Messages

2161

General Mach Discussion / Re: Mach3 + G540 + TechnoCNC = stalling. Tried just about everything...

« on: January 30, 2013, 06:25:54 AM »

I would first suggest that you drop the IPM to say 30 and  acceleration to 3 for the Z and see if you skip.
Your stepper is skipping. Could be due to binding at that part of the travel.

RICH  

2162

General Mach Discussion / Re: lathe threading pitch error

« on: January 30, 2013, 05:35:23 AM »

a copy of his modified screen for the Lathe

What screen are you referring to?

RICH

2163

General Mach Discussion / Re: mach3 purchase question

« on: January 28, 2013, 09:24:05 PM »

Will I be able to draft my project on my laptop and put the code on a disk and cut it on the other offline computer?

Yes.
RICH

2164

General Mach Discussion / Re: 3D-CAM needed

« on: January 28, 2013, 06:31:20 AM »

I have not much money, so i can only buy one, and need the best one for my money.

It all depends what you want to do now or in the future. Only you can decide and once you select the item of choice you to pay for it. You really need to compare what a program accepts / does for input, the user interface, what it generates, etc.
The more sophisticated programs provide options which you may not find in other programs and you pay for what you get.

Take your time and evaluate to satisfy the way you work and what you need, thus no suggestion provided.

RICH

2165

dspMC/IP Motion Controller / Re: g94/95 feed problem

« on: January 28, 2013, 06:11:50 AM »

I am trying to compare mach to the high end controls

I can't provide you with a comparison to other controllers.
Sort of like saying what is the difference between all the dialects of Gcode and how do they vary from the NTIS
standard. How about where there is no standard and it's proprietary. The numerous PP's provided by Cam programs
for different controlling programs is a good example of addressing the nuisances. That said, one needs to look at the specific
control manual for guidance. At a higher level of general resource information, Smid's CNC handbook becomes my personal reference, but as noted, there are differences.

RICH

2166

General Mach Discussion / Re: Spindle RPM feedback, not low enough.

« on: January 27, 2013, 08:07:23 PM »

Dickeybird,
Thanks for taking the time and posting as I have been out and about for a number of days.
RICH

2167

General Mach Discussion / Re: Strange Jogging results

« on: January 25, 2013, 06:13:03 AM »

When you microstep the step can be anywhere within a few microstep. Greater than 10 is the limit for steppers unless using mechanical reduction to achieve better resolution. ie; Steps per inch on my engraving machine is 253000, very difficult to see /
actualy check micron movements. I could see 0.0000100" using 400x microscope along with calibrated standard even lower but real PITA.

Back to the real world.........
 Different controllers, motors. screw accuracy, (even belt tension....), backlash, etc all come into play on very small moves. Set your steps per unit based on the longest travel, accurately, that way, small moves will more accurate. Calculated system resolution  for the smallest step is never realy real world.

RICH

2168

General Mach Discussion / Re: Spindle RPM feedback, not low enough.

« on: January 25, 2013, 05:50:28 AM »

Timing is no longer supported, don't activate it, use single slot. Single slot is just as accurate.
Use the formula for the slot width as a guide. I found i had to
make it wider if the higher rpms were not seen. Use a flat black painted CD for the disc on the Sherline, in fact have one disc with multiple slot widths of varying widths just to play with. Put black tape over the slots so only one is seen.
Debounce here was usualy 10, below that was not good and above, say 100 that took to long to confirm the index signal.
Each system is different so just need to play. Lower the better. I changed to Hall sensor and found that to be far supperior. BTW, not all Hall sensors are the same for sensing  time, some are slower and you won't be able to use for high rpm's.

By pass the BOB, make things as simple as possible so you know if something is affecting the index.

I'll be out and about for and back in a few days. Didn't get a chance to play around last night nor get a few definitons
asked about.

RICH

2169

General Mach Discussion / Re: Spindle RPM feedback, not low enough.

« on: January 24, 2013, 06:49:49 AM »

Katoh,
What version of Mach are you using?
Found most of my notes.....quick look at over  100+ pages of stuff.
Good grief.......I will post when sorted out.
Hope to try low rpm's tonight.

Later,
RICH

2170

General Mach Discussion / Re: Spindle RPM feedback, not low enough.

« on: January 23, 2013, 08:01:19 PM »

It's been a long time since actual testing but need to find my notes on the subject.

I use 53 rpm on one of my lathes and i know that The Sherline was used below that.

more after i do some looking into my vaults......
RICH