gary wrote:It would be nice if a batch of very thin stainless steel disks of the right size for the MUTR could be ordered by the association and offered for sale.
I made this suggestion a couple of years ago, but it hasn't been taken up for some reason, when I come to the point of needing a disc this is how I intend to do it...
Using a single-sided fibreglass PCB cut to a circle and the holes drilled. Fibreglass shouldn't warp or bend and it's very flat and strong. It's available in thicknesses under the usual 1.6mm, less than 1mm I believe.
A PCB company can easily make this, no etching is required and it's all done on accurate CNC machines. To stop tarnishing of the copper a solder resist can be applied but the holes would need to be drilled after application or masked around the holes a small distance.
Alternatively no copper at all and spray it black.
I'm not sure about the costs which might put some off, but a batch of 10 or more hopefully shouldn't be that bad.
Just a suggestion...
Steve A.
Added later...It appears that 0.8mm is a standard thickness for PCSs.