Does anyone use backlash comp in Mach??

[bluumax]

I set it to .0002 for X & Y. All that did was make mill run like, if I said it they'd through me off the site.
Not amused.
Same results as before, on this thread.
Taig - Wandering mill, Lead screw?

Now I'm going to go make Lego blocks out of Jello, I expect about the same results.

[gmfoster]

I set it to .0002 for X & Y. All that did was make mill run like, if I said it they'd through me off the site.
Not amused.
Same results as before, on this thread.
Taig - Wandering mill, Lead screw?

Now I'm going to go make Lego blocks out of Jello, I expect about the same results.

Just curious have you ever tried the Mach group where all the real Mach experts hang out? Art isn't there 23 hours a day anymore but there are a ton of people that are using this software to make money and even more that have followed it since it was called Master 5.
Garry

Garry

[CS900]

I use the backlash on my x, y, and A axis without any issues.

[bluumax]

how much are you using? Drives? (Xylotex)

[hybidder]

Have you calculated your backlash?

I use Mach3's backlash compensation and also have an independant dro and I am always withing .001 and often better using comensation. I actually used a dial indicator to determine my machine's backlash and then used those figures.

Edit:
After reading your linked thread all I can say is- if your machine has a great deal of "slop" .002" compensation isn't going to help and from the description neither would 6". I think your machine needs some attention.

Good luck

[bluumax]

Hi. I only had it set for .0002 - 2 tenths

[Stepper Monkey]

Comp will cause problems if it is turned on along with certain other options. There are some conflicts. You have to disable the "constant velocity" setting at least if you want to run backlash comp. Then it will usually run fine usually.
Downside is that constant velocity is a VERY useful thing to have, and turning it off offers a lot of disadvantages including a lot of extra noise and slower cuts. That is good enough reason alone for me to not set the backlash comp to active. You can try and decide if it is right for you based on the kind of cuts you do though, as some people do like it.

[mc-motorsports]

You really only need the backlash enabled for precision drilling and reaming. .0002" on a mill is nothing, you will have more than .0002" in tool deflection and ball screw error (motor, belts, pullys, bearings, ballscrews, it all adds up) The problem your having is more than likely the "backlash speed % of max", mine is set to 1% and I can't contour faster than 15ipm with the backlash enabled. For precision engraving, I have to have the backlash enabled, and like I said, I'm limited to 15imp. For general contouring, I turn the backlash off and can contour at 100ipm which is the max speed I have the motors and rapids set to. I think if you purchase a brand new CNC machine tool in the $50-$200K range and realize how much you pay for all the options that Mach 3 comes with, you will respect the software and realize that it is quite powerful, has an unreal price vs. other comparable CNC OS's, and it WAY more user friendly. Problem most people run into is you have to set the parameters yourself, vs. purchasing a machine tool where the manufacture has already set the program parameters at the factory. Once you get it set up, I really think you'll like it, and if you ever do sit down with a salesman and buy a commercial machine tool, I think you'll find a lot of respect for Mach 3. Good luck!
MC

[bluumax]

My problem has been accumulation, not sure what's causing it.
About .005 in +500 lines.
Taig - Wandering mill, Lead screw?
I ran mach without CV using BL comp.
I did a lot of reading & searching before posting, didn't want to waste peoples time with stupid questions that only required a read through some postings & the manual.

[hybidder]

If it's consistently the same amount you might check your count per unit setup?

[mc-motorsports]

Do you mean your losing steps? .005" in a 500 line program?

[bluumax]

Everything is pretty well documented here
Taig - Wandering mill, Lead screw?