Hi - I am working on a board where I will have three PCBs at right angles to each other. Thus they'll have one common corner and three shared edges. These boards need to be exactly at right angles to each other, and they can't be allowed to move. Are there any premade solutions for holding boards at right angles to each other? Surely something like this exists?
Thanks!
-Michael
DIMM socket
Mount them in the corner of a box, with standoffs?
Good Luck! Rich
Hot Melt glue ??
Row of wires out of one pcb soldered into the other
D from BC
Put an exposed copper strip along each edge, and just solder the edges directly together.
Maybe I wasn't specific enough... They need to be at exactly 90 degrees to each other. A degree error would be very significant...
This would work if I didn't have as stringent of accuracy requirements. They need to be at 90 degrees plus or minus a tenth of a degree or so. Initial production numbers will be fairly low (~100) so they will be hand assembled. ) soI wouldso
The boards are something along the lines of 3cmx3cm. Dimm sockets are too big I think.
Aluminum block with a slot in it.. D from BC
I do not believe you will find and off the shelf solution with less the
1 degree error on each side.Temperature will move any stand off or fastener beyond 1 degree true.
Sounds like a Stainless steel frame with holes for the boards. Then the wiring can be anything you like.
The sides won't move after that.
Please send pictures of what ever you come up with.
donald
So clamp them to a precision block before soldering.
D from BC wrote in news: snipped-for-privacy@4ax.com:
Like this; _|_ or like this; |_| ?
TEK used to use 1/4" aluminum blocks,drilled and tapped for 4-40 screws,one block at each corner.
If you leave a strip or tabs of copper at the edges,you could solder the PCBs together. I've made boxes for detectors that way,using copper-clad epoxy-glass.
-- Jim Yanik jyanik at kua.net
Keystone makes threaded "L" brackets which could work. They look to be bent in a pressbrake though and will most likely not give the sub 1 degree accuracy you need. With that type of accuracy, you'll need a machined block.
Chris
Have you priced 3-axis accelerometers rather than trying to build your own?
There are two-part connectors for mounting cards to a motherboard; DIN connectors like Nubus used (see DigiKey part # H1020-ND for example). Of course, to fix three right-angle-edges, will take a half dozen connectors. Figure $3 each...
A welded or brazed steel frame might be easiest in the long run. You can fine-tune the angles easily, if your hammer skills are good.
There are two-part connectors for mounting cards to a motherboard; DIN connectors like Nubus used (see DigiKey part # H1020-ND for example). Of course, to fix three right-angle-edges, will take a half dozen connectors. Figure $3 each...
A welded or brazed steel frame might be easiest in the long run. You can fine-tune the angles easily, if your hammer skills are good.
Mill a groove (not through) in the PCB to be mated to that is a few mils over one PCB thickness wide. Place the copper strips along each side of the groove. Put copper on the edge of the mating PCB, and let the groove be what maintains the right angle. Solder the strips. VIOLA!
As long as the PCB is rigid (use 90 mill PCB for the grooved one), you are set. You can break up the strips into segments so they do not all need to be soldered at once.
My fee is 0.25% of your net. :-]
3 cm on a side is pretty small compared to those behemoths.
The bear growls... Grrrr.
How about attaching them to the outside of a cube? You would have to keep all the components on one side to do it.
You may want to consider increasing the number of PCBs to six. The unsupported corners are going to cause you trouble,
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