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Post by brianpetrie on Oct 8, 2018 14:52:09 GMT
It's all I can think of right now.
I just purchased a machine, milling out a series of grooves on a piece of rigid foam 3x3x.25" for a project. There are 15 small 3mm grooves on top. The z axis will occasionally retract about 5 mm too much after one of the lines, then slowly with each pass get back down to where it should be a couple lines later. It never happens in the same place twice, just whenever it feels like it. It never plunges too low. It also happens on the Y axis here and there setting back up for another cut on a new piece of foam. It fails to get back to the G92 set at the start. Not always, just sometimes.
The couplers are all tight, not slipping. Wheels are all good, it's wired correctly, the design and toolpath are good. But the inconsistency of it is strange. I would think whatever it is would happen at the same point of every run, but it's not.
Please help, I am new to this, and want this to work. Almost there!
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Post by Bruce on Oct 8, 2018 15:09:08 GMT
What software are you using? Please post your G code file. Thx Does it run ok in a simulator like Camotics?
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Post by brianpetrie on Oct 8, 2018 17:53:39 GMT
Here is what I have, I have redesigned the milling a couple times in Fusion 360, and it's the same, or prints a diamond shape instead of a square. The tool path looked good in the fusion simulation.
%
(1005)
(cracker)
(T4 D=2 CR=0 - ZMIN=-1 - flat end mill)
G90 G94
G17
G21
(Slot3)
G92 X0 Y0 Z0
G0 X34.02 Y-36.1
Z15
Z5
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X29.16 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X24.3 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X19.44 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X14.58 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X9.72 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X4.86 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X0 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X-4.86 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X-9.72 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X-14.58 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X-19.44 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X-24.3 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X-29.16 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X-34.02 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z15
%
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Post by brianpetrie on Oct 8, 2018 18:03:28 GMT
Here is what I have, I have redesigned the milling a couple times in Fusion 360, and it's the same, or prints a diamond shape instead of a square. The tool path looked good in the fusion simulation. Camotics is great, thanks for sharing that, It looks great in the simulation.
%
(1005)
(cracker)
(T4 D=2 CR=0 - ZMIN=-1 - flat end mill)
G90 G94
G17
G21
(Slot3)
G92 X0 Y0 Z0
G0 X34.02 Y-36.1
Z15
Z5
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X29.16 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X24.3 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X19.44 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X14.58 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X9.72 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X4.86 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X0 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X-4.86 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X-9.72 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X-14.58 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X-19.44 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X-24.3 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X-29.16 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z5
X-34.02 Y-36.1
G1 Z2.5 F3005.3
Y36.1 Z0.75 F3001.8
Y-36.1 Z-1
Y36.1 F3005.3
G0 Z15
%
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Post by Derek the Admin on Oct 8, 2018 21:00:54 GMT
Which machine?
When you say it makes a diamond instead of a square, do you mean it makes a nice crisp looking diamond or something botched up? Does it show the Z lift issue when the router is off as well (like if you were just cutting air).
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Post by brianpetrie on Oct 8, 2018 21:56:37 GMT
We bought a carve king a few weeks ago for my new job for a project. When I say diamond shape, I am printing 15 grooves in a row across 3"x3". it will occasionally go too far back (5mm?) on y before it mills another groove. It will also do the same on Z, today it was climbing higher and higher up on each line by anywhere from 3-5mm, sometimes not at all. It's different every time, and it's definitely not the couplers slipping. The simulations are all correct gcode-wise, mechanics are good, and wiring is good as far as I can tell. Every time we run the program, it is different every time. I can film this run and send the code to you so you know I am not crazy.
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Post by brianpetrie on Oct 8, 2018 21:57:58 GMT
I also started using a pen, and skectchpad instead of the router...It helps see exactly what's happening.
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Post by Derek the Admin on Oct 9, 2018 0:48:58 GMT
Okay, thanks for the additional info. I wanted to isolate out the router's electrical noise messing with anything. This usually comes down to V wheels or antibacklash nuts. There's an electrical component to it and we can bench test them if needed to rule an of that out, I don't suspect that if it's on more than one axis (unless you see the power supply light flickering). This usually just comes down to driveline misalignment, v wheels too tight, or pre-load on the antibacklash nuts too high.
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Post by brianpetrie on Oct 9, 2018 1:21:50 GMT
I’ll take a look at the wheels behind the Z, make sure it all looks good again. I wouldn’t think that it would raise too far with that issue, I’d think it would not raise far enough.
Can you tell me how I can tell if the backlash nuts are too tight / loose? I am confuse how to tune them correctly. Thank you.
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