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Unread 22-01-2007, 19:09
jfelser jfelser is offline
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Re: pic: Team 948 Shifting Transmission Version #2

Quote:
Originally Posted by David Guzman View Post
Looks nice,

Are those spacers next to the gears? or the hubs of the gears. If is the hubs I would suggest putting some spacer in between the two gears to reduce friction since they will spin at different ratios.

Just my $0.02
David G.
Those are 1/16 in spacers.

For the gears, we ordered standard gears from smallparts.com - GSS 1435 and GSS 1460 are the part #s.
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Unread 24-01-2007, 20:09
jfelser jfelser is offline
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Re: pic: Team 948 Shifting Transmission Version #2

*bump*

Does anyone have thoughts on using a servo to drive this, without modifying the center spool to include a spring?
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2004 Canadian SUPER Regional Winners with 33 & 1112, GM Industrial Design Award
2005 Finger Lakes Regional Winners with 191 & 494, Canadian Regional GM Industrial Design Award


Newport Robotics Group Team 948 | www.nrg948.org
2006 Portland Regional Motorola Quality Award Winners
2007 Portland Regional Finalists with 1540 & 1778, GM Industrial Design Award


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Unread 25-01-2007, 08:57
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Re: pic: Team 948 Shifting Transmission Version #2

Quote:
Originally Posted by jfelser View Post
*bump*

Does anyone have thoughts on using a servo to drive this, without modifying the center spool to include a spring?
I pitty the little servo about to die. All joking aside, I think you might run into problems if there is no spring in the system. Remember for a short period of time every time you shift, there will be binding while you're waiting for the balls to line up with the slots in the gear. These transmissions are more friendly than others towards their shifting actuator, but I would seriously suggest having some spring in there. The plunger shaft doesn't have to have springs on it as long as the device actuating the plunger has some sort of shock absortion either in the unit or the connecting linkages.
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Unread 25-01-2007, 09:23
jfelser jfelser is offline
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Re: pic: Team 948 Shifting Transmission Version #2

Yeah, after thinking about it for awhile this makes a lot of sense... mainly we are trying to get rid of the pneumatics weight - but, according to my calculations, we should be able to get 28 shifts each on 2 gearboxes before we run one tank down from 120 psi to 40 psi, so we may run our bot without a compressor onboard which would make this work.
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Code Red Robotics Team 639 | www.team639.org
2004 Canadian SUPER Regional Winners with 33 & 1112, GM Industrial Design Award
2005 Finger Lakes Regional Winners with 191 & 494, Canadian Regional GM Industrial Design Award


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2006 Portland Regional Motorola Quality Award Winners
2007 Portland Regional Finalists with 1540 & 1778, GM Industrial Design Award


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