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

thefro526 19-01-2011 14:36
Re: RS775 Gearboxes
 
Quote:
Originally Posted by Brandon Holley (Post 1003388)
Pretty frustrating to say the least.

We weren't planning on using the banebots gearboxes, but we have the means to help ourselves out on that front. I feel for teams that will be relying on banebots to interface with their motors. Having to wait 2 entire weeks (10 buisness days) for your gearboxes to arrive could be devastating.

-Brando
Luckily, we placed our order early this morning, so I'm hoping we might beat the rush of teams that were waiting on the release of these gearboxes. It stinks that we don't really have the means to make something with a large enough reduction using a reasonable amount of space in house.

I'm planning on giving BB a call today when I get out of work, or a call tomorrow morning just to follow up on our Order and get a better estimation of the lead time. I'm really hoping that BB is saying "5-10 days" just to cover themselves should 200 orders be placed in one day. Guess it's just time to wait and pray.

Brandon Holley 19-01-2011 15:30
Re: RS775 Gearboxes
 
Quote:
Originally Posted by thefro526 (Post 1003584)
I'm planning on giving BB a call today when I get out of work, or a call tomorrow morning just to follow up on our Order and get a better estimation of the lead time. I'm really hoping that BB is saying "5-10 days" just to cover themselves should 200 orders be placed in one day. Guess it's just time to wait and pray.
Yeah hopefully they are doing that, however anyone can throw out lead times like that to cover themselves, but that's a place I will always be cautious about getting parts on time from. I will just take a "wait and see" outlook until I start hearing from teams on actual timing.

-Brando

thefro526 19-01-2011 15:59
Re: RS775 Gearboxes
 
Quote:
Originally Posted by Brandon Holley (Post 1003617)
Yeah hopefully they are doing that, however anyone can throw out lead times like that to cover themselves, but that's a place I will always be cautious about getting parts on time from. I will just take a "wait and see" outlook until I start hearing from teams on actual timing.

-Brando
I'll try and report back with whatever news I get as soon as I get it.

Quote:
Originally Posted by Chris is me (Post 1001901)
I was under the impression that the P60s were counterintuitively stronger than the P80s. If the P60s can output less than 85 ft-lbs of torque, they're pretty much completely useless to me.
Banebots has posted that the P60 transmissions aren't recommended to output more than 35-ft lbs of torque. Anyone who's looking at purchasing either the 64:1 or the 256:1 Transmission should be aware that it is theoretically possible to exceed this torque with an RS775 (I would assume 500 series motors as well, but I haven't run the numbers) at Full Stall so design accordingly...

noa_n_f 21-01-2011 01:34
Re: RS775 Gearboxes
 
Has anybody else noticed that the RS775 gearboxes will now be postponed until "mid February?"

This will obviously not work for most teams. What are the alternatives? The bane bots motors are practically useless without gearboxes.

thefro526 21-01-2011 01:50
Re: RS775 Gearboxes
 
Quote:
Originally Posted by noa_n_f (Post 1004806)
Has anybody else noticed that the RS775 gearboxes will now be postponed until "mid February?"
The 4:1. 16:1. 64:1, and 256:1 are available now. The Mid-February Date seems to pertain to Custom Ratios and Gearboxes.

According to BB's Site:

Quote:
Due to the current overwhelming demand for our stock gearboxes, we have been forced to postpone the offering of our custom gearboxes until mid February.

noa_n_f 21-01-2011 02:00
Re: RS775 Gearboxes
 
Hi, thanks for the reply. I just noticed that myself.

sanddrag 21-01-2011 02:30
Re: RS775 Gearboxes
 
696 put in an order for some P60s on Wednesday night. We'll see when they arrive.

Does anyone know what the first part to fail would be in the 4-stage P60? Is it worth upgrading to the steel ring gear, or would something else go first? I'm wondering if the steel ring gear would keep it alive a little beyond 35 ft-lbs.

I don't yet have any first-hand experience with these gearboxes.

Manoel 27-01-2011 13:32
Re: RS775 Gearboxes
 
To the teams that have been doing FIRST for a while: the drill gearboxes from 2000-2002 are a perfect fit for the RS775 motors - the mounting holes match exactly and you get to choose between a 20:1 or 64:1 reduction - you can even change gears, if you forget the pain it was to do that back in the day! ;)

The only modification needed is for the pinion: you either buy (remember PIC?), manufacture (EDM, most likely) or steal one. We went ungracious on the drill and took the 12 (?) teeth, 0.7 metric module pinion from an old one we had around. The drill motor shaft is 4 mm and the RS775' is 5 mm. The pinion is hardened, so we had to anneal it (real quick with a blow torch) in order to machine. May seem a lot of work, but it really took us about two hours from concept to fully-functioning product.

thefro526 27-01-2011 13:38
Re: RS775 Gearboxes
 
Has anyone received their 775-Series P60's yet? We have not, and I've been trying to Call Banebots but no one answers the phone...

AcesJames 27-01-2011 13:46
Re: RS775 Gearboxes
 
On the 10 day maximum lead time to ship the P60 they gave my team, today is the 10th day. We haven't heard anything from BB, and we were planning on using a P60 with the 775 for our lift.

At this point we're seeking other options with a FP instead. :/

thefro526 27-01-2011 13:50
Re: RS775 Gearboxes
 
Quote:
Originally Posted by AcesJames (Post 1009757)
On the 10 day maximum lead time to ship the P60 they gave my team, today is the 10th day. We haven't heard anything from BB, and we were planning on using a P60 with the 775 for our lift.

At this point we're seeking other options with a FP instead. :/
When was your order placed? Ours was placed 7am (MST-their time) on the 19th, so today would be the 7th/8th business day (Depends on if they're open Sat), so I'm expecting a shipment notification any day now.

AcesJames 27-01-2011 13:53
Re: RS775 Gearboxes
 
Quote:
Originally Posted by thefro526 (Post 1009759)
When was your order placed? Ours was placed 7am (MST-their time) on the 19th, so today would be the 7th/8th business day (Depends on if they're open Sat), so I'm expecting a shipment notification any day now.
We placed our order on the morning of the 14th I believe. That would be 10 business days ago. We haven't heard anything from BB as of yet.

EDIT: I'm thinking I may be wrong on the order date. I didn't place the order. Our lead mentor did, although in an email this morning he'd said our lead time was up.

Ian Curtis 27-01-2011 15:06
Re: RS775 Gearboxes
 
Quote:
Originally Posted by sanddrag (Post 1004828)
696 put in an order for some P60s on Wednesday night. We'll see when they arrive.

Does anyone know what the first part to fail would be in the 4-stage P60? Is it worth upgrading to the steel ring gear, or would something else go first? I'm wondering if the steel ring gear would keep it alive a little beyond 35 ft-lbs.

I don't yet have any first-hand experience with these gearboxes.
In 2008 a 256:1 BB Gearbox failed on us (which I believe was the 2nd generation, the P60 is the third). We unknowingly ran it for a couple of seconds after it failed, but when we took it apart we had stripped almost all of the ring gear teeth on the final stage.

sanddrag 27-01-2011 15:13
Re: RS775 Gearboxes
 
Quote:
Originally Posted by Manoel (Post 1009746)
To the teams that have been doing FIRST for a while: the drill gearboxes from 2000-2002 are a perfect fit for the RS775 motors - the mounting holes match exactly and you get to choose between a 20:1 or 64:1 reduction - you can even change gears, if you forget the pain it was to do that back in the day! ;)

The only modification needed is for the pinion: you either buy (remember PIC?), manufacture (EDM, most likely) or steal one. We went ungracious on the drill and took the 12 (?) teeth, 0.7 metric module pinion from an old one we had around. The drill motor shaft is 4 mm and the RS775' is 5 mm. The pinion is hardened, so we had to anneal it (real quick with a blow torch) in order to machine. May seem a lot of work, but it really took us about two hours from concept to fully-functioning product.
Oh man, what memories. That really takes me back. And yes, I do remember PIC-Design, the ONLY supplier for a matching gear, with some crazy lead time.

Anyway, great tip, although I'm not sure I'd trust those drill gearboxes in low gear. They tend to like to come apart.

On a similar note, anyone stick a 775 in a Dewalt gearbox yet?

sanddrag 27-01-2011 15:16
Re: RS775 Gearboxes
 
Quote:
Originally Posted by iCurtis (Post 1009806)
In 2008 a 256:1 BB Gearbox failed on us (which I believe was the 2nd generation, the P60 is the third). We unknowingly ran it for a couple of seconds after it failed, but when we took it apart we had stripped almost all of the ring gear teeth on the final stage.
Do you have a picture of the application/design, or at least some specifics of how it was used? Also, what metal was that ring gear?


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