grblshield and Z axis

DrRob
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Re: grblshield and Z axis

Post by DrRob » Tue Jun 05, 2012 1:55 pm

nio wrote:So i've 200 steps motor on X and Y axis, and 400 steps in Z axis (kickstarter kit), do i have to set $2 to 320?? or 640??
As Edward said, it depends on what stepping mode you have set on your stepper drivers. You can experiment with different parameters on the grbl calculator, and then copy the settings into grbl:

http://noblesque.org.uk/ShapeOko/grblca ... crosteps=2

(I've just made a small tweak to the page so that initial settings can be passed in the URL, so I've preconfigured it here to match your 200 steps/rev motors for X/Y and 400 steps/rev for Z.)

Rob.

nio
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Re: grblshield and Z axis

Post by nio » Tue Jun 05, 2012 4:59 pm

Thanks guys!!!

nio
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Re: grblshield and Z axis

Post by nio » Tue Jun 05, 2012 7:34 pm

i'm going to cut the trace, solder a wire and set these settings: (Dr.Rob thanks for the tool :))
$0=43.74453193350831
$1=43.74453193350831
$2=640
$3=3
$4=750
$5=1500
$6=0.1
$7=0
$8=9.8
$9=0.05

cross finger :?

nio
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Re: grblshield and Z axis

Post by nio » Tue Jun 05, 2012 11:00 pm

Ufff now my z axis is quite fast.... yesterday i did my first test, and i was happy although i put 1mm for total length and it was not so (the H shape), but today with this new settings and the cut trace and solder the wire, if i put 0.2 in depth increment is enough, but my Z axis is loosen, and i've to adjust again....(circle with some letters inside)

Image


I've to do more tests, but i think my Z axis is not well calibrated and my parameters are not the best...

nio
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Re: grblshield and Z axis

Post by nio » Wed Jun 06, 2012 7:17 am

edwardrford wrote:The good news is that we were all new to CNC once :-)

Some people forget that, but the amount of time and frustration I experienced when I was new to CNC has stuck with me, and part of the project is to get people past that feeling as quickly as possible! It looks like you're close to getting something going, so let's focus on your controller.

What stepper controller are you using? (Buildlog.net stepper shield or grblShield or DrRob's Board or something else?)

It might be easier if you attach a picture of your controller for us.

-Edward
I'm using grblshield, with the kickstarter kit, so X/Y 200 steps motors, and Z 400 steps motors..... and i did the modification cutting the trace and soldering a wire, to get 2x on the Z axis....

nio
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Re: grblshield and Z axis

Post by nio » Wed Jun 06, 2012 9:25 pm

Some more tests.....
For me it works better with
$2=320
$5=800
?¿

edwardrford
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Re: grblshield and Z axis

Post by edwardrford » Wed Jun 06, 2012 9:32 pm

Are we talking about just the z-axis here? I'm assuming that your X/Y are both dialed in and doing what they're supposed to do. Is that correct?

Can you freely spin the threaded rod with your fingers (when the power is not on to the stepper motors)?

-Edward
Shapeoko 1 #0 - a couple of upgrades.
Shapeoko 2 #0 - a couple of upgrades.
Shapeoko 3 #2 - Stock

nio
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Re: grblshield and Z axis

Post by nio » Wed Jun 06, 2012 10:06 pm

Yes, X/y does what they're supposed to do... and the Z i can freely spin the threaded rod, but i fell that not all the time i've to do the same strength, i mean, sometimes it's harder, not too much, but a little bit...

edwardrford
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Re: grblshield and Z axis

Post by edwardrford » Thu Jun 07, 2012 1:42 pm

Having different friction in the z is pretty normal for the Shapeoko. I tried mine last night just for fun and found that at certain points during the axis travel, it was easier/harder to spin the coupler. Slightly, but the variance was definitely there.

So where are we on this Nio? Do you think it's working now, or are you still having issues with your z-axis? I'm imagining that at your current settings it's pretty slow, you may want to bump up you acceleration settings a little bit at a time. Start from 15 and go up in increments of 5 until you start stalling the motors. My guess is somewhere around 30 will work great.

Keep us posted!

-Edward
Shapeoko 1 #0 - a couple of upgrades.
Shapeoko 2 #0 - a couple of upgrades.
Shapeoko 3 #2 - Stock

nio
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Joined: Mon Apr 09, 2012 7:31 pm

Re: grblshield and Z axis

Post by nio » Thu Jun 07, 2012 7:02 pm

So now i'm going to do a new mount and will put my new proxxon (ib/e), because i don't know if some problems could be about the mount i did for my old proxxon.... then i'll do more tests...
when you say accelaration setting you mean $5?? :oops:

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