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  #16   Spotlight this post!  
Unread 17-01-2017, 10:52
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Re: Intake Conveyor Ideal Speed

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Originally Posted by wilsonmw04 View Post
you want the linear speed of your intake to be faster that you can drive forward. One of my build members, now an alum, has a rule of thumb that it should be twice as fast as your drive. Once you get it there, you can tweak it to suit your needs.
Second this.
Every ball intake I ever designed had a linear speed that at least matched our robot in high gear forward speed. This allows all the balls to clear the intake at the speed you're travelling so you don't start plowing them and pushing them out of the way.
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Unread 17-01-2017, 11:50
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Re: Intake Conveyor Ideal Speed

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Originally Posted by Skyehawk View Post
Mach 10
on the exterior 3" wheel, that would be over 71000 RPM. Scary.
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Unread 17-01-2017, 11:56
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Re: Intake Conveyor Ideal Speed

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Originally Posted by Peter Matteson View Post
Second this.
Every ball intake I ever designed had a linear speed that at least matched our robot in high gear forward speed. This allows all the balls to clear the intake at the speed you're travelling so you don't start plowing them and pushing them out of the way.
Here's an article that was done about an intake that was designed for the 2014 game that touches on this same concept, along other tips for designing an intake.

http://www.buildblitz.com/team-copioli-intake-design/
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Unread 17-01-2017, 17:45
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Re: Intake Conveyor Ideal Speed

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Originally Posted by cadandcookies View Post

You intake should command that the game pieces it touches enter your robot, not lightly suggest that they do.
+1
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Unread 17-01-2017, 17:47
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Re: Intake Conveyor Ideal Speed

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Originally Posted by Skyehawk View Post
Mach 10
Why not Warp 10 ?

Last edited by gerthworm : 17-01-2017 at 17:48. Reason: thought of a better and hopefully less snarky joke
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Unread 17-01-2017, 17:57
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Re: Intake Conveyor Ideal Speed

https://youtu.be/kXjiOVkhPv8

Here's a little video of a prototype we made, it's pretty fast but it could be even better once the compression distance is fixed right and belts are tightened.
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Unread 18-01-2017, 10:35
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Re: Intake Conveyor Ideal Speed

So just to be clear...
We are planning on using 1" diameter rollers with belts on them, and a 10fps drivetrain. We therefore are shooting for 15fps linear speed on the belts, which would mean a roller speed of ~3400 RPM. Does this seem right/plausible/safe?

*We are using 2" wide urethane orange belts with 3D printed crowned pulleys on the drive axle.
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Unread 18-01-2017, 11:14
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Re: Intake Conveyor Ideal Speed

Quote:
Originally Posted by matthewdenny View Post
So just to be clear...
We are planning on using 1" diameter rollers with belts on them, and a 10fps drivetrain. We therefore are shooting for 15fps linear speed on the belts, which would mean a roller speed of ~3400 RPM. Does this seem right/plausible/safe?

*We are using 2" wide urethane orange belts with 3D printed crowned pulleys on the drive axle.
I have your RPM's at 3400. someone check my math. But that's fast. try a larger roller.
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Last edited by wilsonmw04 : 18-01-2017 at 11:17.
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Unread 18-01-2017, 11:17
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Re: Intake Conveyor Ideal Speed

Quote:
Originally Posted by matthewdenny View Post
So just to be clear...
We are planning on using 1" diameter rollers with belts on them, and a 10fps drivetrain. We therefore are shooting for 15fps linear speed on the belts, which would mean a roller speed of ~3400 RPM. Does this seem right/plausible/safe?

*We are using 2" wide urethane orange belts with 3D printed crowned pulleys on the drive axle.
It looks ok to me based on those numbers. You can always change the gearing later. If it's running that fast you will not need very much compression to move the balls. The speed is fine, but make sure you are not at risk of stalling(when you test).
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Unread 18-01-2017, 11:27
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Re: Intake Conveyor Ideal Speed

Quote:
Originally Posted by Crew Cox View Post
So what I'm getting is fast as possible without;
Breaking/slipping a belt
Burning up/ stalling a motor
Obtaining liftoff?
I don't think liftoff should be ruled out.
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Unread 18-01-2017, 11:32
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Re: Intake Conveyor Ideal Speed

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Originally Posted by JamesCH95 View Post
... no one has ever said 'my intake can collect [game element] too quickly.'
This is good advice.

It is also important that your FUEL elevator be fast enough to keep up with your intake, so FUEL doesn't jam. My team made that mistake in 2012.
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Unread 18-01-2017, 11:58
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Re: Intake Conveyor Ideal Speed

Quote:
Originally Posted by Crew Cox View Post
So what I'm getting is fast as possible without;
Breaking/slipping a belt
Burning up/ stalling a motor
Obtaining liftoff?
When our intake grabbed a boulder last year the robot jumped, achieving momentary liftoff. it was perfect.

Make the game piece disappear from where it is on the floor to someplace inside your robot.
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Unread 18-01-2017, 12:10
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Quote:
Originally Posted by Crew Cox View Post
Hello all and thanks for reading.
For our fuel intake and shooter feed-conveyor we will likely be using 1 1/2 in. Aluminum rollers and 1 inch wide orange belting from McMaster Carr.
We will also likely be using a 775 pro with a versaplanetary to power both.
This said, does anyone have a approximate ideal spead for the belts to be moving?

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Unread 18-01-2017, 12:24
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Talking Re: Intake Conveyor Ideal Speed

I would use a vex planetary gearbox so you can adjust your reduction ratio after building the robot. Honestly, I think you'll want a medium speed, but...
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Unread 29-01-2017, 13:43
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Re: Intake Conveyor Ideal Speed

Good discussion,

I'm thinking that we're going to use a 10:1 Versa Planetary reduction with a 775 for our intake and elevator.

With 31 RPS, I think we'll be intaking fuel pretty fast.

Although I'm worried that we wont have enough power to lift palls up our elevator. Any experience with this?

Also, if we have wheels on our roller (1/2 shaft) how would I incorporate them into my calculations? Specifically on JVN.
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