Feedrate / Spindle - Pretty slow carves. Advice appreciated!

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prestongallwas
Posts: 4
Joined: Thu May 11, 2017 10:46 am

Feedrate / Spindle - Pretty slow carves. Advice appreciated!

Postby prestongallwas » Mon Jul 31, 2017 10:58 am

I was hoping to get some clarification on the 'feedrate' / inches per minute setting. I've tried a couple of values now and I can't seem to notice a difference in the overall feedrate. A 7 x 11 1/8" max depth carve is going to take approximately 16 hours or so. The results are stellar, but I'm pretty sure my X-Carve can blast through acrylic a hair faster :). I've also tried the feed rate change option, as well as pumping the feedrate in PicSender but it still doesn't seem to adjust the speed of carve.

X-Carve 1000 x 1000 (2016 Model - Xcontroller/Z-probe/homing switches/Dewalt 611)
60 degree 1/4" vbit
GRBL 1.1f

( PicEngrave Pro 5 - for MS Windows US Version )
( Date/Time: 07-30-2017 at 15:30:47 )
( Image File: Inner.Senshi.full.1739625 )
( Spindle + Feed Rate )
( 30% Feed Rate Change )
( 70.0000 inches/min. )
( Image size in inches: 11.52w x 7.2h )
( Pixel Resolution: 0.006 inch )
( Line Spacing: 0.006 inch )
( Max. Cut Depth: -.0625 inch )
( Min. Cut Depth: -.0010 inch )
( 3rd Axis Safe Position: 1.0000 inch )
( Start Position: image bottom left )
( Horizontal Axis Offset: 0 inches )
( Vertical Axis Offset: 0 inches )
( Engraving Angle: Left 45° )
( Inch Mode )
( X Axis Align 0 )
( Y Axis Align 0 )

Link to gcode below
GCODE https://1drv.ms/t/s!As5hyOW1ipK5j-saH-goB9HNMqIfjA

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Picengravertoo
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Re: Feedrate / Spindle - Pretty slow carves. Advice appreciated!

Postby Picengravertoo » Mon Jul 31, 2017 2:04 pm

If your X,Y & Z accel settings are set low, it will hinder the running feedrate when raster engraving images because of the short incremental (.006") axis moves are accelerating/deaccelerating. You have a 70 IPM set feedrate with a Feed Rate Change of 30%, so at full 1/8" Z depth the feedrate is only 49 IPM.

I recommend you set a higher feedrate in PEP5 (125 IPM?) and unselect the Feed Rate Change. With an 1/8" full depth cut using a 60D V-bit and a .006" Pixel Resolution (step over) you should be able to cut allot faster. You may need to experiment by increasing your axis accel settings, but not too high or your steppers will start loosing steps/position.

prestongallwas
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Joined: Thu May 11, 2017 10:46 am

Re: Feedrate / Spindle - Pretty slow carves. Advice appreciated!

Postby prestongallwas » Mon Jul 31, 2017 2:23 pm

Thanks, I'll give this a try.


$120=500.000 (x accel, mm/sec^2)
$121=500.000 (y accel, mm/sec^2)
$122=50.000 (z accel, mm/sec^2)

In searching for other recommended settings it seems that these could potentially be much higher? I've seen your other post on inventables as high as 12000. I will experiment a bit.
Last edited by prestongallwas on Mon Jul 31, 2017 3:05 pm, edited 3 times in total.

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Picengravertoo
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Re: Feedrate / Spindle - Pretty slow carves. Advice appreciated!

Postby Picengravertoo » Mon Jul 31, 2017 2:49 pm

Since your Z accel is set at 50mm/sec^2, that will be limiting the X&Y axis's at 50 also since each gcode command line has X,Y & Z axis moves.

I use a 12000 X&Y accels with my Shapeoko 2 & nema 17 steppers to laser engrave photos, but your X-Carve should set much lower for spindle raster engraving.

Try changing to this $11=0.005 (junction deviation, mm) grbl setting also. It controls how grbl handles the accels.

prestongallwas
Posts: 4
Joined: Thu May 11, 2017 10:46 am

Re: Feedrate / Spindle - Pretty slow carves. Advice appreciated!

Postby prestongallwas » Mon Jul 31, 2017 2:54 pm

Ok! will do.

My setting was $11=0.020 (junction deviation, mm)

FWIW I restarted with higher settings (first 120=1500/121=1500/122=150) and it seemed ok but its hard to tell carving air ;)


FWIW I have the NEMA-23 motors on my XCarve. What is it that makes the Shapoko 2 be able to handle 12k but the Xcarve less? Rigidity in design? Sorry I'm still new to all this :-)

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Picengravertoo
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Re: Feedrate / Spindle - Pretty slow carves. Advice appreciated!

Postby Picengravertoo » Mon Jul 31, 2017 4:09 pm

Less weight to move (laser & our Shapeoko 2 frame weight) and the nema 17 steppers can handle higher accels than the nema 23 steppers can.

prestongallwas
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Joined: Thu May 11, 2017 10:46 am

Re: Feedrate / Spindle - Pretty slow carves. Advice appreciated!

Postby prestongallwas » Mon Jul 31, 2017 5:08 pm

Good deal, thanks. I imagine this will significantly improve the speed of my laser engraves too, which I was rather disappointed with as single passes would have taken 30hr or some such.The knowledge gap is real :D


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