| Electronics > Projects, Designs, and Technical Stuff |
| Electrical contacting on aluminium busbar |
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| T3sl4co1l:
Lockwire serves the same purpose as Nord-Lock but with cheaper materials and way more manual labor (and possibly less retention torque, depending on the stretchiness and ultimate tensile limit of the wire, and give or take how long the wire is to the tie point?). --- Quote from: David Hess on March 03, 2019, 03:52:04 pm ---I would love to use Belleville washers more for power transistor mounting but pricing and availability has always been a problem. --- End quote --- That never made sense to me... they can potentially be produced in a single stroke like any other washer. Is it just a quantity thing -- they're expensive because no one wants them because they're expensive?... :palm: The ridged ones I can see being more expensive or specialty, I guess, but still. 'Spose this is a good situation to shop China... ;D --- Quote ---When it matters, I end up stacking wave washers to get enough force. --- End quote --- Indeed, wave washers add in parallel when stacked. :) (They add in series if you can keep them aligned peak-to-peak rather than peak-to-trough, but that would be hard without keying.) Belleville also add in parallel when stacked in nested-cups direction, or in series when stacked oppositely, rim-to-rim. Series meaning, more displacement but the same force; parallel, more force but same displacement. Tim |
| dmills:
Belleville is a trade name for a type of "Disk Spring" that may be more readily available under that name. I tend to keep a box of M3/4/5 on the general mechanical bits shelf, they are useful. FR4 flows, a lot, so directly bolted connections are not a great idea, but you can get press fit inserts from the likes of Erni and Wurth that make heavy current bolted connections to PCBs a far more viable thing. Regards, Dan. |
| coppercone2:
don't you want to drill a hole and solder in a insert to a PCB? |
| damien22:
We are currently looking to have tin plated or zinc plated aluminium busbar, waiting for feedback from some suppliers. Here is a picture of how it looks like and also explains the dimensional constraints. http://imgur.com/a/bWYE9om https://imgur.com/a/bWYE9om (image tag not working ?) |
| David Hess:
--- Quote from: T3sl4co1l on March 03, 2019, 08:00:11 pm --- --- Quote from: David Hess on March 03, 2019, 03:52:04 pm ---I would love to use Belleville washers more for power transistor mounting but pricing and availability has always been a problem. --- End quote --- That never made sense to me... they can potentially be produced in a single stroke like any other washer. Is it just a quantity thing -- they're expensive because no one wants them because they're expensive?... :palm: --- End quote --- I have always assumed it is a quantity issue. Wave washers have more applications than Belleville washers and people use split washers in place of both even when they should not. |
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