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Messages - eforer

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11
General Mach Discussion / Re: Missed steps??
« on: August 22, 2012, 03:22:25 PM »
I'm wondering if any of the settings relating to the data rate and buffer need to be adjusted.  They are all set to the mach 3 defaults.

12
General Mach Discussion / Re: axis acceleration
« on: August 22, 2012, 03:21:36 PM »
I'm using sheetcam's mach2 post.  Where would I expect to see a G61 or G64 in my code?

13
General Mach Discussion / axis acceleration
« on: August 22, 2012, 01:31:23 PM »
We retrofitted our Multicam cnc router to mach 3 some time ago after finally losing it with multicam support for the electronics, pendant etc.  One thing we have struggled with the whole time with this machine has been issues with chatter and cut precision when changing direction.  I discovered that while the motors weren't stalling, the accelerations have been too high creating shake in the spindle during abrupt starts and stops.  Is there a formula to figure out safe minimum acceleration speeds for a given feed rate.  We never cut much above 150 ipm.

Thanks!
-Ed

14
General Mach Discussion / Missed steps??
« on: August 22, 2012, 01:28:26 PM »
Hello,

We have been running a Multicam 5'x10' table retrofitted to mach 3 for quite sometime.  We are having an inconsistent issue where on multiple depths/pass jobs we sometimes have passes that don't line up by a few hundreths of an inch.  I'm having a hard time telling if it is because the material is shifting or if the machine is losing steps.  We are using an ethernet smooth stepper board with cnc4 pc C32 boards.  The machine has pacific scientific stepper 6410 stepper cards and some pretty beefy motors.   

15
General Mach Discussion / Re: Unusual problem
« on: May 22, 2012, 11:20:31 AM »
fixed it, silly thing, the jog was toggled off in tool settings.  Never even noticed the buttons.

-Ed

16
General Mach Discussion / Unusual problem
« on: May 22, 2012, 10:13:48 AM »
I'm having a strange issue, for some reason I can no longer jog from anything other than my shuttle pro based mpg.  We have changed no settings anywhere and when I click the "jog" mode select on the on screen mpg, none of the options (step, cont. etc) illuminate.  I can't use the virtual buttons or my keyboard arrow keys anymore.  Any thoughts?  This machine is used in a production environment and gets a full shift of use daily and no one ever changes any settings so this is a little odd.

17
General Mach Discussion / Re: trouble cutting circles
« on: February 29, 2012, 04:11:30 PM »
Moving the spindle manually on the rack you can feel varying amounts of slop.  I can adjust the pinion, but if I get it slop free in one area, it is too tight in other spots.  Is this effect possibly a result of a not squared gantry?  I have a slaved axis for the second drive on my X axis.

18
General Mach Discussion / Re: trouble cutting circles
« on: February 29, 2012, 03:50:26 PM »
Also, that hole is .490"

19
General Mach Discussion / trouble cutting circles
« on: February 29, 2012, 03:50:05 PM »
Hi Guys,

I recently converted a Multicam I purchased to mach 3 using an ethernet smoothstepper, and a c 32 breakout board.  I purchased the unit refurbished from multicam, they failed to properly test it and all the internal logic boards were toast so a mach 3 conversion was my best bet (they refunded some of my money).  The conversion has gone smoothly and we have cut a lot of parts.  We do a lot of sign work etc. so we have been getting usable output for big stuff in spite of the problem I'm writing about. 

The issue I am having is with small, detailed cuts.  Initially, they were out of round erratically, but we found a ton of slop in the Y axis and that cured it from being inconsistent.  Now it is consistently out of round.  It sort of looks like it could be caused by backlash, but I wanted you experts to look at it so I can get some other opinions.

The machine is rack and pinion and feels pretty tight, I have not gotten around to measuring the backlash yet.



-Ed

20
General Mach Discussion / Flatbed prints, G68 and Copy Cat
« on: January 10, 2012, 10:05:25 PM »
Hi All,

I'm new to Mach 3 (retrofitting my ginourmous multicam).  It is part of our large format shop and we cut out all sorts of big prints made with our Gandi Jeti flatbed.  The flatbed is very precise, more so than the router.  So we don't need to compensate for stretch.  Rotation is another matter.  The pin registration is quite good, but on a 10 long board things can go a little out of whack.  The print will be square to itself but it might not be perfectly square to the board.  Now that we have the added flexibility of mach 3, especially the coordinate system rotation, this could work out really well for us.  I'd like to permanently affix a camera to the side of the spindle and use it like a visual probe and then use those coordinates to make the calculations to rotate the coordinate system automatically and set the origin.

Has anyone implemented anything like this?

Thanks!
-Ed

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