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Messages - Davek0974

1071
General Mach Discussion / Re: Backlash...
« on: September 29, 2016, 07:36:11 AM »
Feel free to elaborate at your leisure :)

I knew there would be some backlash, in fact i was pleased how little it is really for an old girl.

The holes are 3.1mm and a 3mm screw 'almost' fits so its not like its a country mile off size or coming out square :)

Yes I could drill them but that means another tool change and TBH the end mill makes a neater job out of them.

I will measure my slop and save up for the new bearings.

1072
General Mach Discussion / Re: Run a macro from a button press??
« on: September 29, 2016, 07:31:45 AM »
No free lunch is there ;)

There is nothing else in the pump so thats one thing, whether Mach will like it well i'll just have to see i guess :)

Definitely one of the weaker points of Mach3 though I think.

1073
General Mach Discussion / Re: b axis to trigger a relay for downdraft fan
« on: September 29, 2016, 06:40:28 AM »
I have my fan running from a small time-delay relay which fires with the torch but the delay holds the fan on for 30s so the rapid torch on-offs appear as a continuous signal after the delay.

Just an idea but i find it works well and uses no more outputs etc.

1074
General Mach Discussion / Re: Run a macro from a button press??
« on: September 29, 2016, 05:28:55 AM »
It runs a z-height sense routine using G31, the usual style - fast then slow, using a touch-plate.

Probably takes 10-15s to run.

It will certainly take longer than the button-down time so multiple runs should be avoided there if that was the gotcha?

I also need to add in some code to prevent it running if the stop LED is off i.e. in run or feed-hold modes.

1075
General Mach Discussion / Re: Run a macro from a button press??
« on: September 29, 2016, 04:43:19 AM »
Poke fun all you like, most of the time i ask for it ;)

Got it, it was the qualified name bit i didn't grasp, there are no examples of it in the manual at all :(

I will insert your code tonight and have a go, no doubt it will run.

Thanks


BTW, the tractions engines - all you get is a set of dimensioned drawings, no instructions, no tips, how you make it is entirely up to you :)

1076
General Mach Discussion / Re: Backlash...
« on: September 29, 2016, 04:12:55 AM »
Bearing king seems ok, still a lot of ££££ at £122 per pair  - ouch

1077
General Mach Discussion / Re: Backlash...
« on: September 28, 2016, 03:21:26 PM »
Thanks, i'm sure there will be some variation as the ways are not worn evenly as normal on Bridgy so there will be more load on the screws at each end.

I'll run the tests and get some numbers but I really do need to find some bearings.

1078
General Mach Discussion / Re: Run a macro from a button press??
« on: September 28, 2016, 03:04:43 PM »
Thats a thought, thanks.

I'll try that way tomorrow, BUT as i said - the macro-pump does seem to be triggering its just that runscript does nothing or is not recognised?

1079
General Mach Discussion / Re: Backlash...
« on: September 28, 2016, 03:01:25 PM »
Hmm i guess so, does backlash comp actually work?

Any tried and trusted ways of assessing actual backlash - I know its there, just need to assess and maybe adjust or compensate.

I know it needs new bearings on the ball-screws, one axis is new but wrong type, other axis is old OEM type so still not ballscrew style but better than the new ones!

List price is over £100 per pair so i need to find the right ones here.
Have read that any angular-contact bearings that fit would be ok with the right shims - the originals are pre-ground so there are no shims needed.

1080
General Mach Discussion / Re: Bridgeport Knee Mill Conversion?
« on: September 28, 2016, 02:56:05 PM »
Drive is 1:1, 8mm pitch HTD belt 30mm wide

I was thinking of making a new bottom cover - the one that sits under the motor - and joining up to the motor shaft with something.