possible shielding problem.

[jonjon]

I got an enclosure powder coated, great, but was only expecting them to powder coat the out side.
They did the whole thing, Do I just need to file the holes where The input and output holes are or do I have to remove more...
Sorry if this is a dumb question, but thanks to anyone who replies

[StereoKills]

I would sand the paint off around the inside of the input and output jack holes. No need to sand off anywhere else as no ground connection is needed to the chassis other than that.

[petemoore]

Do I just need to file the holes where The input and output holes are or do I have to remove more...
 may be hard to get file teeth applied to the substrate near the hole, inside the box.
 You've got the idea, and many say remove more, a dremel or drill with some cutting wheel comes to mine as a way to whiff paint dust off out of there.
 Verify with DMM, or just do 'more', enough that you're satisfied the phase of the moon or temps or...that you have a solid connection.
 another way is with a screw-tab ground, also hard to install in a thin-walled box you want perfect looking sides on.
 There's another way but it's still in the design stages, a strong strut of copper with teeth, a bone of copper with teeth at each end, pounded in one end at the top-corner, where the screws aluminum-meat is thick and the top's strength spans right next to where the teeth would cut [through the paint, into the metal] and try to blow the sides out [strut goes between columns in the corners], connected to Gnd. by a wire, slides in without circuit board or other removals, no drilling, in this case too.

[stefcuypers]

Why would you want to pull away the paint? Can't you use wire for grounding, sort of star grounding?
I always paint the inside of my boxes... looks neater and you don't have a bad contact if it touch's the chassis in smaller builds.
I could be wrong.

[MikeH]

Try this- Tighten down a jack before you sand/file anything.  Test for continuity between the sleeve of the jack and a bare spot on the enclosure (I'm guessing there are screw threads somewhere that arent coated?).  Usually just tightening a jack down will cut through powder coat.  You could use a serrated nut to be sure.

[jonjon]

Thanks for the replies guys. I only just put it back together, before I saw the last 3 posts. I did just use a small rounded file to take the paint off the inside of the jack holes. so you can't tell there is any missing paint now that it is together. No hum, so all is good.

Pic, coz everyone likes pics



I really need to get a drill press, drilling free hand is not the most accurate way about going about things