Thread: control system programming
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Unread 23-06-2002, 22:14
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#0047 (ChiefDelphi)
  
Join Date: May 2001
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Re: Works for us...
Posted by Rick Berube.

Engineer on team #121, Rhode Warriors, from Middletown H.S..

Posted on 3/5/2000 4:33 PM MST


In Reply to: Re: Works for us... posted by Justin Stiltner on 3/4/2000 9:15 PM MST:



How about drilling a slot in your sprocket and using a servo to insert a pin. Spring load the pin so if it stikes the solid part of the sprocket, it will be a simple matter of turning the sprocket another turn or so (1/2, 1/4 turn depending upon how many slots you drill/cut) before the pin pops in. You'll need to drill/cut the slot(s) at radius along an arc to allow easy insertion of the pin (much like the main sprocket on a bicycle).
On either side of the sprocket, ensure the pin is up against an appropriate mechanical stop when the sprocket comes to rest on it. You'll need to make sure the servo is not the object handling the load and that the pin and stops are rugged enough to handle the load on them! I am also assuming that in your design you can afford a turn of your mechanism w/o it slipping too much, and that the sprocket will be slipping relatively slowly compared to the servos ability to insert the pin as teh sprocket back-turns.

My first thought was to use the solenoid from a pneumatic valve, but I don't think you are allowed to dismantle one to use it. Also I don't know what the throw on it would be, or the diameter of the pin itself. Probably too small judging by the size of the valves.

Hope this helps,

Rick



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