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| philf:
--- Quote from: NormanV on July 20, 2014, 03:47:20 PM ---The transducer does not see the hole even when it is just 1mm from the pulley. --- End quote --- Norman, Try the sensor further away. The sensing area is usually a Gothic arch shape as wide as the sensor diameter at the face of the sensor to a point at some distance from the face. As you move the sensor further away (but still within the sensing range) you might be able to sense the hole. The sensing distance varies greatly with material with iron being approx 3 times better than aluminium. Phil. |
| awemawson:
The eBay advert says the sensing distance is 4 mm. Quite tempting at that price to fit one to the Bridgeport, but with your experiences Norman I think I'd put a different proximity sensor on it. |
| NormanV:
Joy oh joy! I tried again with the sensor reading the hole but with the sensor further away. This time I got readings throughout the speed range that agreed with the theoretical speeds of what the motor should achieve and the speed ratios of my pulleys. The readings I got are certainly accurate enough for my purposes. Also, I have found a S/H compound table at a price that I can afford. I had previously bid on a milling machine table and slides (that would have required a lot of work) but was outbid. The compound table should only require tidying up and then I should be ready to start cutting metal!!!!! If it all works out I have to start thinking about what I am going to make with my milling machine. This all sounds a bit premature, let's get this machine working properly first. |
| awemawson:
Hoo - blooming - ray :thumbup: Norman, you'll be amused to hear I ordered one last night just to play with it - probably end up on the Bridgeport :ddb: |
| philf:
--- Quote from: NormanV on July 21, 2014, 03:25:25 PM ---Joy oh joy! I tried again with the sensor reading the hole but with the sensor further away. --- End quote --- Norman, I'm pleased it worked for you. It must look a lot better as well. :beer: Phil. |
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