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Wizzard3618 28-01-2017 12:53

Tubing for ball intake
 
We are looking at using some form of tubing for our ball intake from the ground, but we can't seem to find anything that has the durability and strength that we need. We were looking at the stuff from McMaster Carr, but they have so many choices. Anyone have any suggestions for us?

EricLeifermann 28-01-2017 13:04

Re: Tubing for ball intake
 
Polycarb tubing

D_Price 28-01-2017 13:15

Re: Tubing for ball intake
 
Make sure you get the solid-core if you are using for intake.

SenorZ 28-01-2017 14:16

Re: Tubing for ball intake
 
We're using this (for now) and it is working fine.
https://www.mcmaster.com/#round-belts/=16409ns

The connectors can be a pain though. You can use solid and "weld" it

chandrew 28-01-2017 14:52

Re: Tubing for ball intake
 
Normal surgical tubing is also an option you might want to consider.

Greg Hainsworth 29-01-2017 11:12

Re: Tubing for ball intake
 
make sure your tubing stays within the volume box. We considered this too but expect the judges to extend the tubing to it's maximum length and call that the limit of the robot volume.

Good Luck.

RoboChair 29-01-2017 20:59

Re: Tubing for ball intake
 
1.25" diameter aluminum 6061-T6 with a 1/16" wall thickness sometimes with surgical tubing on the outside(we add) is what 1678 runs for all our intake and ball stuff.

CalTran 29-01-2017 21:14

Re: Tubing for ball intake
 
Quote:

Originally Posted by Greg Hainsworth (Post 1637744)
make sure your tubing stays within the volume box. We considered this too but expect the judges to extend the tubing to it's maximum length and call that the limit of the robot volume.

Good Luck.

*Robot Inspectors, possibly Referees too.

Samueldobens 30-01-2017 08:49

Re: Tubing for ball intake
 
https://www.mcmaster.com/#flat-drive-belts/=164x37o

Team 341 had success with these for rebound rumble.

http://www.team341.com/history/2012-rebound-rumble/

Samueldobens 30-01-2017 08:52

Re: Tubing for ball intake
 
https://www.mcmaster.com/#flat-drive-belts/=164x37o

Team 341 had success with these for rebound rumble.

http://www.team341.com/history/2012-rebound-rumble/

This thread should give you all the information you need.

https://www.chiefdelphi.com/forums/s...ght=flat+belts

clydefrog88 30-01-2017 09:34

Re: Tubing for ball intake
 
Quote:

Originally Posted by RoboChair (Post 1637915)
1.25" diameter aluminum 6061-T6 with a 1/16" wall thickness sometimes with surgical tubing on the outside(we add) is what 1678 runs for all our intake and ball stuff.

Where do you guys source surgical tubing of that size? And how would you recommend pulling it onto a roller tube? Alcohol as a lubricant?

Thanks!

6101 Robert 30-01-2017 09:59

Re: Tubing for ball intake
 
What about orange urethane cord? Would that work well too?

We haven't built any intakes with urethane cord yet, but we have used in the past. From my experiences with it, it seems like it would work. It's also cheap and easy to build with.

clydefrog88 30-01-2017 10:11

Re: Tubing for ball intake
 
To share our recent experience with the McMaster 1" belt:

http://www.harborfreight.com/130-wat...ife-60313.html

This hot knife along with some clamped angle iron works wonders in joining the flat belts quickly. It's probably overkill for the solid core round tubing.

Also, I've seen a ~10% length reduction recommended for proper tension. This may be feasible for the small diameter round tubing, but you might find that stretching the flat belts that much makes intake assembly, well, difficult. I'm finding that we have sufficient belt tension by simply ignoring roller diameters.

Mike Marandola 30-01-2017 10:14

Re: Tubing for ball intake
 
Is it just me or are people talking about 3 different things? The structural tube for a roller, gripping material to put on the roller, and urethane belting.

RoboChair 30-01-2017 13:19

Re: Tubing for ball intake
 
Quote:

Originally Posted by clydefrog88 (Post 1638057)
Where do you guys source surgical tubing of that size? And how would you recommend pulling it onto a roller tube? Alcohol as a lubricant?

Thanks!

McMaster Carr specifically we use https://www.mcmaster.com/#5234k91/=1650h8o for our 1.25" OD rollers this year. Yes that is a 0.25" interference.

You cannot pull it on at all. You will need to use compressed air and someone with a reasonably strong arm. Zip-tie/safety-wire one end of the tubing to an air nozzle so that you get a good seal. Next you must plug off your aluminum roller so that air can't flow through it. one person controls air flow, the other holds the tube and tubing and does the hard part. turn on the air and begin pushing the latex on to the aluminum, DO NOT FOR ANY REASON clamp your hand down on the aluminum tube underneath the latex(your hand should never be that far up anyway) or you will get a 100psi balloon animal with a desire to pop. Alternate the airflow on and off to let you move your grip lower on the latex.

If you do not fully understand I can make a youtube video tutorial on Wednesday.


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