Control box build

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02 Sep 2020 14:54 #180440 by kbec
Control box build was created by kbec
I am building my system with a Mesa 7I96 card, some stepperonline stepper drivers and some switches and power supplies.

I was wondering mainly about mounting the card to the box. Does it need to be mounted on non conductive stand offs? How do you guys normally fasten your boards to the box? I am guessing the stepper drivers and power supplies can just be kind of bolted on, but I don't want to break the board.

Thanks

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02 Sep 2020 15:17 #180441 by PCW
Replied by PCW on topic Control box build
You can use metal stand-offs, the mounting holes are insulated
You can also get the DIN rail mounts if you prefer
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02 Sep 2020 20:33 #180464 by AgentWD40
Replied by AgentWD40 on topic Control box build
I used M3 screw through a mounting hole, then a nut to fix the screw to the panel, then a nylon spacer from the big box store, then the card, then finally a nut to secure the card. I didn't feel like waiting in proper standoffs in the mail.

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05 Sep 2020 03:34 #180777 by OT-CNC
Replied by OT-CNC on topic Control box build
I prefer Mesa's DIN mounts. They are nicely machined with chamfered edges, consistent hole patterns and heights. We just need to convince Peter to make some that fit the smaller boards. I'm lazy and don't like modifying them.
What I like about the DIN rail system is that it offers flexibility in layout. I hate drilling and tapping inside electrical enclosures. Once the rail is screwed in place you just clip your components to it. Power supplies, terminals, fuses, relays etc. Makes for a clean install.
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05 Sep 2020 07:58 - 05 Sep 2020 09:06 #180790 by Clive S
Replied by Clive S on topic Control box build
I use these:
www.ebay.co.uk/itm/PCB-DRG-01-04-DIN-Rai...f:g:JmIAAOSw1g9fTwLr
But are much cheaper on aliexpress . All the dimensions for the drilling are in the manuals for each card.

mesa 7i96

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test jig.

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Last edit: 05 Sep 2020 09:06 by Clive S. Reason: added pics

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21 Nov 2020 22:55 #190012 by kbec
Replied by kbec on topic Control box build
How big are your control boxes? I am about to the point where things are working like I want them to and finalize it, but the way I drew it out it will be about 14 x 20 inches.
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22 Nov 2020 06:02 #190024 by Himarc3D
Replied by Himarc3D on topic Control box build
What’s the depth of your cabinet?
Whats the size of your 36V?

The size i think is based in what you plan too have, push button, switch, leds, display at cabinet door, circuit protection; fuse, breaker, etc.

You can use the cabinet door to mount the Mesa or 36V if you dont have nothing connected to the door...you csn use the laterals for comand stuff.
If you dont have yet they sell 24/12/5V power suplly 3 in 1 cheap price and very small sharing the common.
If this is mine ill put from left to right CP, PSU, DM542 and Mesa.
Input usually from UP and output Down
Heres one example for you if you have depth:
forum.linuxcnc.org/plasma-laser/39792-co...d-for-plasma?start=0

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23 Nov 2020 00:06 #190089 by OT-CNC
Replied by OT-CNC on topic Control box build
Looks a bit tight to me. Going by memory, my 18"x24" or so cabinet on my mill was too tight to mount 4 drives, PSs, relays, contactor, fuses/breakers and 7i77 comfortably. The 7i77 sits in another box. I know your setup is different and may just work fine.
In general I found that in the areas where the wires pass through your cabinet you want room as the harnesses can add up in size quickly. Same goes for the star ground location. Also add a few extra holes in the box for future expandability. Maybe a fan for cooling as well?

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23 Nov 2020 05:27 #190097 by Aciera
Replied by Aciera on topic Control box build
You might want to mount the drivers vertically. Stacking them up like that is not very good for cooling.

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23 Nov 2020 12:55 #190111 by rodw
Replied by rodw on topic Control box build

You might want to mount the drivers vertically. Stacking them up like that is not very good for cooling.


X 2. I just learnt the hard way that the top drive can get too hot and fault with the ones below it heating them up!

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