Messages

2011

General Mach Discussion / Re: Physical buttons for plasma

« on: February 06, 2016, 05:49:36 AM »

Same R&P setup as mine Stirling, I have 4Nm motors though.

I was pondering ballscrew when I built my table but your point was one of the reasons i did not use them, the rack on my gantry (X axis) is exposed and I have concerns about that. The Y racks are nicely tucked away under cover plates on the sides and so far have remained clean. I fitted double wipers and muck scrapers on my linear blocks - it tightened them up a bit but hopefully will extend their life, I also grease regularly to flush any muck out.

2012

General Mach Discussion / Re: Physical buttons for plasma

« on: February 06, 2016, 03:31:31 AM »

Thanks for the numbers Dave.

What travel, dia etc of screw do you use. I may have a spare 10mm pitch ballscrew if I can find it, not seen it for a while but I know I bought more than one. It is 25mm dia screw and a fairly long nut on it and it has been shortened, prob about 100-120 travel, I originally had it fitted to the quill on my very first retro, a manual Bridgeport.

Hood

Thanks for that, mine is only 10mm dia, i have emailed the maker as they do offer a 10mm x 4mm pitch screw that is a direct swap-in, that would be a nice easy upgrade. Its a two-start version of the standard unit.

2013

General Mach Discussion / Re: Physical buttons for plasma

« on: February 05, 2016, 03:17:51 PM »

Yes it would be a pretty easy swap too, 10mm trapezoidal screw fitted i think, will make a note and look out out for a steeper thread, i think 744rpm is right at the top of the scale for a nema23 on 50v and getting it lower would be good.

2014

General Mach Discussion / Re: Physical buttons for plasma

« on: February 05, 2016, 02:25:15 PM »

I had it set originally at 1200mm/min and 900mm/s/s acceleration, this seemed a tad low so I pushed it up until it screeched which was at 2000mm/min so i backed off to 1500mm/min. The acceleration went way up to 5000mm/s/s before a screech so backed that down to 4000mm/s/s which gives an estimated 0.3g and 744rpm measured with a tacho on the motor shaft. I think thats ok for a 3.1Nm Nema23 motor. Steps per mm is 1000, 2mm pitch screw direct drive.

Dave

2015

General Mach Discussion / Re: Physical buttons for plasma

« on: February 05, 2016, 02:20:52 AM »

3.1Nm on my Z and CNC4YOU.co.uk DSP stepper drives

2016

General Mach Discussion / Re: Physical buttons for plasma

« on: February 04, 2016, 04:26:05 PM »

I did the second time

2017

General Mach Discussion / Re: Physical buttons for plasma

« on: February 04, 2016, 04:18:32 PM »

Yep good old inches, D'oh!

Got both files cammed up and will be testing them saturday.

Post results pictures here or elsewhere?

Thanks

2018

General Mach Discussion / Re: Physical buttons for plasma

« on: February 04, 2016, 03:45:14 PM »

Hmm, odd, do you scale that when importing ??

Tried it here and sheet cam says it 6mm wide by 5mm tall, might need surgical laser to cut that one

2019

General Mach Discussion / Re: Physical buttons for plasma

« on: February 04, 2016, 02:49:19 PM »

Keep working toward turning hobby into business...  paycut from dayjob... But may be more enjoyable.... Retirement business maybe in future.

Already trying that idea

Care to post up your file?

2020

General Mach Discussion / Re: Physical buttons for plasma

« on: February 04, 2016, 02:16:06 PM »

Dave, did you have a look at the PDF I posted a forum page or two before?

(I'm out of ideas)

Yes, thanks, i have seen that before but as TP says, its high-end stuff but i guess some of the info will down-scale to our size equipment.

what would be really useful is a standard test piece  that could be passed around forums so results could be compared - it may be that 90% of what we all seek is not possible and if everyone got the same results on the same part it would prove it.

just a thought.