Messages

1841

General Mach Discussion / Re: Physical buttons for plasma

« on: March 31, 2016, 05:57:38 AM »

Nice

That is a pretty rigid gantry there, while you have the lasers, sling some weight on or under the gantry to represent the Z axis & motor, torch, cables, etc then try the same test with the load parked at different points of X from left to right

1842

General Mach Discussion / Re: PWM output...

« on: March 28, 2016, 12:26:30 PM »

I have now measured the 0-10v signal but only by disconnecting the VFD?

Odd.

Is the a way of editing linearity.dat manually?
Does anyone know whats in it?

I have listed volts to speed requested now and also speed requested to speed obtained.

Obviously i can use a manual lookup table but thats  not the point

1843

General Mach Discussion / Re: Physical buttons for plasma

« on: March 28, 2016, 03:21:42 AM »

Yep, been there. The X axis on my table was double-width HiWin rail so two rows of parallel screws, drilled and tapped each blasted one of them

1844

General Mach Discussion / Re: Need Info

« on: March 27, 2016, 04:25:42 PM »

Just an FYI, thread forming cutters are generally only used in soft metals like aluminium, generally you would cut a thread in steels.

I think the code for a delay would be G04 P15.00

1845

General Mach Discussion / Re: Physical buttons for plasma

« on: March 27, 2016, 04:22:26 PM »

Interesting experiment would be to mount a laser pointer on each end, facing the far wall, dots close together then swing the gantry and watch the dots wobble in different directions

It may look rigid but plasma will show a deficiency, it's good at that

1846

General Mach Discussion / Re: Help with Plasma G31 Probe On Floating head

« on: March 27, 2016, 06:53:12 AM »

Concentrate on one thing at a time, disregard the THC.

As far as I know ALL the top-of-material sensing routines use the PROBE input only - get this set up and make sure that the floating head switch shows up in diagnostics as a PROBE input on the screen. Do that first, it's vital.

Once that is working, go to the MDI line and type

G28.1 Z5.000

The head should start moving DOWNWARDS and stop when the floating head switch triggers, it might be worth triggering it early by hand for the first time, this will give you time to e-stop if it fails.

Try that

1847

General Mach Discussion / Re: Physical buttons for plasma

« on: March 27, 2016, 04:58:36 AM »

Nice

With those bits, your table should be built like a battleship!

Somehow I doubt acceleration is going to be an issue;)

1848

General Mach Discussion / Re: Help with Plasma G31 Probe On Floating head

« on: March 27, 2016, 04:02:54 AM »

Is the z switch that is activated setup as the PROBE input or the HOME input, i think it must be the Probe to work as limits and homes are disabled when doing a G28.1

Maybe be better to start a new thread too, the one this in is over a year old?

1849

General Mach Discussion / Re: Physical buttons for plasma

« on: March 27, 2016, 03:55:42 AM »

I think tube is better than shaft, IIRC there is no difference in torsion effects. I started off with a little table 600mm square and thought it was cool only having one motor and a 12mm cross-shaft. That was until I tried getting speed and acceleration out of it when you see it wiggling. That table was 100% aluminium too so pretty light gantry etc. OTOH it did allow me to cut the parts for my new machine

I would still go with two personally, but watch out for the runaway effect especially with servos - you need monitoring to ensure both motors move as if one stalls or fails the the other will rack the gantry to death, not important on steppers as they just stall eventually.

The machine in that picture is a bitch Hate seeing stuff in that state.

1850

General Mach Discussion / Re: Physical buttons for plasma

« on: March 26, 2016, 05:44:20 PM »

3m of 35mm rail x 2 plus box section is going to weigh, a lot

My table was designed to reach 9000mm/min as that is top speed for the PM45, so far I have got up to 5000 and that was scary !

With the tube connecting your side gears, watch out for torque causing a twist as the direction changes, with only one motor it will need to be big - servo's ??

If not, watch your top shaft speed as big steppers don't do well at speed or acceleration.