RE: [CAD_CAM_EDM_DRO] Simple DRO new idea

hi
u can find ring magnet in back of audio speaker.


shabbir

At 02:26 PM 9/2/01 -0600, you wrote:

>Scott
>I am working on a very simple dro using a special purpose Hall effect sensor
>and a simple up down counter connected to a 8 digit led. It would work as
>follows
>a linear magnet strip or a ring magnet with alternating north and south
>magnet passes in
>front of the Hall effect sensor. This generates a pulse train to the counter
>circuit.
>The sensor as has a direction output that is updated first before the pulse
>so no lost steps.
>By using a timing belt and gearing the rotary motion of the ball screw or
>lead screw can be
>multiplied or divided based on the number of pulses of the ring magnet to
>equal an accurate count.
>I will be sharing what I find with the group as soon as I finish a
>proto-type. I am currently looking for a ring magnet if anyone may know
>where to find any or have some let me know.
>Derek B.
>
>
>-----Original Message-----
>From: Scott Riddle [mailto:sariddle@...]
>Sent: Sunday, September 02, 2001 9:40 AM
>To: CAD_CAM_EDM_DRO@yahoogroups.com
>Subject: [CAD_CAM_EDM_DRO] Simple DRO
>
>
>I just thought of this last night and I am sure some one else has to or it
>is already out there but I would like to put a cheap DRO on my Index Milling
>Machine and don't want to spend $600-1200 to do it. What I was thinking of
>was a simple rotary encoder with a shaft of a special diameter and to use a
>wire that is anchored on one end of the movable part of the slide it would
>then be strung along the slide wrapped once around the shaft of the rotary
>encoder and continue along the slide and the anchor at the other end with a
>spring to keep good tension on the wire. The rotary encoder would be
>anchored to the stationary part of the slide assy. When the movable part of
>the slide moves the wire would roll around the encoder shaft and translate
>linear motion into rotary. A encoder with quadrature with 4,000 counts per
>rev and a shaft dia of .63662" would give 0.0005 linear travel per encoder
>step. There would be a little work coming up with a small LCD screen and a
>few buttons and a basic stamp program and controller to run it all.
>
>What do you guys think? Are there some other simple cheap DRO options?
>
>Thanks
>Scott
>
>Scott Riddle
>sariddle@...
>
>
>
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