Homebrew PCBs

On 1/22/06, Adam Seychell <a_seychell@...> wrote:

> Regarding film mounting, it is ideal to have the film placed on the
> inside of a drum cylinder.

Maybe - there might be a problem at the edges of the film (that are
parallel to the axis of the cylinder), where the film might become
flat and not press against the inside of the cylinder.  Also, might
have to tape the film inside, to avoid it sliding around.

> The drawback with this approach is building
> single sided bearing mount system for the drum. I guess thats all up to
> degree of mechanical balancing.

Could have a conical plug that goes in one end of the cylinder.  The
plug would have a bearing, and the plug/bearing assembly could be
mounted with a hinge to the baseplate.  That allows the plug to be
removed from the cylinder so you can get at the inside of the
cylinder.  But that doesn't sound like it is worth the trouble.

For good, cheap small ball bearings, check out the bearings for rollerblades.

Cheers,
- Jan