RS775 Gearboxes

[pfreivald]

Why, in the age of quadrature encoders and with targets at a set height, would you be subjecting your lifting arm to human control (beyond 'this is the height I want)?

[JVN]

Originally Posted by pfreivald

Why, in the age of quadrature encoders and with targets at a set height, would you be subjecting your lifting arm to human control (beyond 'this is the height I want)?

Why subject your robot to a potential sensor failure when you can train a monkey (or a student, if monkeys are lacking) to put the tube at the right height every time?

[theprgramerdude]

Originally Posted by JVN

Why subject your robot to a potential sensor failure when you can train a monkey (or a student, if monkeys are lacking) to put the tube at the right height every time?

Humans fail far more often than sensors. Plus, humans react on the order of a few thousand times greater than a sensor.

[thefro526]

Originally Posted by Brandon Holley

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]

Originally Posted by thefro526

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]

Originally Posted by Brandon Holley

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.

Originally Posted by Chris is me

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]

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]

Originally Posted by noa_n_f

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:

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]

Hi, thanks for the reply. I just noticed that myself.

[sanddrag]

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]

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]

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...

[sanddrag]

Originally Posted by Manoel

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?

[Ian Curtis]

Originally Posted by sanddrag

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]

Originally Posted by iCurtis

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?