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pic: Team 948 Shifting Transmission Version #2
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Re: pic: Team 948 Shifting Transmission Version #2
Very nice, have you guys built it yet? =)
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Re: pic: Team 948 Shifting Transmission Version #2
Working on it - the gears have been ordered at least. The whole gearbox casing (w/ the pneumatic mounting) is only 3 inches thick, the gearbox is around 8 lbs.
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Re: pic: Team 948 Shifting Transmission Version #2
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Re: pic: Team 948 Shifting Transmission Version #2
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. |
Re: pic: Team 948 Shifting Transmission Version #2
Looks good! Just remember to give yourself enough time to get the output shaft and gears heat treated.
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Re: pic: Team 948 Shifting Transmission Version #2
Why do you say they have to heat treat them. I dont think there is a need, not for FIRST uses. But then again I am not an engineer. Do you mind explaining.
Thanks David G. |
Re: pic: Team 948 Shifting Transmission Version #2
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Re: pic: Team 948 Shifting Transmission Version #2
I see, :rolleyes:
I designed a ball bearing shifter that is currently being tested but i did not take into a count hardening the gears. However :D I used 6 holes on the gears and 3 balls so there is not as much friction while shifting. But either way do you think you could describe the process for hardening the gears?:confused: I would appreciate it. Thanks, David Guzman |
Re: pic: Team 948 Shifting Transmission Version #2
David,
We have a local company harden the gears and shaft for us. I don't know much about the process :o Maybe someone with more mechanical knowledge could explain the process of case hardening. |
Re: pic: Team 948 Shifting Transmission Version #2
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Re: pic: Team 948 Shifting Transmission Version #2
One inch diameter A2 tool steel is what we make the shaft with. The shaft and gears were hardened to between 55 and 62 Rockwell C.
Whatever you do, just keep them lubricated as with any transmission! |
Re: pic: Team 948 Shifting Transmission Version #2
In 2003, we had a gearbox for our four-bar lift. We hit the bar across the field wrong two days before ship at a practice event and broke two teeth on one gear (non-treated). We exchanged it for a heat-treated gear and had no problems later.
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Re: pic: Team 948 Shifting Transmission Version #2
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For the gears, we ordered standard gears from smallparts.com - GSS 1435 and GSS 1460 are the part #s. |
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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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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