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-   -   RS775 Gearboxes (http://www.chiefdelphi.com/forums/showthread.php?t=89325)

Vikesrock 10-02-2011 08:18
Re: RS775 Gearboxes
 
Quote:
Originally Posted by pfreivald (Post 1019018)
256:1, I believe. You can remove the last stage to speed it up, though I don't remember exactly what that does to the gear ratio.
I believe the FP gearboxes from the last couple kits have been in the range of ~122:1 to 128:1.

thefro526 10-02-2011 08:40
Re: RS775 Gearboxes
 
Just to follow up, we received our P60's Friday afternoon and were finally able to get them running with our Mechanism last night. I'm extremely happy with the build quality of the Newer Banebot Transmissions (They've come a LONG way since 2007) and they seem to be holding up really well. My only issue is that the Keyway in the output shaft of the P60 seems to be decently undersized - which is easily worked around.

I'm also throughly impressed with the RS775-18 Motors. We put the two on our mechanism into stall and near stall conditions for 10-15 seconds on end last night with no ill effects to the motors. They did build up some heat, but not enough that they couldn't pass the hand test.

Aren Siekmeier 13-02-2011 03:55
Re: RS775 Gearboxes
 
While this pertains to 550s and not 775s, I still think its worth noting as the two motors are fairly similar in a few respects (mostly power). Andymark recently (not sure how recently, I gave on this being an option a while ago) posted an updated version of their "Double Doozy" gearbox at http://www.andymark.com/ProductDetai...ctCode=am-0576 that you can buy without motors. It will apparently work with 550s and FPs (although the latter are illegal in quantity 2).

I find this particularly interesting because it would allow us to very easily hook up two 550s to our elevator on a low reduction and still fit a pretty small pulley. AND Andymark is now shipping SAME DAY (take that Banebots) on weekdays, and we happen to already have two 550s lying around :) ... (if the ERRORs don't mind...)

WOOOOOT!!!!!!
I don't know, I'm just really excited, even though our FP into a 16:1 is working alrightish.

JamesCH95 13-02-2011 07:47
Re: RS775 Gearboxes
 
Quote:
Originally Posted by R3P0 (Post 1018347)
We put a banebot motor (500 series not the 775) in a dewalt trans, then used a 4 gear reduction to get 400:1 for the arm.

( now if only I could drill horizontally and level)
We've been running a 775 in a 1/2" dewalt transmission for a few days now, works great. Depending on the application you may want to remove the anti-back drive pins.

Quote:
Originally Posted by thefro526 (Post 1019809)
Just to follow up, we received our P60's Friday afternoon and were finally able to get them running with our Mechanism last night. I'm extremely happy with the build quality of the Newer Banebot Transmissions (They've come a LONG way since 2007) and they seem to be holding up really well. My only issue is that the Keyway in the output shaft of the P60 seems to be decently undersized - which is easily worked around.

I'm also throughly impressed with the RS775-18 Motors. We put the two on our mechanism into stall and near stall conditions for 10-15 seconds on end last night with no ill effects to the motors. They did build up some heat, but not enough that they couldn't pass the hand test.
We've noticed the same things. Two thumbs up to the new P60s and the RS775-18, shipping times aside they are absolutely fantastic.

Ether 13-02-2011 10:35
Re: RS775 Gearboxes
 
1 Attachment(s)
Quote:
Originally Posted by Travis Hoffman (Post 1018406)
http://www.robotpower.com/catalog/

Scroll down...

Note I didn't order this or check and see if it really was in stock, as the site indicates.
2/13/2011: Out of stock until 4/15/2011.

See screenshot.

sanddrag 17-02-2011 17:02
Re: RS775 Gearboxes
 
696 is using 3 BaneBots P60's, and I must say, so far they are working flawlessly. We have a 550 in a 64:1, a 550 in a 26:1, and a 775 in a 256:1, that is geared another 5:1 to an arm. I estimate the 256:1 sees about 12 lb-ft max at the gearbox, and it works great so far. I'm very pleased with them so far. Let's hope they last.

The only annoyance is the screws that came with them that hold the two ends to the body are junk in my opinion. Also, they only engage about 2 threads. They need to be longer, and preferably hex drive. Anyhow, doesn't seem to affect it at all, so long as you have it all properly mounted.

Swampdude 17-02-2011 20:17
Re: RS775 Gearboxes
 
Quote:
Originally Posted by sanddrag (Post 1025318)
696 is using 3 BaneBots P60's, and I must say, so far they are working flawlessly. We have a 550 in a 64:1, a 550 in a 26:1, and a 775 in a 256:1, that is geared another 5:1 to an arm. I estimate the 256:1 sees about 12 lb-ft max at the gearbox, and it works great so far. I'm very pleased with them so far. Let's hope they last.

The only annoyance is the screws that came with them that hold the two ends to the body are junk in my opinion. Also, they only engage about 2 threads. They need to be longer, and preferably hex drive. Anyhow, doesn't seem to affect it at all, so long as you have it all properly mounted.
Our BB P60's 256:1 are going in the garbage. We ran them hard (used on the arm) for a day (maybe 60-80 tube scores) and by the end the body rotated and spring pins bent out. Did a fix on them and ran them again for a bit and the end of the shaft sheared off. Our arm weighs about 4 lbs. but the shock loads that happen during rough fast scoring are too much for those things. Had to go with the trusty andymark toughboxes.

sanddrag 17-02-2011 22:14
Re: RS775 Gearboxes
 
Quote:
Originally Posted by Swampdude (Post 1025472)
Our BB P60's 256:1 are going in the garbage. We ran them hard (used on the arm) for a day (maybe 60-80 tube scores) and by the end the body rotated and spring pins bent out. Did a fix on them and ran them again for a bit and the end of the shaft sheared off. Our arm weighs about 4 lbs. but the shock loads that happen during rough fast scoring are too much for those things. Had to go with the trusty andymark toughboxes.
Interesting. I did about 20 runs with a 14 lb arm. Would you happen to have a picture of your setup? Was the shaft supported on the end?

thefro526 18-02-2011 08:18
Re: RS775 Gearboxes
 
Quote:
Originally Posted by sanddrag (Post 1025318)
The only annoyance is the screws that came with them that hold the two ends to the body are junk in my opinion. Also, they only engage about 2 threads. They need to be longer, and preferably hex drive. Anyhow, doesn't seem to affect it at all, so long as you have it all properly mounted.
Sanddrag, I recommended swapping out the screws to longer, stainless steel 6-32 screws. I found that of our two transmissions on our robot, the one with the longer stainless screws held up much better than the one with shorter screws even know they were mounted on the same arm, 180* across from one another.

It seems that under the right loading, the shorter screws can stretch, allowing the gearbox to misalign. We used Mcmaster-Carr P/N 92196A164 and cut them to length for our application.

Ether 18-02-2011 08:50
Re: RS775 Gearboxes
 
Quote:
Originally Posted by Swampdude (Post 1025472)
Our BB P60's 256:1 are going in the garbage. We ran them hard (used on the arm) for a day (maybe 60-80 tube scores) and by the end the body rotated and spring pins bent out. Did a fix on them and ran them again for a bit and the end of the shaft sheared off. Our arm weighs about 4 lbs. but the shock loads that happen during rough fast scoring are too much for those things. Had to go with the trusty andymark toughboxes.
You swapped out a 256:1 gearbox for a 12.75:1 ?



Swampdude 20-02-2011 01:01
Re: RS775 Gearboxes
 
Quote:
Originally Posted by Ether (Post 1025793)
You swapped out a 256:1 gearbox for a 12.75:1 ?

yep, but also switched to cim and 5:1 sprocket reduction.

Travis Hoffman 20-02-2011 06:58
Re: RS775 Gearboxes
 
I know of a team that put two 5:1 stages into a 256:1 P60, along with a steel ring gear. 400:1 total reduction to a 6:1 sprocket reduction. Has yet to explode! I'm keeping my distance for a while. :-)

JamesCH95 20-02-2011 07:58
Re: RS775 Gearboxes
 
Our arm has been running with a 775 in a 64:1 p60 and another 775 in a dewalt, with an extra 6:1 sprocket reduction, worked great for a solid week of testing and our week 0 practice competition. Even stalling the 775s to hold arm position has been easy, barely heats up the motors.

Vince lau 02-03-2011 22:04
Re: RS775 Gearboxes
 
Is any team besides ours 3396 still waiting to receive their order?


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