With the AZ111 the solvents flashed off quite fast but you did have to bake the board for 15 minutes at I think 120 or 15O F to harden the resist. Dust wasn't a problem any more than it would be for dry film. One did have to watch the stringers that formed like cotton candy from the drying excess resist as it departed the spinning board.
Craig
--- In Homebrew_PCBs@yahoogroups.com, "David" <dgh2259@...> wrote:
>
> Craig,
> Seriously impressive method of applying photo resist, certainly food for thought!! Beats the laminator method hands down!! How do you dry the board after? [and keep dust off it!!]
> David
>
>
>
> --- In Homebrew_PCBs@yahoogroups.com, "designer_craig" <cs6061@> wrote:
> >
> >
> >
> > Wayne,
> > I used to spin all sorts of boards. Used Shipley AZ111 for the resist. This was a solvent based, I would pre wet the board then spinn off the excess. I have also tried the AQ3000 water borne resist and that works just as well, possibly a little better.
> >
> > Small boards are not a problem nore are double sided boards. As the boards get larger it becomes harder and harder to get them centered on the spin table. Also the slinging forces between the center and outer edge vary greatly as the board gets bigger. I think the largest board I did was 8" x 8" though I would bet I could have done 10 x 10. Rectangular boards are the hardest to do.
> >
> > My first spinner was built from some sort of fractional HP motor and and aluminum plate, mounted in a cardboard box -- you do have to trap the excess resist that gets thrown off or you will have a mess. My latest unit is a little nicer and built from an old computer fan and a wood framed box with a splatter shield.
> >
> > https://picasaweb.google.com/115378886522213655693/DYIPCBs
> > Second photo is a short movie
> >
> > Board is held on with double stickey tape.
> >
> > Craig
> >
> >
> > --- In Homebrew_PCBs@yahoogroups.com, "waynehcausey" <wayne.causey@> wrote:
> > >
> > > Any experience with spin coating small PCBs? Equipment, RPM, photoresist, etc.
> > >
> > > Wayne
> > >
> >
>