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  #31   Spotlight this post!  
Unread 03-15-2012, 11:52 PM
WarehouseCrew WarehouseCrew is offline
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Re: Team 16, Baxter Bomb Squad, 2012

Would you be willing to share your design for the winch, belt and release mechanism for your catapult?

Our mechanism (cam that grabs a bar attached to catapult) is not as effective as we thought it would be. Our original linear catapult was scrapped because of weight and consistency problems, so we are scrambling to get a traditional one working.
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Unread 03-16-2012, 01:42 AM
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Re: Team 16, Baxter Bomb Squad, 2012

Our original design was based on the Andymark dog shifter design. We bought all the parts individually and built the winch around that. We machined a pulley which rides on bearings and fastened the gear with the dog to it. this is driven by the dog which in turn is driven by a 26:50 gear drive from two window motors. In 2010 we used a fisher price driven dewalt transmission with locking pins. This year the window motor gearboxes are preventing backdriving.

Since the shifter was not designed to work with the load of surgical tubing we have, We had to use a much larger cylinder than the original design called for. This put a lot of stress on the pin holding the dog and it broke often. We fixed that by limiting the stroke so it never put full pressure on the pin.

The belt we use is standard Gates 9mm GT2. It has held up better than the cable we first used.

I don't have the inventor drawings but they exist. I can give you the part numbers for the shifter parts too if you need them. Our current design is totally fabricated here and includes some EDM work. It may be too difficult to pull off fast.
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Unread 03-16-2012, 07:52 AM
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Re: Team 16, Baxter Bomb Squad, 2012

Thanks for the information. We could not pull that off quickly. If you have the drawings, it might be nice to have that for a future robot.

I think we will stay with current mechanism and settle for the middle basket (not as much stress on existing mechanism).
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