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  #31   Spotlight this post!  
Unread 12-01-2013, 19:25
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Re: Best motor/gearing option to drive a shooter?

Quote:
Originally Posted by Ether View Post
You posted this identical post in three different threads.

http://www.chiefdelphi.com/forums/sh...46#post1213846

http://www.chiefdelphi.com/forums/sh...56#post1213856

It might be better to post it once and provide a link.


Sorry didn't think about the link idea.
I'll do better next time.
Thanks
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  #32   Spotlight this post!  
Unread 12-01-2013, 19:26
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Re: Best motor/gearing option to drive a shooter?

At full battery voltage and no speed control.
Ya, it's primitive but it works. We will be looking into PID or bang bang later.
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  #33   Spotlight this post!  
Unread 12-01-2013, 19:28
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Re: Best motor/gearing option to drive a shooter?

Quote:
Originally Posted by DonRotolo View Post
Sounds like a direct drive to a 6" wheel would be the same.
The larger diameter provides a slightly longer contact path.



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Unread 12-01-2013, 19:30
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Re: Best motor/gearing option to drive a shooter?

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Originally Posted by Bruceb View Post
Sorry didn't think about the link idea.
I'll do better next time.
Thanks
It's a great post though. The problem is, it's going to be difficult following the discussion. You've already got responses in two threads.


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Unread 12-01-2013, 19:32
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Re: Best motor/gearing option to drive a shooter?

We were looking into gearing up our CIM motor to 6000-8000rpm and running an 8in pneumatic wheel. Originally we were looking to gear up a toughbox but after realizing that they only seel 12-14 teeth gears for CIM motors, we'll probably just use belts and sprockets
  #36   Spotlight this post!  
Unread 12-01-2013, 19:34
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Re: Best motor/gearing option to drive a shooter?

Quote:
Originally Posted by Bruceb View Post
At full battery voltage and no speed control
Quote:
Originally Posted by Aroki View Post
We were looking into gearing up our CIM motor to 6000-8000rpm and running an 8in pneumatic wheel.
FYI, Team 2073 found that above a certain wheel speed, the frisbee exit velocity actually decreased.

http://www.chiefdelphi.com/forums/sh...2&postcount=55



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Unread 12-01-2013, 19:37
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Re: Best motor/gearing option to drive a shooter?

Something for the 8000 rpm, that's assuming free spin, which isn't accurate for a motor under load conditions. The CIM has to turn the wheel, so it's going to be something less than 8000. It won't be an amazing drop but 7000 - 7500 is probably more reasonable.
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  #38   Spotlight this post!  
Unread 12-01-2013, 19:40
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Re: Best motor/gearing option to drive a shooter?

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Originally Posted by smclean1969 View Post
Something for the 8000 rpm, that's assuming free spin, which isn't accurate for a motor under load conditions. The CIM has to turn the wheel, so it's going to be something less than 8000. It won't be an amazing drop but 7000 - 7500 is probably more reasonable.
Could be a lot less than that if the wheel is generating vibration and windage.

Hint: measure the CIM current with a clamp-on ammeter. Then estimate the CIM speed from the voltage and current, as shown here.



  #39   Spotlight this post!  
Unread 12-01-2013, 19:56
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Re: Best motor/gearing option to drive a shooter?

Quote:
Originally Posted by Ether View Post
FYI, Team 2073 found that above a certain wheel speed, the frisbee exit velocity actually decreased.

This is definitely interesting, though they're using (from what I can tell)
8" Plaction Wheel from AndyMark while we're using a rubber wheel which may be turned to better fit the frisbee so I guess we'll have to build the belt/sprocket mockup before we can really test what the effective speed is.
  #40   Spotlight this post!  
Unread 13-01-2013, 18:08
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Re: Best motor/gearing option to drive a shooter?

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Originally Posted by Ether View Post
Who said they are running it at full voltage ?
http://www.chiefdelphi.com/forums/sh...40&postcount=7


  #41   Spotlight this post!  
Unread 13-01-2013, 18:11
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Re: Best motor/gearing option to drive a shooter?

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Originally Posted by Ether View Post
Could be a lot less than that if the wheel is generating vibration and windage.
Anybody planning to buy 8" pneumatic and run it at 8000 rpm read this thread:

http://www.chiefdelphi.com/forums/sh...d.php?t=111118



  #42   Spotlight this post!  
Unread 14-01-2013, 05:44
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Re: Best motor/gearing option to drive a shooter?

Is there anyone considering using dual banebot 550's to drive their shooter?
  #43   Spotlight this post!  
Unread 14-01-2013, 09:41
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Re: Best motor/gearing option to drive a shooter?

Yes.
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