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Unread 14-09-2009, 13:15
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paper: FRC1189 2009 Shooter Gearbox Development

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FRC1189 2009 Shooter Gearbox Development by kramarczyk
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Unread 14-09-2009, 13:20
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Re: paper: FRC1189 2009 Shooter Gearbox Development

Mark -
This is a fantastic resource and one that I think will really wake up alot of folks to the true versatility and usefulness of the FP motor and gearbox. I especially liked your honest description of the all-too-common-in-FRC last minute design constraints that played into your decisions. Plus, the narrative form really makes the paper fun to read!

Thanks for sharing!
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Unread 14-09-2009, 14:26
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Re: paper: FRC1189 2009 Shooter Gearbox Development

Thanks.

I've hemmed and hawed about posting this for most of the summer. I wanted to get the FP info out there since I don't know of any consolidated source. Some of it is spread through a variety of CD posts, but can be hard to find. I really wasn't sure if I should include the team oriented narritive, so I'm glad the dirtiness of the iteration played well.
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Unread 14-09-2009, 14:56
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Re: paper: FRC1189 2009 Shooter Gearbox Development

This is a fantastic resource, thanks.
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Unread 14-09-2009, 22:11
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Re: paper: FRC1189 2009 Shooter Gearbox Development

I know I told you this when I saw this several months ago, but this is a FANTASTIC paper.
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Unread 14-09-2009, 22:24
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Re: paper: FRC1189 2009 Shooter Gearbox Development

Was the ability to aim left/right ever used? How effective was varying the speeds?
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Unread 15-09-2009, 07:03
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Re: paper: FRC1189 2009 Shooter Gearbox Development

Quote:
Originally Posted by AdamHeard View Post
Was the ability to aim left/right ever used? How effective was varying the speeds?
Yes, it was used when pinning someone at the trailer hitch. The varying speeds did work with the camera, but the game ended up play faster that we thought and as a system (camera through to hardware) it wasn't fast enough to automatically track. Fortunately there are manual options for left,center, right at a contact distance (~3 ft). Did it work as well as I would have liked, no. Did it work, yes. As the balls broke, down the variation in game pieces caused problems.

http://www.thebluealliance.net/tbatv/match/2009gl_qm76
http://www.youtube.com/watch?v=DH8KL... F6C2B&index=0
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Last edited by kramarczyk : 15-09-2009 at 09:17. Reason: addl comment
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Unread 15-09-2009, 09:26
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Re: paper: FRC1189 2009 Shooter Gearbox Development

Great paper!
A must read for anyone wanting to learn more about utilizing FP motors.
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Unread 15-09-2009, 10:58
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Re: paper: FRC1189 2009 Shooter Gearbox Development

Great paper and thank you for your effort to pass useful info along. I would bet there will be some FP motors and gear boxes in this year's KOP.

One comment: As I recall the FP motor air intake is on the front face and the exhaust is at the rear where you can see the fan blades. Would it add to reliability and longevity to add some openings in the gear box to allow air intake to keep the armature a little colder? Cooler armature would result in cooler winding lowering the resistance with resulting possible increase in output power.

Keep up the good work. ... jon
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Unread 15-09-2009, 13:03
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Re: paper: FRC1189 2009 Shooter Gearbox Development

Has anyone ever machined a heat sink to fit over the FP motors' body? I would think that if you can get a snug metal-metal (or metal-thermal paste-metal) fit, you could probably cool the motor quite effectively by increasing the volume/surface area of heat dissipation and decreasing the effective power density.
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Unread 15-09-2009, 13:25
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Re: paper: FRC1189 2009 Shooter Gearbox Development

In 2008 we used part of a quadcore cpu heatsink that was round, and simply spread it wide enough to fit over the fp motor, worked quite well.

you can see it in the lower left of this pic

http://www.chiefdelphi.com/media/photos/31538
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Unread 15-09-2009, 13:36
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Re: paper: FRC1189 2009 Shooter Gearbox Development

Quote:
Originally Posted by Jared341 View Post
Has anyone ever machined a heat sink to fit over the FP motors' body? I would think that if you can get a snug metal-metal (or metal-thermal paste-metal) fit, you could probably cool the motor quite effectively by increasing the volume/surface area of heat dissipation and decreasing the effective power density.
I've heard this heat sink worked wonders on 1024's 2008 robot.
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