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Any interest in a breakout to tidy up the wiring?

Posted: Thu Nov 08, 2012 9:04 pm
by goopyplastic
Been thinking of the best way to do this and I think a breakout pcb might be beneficial to those running grbl electronics

Here is what I am thinking; essentially you run your wires from the arduino / grblshield to the breakout pcb, the pcb then gets mounted to an enclosure etc.. so you have easy modular access to all of the steppers / limit switches / etc... This makes the wiring much cleaner and lets you easily move your grbl controller to other projects.

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Kinda what I have in mind

These are all molex KK 100 series connectors so pretty small but they can still handle 3-4amps

4x 4 pin stepper ports let you wire in a dual axis if you want
- traces on both sides
6x limit switch ports
- jumpers let you tie both limit switches for each axis together
- optional pull-up / pull-down path with spot for resistor
1x reset switch
- with your grbl in an enclosure you need another reset button
1x fan header
- wire this to your 9v barrel connector on the arduino
4x #4 mounting holes

The current size is 3.50 inches x 1.35 inches so through dorkbotpdx they should be about $7.83 a piece. The molex housings / pins etc.. would be about $6 also ... these are the costs from vendor.

What do you think, am I missing something?

Re: Any interest in a breakout to tidy up the wiring?

Posted: Fri Nov 09, 2012 3:47 am
by dointhangs
I like this a lot, I need to work on this on my machine and this would help. Yes interested. These molex polarized connectors you refer to are certainly satisfactory but I really like the look of these "panel mount" connectors going into an enclosure... https://www.sparkfun.com/products/11475
Can the "solder cup" connectors be plugged into a breakout though? I would definitely be happy enough with those molex but that could be really slick? And this other ribbon stuff looks kind of interesting too? https://www.sparkfun.com/products/10646
Re your drawing - does the main power from the power supply come into that too or is that a seperate deal?

Re: Any interest in a breakout to tidy up the wiring?

Posted: Fri Nov 09, 2012 4:38 pm
by cvoinescu
@doingthangs, that's the type of cable I am using, temporarily. It comes in various widths (numbers of wires), up to at least 60, and it can be split arbitrarily (it tears cleanly). It's a bit on the thin side for steppers; I would prefer something with a little more copper. It's perfectly fine for limit switches, though.

Re: Any interest in a breakout to tidy up the wiring?

Posted: Fri Nov 09, 2012 7:12 pm
by goopyplastic
Ya I actually really like rainbow ribbon it is just so purdy, but 28awg is less than the 26awg on the nema 17's so I haven't used it, so limits it would work fine (bordering on too thick).

After wiring a temporary enclosure up manually last night ... I never want to do it again, the breakout is definitely in my future. I ordered 3 from dorkbot pdx to see how it will work out and what changes might be necessary.

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You can use polorized molex or jst-xh, jst seems a little cheaper and has better retention but is harder to find and harder for the average person to crimp, the panel mount connectors are great and screaming for a sheet metal enclosure however I want to keep the grbl setup as small as reasonable (because I am sticking it on the back of my vertical mill) ... so I am going this route for now. If I were going for elaborate, a sheet metal enclosure and panel mount connectors I would probably go with gecko drivers and just wire them in to an arduino and skip the shield ... but that is bucks.

@doing currently no, the 24v power does not connect to the breakout as the amperage would require a different connector. Also as you can see from the test housing above there are 2 ends of the enclosure ... one end that goes to the mill, one end that goes to the computer, no compelling real reason to route the power around the back when the front of the arduino needs usb and 9v power (for the fan) it's not too much to just add a pigtail or panel mount barrel adapter for the 24v psu.

Re: Any interest in a breakout to tidy up the wiring?

Posted: Sun Nov 11, 2012 3:23 am
by edwardrford
That is one sexy stand/wiring enclosure! Is that on thingiverse?

-Edward

Re: Any interest in a breakout to tidy up the wiring?

Posted: Sun Nov 11, 2012 8:09 pm
by ZachKaplan
Do you find it is more effective to have the fan on top or blowing from the side?

Re: Any interest in a breakout to tidy up the wiring?

Posted: Sun Nov 11, 2012 8:47 pm
by goopyplastic
http://www.thingiverse.com/thing:34285

I will warn you, getting the lengths of the cables correct and grouping the limit switches into the male header is not what I would call fun ;)

Re: Any interest in a breakout to tidy up the wiring?

Posted: Tue Nov 13, 2012 4:23 am
by edwardrford
I really like this box. Looking at it, i have a couple ideas of how it could be made on Shapeoko. A secondary op (drilling) would be necessary but could be made easier with some side marks to help with location. Very very nice work.

-Edward

Re: Any interest in a breakout to tidy up the wiring?

Posted: Mon Nov 26, 2012 4:14 am
by alpha
You may want to consider adding three more connections for the new buttons - as far as my memory serves me:
A0 - Reset (but unlike hard reset this will keep position)
A1 - feed hold
A2 - cycle (re)start
to GND


I just wired the buttons this weekend and it works good - it's nice to be able to pause it at any moment and restart.

Re: Any interest in a breakout to tidy up the wiring?

Posted: Mon Dec 17, 2012 3:07 am
by goopyplastic
alpha, good suggestions will try and include later on.

here is a quick update:

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I desperately need to switch over to PLA though, too much curling with the ABS.