Derward,
I investigated spin coating a bit further,
http://en.wikipedia.org/wiki/Spin_coatinghttp://www.clean.cise.columbia.edu/process/spintheory.pdf%20%20http://www.ece.gatech.edu/research/labs/vc/packaging/theory/spin_theory.htmlIt seems as though 1200 -4800 rpm is the approximate speed of rotation.
If you can do this at 45 rpm, This an almost ready made solution,
http://www.allelectronics.com/make-a-store/item/DCM-351/24-VDC-GEAR-MOTOR-W/-TURNTABLE/1.htmlHowever, my reading of the above references suggests that the thickness of the coating is proportional to the speed and viscosity. I may try the allelectronics motor, but I like the fan solution of designer_craig.
Here is another take on the fan approach,
http://www.chemistry-blog.com/2007/01/13/pimp-my-spin-coater/Quote from the answer to a comment question:
"I use velcro to hold the samples down. The pc fan is an Antec tricolor pc fan. It takes DC Power, we can vary it from 0-12V depending what speed is needed. The fan was able to spin from 0 rpm up to around 2500 rpm."
From the photo, It doesn't appear that he is even using a a platter.
Baxter
--- In Homebrew_PCBs@yahoogroups.com, "Derward Myrick" <wdmyrick@...> wrote:
>
>
> Back in the ealy 1960s I worked at a Company that used a record player turntable
> at 45 rpm. Worked great.
>
> Derward Myrick KD5WWI
>