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| Micro DRO made from tyre tread depth gauge |
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| Pete.:
Maybe so, but plain aluminium won't have the proper pattern for the quadrature encoder to give an accurate result. |
| ksor:
--- Quote from: Pete. on August 25, 2011, 02:05:00 PM ---Maybe so, but plain aluminium won't have the proper pattern for the quadrature encoder to give an accurate result. --- End quote --- I see no pattern on the original slider - OK, maybe it's on the backside of the aluminum strip of the slider. |
| BillTodd:
--- Quote from: ksor on August 25, 2011, 02:10:15 PM --- --- Quote from: Pete. on August 25, 2011, 02:05:00 PM ---Maybe so, but plain aluminium won't have the proper pattern for the quadrature encoder to give an accurate result. --- End quote --- I see no pattern on the original slider - OK, maybe it's on the backside of the aluminum strip of the slider. --- End quote --- Curious :scratch: The typical digital vernier has a plastic cover over the patterned 'pcb' Is the aluminium strip actually aluminium or just aluminium coloured (like paint)? A typical read-head will see almost any change of capacitance as movement, so I'm no too surprised a plain metal strip will cause the digits to change, but I would be surprised if they have found a way to 'read' the surface capacitively in a similar way an optical mouse can with reflected light. Bill |
| Pete.:
--- Quote from: ksor on August 25, 2011, 02:10:15 PM --- --- Quote from: Pete. on August 25, 2011, 02:05:00 PM ---Maybe so, but plain aluminium won't have the proper pattern for the quadrature encoder to give an accurate result. --- End quote --- I see no pattern on the original slider - OK, maybe it's on the backside of the aluminum strip of the slider. --- End quote --- It's under the silver sticker. The pattern itself is a stick-on part too. |
| Corvus corax:
Yesterday I tried one on my mill. Since I wanted a bit more travel I left the spring out altogether. Just gravity allowing the probe to touch the head. Worked very well and it gave me the the full 25mm of length. |
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