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want to get feet wet... looking for recommendations


mistermikev

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so was reading a similar issue with a guy but on his it was his z axis...

"I posted my problem on the Mach3 yahoo group and got a solution from someone named Brian, who I think is associated with ArtSoft and Mach3. He told me to try adding 5us to the pulse width (bottom right corner of the motor tuning dialog box). Looks like that solved my problem"

might give this a shot.

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That's really wierd. Almost looks like there's soft limits truncating the movement of the X axis in the negative direction. If you accidentally positioned your Gcode within the boundaries of your machine such that the workpiece overhung the negative X limit I would've thought Mach3 would give you an error on startup saying that the Gcode was larger than the maximum travel of the machine (or something to that effect) and prevent you from running the program. Might be more of a question for @MiKro - is it possible to accidentally set up Mach3 such that it will ignore the soft limits of the machine, and instead of halting the program it runs it anyway?

It is worth exploring though:

  • All movement on the Y axis in your Gcode is in the positive direction (the cutter only goes 'more north' or 'less north').
  • Z axis only goes negative towards the floor, with the exception of a couple of movements where it is +0.2" above the work piece while repositioning (can you confirm that the Z axis actually does rise upwards above zero when it does these repositioning moves, or does it also get clipped at Z=0?).
  • X axis is the only one programmed to spend equal time moving positive or negative of zero.

I'm thinking there may be something funny going on with the zeroing of your workpiece and machine before starting the program, and the lack of defined coordinate offsets in the Gcode header (see point 1 in my earlier post).

What happens if you take the first few lines of your Gcode:

19 hours ago, mistermikev said:

(1 = End Mill MV {0.25 inch})
N100G00G20G17G90G40G49G80
N110G70G91.1
N120T1M06
...

And insert an extra line N115:

19 hours ago, mistermikev said:

(1 = End Mill MV {0.25 inch})
N100G00G20G17G90G40G49G80
N110G70G91.1
N115G54
N120T1M06
...

 

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27 minutes ago, mistermikev said:

"I posted my problem on the Mach3 yahoo group and got a solution from someone named Brian, who I think is associated with ArtSoft and Mach3. He told me to try adding 5us to the pulse width (bottom right corner of the motor tuning dialog box). Looks like that solved my problem"

I'm inclined to think it's something else. If you look at my second diagram of your movement, the X axis will actually go east and west. The problem you appear to be having is that it won't go west far enough; the axis goes west as far as 0 and doesn't go any further. If it were something like step loss due to incorrectly set pulse widths and/or timing you'd expect to see the axis drift by random amounts in random directions when running any Gcode, not just this one neck pocket routine.

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5 minutes ago, curtisa said:

That's really wierd. Almost looks like there's soft limits truncating the movement of the X axis in the negative direction. If you accidentally positioned your Gcode within the boundaries of your machine such that the workpiece overhung the negative X limit I would've thought Mach3 would give you an error on startup saying that the Gcode was larger than the maximum travel of the machine (or something to that effect) and prevent you from running the program. Might be more of a question for @MiKro - is it possible to accidentally set up Mach3 such that it will ignore the soft limits of the machine, and instead of halting the program it runs it anyway?

It is worth exploring though:

  • All movement on the Y axis in your Gcode is in the positive direction (the cutter only goes 'more north' or 'less north').
  • Z axis only goes negative towards the floor, with the exception of a couple of movements where it is +0.2" above the work piece while repositioning (can you confirm that the Z axis actually does rise upwards above zero when it does these repositioning moves, or does it also get clipped at Z=0?).
  • X axis is the only one programmed to spend equal time moving positive or negative of zero.

I'm thinking there may be something funny going on with the zeroing of your workpiece and machine before starting the program, and the lack of defined coordinate offsets in the Gcode header (see point 1 in my earlier post).

What happens if you take the first few lines of your Gcode:

And insert an extra line N115:

 

well... and the pickup cavity just below that... extends further to the west than the neck cavity??  so it def isn't that since I ran that minutes before this!  and cut the body shape! and I ran the pickup after as well to ensure something wasn't all of the sudden physically stopping it!

plus, I've copied my config file into mach3 new just to rule that out (soft limits and the like are all saved there).

z was going above the piece as it seems to cut 'like normal' with the exception of location.

the thing with coordinates... if I check them after... my y and z are right on... but my x has moved.  if it was changing the x... youd think it would start out east of ctr... but it doesn't.  I will try the N115:  - you just want me to put it as the first line?

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6 minutes ago, curtisa said:

I'm inclined to think it's something else. If you look at my second diagram of your movement, the X axis will actually go east and west. The problem you appear to be having is that it won't go west far enough; the axis goes west as far as 0 and doesn't go any further. If it were something like step loss due to incorrectly set pulse widths and/or timing you'd expect to see the axis drift by random amounts in random directions when running any Gcode, not just this one neck pocket routine.

good point.

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( Step03a_CT5StringBody_V2.08_PU-EMG707 )
( File created: Monday November 16 2020 - 12:44 PM)
( for Mach2/3 from Vectric )
( Material Size)
( X= 15.900, Y= 20.400, Z= 2.250)
()
(Toolpaths used in this file:)
(Pickup-EMG707)
(Tools used in this file: )
(1 = End Mill MV {0.25 inch})
N100G00G20G17G90G40G49G80
N110G70G91.1
N120T1M06
N130 (Tool: End Mill MV {0.25 inch})
N140G00G43Z0.8000H1
N150S12000M03
N160(Toolpath:- Pickup-EMG707)
N170()
N180G94
N190X0.0000Y0.0000F80.0
N200G00X1.6833Y-3.3946Z0.2000
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Just having a look at it now. In the mean time try running the attached file. It's just the pickup and neck pocket components merged into a single Gcode, with the pickup cavity running first. Run it in the air, just in case there's something I've overlooked when I've joined them together, and your machine tries doing something unexpected (the sim in Camotics looks OK though).

Rename the file extension from 'rtf' to 'nc' (forum software won't let me attach an nc file)

Pickup + Neck Pocket Test.rtf

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can't complete it because too many passes (takes forever ran it 3 times) it keeps getting too close to my workpiece (I'm not ready to move that just yet) and I've maxed out my z axis (if I go any higher I'll hit my limit).  for what it's worth the pickup part ran fine.  If I knew what to remove or how to change all passes to be sm height...

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sorry for delay... had some thanksgiving chores to do for the wife and (according to her) they were immediate need (happy wife happy life and all).

so, finally got around to running it and catching it at the part where it does the neck... sm issues.  keeps returning to just west of the centerline and keeps progressing further east.  

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Is the X axis mechanically stiff at that position on the table? Does it feel like the axis is binding if you try turning the motor shaft by hand with the power off?

With the power on and the cutter near where the problem occurs, can you jog the machine east/west in Mach3 with no trouble?

Does the plot/preview in Mach3 look like the expected shape of the neck pocket, or is it squished up/lopped off on the west side?

When you run the neck pocket routine and it fails to travel west past the centreline, does the X axis pause at the centreline as if the remainder of the missing move is still being 'played' in the background or does it transition immediately into the next north/south move with no delay?

When the west motion is limited is it at the exact same X value every time, or is there some variation in the point at which it stops?

Try running the attached and see what it does (with the Z axis unplugged). Rename file extension as before. It's the same neck pocket routine, but with the origin set to the bottom centre of the neck pocket rather than the middle of the guitar body. Assuming you don't change your work origin it should trace out the neck pocket somewhere near the middle of the body.

Test Neck Pocket_origin BC.rtf

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so I'll answer some of these and then go give a few things a shot...

it moves to the position just west of the x with precision every time... like it was programmed to go there.  no stall, no variation.

I read some about settings this morning and changed a bunch of stuff... including upping the pulse to 5... and it made the machine fast as all get out... but ran the original neck program and still does the sm thing.  

will go check for stiffness and run the prog - thanks again for sticking it out here with me!  I fell like if I could at least zero in on the problem being w the controller... I'd feel pretty good about it... but it being an unknown... just frustrating!!

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