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 Because FIRST wants everyone to have a sense of accomplishment even if you didn't accomplish anything during the match. - Koko Ed [more] |
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This was designed by one of our alumni collegiate mentors, who got tired of me assigning him human winch duties for our prototype kicker.
Window motor with 3:1 gear reduction and Andy-Mark pneumatic dog clutch.
Two of our awesome local sponsors, Gilanyi Engineering and Manufacturing Services and Ajax TOCCO, contributed their CNC and waterjet services to this mechanism.
Now to test it on the robot and see if JVN's spreadsheet is telling the truth... :-)
Discussion
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02-13-2010 03:59 AM
Michael Corsetto
Re: pic: 48 Kicker Winch
Have you already confirmed a 3/4" bore cylinder will be able to disengage the dog gear? We tried a 3/4" bore on ours, and it wouldn't pull out. To be safe, we switched it out with a 2" bore, 1/2" stroke cylinder. Very slick gearbox, can't wait to see final pics of the bot!
02-13-2010 11:06 AM
Travis Hoffman
Re: pic: 48 Kicker Winch
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Originally Posted by Michael Corsetto
Have you already confirmed a 3/4" bore cylinder will be able to disengage the dog gear? We tried a 3/4" bore on ours, and it wouldn't pull out. To be safe, we switched it out with a 2" bore, 1/2" stroke cylinder. Very slick gearbox, can't wait to see final pics of the bot!
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How much of a load were you applying to your system?
02-13-2010 11:40 AM
Michael Corsetto
Re: pic: 48 Kicker Winch
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Originally Posted by Travis Hoffman
We'll find out today.
How much of a load were you applying to your system? |
02-13-2010 09:21 PM
A_Reed
Re: pic: 48 Kicker Winch
Darn, the first dry run didn't quite work. We are having issues with a set screw holding the drive gear on the shaft. As the gear rotates under load the set screw is digging into the inside wall of the spool. I am thinking of taking another note from AM on this one and using a star retainer over the shaft instead of the set screw.
We haven't set up the pneumatics yet to see if the pressure on the cylinder will pull the dog but using a screw driver to do the job we found the friction on the clutch to be quite extreme.
Tomorrow will hold our answers.
--A. Reed
~The Designer~
02-14-2010 06:13 PM
Josh Drake
Re: pic: 48 Kicker Winch
We're doing the window motor too. We don't do the 3:1 reduction, just direct drive. We were able to pull about 70 pounds with the motor, and do it quickly. We too had some trial and error on the pneumatics. We finally went with about a 6:1 lever arm to leave any doubt out of it shifting.
02-15-2010 06:58 AM
bmusser
Re: pic: 48 Kicker Winch
We had to go with a bigger cylinder and also go with a lever design to get mechanical advantage to disengage. There is too much force required to disengage with mounting the cylinder straight in line with the shaft.
02-15-2010 10:08 AM
Michael Corsetto
Re: pic: 48 Kicker Winch
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Originally Posted by bmusser
We had to go with a bigger cylinder and also go with a lever design to get mechanical advantage to disengage. There is too much force required to disengage with mounting the cylinder straight in line with the shaft.
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