Homebrew PCBs

To tell the truth I haven't measured it. If you look closely at bright 
mild steel the slight roughness tends to be pits in the surface rather 
than bumps. Skate bearings give a fairly large contact area so they ride 
over the pits. Quickly running over the surface with a sharpening stone 
(I use a diamond hone) will take off any high spots and dings from 
handling. Although BMS isn't that accurate dimensionally any given piece 
will not vary much over it's length.

Les

uhmgawa wrote:

>What type of tolerances are you able to hold with this
>approach?  At least with the mild steel of which I take
>delivery the surface really can't compare with ground
>drill rod.
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