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-   -   pic: Team 948 Shifting Transmission Version #2 (http://www.chiefdelphi.com/forums/showthread.php?t=52481)

jfelser 21-01-2007 22:52

pic: Team 948 Shifting Transmission Version #2
 

Cpt_Dave_Lister 21-01-2007 22:53

Re: pic: Team 948 Shifting Transmission Version #2
 
Very nice, have you guys built it yet? =)

jfelser 21-01-2007 22:55

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.

Gabe 22-01-2007 01:20

Re: pic: Team 948 Shifting Transmission Version #2
 
Quote:

Originally Posted by jfelser (Post 562253)
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.

Out or curiosity, did you order gear stock for the gears? And of you did, from where? (See my signature)

David Guzman 22-01-2007 01:23

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.

camtunkpa 22-01-2007 08:37

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.

David Guzman 22-01-2007 09:31

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.

camtunkpa 22-01-2007 10:55

Re: pic: Team 948 Shifting Transmission Version #2
 
Quote:

Originally Posted by David Guzman (Post 562408)
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.

We have always hardened both the output gears and shaft for two main reasons. Hardening both parts means no wear on parts and also reduces the chances of galling. The gears definately will need to be hardened if you plan on shifting under a full load condition. Testing before hardening the slots in the gears that the ball bearing pops into has shown a slight wear pattern. This wear pattern maybe due to just run in and not get any worse during the season however our team likes to have a nearly maintenance free transmission. I know teams who used a ball shifter that did not harden the output shaft or the gears and they had no problems, but we'd rather not have an extra part to keep track of on our machine. Build it simple and fool proof. :cool:

David Guzman 22-01-2007 12:19

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

camtunkpa 22-01-2007 12:48

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.

lukevanoort 22-01-2007 13:31

Re: pic: Team 948 Shifting Transmission Version #2
 
Quote:

Originally Posted by camtunkpa (Post 562523)
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.

Dave Lavery made two very informative posts about hardening stuff here and here.

team222badbrad 22-01-2007 14:33

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!

EricH 22-01-2007 16:43

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.

jfelser 22-01-2007 19:09

Re: pic: Team 948 Shifting Transmission Version #2
 
Quote:

Originally Posted by David Guzman (Post 562329)
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.

jfelser 24-01-2007 20:09

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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