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 WE might have a different plan than being overweight, but thats just my guess - pakrat [more] |
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Our robot was 15 lbs overweight (for a variety of reasons, mostly sheet metal which is a new construction material to us) so we got some 3" hole saws and went to town. We also cut down mounting brackets and made a new gripper mech that was simpler.
All in all, not too shabby. Still not finished by any means but we are much closer to our goals. Now time to practice, practice, practice.
Discussion
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09-02-2014 16:59
Jon Stratis
Re: pic: Swiss Cheese Weight Loss
That's a nice looking robot! I have to ask though... how far back does that hammer pull?
09-02-2014 17:49
IKE
Re: pic: Swiss Cheese Weight Loss
Some tips I have learned over the years on how to reduce weight for your robot:
http://www.chiefdelphi.com/media/papers/2220
09-02-2014 18:35
MrBydlon
Re: pic: Swiss Cheese Weight Loss
When parallel with the ground, the hammer is about 16" outside of the frame perimeter I think... It's definitely less than the 20" frame perimeter. I just can't remember the exact number.
The perspective of the camera makes the hammer look longer than it is maybe.
09-02-2014 19:12
DonRotolo
Re: pic: Swiss Cheese Weight Loss
I can imagine using something to reduce the weight of the hammer's handle. Like 1" x 1/8" square box stock.
...or just round it off and paint it silver.
09-02-2014 21:19
Jonathan Norris
Re: pic: Swiss Cheese Weight Loss
The quickest way for you guys to lose weight would be to move to smaller nuts and bolts. My eyes see a lot of 1/4" bolts, which are usually overkill for FRC. I've removed over 30 lbs of 1/4" bolts from a robot before... you can replace 1/4" bolts with #10's, #8's, and rivets in most situations.
09-02-2014 21:45
MrBydlon
Re: pic: Swiss Cheese Weight Loss
Oh for sure! We will definitely do that in the future. Thanks for the suggestions!
The power point from above was very illuminating (lots of DUHHHHHH moments that we had never really considered).
This is going to sound impossible but we had never done rivets before on a robot. I had no idea they were so simple and lightweight and just generally awesome.
We've always done 1/4-20 bolts. Like, always. The idea had never really occurred to do something different until late in the build. We will definitely be investing in more button heads and smaller bolts in the future.
Lots of learning going on this season.
09-02-2014 21:47
cadandcookies
Re: pic: Swiss Cheese Weight Loss
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Originally Posted by Jonathan Norris
The quickest way for you guys to loose weight would be to move to smaller nuts and bolts. My eyes see a lot of 1/4" bolts, which are usually overkill for FRC. I've removed over 30 lbs of 1/4" bots from a robot before... you will find you can use #10's, #8's, and rivets in most situations.
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09-02-2014 21:54
kevin.li.rit
Re: pic: Swiss Cheese Weight Loss
Don't forget to remove all that extra code.
09-02-2014 21:59
Mr_D_Mentor
Re: pic: Swiss Cheese Weight Loss
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Originally Posted by Jonathan Norris
The quickest way for you guys to lose weight would be to move to smaller nuts and bolts. My eyes see a lot of 1/4" bolts, which are usually overkill for FRC. I've removed over 30 lbs of 1/4" bolts from a robot before... you can replace 1/4" bolts with #10's, #8's, and rivets in most situations.
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09-02-2014 22:24
MrBydlon
Re: pic: Swiss Cheese Weight Loss
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Originally Posted by kevin.li.rit
Don't forget to remove all that extra code.
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10-02-2014 07:21
DELurker
Re: pic: Swiss Cheese Weight Loss
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Originally Posted by MrBydlon
This is going to sound impossible but we had never done rivets before on a robot. I had no idea they were so simple and lightweight and just generally awesome.
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10-02-2014 07:45
Calvin Hartley
Re: pic: Swiss Cheese Weight Loss
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Originally Posted by DELurker
...if you do them incorrectly or overload them, they'll fail you.
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10-02-2014 07:45
Bill_B
Re: pic: Swiss Cheese Weight Loss
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Originally Posted by Mr_D_Mentor
For an average length of 1.5", a 1/4" bolt weighs about .022 lb, so it would take about 1350 bolts to make 30 lb.
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10-02-2014 09:20
Taylor
Re: pic: Swiss Cheese Weight Loss
We've always been 1/4-20 folk too. This is because the IFI and AM kit chassis were all 1/4" or 3/8" holes - we just kept consistent throughout.
Now that the new AMoneforYou chassis has .190 holes, we'll be switching to 10-bolts and rivets.
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