[TriEmbed] removing the "bumps" from OSH Park boards

Glen Smith mrglenasmith at gmail.com
Mon Jul 20 18:25:02 CDT 2020

It's been a while since I had to do this on any kind of scale, but a small
diamond whetstone works great on the edges of PCB's to get rid of the bumps
as well as the nasty rough edges. It can be used with water to keep the
dust down.

Working with a PCB that has the edges smoothed in this way feels a little
bit decadent, but it sure is nice not to have them grabbing back with those


On Mon, Jul 20, 2020, 4:34 PM Pete Soper via TriEmbed <triembed at triembed.org>

> I found the perfect tool: a large diameter grindstone in a fixed
> position Dremel (i.e. mounted in a press or something). It's perfect for
> very quickly knocking the bumps off and you can make the edges as close
> to flat as your eyesight and hands allow. Getting rid of the whole bump
> is important for minimizing the hassle of pasting with a stencil (any
> little bump can cause the alignment to be messed up). But it also makes
> the boards much more attractive.
> But folks, be sure to wear a good mask. I can only think of one thing
> worse than fiberglass dust getting into the lungs. The good shop masks
> with the "easy exhale" valves seem to work very well for me.
> -Pete
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