Quote Originally Posted by BillTodd View Post
The scale is (I think) just a PCB in (another guess) a sinusoidal shape. A source of the scale 'tape' would be VERY useful; It could be just stuck to the side of a mill table, for instance, and be read by a close fitting head (no bulky scale of PITA fixings).
The scale isnt a tape but a thin PCB with a lattice comb finger arrangement where the spacing follows a sinusoid...or at least thats one type, there's a nyumber of variations on the theme. Its clear that the PCB is manufactured in long lengths, I'm guessing ~32" then chopped up to suit. The trick I suppose is creating a long accurate dimensionally stable PCB.