I think 0 backlash is a little crazy, it can't realistically be done or is at least is not worth the effort, especially when it's not necessary. I also believe that my Sherline doesn't like low numeric backlash numbers at all, the Sherline wasn't made for it and would require expensive upgrades to do it right. It also doesn't like the ways too tight either.
Two images take you through the Mach3 menus.
1st select Backlash from the Config drop down.
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2nd: Enter in the numbers you get from your machine backlash analysis
Say OK and that's it. I have set the Backlash speed to 25% after becoming very leery of running my machine anywhere near top speed.
To get my backlash numbers I use the following method.
I set up a 0.200" travel indicator especially for quick and easy use.and developed the universal bracket that can be turned 90deg. or positioned anyway that works best.
Small detail; because the indicator is offset from the spindle it rotates and so the spindle must be held fixed. I made the little snubber you can see on the top that I can jam against the pulley to keep the indicator from moving.
Instead of the short travel indicators the long travel makes all the difference; I drive it at least 0.500" into a right angle plate and use the 0.100" jog mode on Mach 3 to go back & forth. I do it all real time; check the reading on the indicator, change the setting in Mach 3, hit enter and check the indicator again.
Doing this once a year is not enough, I'm trying to do it at the start of every new project and I'm keeping a log too.
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