Search found 42 matches

by philmurp
Wed Dec 04, 2013 7:35 pm
Forum: Electronics
Topic: Operate a Pneumatic air cylinder for Z-Axis movement
Replies: 38
Views: 7092

Re: Operate a Pneumatic air cylinder for Z-Axis movement

So when I try and move my air cylinder in the vertical direction, as it goes up my system randomly seems to catch and loses distance so it can find where it is. I have tried all sorts of things and cannot figure it out. Is there any reason you could see this happening? and more importantly are there...
by philmurp
Mon Dec 02, 2013 3:05 pm
Forum: Assembly
Topic: Limit Switches are causing GRBL to freeze
Replies: 10
Views: 4136

Re: Limit Switches are causing GRBL to freeze

Both issues would be explained by the pull-up resistors being connected together, but not to VCC. That would be my lucky guess. Use your multimeter to check that the limit switches act on D9 and D10 as you expect. Also check that Y switches leave D9 alone and those on X don't affect D10. Measure bo...
by philmurp
Mon Dec 02, 2013 1:48 am
Forum: Assembly
Topic: Limit Switches are causing GRBL to freeze
Replies: 10
Views: 4136

Re: Limit Switches are causing GRBL to freeze

You can always modify GRBL to do what you want. Or, find out what you need to do to take GRBL out of the alarm state, ignoring that Z is not homed. I remember it was in the documentation, but I can't find it. I modified my grbl source code to take out the homing lock and also create a homing cycle ...
by philmurp
Wed Nov 27, 2013 11:31 pm
Forum: Assembly
Topic: Limit Switches are causing GRBL to freeze
Replies: 10
Views: 4136

Re: Limit Switches are causing GRBL to freeze

twforeman wrote:You could just put a manual switch on the Z that you hit when it does that axis...
I was thinking of that, but my goal is to have my process automated with my oversight but no direct input unless emergency. I was hoping there might be a way to set the homing cycle to only set X and Y axis
by philmurp
Wed Nov 27, 2013 7:27 pm
Forum: Assembly
Topic: Limit Switches are causing GRBL to freeze
Replies: 10
Views: 4136

Re: Limit Switches are causing GRBL to freeze

I think this may be a feature, not a bug. I seem to remember reading that GRBL prevents the machine from moving until it knows where it is. Do a homing cycle first ($H), that should unfreeze it. There's also a way to override this, I think. The issue I am having with the Homing Cycle is that I only...
by philmurp
Tue Nov 26, 2013 4:59 pm
Forum: Assembly
Topic: Limit Switches are causing GRBL to freeze
Replies: 10
Views: 4136

Limit Switches are causing GRBL to freeze

So I have wired limit switches into my X and Y axis. When I wire my limit switch, and then enable hard limits with $16=1, I cannot move my steppers. No matter what command I input, it will not execute. It seems like my limit switches are freezing my system. My G-Code Sender doesn't give any alarm or...
by philmurp
Tue Nov 26, 2013 3:41 pm
Forum: Electronics
Topic: Operate a Pneumatic air cylinder for Z-Axis movement
Replies: 38
Views: 7092

Re: Operate a Pneumatic air cylinder for Z-Axis movement

Better than 100 K, for sure. 10 K will be enough in most cases. When I wire my limit switch, and then enable hard limits, I cannot move my steppers. No matter what command I input, it will not execute. It seems like my limit switches are freezing my system. It doesnt give any alarm or any indicatio...
by philmurp
Tue Nov 26, 2013 2:18 am
Forum: Electronics
Topic: Operate a Pneumatic air cylinder for Z-Axis movement
Replies: 38
Views: 7092

Re: Operate a Pneumatic air cylinder for Z-Axis movement

GRBL 0.8c has direct support for limit switches on all three axes, and a separate emergency stop input. You don't need to wire them together, and they're more useful wired separately (because the limit switches can then be used for homing too). GRBL expects the pin to be pulled low when the limit i...
by philmurp
Sun Nov 24, 2013 10:32 pm
Forum: Electronics
Topic: Operate a Pneumatic air cylinder for Z-Axis movement
Replies: 38
Views: 7092

Re: Operate a Pneumatic air cylinder for Z-Axis movement

When using the homing cycle, I only want to home my X and Y axis. So I have installed my limit switches and set $16=1, then I set $17=1, then to do the homing cycle I do: G28.2 X0 Y0 Is that homing setting correct so that it will not attempt to home my Z axis? Also, do you know of a way I can contro...
by philmurp
Fri Nov 22, 2013 7:51 pm
Forum: Electronics
Topic: Operate a Pneumatic air cylinder for Z-Axis movement
Replies: 38
Views: 7092

Re: Operate a Pneumatic air cylinder for Z-Axis movement

I'm pretty sure they mean the working Arduino, the one used as the programmer. I'm also pretty sure, given the SparkFun tutorial, that you can omit that capacitor. I'd say follow the SparkFun tutorial exactly, and you should be fine. Upgrade Successful to .8c. Used the sparkfun tutorial, thanks for...