Messages

851

General Mach Discussion / Re: Physical buttons for plasma

« on: November 28, 2016, 03:26:27 AM »

Forgot you are on a servo, maybe its not so critical, stepper driven ones need the coarse pitch so moves only require a step or two to complete - no acceleration/deceleration etc.

Maybe servo does not need it so coarse?

852

General Mach Discussion / Re: PowerMax30 THC - DIY with MACH3

« on: November 28, 2016, 02:24:25 AM »

Look into the Proma THC - its budget and probably your best option i think.

You have to connect into the live torch feed which needs to be carefully done as high voltage.

It provides the arc-ok signal.

Connects to Mach3 via inputs on the breakout board.

853

General Mach Discussion / Re: Physical buttons for plasma

« on: November 28, 2016, 02:21:55 AM »

What screw pitch do you have on Z?

Needs to be coarse - mine is 10mm i think.

854

General Mach Discussion / Re: Just when you think you are finally getting there....

« on: November 27, 2016, 05:05:29 PM »

What settings should the mill have for CV distance and stop cv on angle boxes??

At present CV distance is turned off in my screen set and there is no cv angle box at all (2010 screen set) but i guess it still has a value set somewhere?

855

General Mach Discussion / Re: Physical buttons for plasma

« on: November 27, 2016, 04:24:25 PM »

Some nice looking cuts there, it really begs for a dead-band setting though

856

General Mach Discussion / Re: Just when you think you are finally getting there....

« on: November 27, 2016, 12:33:01 PM »

No, BC is turned off on this setup.

I don't think Vectric can do the trickery sheet cam can.

857

General Mach Discussion / Re: Just when you think you are finally getting there....

« on: November 27, 2016, 09:32:12 AM »

Ok, thats complex. But what does it mean to my issue?

Do I just need to whack the acceleration up, retune the servos and test?

What sort of figure would I need to aim for?

858

General Mach Discussion / Re: Just when you think you are finally getting there....

« on: November 27, 2016, 08:31:50 AM »

Bull or not, it's above my math grade

But what does it all mean?

Surely if the mathematical rounding is 0.8mm and my physical rad is 1mm i should be good to go as machine rad < cutter rad ? If i had a machine rad of say 5mm and a cutter rad of 1mm then i would expect to see a 5mm radius regardless of tool dia??

Clearly i have something not set right?

I doubt the servo tuning has any input here as the following errors are lower now than before.

859

General Mach Discussion / Re: Just when you think you are finally getting there....

« on: November 27, 2016, 08:00:30 AM »

Its set at 3500mm/min and 350mm/s/s on X&Y with 2000mm/min and 750mm/s/s on Z

860

General Mach Discussion / Re: Just when you think you are finally getting there....

« on: November 27, 2016, 06:41:32 AM »

Ok, so what's not right here?

Cut some 5mm Alu on the high-speed spindle yesterday and it looked ok i thought, confidence was restored

Went out and did another part today, same file, but results looked poor and scrutinising yesterdays work closer it seems the fault was there too but not quite as pronounced.

it looks like the toolpath on the finish cut is pulling away from the corners too soon - corner rounding??

The finish tool is a 2mm single flute carbide at 23000rpm, 1000mm/min feed.

Not sure why todays was worse than yesterday although the machine was slightly warmer yesterday as this was the second job run.

Great care was taken when doing the CAD&CAM to get the tool right into that corner to give a 1mm radius

The surface is actually smooth - the rough look is swarf stuck with cutting fluid;)

I did do some major servo tuning but have not altered speeds or acceleration in motor tuning.

What could do this, any suggestions?
These parts need to be accurate