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I wonder how many teams would love this on their work bench?
Discussion
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30-01-2006 00:37
sanddrag
Re: pic: Bag of DeWalts
We would love to have those on our workbench, and soon we will 
Doesn't look like a great way to transport them though, especially with those fragile servos.
My 4500th post! Hooray, I guess. On my way to 5 thousand.
30-01-2006 01:16
phrontist
Re: pic: Bag of DeWalts
We are so very close to having two of those... why do you have so many? What could you possibly need that many for...
30-01-2006 01:31
sanddrag
Re: pic: Bag of DeWalts
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Originally Posted by phrontist
We are so very close to having two of those... why do you have so many? What could you possibly need that many for...
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30-01-2006 11:03
Wayne C.
Re: pic: Bag of DeWalts
we DO have a bag like that-
tried them and rejected them
too slow and cumbersome for the game (although the power is good)
Good luck
WC
30-01-2006 16:11
Kyle A
Re: pic: Bag of DeWalts
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Originally Posted by DCA Fan
Santa clearly came early this year.
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Very nice looking though.
11-11-2006 23:13
Po-ser
Re: pic: Bag of DeWalts
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Originally Posted by Wayne C.
we DO have a bag like that-
tried them and rejected them too slow and cumbersome for the game (although the power is good) Good luck WC |
We're trying to make our own mock-chassis before build season to test out the Dewalts. I have a lackluster design in the process the Inventor rendering of which I'll try to post, but it would be great to have some input even here.... Why are the Dewalts slow? Or are you referring to the process of putting a transmission like that together?
13-11-2006 15:37
Gary Dillard
Re: pic: Bag of DeWalts
I'm puzzled too Wayne. We (SPAM) used NBD's for our drivetrain the last 2 years, never had a problem with them, plenty of speed and torque, definitely the fastest we've ever assembled our chassis and drive train since they were so simple to put together. Cumbersome? Find me a more compact 3 speed shifting gearbox, simple to build, simple to mount, simple to changeout.
And robust - SPAM has a bag like that also; 2 years times 4 spares that we never needed and can't use again since they were built in a previous year (just the gearboxes - the motors are OK to use).
13-11-2006 17:04
Wayne C.
Re: pic: Bag of DeWalts
OK-
Prior to the 05 season we buillt a protochassis with Dewalts on each of 4 wheels. When tested against our 2003 gearbox in a pushing contest they over-strained and popped out the breakers consistently. Likewise we ran the robot into a wall and found they popped out easily when the robot was forced to stall.
That and the approximate 20% reduction in speed wasn't worth changing the existing prototypes we have been using. Perhaps the term cumbersome was inaccurate because they are easy to pop in and such but we found they would be buried deep in the chassis and hard to get to under the upper deck.
Yes- it is nice to pop in a prebuilt gearbox, but they werent handling the strain we put on them. We still have them and I can visualize using them for non-drive train applications.
We have something new in the works for 2007- a little stronger and much lighter than the 03 or 06 machines. We didn't like the idea that some bots could trap us in the corner at times during the season so we designed a simple alternative.
WC 
13-11-2006 19:05
lukevanoort
Re: pic: Bag of DeWalts
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Originally Posted by Wayne C.
OK-
Prior to the 05 season we buillt a protochassis with Dewalts on each of 4 wheels. When tested against our 2003 gearbox in a pushing contest they over-strained and popped out the breakers consistently. Likewise we ran the robot into a wall and found they popped out easily when the robot was forced to stall. That and the approximate 20% reduction in speed wasn't worth changing the existing prototypes we have been using. Perhaps the term cumbersome was inaccurate because they are easy to pop in and such but we found they would be buried deep in the chassis and hard to get to under the upper deck. Yes- it is nice to pop in a prebuilt gearbox, but they werent handling the strain we put on them. We still have them and I can visualize using them for non-drive train applications. We have something new in the works for 2007- a little stronger and much lighter than the 03 or 06 machines. We didn't like the idea that some bots could trap us in the corner at times during the season so we designed a simple alternative. WC |
13-11-2006 19:24
Joel J
Re: pic: Bag of DeWalts
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Originally Posted by Wayne C.
OK-
Prior to the 05 season we buillt a protochassis with Dewalts on each of 4 wheels. When tested against our 2003 gearbox in a pushing contest they over-strained and popped out the breakers consistently. Likewise we ran the robot into a wall and found they popped out easily when the robot was forced to stall. That and the approximate 20% reduction in speed wasn't worth changing the existing prototypes we have been using. Perhaps the term cumbersome was inaccurate because they are easy to pop in and such but we found they would be buried deep in the chassis and hard to get to under the upper deck. Yes- it is nice to pop in a prebuilt gearbox, but they werent handling the strain we put on them. We still have them and I can visualize using them for non-drive train applications. We have something new in the works for 2007- a little stronger and much lighter than the 03 or 06 machines. We didn't like the idea that some bots could trap us in the corner at times during the season so we designed a simple alternative. WC |
13-11-2006 21:05
Alex Golec
Re: pic: Bag of DeWalts
I was about to say that looks like more than 15 pounds of spare parts... but after checking the official definition and then subtracting the motor weights, that looks like you only have 5 pounds of spares there 
This past season was the first time our team used these, and I have to say, they really get the job done - lightweight, simple to make, and versatile!
Plus, they fit in your carry-on. If they let you through. 
_Alex
13-11-2006 21:10
Bharat Nain
Re: pic: Bag of DeWalts
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Originally Posted by Joel J.
My curiosity level is steadily going up.. are you going to have a different set of wheels that lower to change speed? Or wait.. are you purposely not saying what you are doing (lol)?
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13-11-2006 23:29
Alex Golec
Re: pic: Bag of DeWalts
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Originally Posted by Bharat Nain
You are kinda close with dropping a different set of wheels thing. We have a model that does something like that but it all depends on the game. The drive train next year will be different though.
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Now all you need are some variable diameter wheels and you'll be all set for the rest of robotics.
14-11-2006 01:26
Gabe
Re: pic: Bag of DeWalts
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Originally Posted by Alex469
Now all you need are some variable diameter wheels and you'll be all set for the rest of robotics.
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15-11-2006 15:18
Mr. Van
Re: pic: Bag of DeWalts
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Originally Posted by Wayne C.
Prior to the 05 season we buillt a protochassis with Dewalts on each of 4 wheels. When tested against our 2003 gearbox in a pushing contest they over-strained and popped out the breakers consistently. Likewise we ran the robot into a wall and found they popped out easily when the robot was forced to stall.
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Were these 'bots ('03 and prototype) geared to have the same gear ratio (ie. the same 'bot speed at the same motor RPM)?
-Mr. Van
Coach, RoboDox 599
15-11-2006 22:38
Wayne C.
Re: pic: Bag of DeWalts
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Originally Posted by Mr. Van
I'm confused here. Do you mean that the circuit breakers kept tripping (and presumably resetting) or do you mean that the DeWalt popped out of gear into neutral?
Were these 'bots ('03 and prototype) geared to have the same gear ratio (ie. the same 'bot speed at the same motor RPM)? -Mr. Van Coach, RoboDox 599 |
The circuit breakers tripped. In most of the gearboxes you can usually make a wedge or something to prevent the shifting (at least the manual means).
The 03 bot was geared to be a little faster but we hoped that we could use the Dewalts as a replacement with little loss of speed. Instead of making a sophisticated gearbox and adding the Dewalts to it we hoped to bypass the need for two nested gearboxes. After all, why would we want to add them if we were building a gearbox anyway? (no need to reply) The Dewalts simply didnt function to our requirements.
For many teams these might be the answer to their needs. It depends on how hard you press them.
WC
16-11-2006 20:29
nparikh
Re: pic: Bag of DeWalts
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Originally Posted by Wayne C.
The circuit breakers tripped. In most of the gearboxes you can usually make a wedge or something to prevent the shifting (at least the manual means).
The 03 bot was geared to be a little faster but we hoped that we could use the Dewalts as a replacement with little loss of speed. Instead of making a sophisticated gearbox and adding the Dewalts to it we hoped to bypass the need for two nested gearboxes. After all, why would we want to add them if we were building a gearbox anyway? (no need to reply) The Dewalts simply didnt function to our requirements. For many teams these might be the answer to their needs. It depends on how hard you press them. WC |
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