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 Checklist: Robot on, thinkamajig set, autonomous set, safety bar pulled. - DonRotolo [more] |
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Ask if you have any questions.
I have made this chassis for practice and to try out sheet metal maybe sometime soon. We have a sponsor with some crazy bending and cnc laser machines so we figured we would try to take advantage of that. What you see here is a Tex-Hex-Coast drive inspired by 148 and 971. It is made entirely of .090" 6061 T6 except for the stainless steel .125" wheel module plates. I also took some design ideas from 3847 and 3928. Leave comments and feel free to leave suggestions. I am trying to make this the best it can be.
Discussion
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03-07-2014 00:02
AllenGregoryIV
Re: pic: 4587-Sheet Metal Chassis
Very cool Cooper, a lot of things I plan to look into in the fall are in this.
One thing that I am definitely going to look at adding is a belt or chain connecting the modules on each side. 148 has them this year. I think it's a huge improvement for when two of the wheel modules come off the ground.
I am also going to try to remove the plates that mount the motors inside of the wheel wells. They caused us problems since they aren't really piloted with gear they are driving. We have had some gear wear issues because of it.
What gearing is this designed for right now? We are definitely looking at going faster next year with the amount of motors we can put on the drive. We did 6:1 and 14:! this year and we could have probably done closer 5:1 and been fine.
Also I like the third CIM mount, 12 motor drive is the future for sure. (before anyone doesn't get this, that was a joke)
03-07-2014 00:25
Cash4587
Re: pic: 4587-Sheet Metal Chassis
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Originally Posted by AllenGregoryIV
Very cool Cooper, a lot of things I plan to look into in the fall are in this.
One thing that I am definitely going to look at adding is a belt or chain connecting the modules on each side. 148 has them this year. I think it's a huge improvement for when two of the wheel modules come off the ground. I am also going to try to remove the plates that mount the motors inside of the wheel wells. They caused us problems since they aren't really piloted with gear they are driving. We have had some gear wear issues because of it. What gearing is this designed for right now? We are definitely looking at going faster next year with the amount of motors we can put on the drive. We did 6:1 and 14:! this year and we could have probably done closer 5:1 and been fine. Also I like the third CIM mount, 12 motor drive is the future for sure. (before anyone doesn't get this, that was a joke) |
You are going to remove the interior gearbox plates? Are you going to try to float the motors with the wheels like 1477 did?
It is designed for a 5:1 for 4" Omni Wheels, and 14.4 for the 3.25" traction wheel. Should be good enough for this type of setup. I think the speed will be just right for the type of driving I like to do.
Oh, and those strategically placed Swiss cheese holes may never be used
03-07-2014 00:39
AllenGregoryIV
Re: pic: 4587-Sheet Metal Chassis
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Originally Posted by Cash4587
You are going to remove the interior gearbox plates? Are you going to try to float the motors with the wheels like 1477 did?
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03-07-2014 00:51
Cash4587
Re: pic: 4587-Sheet Metal Chassis
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Originally Posted by AllenGregoryIV
We definitely won't float the motors. I'm not sure exactly what the plan is yet but the we need a better way to force the plate to be aligned properly if we would do it again. I have also thought about moving the motor mounts to between the two wheels but haven't actually CADed anything yet.
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03-07-2014 01:05
Joe G.
Re: pic: 4587-Sheet Metal Chassis
If this is your first time with sheet metal, definitely talk to your sponsor and find out what bend radius they recommend for a given thickness, as this will be driven by the tooling they use. Usually not a huge deal, but updating this after the fact can be somewhat hairy on complex structures depending on how you define your flanges.
Right now, your radii look far larger than what I typically see used for .090" Aluminum, although 6061 vs. 5052 would call for a larger bend radius. Generally, 5052 is recommended for sheet metal work, but some teams do use bent 6061.
03-07-2014 01:25
AllenGregoryIV
Re: pic: 4587-Sheet Metal Chassis
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Originally Posted by Cash4587
I am definitely going to keep the shape of the chassis like this though. I hadn't really understood the reason behind 148 and 971's hex and ocot sided frames until you told me at Comic-palooza.
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03-07-2014 01:57
Cash4587
Re: pic: 4587-Sheet Metal Chassis
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Originally Posted by Joe G.
If this is your first time with sheet metal, definitely talk to your sponsor and find out what bend radius they recommend for a given thickness, as this will be driven by the tooling they use. Usually not a huge deal, but updating this after the fact can be somewhat hairy on complex structures depending on how you define your flanges.
Right now, your radii look far larger than what I typically see used for .090" Aluminum, although 6061 vs. 5052 would call for a larger bend radius. Generally, 5052 is recommended for sheet metal work, but some teams do use bent 6061. |
03-07-2014 02:00
Cash4587
Re: pic: 4587-Sheet Metal Chassis
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Originally Posted by AllenGregoryIV
Yes hex chassis designs are going to be very popular in the coming years. Depending the game I wouldn't be surprised to see 50+ next year. However the GDC could easily through a huge obstacle in the middle of the field and make it harder to use standard drive trains.
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03-07-2014 08:31
BBray_T1296
Re: pic: 4587-Sheet Metal Chassis
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Originally Posted by Cash4587
It seems like it will be soon that the GDC will put a huge obstacle on the field.
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03-07-2014 08:32
BrendanB
Re: pic: 4587-Sheet Metal Chassis
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Originally Posted by Cash4587
I am definitely going to keep the shape of the chassis like this though. I hadn't really understood the reason behind 148 and 971's hex and ocot sided frames until you told me at Comic-palooza.
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Every team needs to come up with their own opinions but our team won't be doing a multi-sided robot again for the purpose of making it harder to pin us.
04-07-2014 00:06
Cash4587
Re: pic: 4587-Sheet Metal Chassis
I've done some reworking to remove the gearbox motor plates. The motors now mount directly to the channels which contain the wheel modules. I also added a handy battery mount.
Image found here:
http://prntscr.com/3z85k1
27-08-2014 23:20
RoundTabler
Re: pic: 4587-Sheet Metal Chassis
What are you using to articulate your modules? I can't figure out how you plan to drop the traction wheel. 
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