Harvey,
Pantographs and lasers are all existing technologies. My hobby is to invent
new things, especially things that are simple. So if I could apply some
homemade mixture to the cylinder, do a contact print, and then etch, I would
be happy.
Rick
-----Original Message-----
From:
Homebrew_PCBs@yahoogroups.com [mailto:
Homebrew_PCBs@yahoogroups.com]
On Behalf Of Harvey White
Sent: Thursday, March 21, 2013 1:29 PM
To:
Homebrew_PCBs@yahoogroups.comSubject: Re: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a
graduated dial
On Thu, 21 Mar 2013 11:18:29 -0700, you wrote:
>Andrew,
>
>I know that photo etching has been done on flat plates so assumed it
>could be made to work on a cylinder. I would wrap the artwork around
>the cylinder and rotate it at a constant rate under the UV light. The
>missing link here for me is an easy to apply photo resist. I've always
>used pre-treated circuit board material and had good results.
>
>One option I may pursue would be to coat the cylinder with wax and then
>use engraving techniques to scribe through only the wax. In this way,
>mistakes can be fixed by reflowing the wax. Not sure how to do the
>numbers. This method probably would work but is too much effort for me.
>If a spray-on photo resist could be made to work, that would be the key.
Try a pantograph and larger patterns to engrave the numbers. Another option
would be Laser engraving. You need to rotate the cylinder and move
perpendicularly to the axis. Same thing for normal engraving.
Might be worth the effort.
Harvey