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Author Topic: Why is this happening at higher feed rates?  (Read 3349 times)

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Offline Chaoticone

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Re: Why is this happening at higher feed rates?
« Reply #10 on: June 08, 2015, 02:38:56 PM »
Do you have backlash comp enabled? If so, turn it off and retest.
« Last Edit: June 08, 2015, 03:13:38 PM by Chaoticone »
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Re: Why is this happening at higher feed rates?
« Reply #11 on: June 08, 2015, 03:01:18 PM »
BR549 - The correct cut is the line before the shift goes inside the boundary before the turn.  The shift occurs just before the turn going CW, not after.

Chaoticone - I'll have to check on the backlash comp
« Last Edit: June 08, 2015, 03:04:25 PM by AndyMS »
Re: Why is this happening at higher feed rates?
« Reply #12 on: June 08, 2015, 03:07:21 PM »
does the DRO show the axis moving on the axis that shouldn't be moving?

Offline BR549

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Re: Why is this happening at higher feed rates?
« Reply #13 on: June 08, 2015, 06:24:09 PM »
That is NOT what your picture shows .The one with the red arrows. It shows the tool turns the corner (with no rounding as it should)  first THEN shifts outward. Then goes to the next corner and repeats the same motion in the opposite axis.

OOPS Sorry that was not your picture (;-)

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« Last Edit: June 08, 2015, 06:26:11 PM by BR549 »

Offline BR549

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Re: Why is this happening at higher feed rates?
« Reply #14 on: June 08, 2015, 06:29:43 PM »
OK can you post the gcode you used ?



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Re: Why is this happening at higher feed rates?
« Reply #15 on: June 08, 2015, 07:30:28 PM »
Just looking at it BR549 it looks like tool compensation is being turned of on the corners.
I think you might be right in thinking its in the GCode.

Wes

Offline BR549

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Re: Why is this happening at higher feed rates?
« Reply #16 on: June 08, 2015, 08:19:13 PM »
BUT that cannot be as the feedrate is effecting it. It is still pointing to mechanical issues. IF it was in the Gcode it would do it all the time. I just want to double check the Gcode and test it here.

I am with Gerry I have NEVER seen this problem from Mach3 as it defies the motion logic in mach3. 

(;-) TP
Re: Why is this happening at higher feed rates?
« Reply #17 on: June 08, 2015, 10:38:06 PM »
I went home and ran a program under no load, and the issue was still present.  I even ran the code in Mach3 with the machine off and ob :)served the shift in the DROs.

I then started studying the gcode.  I discovered that these offsets were in the gcode, and each corner approach involves over 30 lines of code.  So, it appears the machine is just doing what the code is telling it to do, but why is the gcode doing this?

Offline dude1

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Re: Why is this happening at higher feed rates?
« Reply #18 on: June 08, 2015, 11:06:45 PM »
what cad program are you useing

Offline BR549

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Re: Why is this happening at higher feed rates?
« Reply #19 on: June 09, 2015, 12:03:53 AM »
 :o ;D (;-) TP