BeagleBone Black saw length stop

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31 Aug 2014 08:13 #50541 by tsmutz5
Hi guys. I’m looking for input on this project. Any help is hugely appreciated!

I’m in the planning phase of building an automatic length stop/pusher for my cold saw (later on I’ll start working on further automating the saw but for now the length stop is enough).
Something like a Tigerstop is what I’m going for (see video)


I’ve got a good handle on the mechanical aspect of the build.

What I’m looking to accomplish is two modes

Absolute mode work flow:
• punch in a position for the carriage (stop) to travel to,
• operator clamps the material
• cut
• unclamp
• remove piece
• punch in new position
• repeat

Push mode work flow:
• Load material
• End trim cut
• Punch in cut length
• Carriage pushes material to length + saw kerf parameter
• Cut
• Unclamp
• Punch in new length
• Carriage pushes material to length + saw kerf parameter
• repeat



This is what I’m thinking of using for hardware.

The machinekit port for the BeagleBone.
blog.machinekit.io/p/machinekit_16.html

1: BeagleBone Black with 7” touch screen
www.ebay.com/itm/261474067586

1: PBX-BB BeagleBone Breakout Board
www.probotix.com/index.php?view=product&path=16&product_id=204

1: Hybrid stepper motor to drive carriage
www.ebay.com/itm/151337079860?_trksid=p2...e=STRK%3AMEBIDX%3AIT

1: Inductive Proximity Sensor Switch NPN DC6-36V for homing
www.ebay.com/itm/371031316393?_trksid=p2...e=STRK%3AMEBIDX%3AIT

Thanks for any and all input!

Tyler

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01 Sep 2014 23:59 #50588 by andypugh
I think if I was doing this I would be planning to use a Glade GUI and Python to operate HAL pins directly. So no G-code interpreter and not much of LinuxCNC except for HAL.

A less radical solution would be to load your Glade GUI as the active GUI, and pass command straight to Motion using the Python interface.
The following user(s) said Thank You: tsmutz5

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03 Sep 2014 02:42 #50647 by tsmutz5
Thanks Andy.

I think the Glade GUI and Python sounds like a good idea.

One other idea: Could a NGCGUI macro work to enter a single cut or a short list for a single piece of stock and then basically run in single line mode? ala your lathe interface?




Thanks for your input!

Tyler

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03 Sep 2014 04:50 #50651 by newbynobi
Just use MDI commands, so you can enter as much as you like. If you need to change matirial, just give an M1 comand.

Thats all.

Norbert

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03 Sep 2014 20:19 #50686 by andypugh

Could a NGCGUI macro work to enter a single cut or a short list for a single piece of stock and then basically run in single line mode? ala your lathe interface?


I don't think you need NGCGUI for this. Instead just use a single fixed bit of G-code.

As a starting point you could use my lathe macros and just change the underlying G-code to do different things with the same number inputs. (tool number = number of parts, Z position = length of cut, thar sort of thing). Worry about making the GUI sensible for the task at hand later.

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20 Jun 2015 03:17 #60004 by Todd Zuercher
Sorry to revive/hijack an old thread, but I want to build a gui for doing this very thing.

linuxcnc.org/index.php/english/forum/48-...user-interface#60003

I am curious if the fellow who started this thread ever got anywhere with his project?

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