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Re: pic: Team 148 - 2011 - Raptor
I'm curious as to why you chose to stack plates instead of just cutting a thicker plate? I can understand if it was really thick for cost purposes, like over a half an inch, but wouldn't it be easier for a 3/8 piece to just cut one from a thicker piece of metal? I suppose if you're laser cutting then thicker aluminum isn't an option on all lasers because of aluminum's reflective properties.
I've also always been curious, are your parts lasered of waterjetted? |
Re: pic: Team 148 - 2011 - Raptor
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We align the plates (using a mating gear + eyeballs) and then clamp them with c-clamps before riveting. These are aluminum gears, and we figured they'd wear in happy. Again -- we were surprised how well this worked. We were expecting more hassle... but... it just works. -John |
Re: pic: Team 148 - 2011 - Raptor
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1. The laser does have some "blow out" which will affect the tooth profile in thicker materials. 2. Our shop stocks 1/8" 6061 aluminum, so we can get it without a special order. When I'm trying to get 24 hours turns, I try not to make our shop do anything they don't normally do for production. -John |
Re: pic: Team 148 - 2011 - Raptor
Cool stuff, John!
Maybe you guys need to start up a Robowranglers R&D division to test more neat ideas like this... you can attempt all kinds of weird projects that would normally be foolish to try during a build season*. Though it sounds like your offseason work already accomplishes this. :) *cough* walking robot *cough* *cough* |
Re: pic: Team 148 - 2011 - Raptor
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Re: pic: Team 148 - 2011 - Raptor
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We dislike chains that we need to worry about. This low-load application is pretty happy the way it is. |
Re: pic: Team 148 - 2011 - Raptor
We've used laser cut gears in manipulators before when a small range of motion was desired but Ive never thought about using them in a drive application. Be sure to post up at the end of the season about any wear issues you encountered because otherwise it is a very simple solution to custom gears. I'll be sure to check them out at alamo.
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Re: pic: Team 148 - 2011 - Raptor
I wonder if there is any maximum allowance of people/teams per pit. Looks like 148 is going have a crowd. Non-stop. :) Again.
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Re: pic: Team 148 - 2011 - Raptor
How do you generate the tooth profiles? Does IFI just have a piece of software that spits it out, do you do it by hand :ahh: , or is there a handy SW feature that I've missed that does it for you?
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Re: pic: Team 148 - 2011 - Raptor
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Re: pic: Team 148 - 2011 - Raptor
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Re: pic: Team 148 - 2011 - Raptor
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1. Pull out your handy Machinist's Handbook and sketch the tooth profile by hand. 2. Buy one of those gear profile generation programs and get it to spit it out for you. 3. Download the gear from somewhere online. bostongear.com has all their gears available online. For this year's robot we used option 3. I downloaded the gear I wanted from Boston gear, then traced over the tooth in Solidworks (eliminating splines with simple arcs, so it would import cleaner into our laser cutter's NC program). I grabbed this sketch, dropped it into a new sheetmetal part and away we went... -John |
Re: pic: Team 148 - 2011 - Raptor
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*Does anyone even use that term anymore? |
Re: pic: Team 148 - 2011 - Raptor
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http://blog.iamjvn.com/2011/02/insid...ve-module.html -John |
Re: pic: Team 148 - 2011 - Raptor
Nice drive module!
for making that strange gear for the arm lifter....you could also get the arm gear from a door window regulator from a car, and trace it onto the aluminum ![]() |
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