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| A Low Profile CNC Tool Height Setter. |
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| Lew_Merrick_PE:
--- Quote from: Tweakie on June 18, 2012, 08:49:59 AM --- --- Quote ---How repeatable are microswitches? I'm guessing they must be reasonably repeatable as my machine uses them as both limit switches, and reference marks, when setting itself up. It had occurred to me if they were good to, say, 0.01mm, they'd make an ideal tool height setter without having to worry about conductivity. --- End quote --- I suppose it all depends on the quality of the microswitch but it is certainly worth a try. --- End quote --- Several years ago I was doing some development work for a major software/hardware company. One of the areas involved qualifying SPST-NO and SPST-NC pushbutton switches for make point and break point repeatability. C&K Switches cheapest (about $4.50/gross at the time) pushbutton switches (with .080 inches/2 mm overtravel) had a repeatability of .002 inches/0.05 mm. Now, mind you, the actual make point or break point could vary by .025 inches/0.64 mm from switch to switch. Their (C&K's) mid-range priced SPST switches were slightly better (I would have to dig out my lab book from that period to come up with numbers) and their high-priced SPST switches were more rugged, but no more repeatable. Now, mind you, a small capacitor in parallel with the switch is needed to get this type of repeatability on almost any switch -- and many manufacturers build that into their switch unit. I was sadly disappointed by Cherry Switch's showing in these test -- and I grew up with Cherry being the gold standard of switches. |
| Tweakie:
The wiring between the over travel switch and the main PCB had made the probe difficult to assemble / disassemble so the case has been re-designed to include a small pocket to accommodate a slightly longer loop of wire. This seems to have overcome the problem - so far so good. The new case has been CNC machined, lightly sand blasted then hard anodized. Tweakie. |
| Brass_Machine:
Nice looking case Tweakie! |
| Tweakie:
--- Quote from: Brass_Machine on July 08, 2012, 11:11:48 AM ---Nice looking case Tweakie! --- End quote --- Thank you sir. There was bit of an anxious moment when I had accidentally selected mm/sec. instead of mm/min. for the feed rate on the tool change - fortunately, I just caught it in time. Tweakie. |
| Brass_Machine:
I bet! Are you going to be selling these? Or releasing it as kit or the files? Eric |
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