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Messages - Davek0974

1871
General Mach Discussion / Re: Difference between plasma and mill...
« on: March 21, 2016, 05:30:22 AM »
That was what I was wondering too, I doubt the THC will have any bearing on the speed/accel topic but yes, it is a difference.

1872
General Mach Discussion / Difference between plasma and mill...
« on: March 21, 2016, 03:22:41 AM »
I've built a CNC plasma table and also built a CNC mini-mill and I'm trying to find out the facts behind the way they work.

On the plasma, much effort and expense is used in trying to get massive acceleration figures and speeds to match the material being cut to the power in use, failure to match acceleration causes rounded corners and also Mach3 seems to skip bits of shape just to maintain speed - this seems accepted behaviour in the plasma world. Failure to match speed just gives poor cuts.

On the mill, speeds are a little lower but nothing is said about acceleration or bits of shape being left out - whats the point of a CNC mill that does not follow the shape code after all?

Is there a difference here - Does Mach3 'know' it's a plasma or a mill? Both seem to run the same CV settings.


1873
General Mach Discussion / PWM output...
« on: March 20, 2016, 12:30:53 PM »
Is there an adjustment for the PWM output from Mach3?

I've got my Huanyang 2.2kw VFD running on the 0-10v signal from my BOB and the speed on the VFD shows correct at 24000 rpm when commanded by Mach3, this also tallies with the speed take by a hand-held laser tacho.

However, at lower speeds it's off and generally runs lower than commanded.

Is there an adjustment for this?

1874
General Mach Discussion / Re: How to disable E-Stop on Limit
« on: March 19, 2016, 12:06:34 PM »
I'm only guessing here but if the limits are on one input and the home on another, it should work ok?

My stuff has combined limits and homes and that works how i expected it to.

1875
General Mach Discussion / Re: X-axis is dead
« on: March 16, 2016, 10:24:51 AM »
BOB or bob or Bob, is a Break Out Board - the bit between your pc and the motor drives etc

1876
General Mach Discussion / Re: smooth stepper
« on: March 16, 2016, 08:06:41 AM »
But that is installing more components and more £££ or $$$

If its a simple install with average BOB already, a device like the UC100 is just one component and you are up and running USB in no time.

1877
General Mach Discussion / Re: smooth stepper
« on: March 16, 2016, 06:49:52 AM »
I will make wild assumptions...

Mach3
Not using an advanced THC like an MP3000-DTHC2 (if using plasma)
Windows operating system


I would get a UC100 motion controller - it plugs into your existing BOB and converts connection to USB.

I have just used my first unit and it works perfectly and very easy to set up, but as I assumed above will not work on advanced THC units I think.

Takes 10 minutes to install.

1878
General Mach Discussion / Re: Z Zero Offset for Touch Plate
« on: March 16, 2016, 03:29:29 AM »
The .125 would go in the Gauge Block Height DRO on the Offsets screen in Mach3, to make a manual LED touch plate all you need is a simple circuit of battery, LED, clip, and an insulated plate like some circuit PCB.

The clip would go to the tool, then the LED then battery then PCB - touch the tool to the pcb and the circuit is complete and LED will light up. It will not be as accurate as connecting to the BOB though, which is usually very simple if you have a spare input.

1879
General Mach Discussion / Re: Limits - Am i being too smart ;)
« on: March 15, 2016, 05:05:45 PM »
:)

1880
General Mach Discussion / Re: Physical buttons for plasma
« on: March 15, 2016, 05:04:47 PM »
Wont get any sparks up there, there is a fan of sparks from where the jet enters the plate, they travel along the surface pretty much. If doing wiggle or ramp piercing in thick stuff, you can get a rooster-tail at pierce time but the sparks go cold very quick.