Gene Heskett pravi: > On Wednesday 17 March 2010, Slavko Kocjancic wrote: > >> 2010/3/17 Gene Heskett <gene.hesk...@gmail.com> >> >> >>> On Wednesday 17 March 2010, Slavko Kocjancic wrote: >>> >>>> Frank Tkalcevic pravi: >>>> >>>>>> I see that a commercial "Z axis preset gauge" is A$275 down >>>>>> here, so a DIY alternative is attractive. (And it's >>>>>> advertised with "LED lamp", but no mention of an electrical >>>>>> output socket, so maybe no use, anyway.) >>>>>> >>>>> I have one of those >>>>> (https://www.machineryhouse.com.au/Products?stockCode=M691) - it has a >>>>> spring loaded plate, an LED and a 3v button cell battery. Complete >>>>> the circuit and the LED lights. I removed the button, drilled a hole >>>>> in the side, and added a cable to make it a touch off probe (initially >>>>> I used >>>>> >>> it >>> >>> >>>>> with my manual mill and DRO for touch off - exactly 50mm high). The >>>>> top of the plate is all scuffed up from raming a tool into it - twice >>>>> while developing touch off software, and once by jogging into it a bit >>>>> too fast. I need to have it reground. >>>>> >>>> Wau $275 for 3 switches one batery and LED? >>>> >>>> just see *http://tinyurl.com/yhcslo4* >>>> >>> And that is even better. Use metal screws set into HDPE, but I believe >>> I'd put a spot of some hard, wear resistant material in the middle of the >>> pcb for >>> the actual touch point. Something that won't scratch near as fast as the >>> pcb >>> material. >>> >> Probably some cap in shape of mushroom. Better material and cap to keep >> swarf out. >> > > And that sounds like a good idea too. But it needs a flat top, just in case > you miss the exact xy spot. :-) > > That's not a problem. When I go to the woods to collect some mushrooms I don't see it just until I put my foot over it. So mushrooms I pick have nearly all flat top :D
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