Mounting PCB's onto acrylic without mounting holes

[Matthew Daubney]

Morning!!!

I have a little motor driver carrier board that I want to mount on an acrylic sheet (with some other stuff) but it has no mounting holes. What's the best way to do this? 3D print a slide in thing for it that can be mounted? The carrier board is one of these if it helps http://www.pololu.com/product/713

-Matt Daubney

[Richard Ibbotson]

How neat must it look, and how robust must it be ?

 

How will you connect to the board ( solder wires, connectors, ..?

 

Clearly these boards are usually supported by their .1" pin connectors to another board.

 

If I were to wire direct to the board with wires, I would probably dress the wires and use a couple of tie wraps around the wires and through the acrylic. If you want to fix the board more secure I like to use the double sided foam sticky pads. You could cut a .8 * .6 hole in the acrylic to locate the board. Boards look pretty cheap, so maybe a temp fix for testing, then a couple of dabs of epoxy if it must be robust?

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[Matthew Daubney]

Ideally I'd like to be able to remove the board and replace it if/when I blow it up :) 

I'm going to wire to it using pin headers and jumper cables. 

It doesn't need to be overly robust, it's going on top of a small 2 wheel drive robot, so the worst it will have is the occasional bump.

Mucking around with openSCAD I got the attached which would just be fricative to hold the board in place and then that could be screwed to the acrylic, it's not quite finished and I need to play with it to make it printable, but would this be Good Enough(tm) do you think?

[Barnaby]

Looks good, I would print it on the side to maximise the strength of the 'uprights'.

[Matthew Daubney]

SCAD's here if you're interested https://github.com/daubers/Robot/blob/master/MotorDriverCarrier.scad

On 30 December 2014 at 11:13, Barnaby <b...@zi.is> wrote:

Looks good, I would print it on the side to maximise the strength of the 'uprights'.

[Alex Gibson]

Pololus could get a bit hot and warp a little bracket… Is weight critical, or could you put a heatsink across both of them, and 3D print a bracket to hold that to the main PCB?

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[Matthew Daubney]

Hi Alex,

This isn't a pololu stepper driver, it's just a DC motor H-Bridge :) It probably will still get a little warm, but not as warm as the little pololu stepper drivers! There's also only one of them, as it's a dual driver chip. I have no idea on the thermals of this chip, so it might be worth keeping an eye on.

[Skipp]

You can buy PCB edge/corner mounts pretty cheaply.

An example from Adafruit here