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Messages - Bobthebuilder

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General Mach Discussion / Understanding Backlash Compensation
« on: December 15, 2018, 06:34:42 AM »

I'm using Mach3 mainly because there is this thing called "Backlash Compensation". So I figured out what my backlash is for each axis using a dial indicator, when I stumbled upon this fundamental problem of this compensation. Maybe its just how it works, maybe I'm using it wrong.

Some numbers first. I set my X-axis to 0.07mm backlash. Without backlash enabled, if I were just to reverse the direction when milling and mill a 100mm pocket, the pocket would be 99.93mm long. That's why I enabled this 0.07mm compensation. With this, when I just reversed (!) direction, Mach3 will add another 0.07mm to the lenght of my desired travel and the pocket will become truly 100mm.

Now image I would just go ahead in that direction and extend this 100mm pocket for anoter 100mm. Now the pocket will NOT be 200mm but it will be 200.07mm. Because Mach3 will add another 0.07mm to my feed lenght, however I'm still going in the same direction as before hence in this case theres NO compensation needed. I thought BC is there to compensate for play in the axis travel.

Backlash Compensation should only be calculated when there was actually a change of the direction you're milling. (but here's the next problem: how should Mach3 know what my last direction I moved was? Should be doable programming wise for sure, but now things get complicated)

Right now, when I do g0x100 five times in in one sequence, I will end up with a 500.35mm track, because the program will always add this 0.07mm to every move I do... When there is no compensation needed at all!

Please tell me I am using BC not correct. Because If this is how this "works", I can't see whats the purpose of this is at all. Thanks.

Finished Screens / Re: Mach3 2010 Screenset - Now available
« on: December 07, 2018, 07:30:08 AM »
I did test this with a clean, unmodified file. I'm a programmer so I know the drill.

I just figured all your 3-axis (not just the 1920x1080) can be opened without errors, but all 4-axis screens give this error. Well, I will check with Klaus, or just go ahead and modify it. Might still work.

Btw in case you still work on this screen and you will be updating it some time, theres a typo in the file "2010-Jog (1650x1080)". I guess you meant 1680x1050. Not like it matters tho, as long as it works.

Finished Screens / Re: Mach3 2010 Screenset - Now available
« on: December 07, 2018, 06:08:58 AM »
Nice screen, finally no eye cancer anymore caused by the standard screen.

Trying to modify the set "2010 (1920x1080).set", I get this error:

https://imgur.com/a/RqjCCpO ("File is not consistent - continue?")

When I hit enter, the screen looks abit... Butchered.

Here's how it looks like in Machscreen:


The bottom screenshot is from "2010 (1920x1080)-4.set" (same resolution, just with 4 axis instead of 3). I have no error warning when opening the 4-axis set.

I have Mach3 current version installed (not yet licensed, but I do have one), also I just bought Screen 2010.

What is the problem with this set? I looks kinda right in Mach3, and so far it looks like everything is working as expected. I still want to shove some buttons around so I'm not sure if this will work with a corrupted file.

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