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Messages - yaddatrance

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General Mach Discussion / Re: Whose Fault Is ThIs?
« on: February 13, 2010, 02:31:13 AM »

I just ran into this bug!

Mach is losing steps in Z when doing a ramping helical interpolation in certain scenarios. It actually appears to handle arc center at X,Y of 0,0 just fine, but certain values of x & y causes it to lose steps... and it loses it exactly the same way and place every time.

I've attached a code segment that performs a finishing cleanup on a parabola which triggers the problem for me. Just to make sure I was sane, I put a digital counter on the z step pin and mach is simply not sending enough steps but it displays that it's in the correct position.

If I had to put money on it, whatever algorithm that was used to calculate the number/timing of Z step pulses during the ramping helical interpolation is running into either a casting or flooring issue.

General Mach Discussion / Re: 3 pin drive will it work
« on: July 07, 2009, 01:16:10 AM »
I'm beating a dead subject here, but I thought I'd clarify this post for posterity and other folks... that 25-pin port with 3,5&7 is a serial port, not a parallel port. The centroid control is a CNC3... 1200 7E1 I believe... the Tri-onics DRO and control up top is just a "user-friendly" interface for conversational programming that literally screen scrapes the centroid below. The centroid speaks G-code natively.

You cannot interface Mach to the centroid (the centroid is a cnc controller itself), but you can drip feed it using other software if necessary... Mach CAN interface with the stepper drives inside, though they are the noisiest full-step drivers on the planet and you may as well throw them out and get geckos.

I'm a registered mach 3 user who doesn't want to get deleted for not posting...  ;)

It's pretty easy to use so I can figure most of it out myself, and the rest I've been able to find answers to on here and cnczone...

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