Search found 135 matches

by potatotron
Thu Oct 25, 2012 11:42 pm
Forum: GRBL
Topic: Arduino Mega 2560 & RAMPS
Replies: 16
Views: 12215

Re: Arduino Mega 2560 & RAMPS

I believe forgottenCNC is correct. Additionally, the design of GRBL requires the step and direction bits to be on the same port; you would have to go deep into the code to modify things if you wanted e.g. X stepper to be on port C and X direction to be on port D. This is the default config for GRBL:...
by potatotron
Thu Oct 11, 2012 10:19 pm
Forum: Discussion
Topic: PRINTING
Replies: 11
Views: 2448

Re: PRINTING

jc21 wrote:how do i invert the z polarity? its the motor current on the grblshield?
See the section "$7 - invert mask" here:

https://github.com/grbl/grbl/wiki/Configuring-Grbl

My guess is add 128 to the current value of $7.

GOOD LUCK!
by potatotron
Sun Oct 07, 2012 7:14 pm
Forum: Other - (etchers, drag knifes, lasers)
Topic: how to modify GRBL for Z axis to tool ON OFF
Replies: 15
Views: 16888

Re: how to modify GRBL for Z axis to tool ON OFF

With GRBL the default is Arduino pins are D12 for spindle enable and D13 for spindle direction. See this page: https://github.com/grbl/grbl/wiki/GRBL-Pinout You can change this to whatever you want by getting the source code, editing config.h, and recompiling. Instructions on that are here: https://...
by potatotron
Thu Oct 04, 2012 11:29 pm
Forum: Other - (etchers, drag knifes, lasers)
Topic: how to modify GRBL for Z axis to tool ON OFF
Replies: 15
Views: 16888

Re: how to modify GRBL for Z axis to tool ON OFF

I think the easiest thing would be to connect a relay to your laser and control the relay from the spindle pin. Then you could use the normal G codes M3 (enable spindle) and M5 (turn spindle off) to control it. I did something similar for my ShapeOko pick and place machine; instead of controlling a ...
by potatotron
Wed Oct 03, 2012 7:30 pm
Forum: For Sale
Topic: ACME screw upgrade for Shapeoko Z-Axis
Replies: 175
Views: 44518

Re: ACME screw upgrade for Shapeoko Z-Axis

IC - thanks for coming up with this, I just ordered mine. Great timing, I've been really busy with my day job for the last few months and am just getting back to my ShapeOko pick and place machine. One big outstanding problem has been the speed of the Z axis; it limits how fast I can place component...
by potatotron
Mon Sep 17, 2012 3:56 pm
Forum: Electronics
Topic: Wires
Replies: 2
Views: 636

Re: Wires

Yes, that should be fine. 18 Gauge wire can carry much more current than you're going to send to your steppers.

Good luck!
by potatotron
Thu Sep 13, 2012 2:26 pm
Forum: Electronics
Topic: Which is the best PCB fabrication company?
Replies: 5
Views: 2243

Re: Which is the best PCB fabrication company?

You didn't say what country you're from; that can skew the answer. You also didn't say if you want 1 PCB, 10, or 10,000. That definitely skews the answer. Here are the companies I've worked with: Very cheap and reasonable quality - seeestudio and iteadstudio (they use the same factory) Reasonably ch...
by potatotron
Sat Sep 08, 2012 5:03 am
Forum: GRBL
Topic: GRBL on arduino pro mini?
Replies: 4
Views: 4074

Re: GRBL on arduino pro mini?

I just got done running some basic tests with GRBL on my Nano and no problems. I spun a motor, verified the spindle relay pin went on/off with a multimeter, and made some param changes and verified they stayed after a power cycle. All good. I didn't know about the Nokia cable trick; very cool info. ...
by potatotron
Thu Sep 06, 2012 3:52 pm
Forum: GRBL
Topic: bricked a uno, looking for explanations
Replies: 11
Views: 4469

Re: bricked a uno, looking for explanations

Haha I do need to straighten out my priorities...working for the man is dragging me down... I think I can program the main chip in another board and then plug back in to this one and it will run a program (I wont be able to load programs using this arduino). Yep, you can definitely do that. Just be ...
by potatotron
Thu Sep 06, 2012 3:38 pm
Forum: GRBL
Topic: GRBL on arduino pro mini?
Replies: 4
Views: 4074

Re: GRBL on arduino pro mini?

The Nano should not be a problem; as you say it's using the same chip (ATMega328) as the Uno. I have a Nano, if you want I can try installing GRBL on it this weekend.

The Pro Mini doesn't have a serial chip so yes you could install GRBL on it, but you won't have any way to send G code to it.