pic: WCD off season chassis from 2471

[Ty Tremblay]

What lead you to choose to use tensioners with your design?

One of the major benefits of the in-tube design is that it's practically impossible for a chain to jump the sprocket, especially if the center-to-center distance between the sprockets is correct.

[Bryce2471]

Originally Posted by Ty Tremblay

What lead you to choose to use tensioners with your design?

I was not involved in that decision, so I can't say for sure. However, I do know that bearing blocks were used so that the the frame could use .0625in wall tubing.

[JesseK]

Do I spy shock absorbers? Or is that black ABS for spacing?

[RobotsThatWork]

for your chain in tube design, are you using 2"x1" tubing? if so, are you using COTS sprockets? I haven't been able to fit 2 COTS sprockets into the tube. It would be great if anyone could tell me how everything was packaged together.

[Greg Woelki]

Originally Posted by RobotsThatWork

for your chain in tube design, are you using 2"x1" tubing? if so, are you using COTS sprockets? I haven't been able to fit 2 COTS sprockets into the tube. It would be great if anyone could tell me how everything was packaged together.

I can't speak for team 2471, but these fit. A version broached for 1/2" hex is available in the drop down selection box.

[Bryce2471]

Originally Posted by JesseK

Do I spy shock absorbers? Or is that black ABS for spacing?

Yes, and yes. They are plastic spacers. We designed the bumper mounts that way to help insulate the frame from impact. This year's BunnyBots competition has no rule against high speed ramming, and looks to be highly violent.

Originally Posted by RobotsThatWork

for your chain in tube design, are you using 2"x1" tubing? if so, are you using COTS sprockets? I haven't been able to fit 2 COTS sprockets into the tube. It would be great if anyone could tell me how everything was packaged together.

It was designed to use standard vex spockets, but because they were out of stock, we ended up using steel sprockets with shortened hubs. I don't know the exact layout.

Originally Posted by Greg Woelki

I can't speak for team 2471, but these fit. A version broached for 1/2" hex is available in the drop down selection box.

Very nice, I was unaware that they were availible in hex.

[R.C.]

Originally Posted by RobotsThatWork

for your chain in tube design, are you using 2"x1" tubing? if so, are you using COTS sprockets? I haven't been able to fit 2 COTS sprockets into the tube. It would be great if anyone could tell me how everything was packaged together.

I'm not sure how cots sprocket don't fit? Do they not fit due to the diameter or the width of the sprocket or both?

[RobotsThatWork]

Originally Posted by R.C.

I'm not sure how cots sprocket don't fit? Do they not fit due to the diameter or the width of the sprocket or both?

Two 16 tooth vexpro sprockets do not sit next to each other inside the 2x1x1/8 (so width). This is true for both when bearings are press-fitted, and when I use a versa bearing block. The Sprocket with Chain attached to it has a total diameter of 0.491 inches. When I put 2 back to back it would be too wide to fit inside the boxtubing. Any solutions?

I haven't looked into the 17 tooth double sprocket, but can you create a dropcenter with the larger diameter? I know the clearance is pretty slim already for 16t, but I don't know for sure with 17t.

[pribusin]

Very nice and clean drive base. I want our team to look into a chain-in-tube design this year but I've always wondered how you assemble the chain and sprockets in the tube Care to give me some insight on the procedure? Are there access hole on the underside? Has anyone ever done this with belts?

[notmattlythgoe]

Originally Posted by pribusin

Very nice and clean drive base. I want our team to look into a chain-in-tube design this year but I've always wondered how you assemble the chain and sprockets in the tube Care to give me some insight on the procedure? Are there access hole on the underside? Has anyone ever done this with belts?

What we've done is loop the chains around the sprockets and then drop the entire thing down into the tube. Then slide the axles through the sprockets and the bearings over the axles. This is of course 100x easier if the tubes are not attached to the robot already.

If you are using 2 sprockets in the middle like we do we have a small piece of axle that we'll put through the two sprockets to hold them together during the drop and push that piece out with the final axle.

[pribusin]

Got it - thanks.

Are those 3" x 0.875" wheels? How are they kept from slipping off the hex shaft?

[jman4747]

Originally Posted by pribusin

Got it - thanks.

Are those 3" x 0.875" wheels? How are they kept from slipping off the hex shaft?

External retaining rings: http://www.mcmaster.com/#97633a200/=102dny4

[Nebster]

What are you using to hold the corners of the frame together? It's not clear to me

[notmattlythgoe]

Originally Posted by Nebster

What are you using to hold the corners of the frame together? It's not clear to me

There are blocks in the ladders with through bolts going through the rails.

[Ty Tremblay]

Originally Posted by Nebster

What are you using to hold the corners of the frame together? It's not clear to me

http://www.team221.com/order.php?cat=15

See "Chassis Tube Connector"