Mach Discussion > General Mach Discussion

4th axis runs too slow !!!!

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LarryMiranda:
I have a Taig and am using Mach3 1.9.  When I run rotary axis movement it takes a long time to get to the proper position, because the G-code is in inches and Mach3 and Taig move in degrees/min. Example. 2 inches per minute gets there fast but 2 degrees/min goes by tick ------ tick ----- tick, etc. and there is 80 ticks per degree. This adds a lot of time to the cutting process.

Does someone know a way around this problem. The code is too big to edit all the A moves with a higher F value. My code is generated by Visual Mill.

Larry

Graham Waterworth:
Sound as if you have 1 of 2 options

let visual mill re-post the code with new feeds or drop the code into notepad and do a search and replace of the a feeds.

Graham.

LarryMiranda:
There are thousands of lines of code to change which would take hours and it seems that there should be a way to automate the solution to this problem. I asked this same question about 2 years ago, also with no answear at that time. It seems that by now someone would have a solution.

I can't find anywhere in Visual Mill to introduce a 4th axis movement speed. Best I can tell is that it assumes the same speed and feed of the x axis which is in inches/per minute. At 2.7 degrees/min it will take 130 minutes to travel 360 degrees just for 1 pass. The G-code will make 6 passes of the a-axis, wihch will take 13 hours. And then 2 more finishing passes.

If someone knows a way to change that in Visual Mill I would be thrilled to hear it. What about Mach-3, is there no way to change it there. What about some VB script to adjust the feed for a-axis?

Now, I can spend a few hours manually changing the G-code. But what about next time I generate code. It seems like we should be able to have this done automatically.

I cant believe that I am the only one having this problem. If I am, I sure would like to hear how the rest of you guys are doing it that is different from me.

I am extremely frustrated and need help BADLY.

ART:
Hi Larry:

  On the settings page, there is a DRO labeled A-Axis rotational diameter.
Set it to the diamter of th eobject, or to .0001 , if .0001 is entered, then Mach will use the Z position as the diameter calculation,
it will then correct the feedrate..

Art

LarryMiranda:
Thank you for the response, Art.

I briefly tried it on my desktop, with no machine attached, and it looks like my problem is solved. Next I'll try it in my workshop, although I'm sure it will work.

Does this keep the 360 degrees intact so that the rotary table will go from 0 to 360 then back to 0 again? I'm not sure that I asked the question correctly.

Larry

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