Gallery, Projects and General > Project Logs |
Building a milling machine |
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awemawson:
Try it on the lathe and report back |
philf:
Norman, I agree with Andrew. It's a proximity sensor and not a Hall effect sensor so no magnet is necessary - just a hole. The problem with 1 hole is that you may have balance problems. If your Tacho has a divide by 2 function 2 holes would be better. On my mill I did use a Hall Effect sensor and 1 magnet in an aluminium Poly V pulley. To balance it I glued a piece of same size stainless steel 180 degrees from the magnet. It quite happily runs at 10,000rpm. Phil. |
vtsteam:
Drill out the magnet, tap, replace with a grub screw about half the depth of the hole in length. You should be able to balance with the screw proud, which should also trigger the sensor. When both balanced and registering on the tach, Loctite it. Watch out for the magnet dust -- it isn't healthy stuff. ps. but first check the sensor on lathe per Andrew. |
NormanV:
I followed Steve's advice and the tachometer is now working. I've also completed the switch panel, I added some graphics to remind me which way to turn the knobs. I'm quite pleased with it. I've now got to save up to buy a compound table to finish it off. |
awemawson:
Glad it's now working :thumbup: But from a safety point of view I'm not keen on the protruding screw. Have you tried triggering off the hole that the screw occupies? It should work. |
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