Spindle wont go up to clear surface at beginning of job

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jfboyd
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Joined: Thu Oct 22, 2015 7:12 pm

Spindle wont go up to clear surface at beginning of job

Post by jfboyd » Tue Apr 19, 2016 2:30 am

Any idea why my spindle wont go up at the beginning of a job to clear the stock surface? It just go straight from zero to beginning of the job. If surface is not 100% levelled, it will scratch it.

I just changed my board for the new one to fix the disconnect issue. I thought it would fix this too, but it's still doing it. Im creating my Gcode with Create.

Thanks for your help!

WillAdams
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Location: Pennsylvania --- south of the Turnpike, East of US-15
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Re: Spindle wont go up to clear surface at beginning of job

Post by WillAdams » Tue Apr 19, 2016 3:37 am

Carbide Create seems to use:

Code: Select all

G1Z-0.883F293.4
for a safety margin.

Not much unless your machine and stock are perfect.

One thing to check is Z-axis belt tension.

You could edit the code by hand.

I'd suggest filing a feature request for configurable safety margin.
Shapeoko 3XL #0006 w/ Carbide Compact Router w/0.125″ and ¼″ Carbide 3D precision collets

jfboyd
Posts: 8
Joined: Thu Oct 22, 2015 7:12 pm

Re: Spindle wont go up to clear surface at beginning of job

Post by jfboyd » Tue Apr 19, 2016 3:40 am

Thank you! I will do that !

Belt tensions seems to be good.

WillAdams
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Re: Spindle wont go up to clear surface at beginning of job

Post by WillAdams » Tue Apr 19, 2016 3:43 am

It also starts off lifting up:

Code: Select all

G0X0.000Y0.000Z12.000
Shapeoko 3XL #0006 w/ Carbide Compact Router w/0.125″ and ¼″ Carbide 3D precision collets

DRobs86
Posts: 148
Joined: Fri Jun 05, 2015 4:19 am

Re: Spindle wont go up to clear surface at beginning of job

Post by DRobs86 » Tue Apr 19, 2016 4:33 am

I dont use Create, but I did experince this in Fusion 360. I usually edit the g code to lift to whatever clearance I desire. Another option which I also use is to just start above stock zero at my desird safe height. It will traverse in the xy plane and then move down to your first cutting depth as long as you are running absolute coordinates.

jalapano
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Joined: Fri Aug 28, 2015 3:33 pm

Re: Spindle wont go up to clear surface at beginning of job

Post by jalapano » Wed Apr 20, 2016 2:30 am

I did experince this in Fusion 360. I usually edit the g code to lift to whatever clearance I desire
Can you explain what steps you do edit the gcode to life the it to a safe level. It'd be really helpful, I've hit the problem too.

DRobs86
Posts: 148
Joined: Fri Jun 05, 2015 4:19 am

Re: Spindle wont go up to clear surface at beginning of job

Post by DRobs86 » Wed Apr 20, 2016 5:27 pm

Open G code file in text editor. You may have to rename with a .txt extension to open with notepad (other options too ,but i will keep it simple).

The header of the file will include commands such as:
G90 G94
G21
G17
M3...etc
Then your first xy traverse:
G0 X143.2 Y23.9. (Just as an example, could be any x and y value

Before that first xy traverse, enter a new line and type:
G0 Z6 (6 is just an example, you can use any value you want for a safe height)

Save the file.

There are a couple other ways to handle this, but thats an easy one. Be very mindful though that fusion likes to throw a G54 in the header (still trying to stop that myself, I am sure I need to just look into it). If you are in another work coordinate system (G55, etc) and expecting to run in that, then you are in for trouble. I also delete the G54 command from the header so that I stay in the work coordinate system I selected before running the file.

jalapano
Posts: 21
Joined: Fri Aug 28, 2015 3:33 pm

Re: Spindle wont go up to clear surface at beginning of job

Post by jalapano » Fri Apr 29, 2016 3:11 am

Thanks! (sorry for being late, been super busy)

I'll have some time to try it out this weekend.

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