Re: [CAD_CAM_EDM_DRO] 2D printer-real parts

Annie and list.

I concurr re thickness - about 0.030" is the sensible limit even for double
sided etching.
One of the unsung problems of this process is the "Nanny State" - I quoted
and designed a system part on the assumption of using KPR (Kodak Photo
Resist) for the resist, using negatives derived from a laser printer
transparency, and then found that KPR and its developers were banned in
Australia several years ago as cancer producing. Most of the available
substitutes did not come within cooee of the KPR performance.

Jim Gregg.
At 02:44 PM 10/11/00 -0700, you wrote:

>Join the ModelersCAD list on egroups. They have this down to a fine routine.
>
>Among model RR'ers it's routine to see things like expanded metal created
>in 1:87 size. I'm working on a railroad station model, the real one has
>"security bars" on the windows. I'll make them by photoetch.
>
>I'll send it out to be etched, as the chemicals are messy and I'm no expert
>at the process, but it's a routine.
>
>Most common material is half hard shim brass, but nickel silver, phosphor

bronze,

> and stainless steel are very common too.
>
>0.050 is pushing your luck on thickness, I'd CNC that. But for 0.020 it'll

etch fine.

>The problem is that the parts tend to undercut as they get thicker.
>
>Annie