904 mainshafts, Anyone interested in repros? |
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904 mainshafts, Anyone interested in repros? |
Dr Evil |
Dec 3 2009, 08:41 PM
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#1
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Send me your transmission! Group: Members Posts: 23,032 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
I am checking interest in repro 904 main shafts. I think I can get them either made or made out of 901 shafts for much less than the $1800-2000 that they are commanding now.
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davep |
Dec 8 2009, 03:36 PM
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#2
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914 Historian Group: Benefactors Posts: 5,195 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada |
I recall some posts on Pelican written by Grady Clay saying that the 904 2nd gear ratios on a 904 shaft were a little weak, and he preferred machining and welding like Chris does. I have an A mainshaft that I was looking to have modified, and may find a few more.
Would welding be cheaper than splining? |
ChrisFoley |
Dec 8 2009, 07:28 PM
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#3
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I am Tangerine Racing Group: Members Posts: 7,958 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
Would welding be cheaper than splining? Welding is cheaper than splining, however... In my opinion, simply welding the gear in place isn't adequate to resist the applied torque with the ratios used in this gear position. I create 4 of the 8 splines on the shafts I weld a gear on. In order to make the gear removable four more splines need to be built up and ground, as well as machining of the shoulder that the gear presses against. All the spline grinding is done by hand. I may have underestimated a little at $400 but I don't think its far off. Welding a gear is about $300. I'm still not 100% on the way the gear will be held in place. The intermediate plate bearing outer race will be taking the loads in one direction and its OD doesn't overlap the 3rd gear spline by much. If I was doing this with 904 2nd gears it would be no problem since, as the Dr mentioned, the splines are smaller in diameter. I would need a gear in hand to do it this way though. |
r_towle |
Dec 8 2009, 08:02 PM
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#4
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Custom Member Group: Members Posts: 24,624 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
Would welding be cheaper than splining? Welding is cheaper than splining, however... In my opinion, simply welding the gear in place isn't adequate to resist the applied torque with the ratios used in this gear position. I create 4 of the 8 splines on the shafts I weld a gear on. In order to make the gear removable four more splines need to be built up and ground, as well as machining of the shoulder that the gear presses against. All the spline grinding is done by hand. I may have underestimated a little at $400 but I don't think its far off. Welding a gear is about $300. I'm still not 100% on the way the gear will be held in place. The intermediate plate bearing outer race will be taking the loads in one direction and its OD doesn't overlap the 3rd gear spline by much. If I was doing this with 904 2nd gears it would be no problem since, as the Dr mentioned, the splines are smaller in diameter. I would need a gear in hand to do it this way though. Chris, I know the senior manager at Insco in Groton MA. A good friend. I would be happy to put you in touch. They have the equipment to do the shafts and gears....thats all they do. Rich |
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