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  #16   Spotlight this post!  
Unread 18-08-2005, 22:29
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Re: pic: 2 speed V.3

I think running a 8-tooth sprocket on #35 chain is not a good thing, or so I've heard.
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  #17   Spotlight this post!  
Unread 18-08-2005, 22:40
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Re: pic: 2 speed V.3

Quote:
Originally Posted by NoodleKnight
I think running a 8-tooth sprocket on #35 chain is not a good thing, or so I've heard.
Did someone say it was going to be an 8? Anyway, some would say (me) running #35 chain on an FRC drivetrain is not a good thing (overkill, too heavy).
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  #18   Spotlight this post!  
Unread 18-08-2005, 22:57
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Re: pic: 2 speed V.3

Quote:
Originally Posted by Arefin Bari
I need someone to tell me and prove it to me saying that this transmission doesn't work and the robot won't move with this transmission, not the fact that drivers will need a lot of practice.

I am calling out the engineers out there. Please help me figure this out. Thanks.
While the mechanics of a transmission are obviously important, I still think it's very (if not equally) important to make sure your drivers can work with it. I can design a 6 speed crab-omni-maks belgian waffles drive (ok maybe not, but you get my point) but if it leaves the drivers in the station scratching their heads, its completely useless. Equally useless if its just too fast/slow/whatever. I just wanted to make that point.

I think I made all the points I wanted to, so I don't plan on revisiting this thread anymore.

Back to fixing my amnesiac computers...
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Unread 18-08-2005, 23:01
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Re: pic: 2 speed V.3

Quote:
Originally Posted by Arefin Bari
T I can play with the sprocket, in the configuration I have right now... if I replace the 10 tooth sprocket wtih a 8 tooth sprocket (on the output shaft of the gearbox), the robot is going 5 fps on low and 10 fps on high. If I change the wheel size to 6 and change the wheel sprocket to 40 tooth, the robot is going 11 fps on high and 5.8 on low.
Arefin,
First off this is very good progress. I have a comment about the high speed. I would suggest you leave it at 13fps because although the drivers will rarely use it at full speed, for some games it can be very useful to be able to run around the field quickly. This year our robot was able to pull of a practical(not theoretical) 14.4 fps but we almost NEVER used that sort of speed on the field. It came in useful at the end of the match when we needed to get back behind the line, probably because the acceleration rate was high. If it was not that fast, I know we would have not made it back and probably lost the match.
-Bharat
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  #20   Spotlight this post!  
Unread 18-08-2005, 23:08
sanddrag sanddrag is offline
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Re: pic: 2 speed V.3

I would concur that if the drivers can handle it, go for 13-14 fps. Our drivers rarely used all that speed, but they certainly could have. I've driven it at that speed and it is great for me.

The way I see it is greater speed = greater productivity. Just make sure you don't have to downshift to turn, or you may lose that productivity.

Anyway, you can always adjust the sprocket ratios in the end. I haven't found a 8T #35 (only in #25) but a 9T is available and you could always go slightly bigger on the wheel one (I don't know how close you are to the 4" diameter though).
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  #21   Spotlight this post!  
Unread 18-08-2005, 23:44
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Re: pic: 2 speed V.3

#35 chain on a robot is a good thing, in some cases, it just depends on how it is used in the drive-train or any part of the robot for that matter.

We have had cases where #25 chain has broken.

For example we used #35 chain in 2004 to connect the transmission to the back wheels and we then used #25 chain to connect the back wheels to the front wheels in the skid steer configuration.
We had a case in a 2004 practice match where the #25 chain broke, our robot still had three wheels driven, instead of four, but we still made it up the 6'' platform.

Now if the #35 chain would have been replaced with #25 chain, it may have broken causing us to have two wheel drive and that equals no go!

Give Arefin a break about the square edges, did anyone ever think he may be designing the tool path for the CNC to follow, or maybe he is just trying to save some time? Drawings don't have to be perfect, he is just trying to get his idea out there.

Anything under 14fps (calculated free speed) should be good, the control of the robot also depends on the drive train type not just the speed, along with many other factors.

The calculated free speeds for our 2005 robot with only 2 CIMS powering the whole drive train is 4fps in low and 12fps in high using 5,342RPM as the free speed.

The 8 tooth #35 sprocket may work, it depends on how big the sprocket is that he is planning on using the chain to connect to, along with many other things.

I would keep the plates 1/4'' thick, anything much thinner does not allow for easy bearing/bushing mounting. Thicker plates also make the transmission more rigid.

Keep at it and I am sure that you're transmission placed on a robot will be able to move something out of the way!
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