Re: [CAD_CAM_EDM_DRO] Re: Opinions on $250 cnc machine

turbulatordude wrote:

>>For engraving it may not be an issue but engraving away the copper on a
>>circuit board and/or drilling holes, the tolerances on the leadscrew
>>
>>
>might
>
>
>>well cause misplaced pads or holes.
>>
>>
>
>For PCB work, even really poor threads would work. a 40 pin DIP will
>have that 2 inch long row all close enough to fit. There are very few
>things that have to have accurate coordinates, 99.99% is relative to
>something that is close. all caps and resistors are unimportant.
>
>

I've made boards at home that had to fit some chips with 0.5 mm lead
pitch. That takes a bit more precision. I did it with photolithography
processes, using my home-made laser photoplotter. Nowadays, a 40-pin
dip is a rare part to use.

My photoplotter is certainly a KISS-principle design. See
http://jelinux.pico-systems.com/photoplot.html

Jon