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-   -   pic: WCD off season chassis from 2471 (http://www.chiefdelphi.com/forums/showthread.php?t=139926)

Bryce2471 01-12-2015 16:42

pic: WCD off season chassis from 2471
 

Harman341 01-12-2015 16:46

Re: pic: WCD off season chassis from 2471
 
I don't see any chain. Is that chain-in-tube or are you just powering the middle wheels?

KrazyCarl92 01-12-2015 16:47

Re: pic: WCD off season chassis from 2471
 
Are you going chain-in-tube to power the corner wheels?

Are the two vertical 2" x 1" tubing pieces on the left side (as pictured) corner wheels encoder mounts? Why do they stick up above the height of the frame?

Zebra_Fact_Man 01-12-2015 17:12

Re: pic: WCD off season chassis from 2471
 
Quote:

Originally Posted by Harman341 (Post 1509126)
I don't see any chain. Is that chain-in-tube or are you just powering the middle wheels?

Quote:

Originally Posted by KrazyCarl92 (Post 1509127)
Are you going chain-in-tube to power the corner wheels?

Is see the question I was going to post has already been asked...

OP please to tell.

Bryce2471 01-12-2015 17:25

Re: pic: WCD off season chassis from 2471
 
Quote:

Originally Posted by Harman341 (Post 1509126)
I don't see any chain. Is that chain-in-tube or are you just powering the middle wheels?

It's a chain in tube design
Quote:

Originally Posted by KrazyCarl92 (Post 1509127)
Are the two vertical 2" x 1" tubing pieces on the left side (as pictured) corner wheels encoder mounts? Why do they stick up above the height of the frame?

They are encoder mounts. They stick up to accommodate the gears that run the encoders. I'm not sure why they were done that way, as I was not involved in their design.

Ty Tremblay 01-12-2015 17:50

Re: pic: WCD off season chassis from 2471
 
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 01-12-2015 18:24

Re: pic: WCD off season chassis from 2471
 
Quote:

Originally Posted by Ty Tremblay (Post 1509144)
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 01-12-2015 18:46

Re: pic: WCD off season chassis from 2471
 
Do I spy shock absorbers? Or is that black ABS for spacing?

RobotsThatWork 01-12-2015 21:44

Re: pic: WCD off season chassis from 2471
 
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 01-12-2015 22:00

Re: pic: WCD off season chassis from 2471
 
Quote:

Originally Posted by RobotsThatWork (Post 1509179)
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.

R.C. 01-12-2015 22:12

Re: pic: WCD off season chassis from 2471
 
Quote:

Originally Posted by RobotsThatWork (Post 1509179)
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?

Bryce2471 01-12-2015 22:15

Re: pic: WCD off season chassis from 2471
 
Quote:

Originally Posted by JesseK (Post 1509151)
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.
Quote:

Originally Posted by RobotsThatWork (Post 1509179)
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.
Quote:

Originally Posted by Greg Woelki (Post 1509182)
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.

RobotsThatWork 01-12-2015 23:06

Re: pic: WCD off season chassis from 2471
 
Quote:

Originally Posted by R.C. (Post 1509187)
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 02-12-2015 07:59

Re: pic: WCD off season chassis from 2471
 
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 :confused: Care to give me some insight on the procedure? Are there access hole on the underside? Has anyone ever done this with belts?

notmattlythgoe 02-12-2015 08:09

Re: pic: WCD off season chassis from 2471
 
Quote:

Originally Posted by pribusin (Post 1509249)
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 :confused: 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.


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