Trimming Propeller proto board?

FranklinFranklin Posts: 4,747
edited 2011-07-23 - 23:52:45 in Propeller 1
How much can I trim off a non usb propeller proto board without breaking the circuits?Ineed to make it smaller and can't see spending $50 for the prop stick. Thanks.


  • WBA ConsultingWBA Consulting Posts: 2,927
    edited 2011-07-21 - 21:45:20
    You can actualy trim it all the way down to 1.2" square as long as you provide the power supply and connections for programming. See attached. Also, see the link to my $20 M44D40+ module in my signature. It is the full basic prop circuit in a DIP40 formfactor.
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  • idbruceidbruce Posts: 6,168
    edited 2011-07-21 - 22:48:58

    You may also want to view this thread

    @WBA Consulting - I would have never guessed that it could be trimmed down that far, although I suppose a close inspection of the gerbers and schematic would have shown just how far a board could be trimmed.

  • WBA ConsultingWBA Consulting Posts: 2,927
    edited 2011-07-21 - 23:11:25
    idbruce: Yes, it was designed with the main circuit isolated from everything else, so hacking it down works beautifully. Also, I take no credit for the research in determining that it could be. Oldbitcollector had it posted somewhere years ago. I only take credit for the graphic I made when I was determining how to cram an entire setup into a tiny enclosure.
  • Jim FouchJim Fouch Posts: 395
    edited 2011-07-22 - 09:00:18
    I could see taking the time to write a program for my CNC that would do this.

    If anyone would be interested in having me do this as a service, let me know. I'm sure I could get it to a point that it takes less than a minute to cut a board perfect every time. Even have the option to leave some of the prototyping area intact.
  • CannibalRoboticsCannibalRobotics Posts: 535
    edited 2011-07-22 - 09:10:34
    I had to trim one down about 1/4" to fit into a rail mount chasis. I just pressed it down on a peice of plywood and ran it past my band saw.
    A little barbaric but at the end of the day, it worked great and only took about 30 seconds.
  • Cluso99Cluso99 Posts: 17,144
    edited 2011-07-22 - 16:31:32
    I have ordered initial qties of my 1"x1" CpuBlade and they should be back in 2-3 weeks.
  • WBA ConsultingWBA Consulting Posts: 2,927
    edited 2011-07-23 - 14:03:54
    Mike, thanks for the link! I got word of it from OBC a long time ago, but it appears he may have gotten it from you!
  • WBA ConsultingWBA Consulting Posts: 2,927
    edited 2011-07-23 - 23:41:24
    I just finished trimming a proto board for a project I am working on called "Svara". The attached drawing shows a portion of the desired part stackup inside a Polycase WC-20 NEMA enclosure. I decided on a proto board instead of my M44D40+ module because I wanted some extra proto space and didn't want to have to add some proto board to my module. Trimming down a proto board resolves my pickiness.

    I created a 1:1 layout in Visio using the WC-20 Drawing PDF and some boxes set for the size of the PCB, Sparkfun LiPo battery pack, and the uOLED Display sold by Parallax. What's not seen in the stackup is the XBee, battery charging board, and tilt switch that will also be crammed in this enclosure. The gap between the PCB and the top and left of the case is for the XBee and wire travel.

    I then cutout the layout that was printed on paper, taped it to the board, then started trimming it down.

    I used a nibbling tool plus made some design changes while trimming, so the finished size is different from the drawing:

    And it fits very nicely into the WC-20 enclosure as intended:

    Now my Svara project can continue to the next step: Fit Test of all components. Gonna play Tetris for a bit to get ready for that.........
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  • idbruceidbruce Posts: 6,168
    edited 2011-07-23 - 23:52:45

    Thanks for the link to Polycase, that is a nice link to have :)

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