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=== dual layer PCB fixture & locating system === ''' Part 1 ''' work plate for prepared pcbs (i.e. has holes for locating) * make pin indexed work plate that attaches with t-nuts (no need to drill holes in the maxnc) * add large dowel pins for indexing PCBs with pre drilled holes. * release pockets to scoop under pcb ''' part 2 prep work-plate''' * something sacrificial with indexing corner, to drill holes in PCBs needed to locate in dowel pins above * Face mill both to get '''flat surface'''. This could make it really easy to get good dual sided pcbs. Process would be: # load prep pate, clamp down pcb in corner # home # run pre-written g-code # swap plates # home. # Place pcb in dowel pins, glue, mill side 1 # Flip pcb (release, reglue) # Mill side 2 # Remove, release CA glue with acetone ------------------------ UPDATE: 4/25/14 Machinist from 23b Shop checked out the mill. Settings have been tweaked, worlds have been reversed. X and Y axis flipped, .INI file adjusted to allow for a higher MAX_VELOCITY (15 IPM now, up from 6, not sure the original control hardware can do much more than that) Seems like the mill prefers to have all the XY coordinates in the positive quadrant in relation to the G54 origin. Simplified G code worked just fine Gibs on the Y axis need adjustment, no limit switches or end stops are installed at the moment, so use the mill with extreme caution. two sample programs exist in the nc_code folder, noise.txt and nyan.txt, both will run on a 3.5" tall, 4.5" wide piece of stock, with the origin at the front left corner. Use a 1/8" engraving bit. ------------------------ [[Category:Pages with a Noisebridge Tiny URL]]
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