cable lengths question

alpha
Posts: 174
Joined: Thu Apr 12, 2012 2:49 pm

cable lengths question

Post by alpha » Wed Apr 18, 2012 8:37 pm

My GrblShield arrived today and I found out now I need those connectors:

source: http://www.synthetos.com/forums/topic.php?id=197
Store: Jameco
463443 @CONN,HOUSING,NYLON,4 POS, 10 .15 1.50
736561 @156 KK TERM LOOSE TFT 18-20 50 .08 4.00

I would like to complete the electronics and cabling part before I get the kit after 60 days. I was not able to find any information in the wiki (did I overlooked something?) regarding the cable length... someone, please respond with the length for x,y, and z cables that work the best. Or is there a set of cables with connectors I can order. If not, what cable should I use, I guess 16-18 AWG should work? Any information regarding any other cables?

Thanks,
Markus

edwardrford
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Re: cable lengths question

Post by edwardrford » Wed Apr 18, 2012 8:54 pm

Sorry to hear about the connectors.

As far as stepper cables go: I use something similar to Belden 8444. It's a 4 conductor 22ga cable. But, you can use anything from 18-22ga wire and be fine.
Shapeoko 1 #0 - a couple of upgrades.
Shapeoko 2 #0 - a couple of upgrades.
Shapeoko 3 #2 - Stock

aldenhart
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Re: cable lengths question

Post by aldenhart » Thu Apr 19, 2012 2:36 am

I usually just look up 4 conductor shielded cable on Ebay. Any 20 gauge or larger (i.e. 18ga, 16 ga) will do for the motors needed for Shapeoko. 22ga will work, too, but that's getting a little thin.

edwardrford
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Re: cable lengths question

Post by edwardrford » Thu Apr 19, 2012 2:40 am

I stand corrected :D
Shapeoko 1 #0 - a couple of upgrades.
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MLange
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Re: cable lengths question

Post by MLange » Thu Apr 19, 2012 2:40 am

edwardrford wrote:As far as stepper cables go: I use something similar to Belden 8444. It's a 4 conductor 22ga cable. But, you can use anything from 18-22ga wire and be fine.
Interesting. Would you suggest split-loom tubing or spiral-wrap to help avoid kinking the wires?
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edwardrford
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Re: cable lengths question

Post by edwardrford » Thu Apr 19, 2012 2:47 am

We started talking about a wire management system (shapeoko created of course!) over on the old google group.

Prior to the current proposed linkage setup I was suggesting a simple flexible wire be used to support the cables. In fact, my original setup consisted of 1 wire (a piece of sprung steel from an orange utility flag) to support all of the wires running to the X and Z axis, along with the power cord for the spindle. It worked well. Really well. Wasn't the best looking deal though.

There is of course cable trays/cable races/cable chain, that can be had for not too much $ through the typical sources (aliexpress, alibaba, ebay). If you want something from a reputable place like iges or mcmaster you'll pay through the nose for it though.

-Edward
Shapeoko 1 #0 - a couple of upgrades.
Shapeoko 2 #0 - a couple of upgrades.
Shapeoko 3 #2 - Stock

Enraged
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Re: cable lengths question

Post by Enraged » Thu Apr 19, 2012 3:48 am

regarding cable manangement, why not try making this: http://www.thingiverse.com/thing:1003

alpha
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Re: cable lengths question

Post by alpha » Thu Apr 19, 2012 1:37 pm

Thanks for all the input!

What are a piratical length for the different cables? Like 1m for the y and 2m for the x and 2.1m for z??? More or less?

Thanks

aldenhart
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Re: cable lengths question

Post by aldenhart » Thu Apr 19, 2012 6:21 pm

If your wire size is sufficient it really shouldn't matter. 1,2,3 meters or even more. We've run NEMA23's over 10 meters building a giant cable robot (like a stadium SkyCam camera). Here's a small one:
http://makeprojects.com/Project/Build-a-Wirebot/744/1

edwardrford
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Re: cable lengths question

Post by edwardrford » Thu Apr 19, 2012 6:33 pm

Specifically for the Shapeoko, your wirelength should be enough to get from the furthest point in the X axis, with the z at it's maximum height, back to the Y motor mount, and then back to clear the rear plate. The total length of that would be roughly 900mm for the X and Z motors. For the Y motor you only need ~500mm when you take into account wire routing and niceties like zip ties :-)

I like to put my electronics off to the side, behind the machine, so my cables are a little longer than absolutely needed. Just guessing here, but probably 1.25m for x and Z and about 1 meter for the Y axis.

The best way I have found to determine cable length is to run each cable individually to the point you want to terminate it. Then, add a couple inches and lop it off. Repeat for each motor. Doing it that way you'll be sure not to short yourself.

-Edward
Shapeoko 1 #0 - a couple of upgrades.
Shapeoko 2 #0 - a couple of upgrades.
Shapeoko 3 #2 - Stock

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