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Messages - BluePinnacle

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191
General Mach Discussion / Re: Do i need a bigger pc for mach..
« on: September 06, 2009, 07:24:50 PM »
Wouldn't think that was it, G64 puts it explicitly in CV mode. :( Wierd, all round.

192
General Mach Discussion / Re: Do i need a bigger pc for mach..
« on: September 06, 2009, 05:42:48 PM »
Thought it might have been a bit obvious. Unless the code itself is overriding Mach3's settings with a G61 command at the top? Apart from that I'm stumped.

193
General Mach Discussion / Re: Do i need a bigger pc for mach..
« on: September 05, 2009, 08:05:52 PM »
Good point, is the code setting the machine into exact stop mode? that would cause juddering. Constant velocity mode is a lot smoother.

194
General Mach Discussion / Re: Different use of Mach3 (dispensing)
« on: September 05, 2009, 04:45:16 PM »
Well, a peristaltic pump comes to mind, coupled to a stepper - the rollers go around and squeeze the resin through a rubber pipe. If the resin is the type to set solid in the clockwork, fear not, just replace the length of rubber pipe. You'll get very accurate pumping which can be done continuously rather than having to withdraw a piston between shots. There's also the potential for two pumps, one for resin, one for hardener, if it's a two-part glue, forced out through a disposable static mixer nozzle. Interested? :D

the lack of inertia on the pump axis (makr it as Z if you wish, I'd probably call it a spindle) means that acceleration could be very high, and you could easily program in ramp-up and ramp-down rates to suit your application, even putting in a slight suck-back to shut off flow more cleanly. There's a lot of flexibility here, potentially, but I doubt CAM applications have this in mind, so I'd think of hand-coding as the way forward.

195
General Mach Discussion / Re: Different use of Mach3 (dispensing)
« on: September 04, 2009, 01:48:14 PM »
Easiest may be constant flowrate, variable feed - programming the line in segments, or writing either a subroutine or a macro to control feedrate progressively.

Great work on a very interesting and productive machine, well done :)

196
General Mach Discussion / Re: Pico Motherboard a Good Option??
« on: September 04, 2009, 11:13:19 AM »
I had monstrous problems running my controller PC with a USB stick left in the slot, it banged and crashed and both the drives jammed solid. It's fine until it moves, after that it throws a huge tantrum. no idea why, it's intermittent so maybe the computer is polling the USB stick periodically as a priority and ruining the pulse train. Just a guess.

197
General Mach Discussion / Re: Do i need a bigger pc for mach..
« on: September 04, 2009, 01:36:05 AM »
Smoothstepper may be what I'm after, I've got a fairly big and quite powerful machine but I could do with faster movement. My stone ages PC will send it round at 1100mm/min tops. I'll investigate.

198
Tangent Corner / Re: Diseases...
« on: September 02, 2009, 08:32:10 PM »
I'm still alive, perhaps I'm just an immune carrier.

199
General Mach Discussion / Re: 1st MDF
« on: September 02, 2009, 08:25:48 PM »
A slice of foam insulation board is good instead of MDF for trial runs, it cuts cleanly and you can't snap a cutter in it even if you rapid through it with no spindle on ;)

200
General Mach Discussion / Re: MACH 3 Z axis
« on: September 02, 2009, 08:23:32 PM »
Make sure your Z goes up first and down last: up out of the way before X and Y movements, especially rapids, and down after X and Y have put it in the right place. Sounds obvious but I snapped off several cutters learning that one.

Also make sure your feedrates for Z are specified explicitly to make sure you don't stub your cutter down too hard :)

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