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-   -   Intake Conveyor Ideal Speed (http://www.chiefdelphi.com/forums/showthread.php?t=153784)

Peter Matteson 17-01-2017 10:52
Re: Intake Conveyor Ideal Speed
 
Quote:
Originally Posted by wilsonmw04 (Post 1632129)
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.

NoshBrooks 17-01-2017 11:50
Re: Intake Conveyor Ideal Speed
 
Quote:
Originally Posted by Skyehawk (Post 1632127)
Mach 10
on the exterior 3" wheel, that would be over 71000 RPM. Scary.

Karthik 17-01-2017 11:56
Re: Intake Conveyor Ideal Speed
 
Quote:
Originally Posted by Peter Matteson (Post 1632327)
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/

Jrizo 17-01-2017 17:45
Re: Intake Conveyor Ideal Speed
 
Quote:
Originally Posted by cadandcookies (Post 1632138)

You intake should command that the game pieces it touches enter your robot, not lightly suggest that they do.
+1

gerthworm 17-01-2017 17:47
Re: Intake Conveyor Ideal Speed
 
Quote:
Originally Posted by Skyehawk (Post 1632127)
Mach 10
Why not Warp 10 ?

gorrilla 17-01-2017 17:57
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.

matthewdenny 18-01-2017 10:35
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.

wilsonmw04 18-01-2017 11:14
Re: Intake Conveyor Ideal Speed
 
Quote:
Originally Posted by matthewdenny (Post 1632892)
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.

RoboChair 18-01-2017 11:17
Re: Intake Conveyor Ideal Speed
 
Quote:
Originally Posted by matthewdenny (Post 1632892)
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).

dkavanagh 18-01-2017 11:27
Re: Intake Conveyor Ideal Speed
 
Quote:
Originally Posted by Crew Cox (Post 1632130)
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.

Richard Wallace 18-01-2017 11:32
Re: Intake Conveyor Ideal Speed
 
Quote:
Originally Posted by JamesCH95 (Post 1632317)
... 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.

BJT 18-01-2017 11:58
Re: Intake Conveyor Ideal Speed
 
Quote:
Originally Posted by Crew Cox (Post 1632130)
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.

MikeDaigle 18-01-2017 12:10
Quote:
Originally Posted by Crew Cox (Post 1632124)
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?

Sent from my A0001 using Tapatalk

ShIfTiNgBoT 18-01-2017 12:24
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...

ImMoMo 29-01-2017 13:43
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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