Re: RS775 Gearboxes
 

Just got that email from BB.

Re: RS775 Gearboxes
 

Yes, it fits perfectly. I have yet to do serious load testing, but given that the dewalt can handle a CIM's torque, I think it'll do just fine with a 775.

Edit: it also tolerates the input of two FP motors with additional gearing down quite robustly.

Re: RS775 Gearboxes
 

So because the gearboxes are not a stock item available to all teams, does that mean they are illegal?

Re: RS775 Gearboxes
 

This is an interesting question. (I'm assuming you're referring to the Banebots Transmission - if not please ignore this.)

I believe that this would apply here:

The Gearboxes themselves, would fit the definition of a COTS item (definition omitted to keep the post length down) because they are a stock item and the current issue in question is the Processing and Shipping time for such parts. I believe the Shipping and Processing Time would fall under the definition of Vendor, Point C.

It seems that Banebots has been barraged with orders from various teams, thus adding to the longer lead times.

Then again, I'm not the Q&A but this is my interpretation.

Re: RS775 Gearboxes
 

They are legal. You can take the gearbox off of any off the shelf drill.

The banebots gearbox should be legal because you could have ordered it like all other teams.

Re: RS775 Gearboxes - alternative?
 

Banebots is now quoting "the longer end" of 10-15 business days lead time. Does anyone have suggestions for an alternative 256:1 (or similar) gearbox to interface with the RS-775? We just decided to order one yesterday, and can't afford to wait until ship day to see it for the first time.

Re: RS775 Gearboxes - alternative?
 

Dewalt transmission in low gear is 47:1, throw on a sprocket reduction of 5:1 or 6:1 and you'll be good to go, plus you'll have integrated anti-back drive.

Re: RS775 Gearboxes
 

Video

Yup. The lift that actuates as the robot drives around the corner was actuated in two parts. There is a stick (that you can clearly see) that pushed the four bar up about halfway, at which point the four bar itself was actuated by sprocket attached to the front right member of the four bar.

Both of these were actuated by 256:1 Banebots gearboxes. There was also some bungee cord that was used to alleviate some of the lifting from the gearboxes.

The BB that failed was the one that actuated the 2nd part of the lift. We were just doing our final tests on Thursday night when it stopped working. We heard some terrible grinding, removed the gearboxes and saw the failure. I don't believe we took any pictures of it (at any rate, I don't have them) but a large number of the teeth had failed and there were lots of former gear teeth that had been smashed into long fragments floating about in the grease.

Worth noting was that the output shaft was cantilevered, but the sprocket was as close as humanly possible to the gearbox. We installed another gearbox & added a bearing so it became simply supported, and we did not experience another failure (realistically around 100 actuations, which is in the neighborhood of the number on the one that failed).

I don't recall what the ring gear was made of, perhaps a search of CD might turn up something? I can't find much about the old motors on BaneBots site.

Re: RS775 Gearboxes
 

What other types of alternatives are there if the RS775's don't come in on time? I'm assuming most people are planning to use them to lift their arm, etc. Would two window motors be sufficient to lift a good sized single pivot arm?

Re: RS775 Gearboxes
 

the 550's through KOP FP gearboxes would be good!

Re: RS775 Gearboxes
 

I've always wanted to try to couple a motor to this thing http://www.harborfreight.com/torque-...ver-93645.html

However, when I played with it in the store, the input took a bit of torque to turn. Not sure if it was the type of grease inside, or poor quality leading to binding or what. Neat idea though.

Re: RS775 Gearboxes
 

How do you mate the FP pinion gear to the BB550 without the pinion gear slipping on the BB550 shaft? It's a press-fit onto the FP motors (even looks like there's axial scoring on the FP shaft and pinion gear), yet I can slide it onto the BB550 shafts with my fingers.

I've done my darndest to find the answer so we can order the appropriate gearboxes (or use our current AM-FP planetaries) with BB550's, yet we may also go down the BB775+Dewalt route.

Re: RS775 Gearboxes
 

You'd have to knurl the 550 shaft to press on the FP pinion I think.

I don't know why you'd want to do that given that the 2011 FP motor has a higher free speed and higher torque that the 550 and already has the pinion pressed onto it... :confused:

Edit: If memory serves the RS775 shaft would be big enough to drill out the FP pinion and use the RS775 in the FP gearbox, though drilling new mounting holes would be a PITB. Food for thought.

Re: RS775 Gearboxes
 

Got an e-mail from Banebots:

It appears that our P60's should ship sometime before or on Wednesday of next week.

I hope.

Re: RS775 Gearboxes
 

We're in the same boat... so very aggravating. I just hope their product is worth it.