MadModder

Thanks for those vids Pekka.
That surface grinding one had popped up on my feed, but I had not watched it until now. It certainly gives me one potential option if I go down this line.

The belt one, I'm going to guess is aimed more at getting a brushed/clean finish rather than good tolerance.

And yes, industrial centreless grinders all seem to be big, but then they're all aimed at big throughput with minimal adjustment. If I was to go for grinding, I'd hope to have something reasonably compact, but I'm well aware the smaller the wheel, the more adjustment it'll need to keep tolerances.

Welcome aboard Rayfredo, you are not our only member in the vicinity of Paris.

( . . .cue Matthew  )

Maybe you are familiar with this?



Because grindingwhees can be hands full, mabybe belt would a way to go...something like this:


Real machines tend to be powerhungry behemonts, here is the tiny one:


Pekka

Sooo, after a few experiments, 3rd time lucky! (pic 1)

After etching... one track has undercut (pic 2). Oddly, the tracks that LOOK broken are fine, and one that looks fine isn't. I tried to fix it with some solder, but no joy.

Decided to drill it anyway (pic 3), silly me forgot to check the drill bit size and the holes are a little too large, but there looks to be enough pad left to solder to. Too late to start now, that's tomorrow's job. I'll bridge the broken track with a tiny bit of wire.

So, if the soldering goes well, then the jury will be back in! The provisional verdict so far is:

• The LEDs are now doing the job nicely
• The drilling machine works fine; it's a bit of a chore setting it up without any alignment marks, but I pretty much got there OK
• Cupric Chloride works just fine as an etchant. A bit slow, perhaps, but maybe I didn't make it strong enough, I'll try a new batch another day.
• Will it solder....

You shouldn't suffer chatter from a worn not or screw, chatter comes from worn or burred ways and mating faces. Fitting a new screw and nut often improves chatter merely because the closer fit adds rigidity to the assembly - it masks the problem but doesn't cure it. The down-side of course is that your new screw and nut wear faster.