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4hv.org :: Forums :: General Science and Electronics
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Linear Motor + Optical Encoder - what to do with these I wonder...?
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thedatastream
Fri Aug 14 2009, 03:00PM Print
thedatastream Registered Member #505 Joined: Sun Nov 19 2006, 06:42PM
Location: Yorkshire!
Posts: 329
 		Donated from a colleague, ex mixing desk
Linear motor - lots of magnets inside shaft, coil on outside of shaft
Optical encoder strip at bottom

Any ideas for what to do with them? Something with lasers and an arduino perhaps...

James


1250261962 505 FT0 Img 3322

1250261981 505 FT0 Img 3323

1250262007 505 FT0 Img 3324
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klugesmith
Fri Aug 14 2009, 03:49PM
klugesmith Registered Member #2099 Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
 		You can use the optical encoder strip as a very coarse diffraction grating.
Shine a laser pointer through it and measure the (small) divergence between spots.
Then you can determine the encoder pitch from the laser wavelength, or vice-versa.
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lhl_henrylui
Fri Aug 14 2009, 04:32PM
lhl_henrylui Registered Member #1498 Joined: Thu May 22 2008, 07:08AM
Location: Hong Kong
Posts: 72
 		If you have two, then you can make a two axis CNC!!!
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aonomus
Fri Aug 14 2009, 05:26PM
aonomus Registered Member #1497 Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
 		I don't think those have enough force for a 2 axis CNC, although you could try something hackish and make a mechanical VU meter...
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tobias
Fri Aug 14 2009, 08:51PM
tobias Registered Member #1956 Joined: Wed Feb 04 2009, 01:22PM
Location: Jersey City
Posts: 172
 		Why not a 2 axis CNC with laser head as a engraving machine?
No force required! And you can even made PCBs with it... check this out:
Link2
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thedatastream
Sun Aug 16 2009, 06:50PM
thedatastream Registered Member #505 Joined: Sun Nov 19 2006, 06:42PM
Location: Yorkshire!
Posts: 329
 		Thanks for the ideas guys, I like the idea of a mechanical VU meter - especially if you attached an RGB LED to do the colours!

The encoder strip has the number 127 engraved on it so it could be 127 per inch. I guess the holding force would be similar to a stepper - easy to determine by hanging off a weight from the slider arm.

I think I'll hang on to them until I an think of a really good use for them
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Hazmatt_(The Underdog)
Sun Aug 16 2009, 11:52PM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
 		I would definately make some sort of positioner with them. Don't take them apart, they're more valuable intact. I think a micro mill would be really sweet!
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Steve Conner
Mon Aug 17 2009, 10:09AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		Looking at the pictures, the linear encoder seems pretty coarse. After all, you can see the holes in the strip! I don't think it would give enough resolution for CNC work.
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