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Unread 16-01-2017, 22:08
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Re: Intake Conveyor Ideal Speed

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Originally Posted by RoboChair View Post
+1 Touch it. OWN it.


Liftoff is fine, encouraged even.

We like our intakes going over 1000 RPM. Sometimes even faster, time waiting to intake is time you are not scoring. Touch it. OWN it.
3500 RPM too fast?
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Unread 16-01-2017, 22:11
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Re: Intake Conveyor Ideal Speed

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Originally Posted by Munchskull View Post
3500 RPM too fast?
You will have to test it and make sure it won't stall out, but it just depends on your surface speed requirements.
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Unread 17-01-2017, 10:22
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Re: Intake Conveyor Ideal Speed

I second the recommendation for AT LEAST 2x robot speed. The reason being that if the top of a ball is moving at 2x robot speed, the cewnter of the ball will move at 1x robot speed while the bottome of the ball touches the ground. Thus the FUEL will get get pulled into the robot significantly faster than the robot can drive.

The FUEL won't get knocked away and the robot won't jam the FUEL into its own intake with forward inertia. Perhaps most importantly in this year: if the robot interacts with a sea of game elements it won't push the bulk of FUEL away as it collects FUEL on the perimeter of that sea.

Strongly recommend the highest powered motor(s) you can stand for the application, even if you run it on an under-sized breaker (like a 775 pro on a 30A circuit). No one has ever said 'my intake can collect [game element] too quickly.' More to the point: the faster you can collect FUEL/GEARs/whatever the more time you have to score it, and there are fewer things more painful to a scout than watching a team spend time collecting game element.

My $0.02 anyway...
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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, 11:56
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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 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, 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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Unread 29-01-2017, 14:51
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Re: Intake Conveyor Ideal Speed

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Originally Posted by ImMoMo View Post
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.

Personally I would have your intake and elevator on seperate motors. It's probally best if you are capable of controlling them seperatly if a game piece jam happens. This should also take some of the stress off of that 775pro (even thogh it is overkill anyway)
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Unread 29-01-2017, 15:38
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Re: Intake Conveyor Ideal Speed

Quote:
Originally Posted by ImMoMo View Post
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.
You can guess how much force your intake will experience from lifting game pieces, compression, wheels on the shaft providing inertia, and a variety of other factors, but the best way to see if it will work is to prototype. If you haven't built a model of your intake with approx. the gear ratio you want, I would suggest doing that. If you don't have access to the right motor and gearbox, at least try with a hand drill on drill speed to make sure that you don't need too much torque.
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Unread 29-01-2017, 15:46
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Re: Intake Conveyor Ideal Speed

Quote:
Originally Posted by ImMoMo View Post
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.
Take your shaft speed (rev/s), multiply by wheel circumferential travel (ft/rev), and you'll get the collector 'surface speed' in ft/s. Compare to robot maximum speed, ...? Profit!
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Unread 29-01-2017, 20:07
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Re: Intake Conveyor Ideal Speed

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Originally Posted by JamesCH95 View Post
Take your shaft speed (rev/s), multiply by wheel circumferential travel (ft/rev), and you'll get the collector 'surface speed' in ft/s. Compare to robot maximum speed, ...? Profit!
That makes sense, although I'm still unclear on what you mean by circumferential travel.

Thanks.
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Unread 29-01-2017, 20:35
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Re: Intake Conveyor Ideal Speed

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Originally Posted by ImMoMo View Post
That makes sense, although I'm still unclear on what you mean by circumferential travel.

Thanks.
The circumference.
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Unread 29-01-2017, 21:24
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Re: Intake Conveyor Ideal Speed

Strong Necro is strong.
Aside from that, the 15:1 versaplanetary that we are using with 1 1/4" rollers and an orange poly belt is now throwing them over the back of our bot.
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Unread 30-01-2017, 10:10
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Re: Intake Conveyor Ideal Speed

775pro on a VP 10:1 seems to devour fuel at a good rate for us.

Using Banebots blue wheels (2-3/8"), and yellow urethane round belt.

Test: https://drive.google.com/file/d/0B7z...ew?usp=sharing

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