this be done? I looked at DC/DC convertors but I think they give a fixed output rather than a tracking one. Any other way?

If not then I think I can go the other way and make it read 2.4V = 24,000 rpm by using a pair of resistors in series, sized to drop the 10V to 2.4V across the top resistor, and reading across the lower one to ground. Should this work?

I'm not looked for complete accuracy but nearest 1000rpm would be fine. Any ideas?

[Clive S]

If its one of the Chinese VFD's the front panel just clips out and you can fit it on the outside of the box.