Machsupport Forum

Mach Discussion => FAQs => Topic started by: jeverett915 on December 22, 2015, 10:46:44 AM

Title: Need help with bob I/O and mach3 for plasma table
Post by: jeverett915 on December 22, 2015, 10:46:44 AM

I need help to wire up my db25 bob to work with mach3. Heres what i have so far,output pins 2,3,4,5,6,7,8,9 are x,a,y,z step and direction. that leaves me pins 1,14,16,17 available. input pins 12,13 are thc +,- that leaves pins 10,11,15 open on the inputs. now heres my problem i still have arc okay, x,a,y and z home to wire in but only have pins 10,11,15 open on my bob. can i use output pins for home switches and configure them in mach? thank you for your advice.

Title: Re: Need help with bob I/O and mach3 for plasma table
Post by: Greolt on December 22, 2015, 04:32:31 PM

Mach3 will handle all the home switches on one input pin.  Wired NC in series

Provided you do not use slaved axis homing.  You would then need A on a separate pin.

Don't forget that you will need ArcOK input.   Also if using a floating head then you will need probe input.

THC+
THC-
ArcOK
Probe
Home switches.

You should get away with that

Title: Re: Need help with bob I/O and mach3 for plasma table
Post by: BR549 on December 22, 2015, 04:53:48 PM

With plasma and a stepper machine you really do not need HOME or limits   to do 99% of all your work.

You base all your work from Work Zero and you set that by hand every time you setup a new cutfile.

Do all your Cad/Cam work with 0,0 being lower left and you can't really mess up.

Just a thought, (;-) TP

Title: Re: Need help with bob I/O and mach3 for plasma table
Post by: jeverett915 on December 24, 2015, 09:26:15 AM

Thanks for the replys, im going to run with the basics for now ,thc+,-, arc ok ,and z home for touch & go. thinking i will update to a usb bob after a while which will give me some room to grow later ,pipe cutter plate marker ect.