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Unread 02-15-2018, 09:38 PM
VIKotic Dave VIKotic Dave is offline
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OVER WEIGHT

Anyone else over weight. we are so
1) Swiss cheese the bot
2) smaller font in programming
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Unread 02-15-2018, 09:43 PM
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Re: OVER WEIGHT

Not so far. Have fun...

If you can figure out how to make parts smaller, and from other materials, you might be able to remove weight with less work than by drilling holes. I'm sure you could get some helpful suggestions by posting a few detailed pictures of your robot.
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Unread 02-15-2018, 09:49 PM
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Re: OVER WEIGHT

Quote:
Originally Posted by VIKotic Dave View Post
Anyone else over weight. we are so
1) Swiss cheese the bot
2) smaller font in programming
Make sure your compiler uses more zeroes than ones as well. Those electrons really add up!
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Unread 02-15-2018, 09:54 PM
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Re: OVER WEIGHT

Good idea on trying a smaller font. I would try removing comments from your code. You have no idea how much weight comments add to your code. Being overweight is usually the programmer's fault.

But seriously, I would recommend trying to:
A) Remake part out of lighter materials
B) Remove unnecessary parts/support (a lot of teams are overweight because of over-engineering)
C) Possibly removing mechanisms (if feasible)

I would try all that before swiss-cheesing. I see that as a last-resort option.
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Unread 02-15-2018, 09:56 PM
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Re: OVER WEIGHT

Mini-Cims are .6 lbs lighter than Cims and if you can live with 2/3 the power are an easy swap
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Unread 02-15-2018, 10:02 PM
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Re: OVER WEIGHT

Quote:
Originally Posted by BenDSterling View Post
Good idea on trying a smaller font. I would try removing comments from your code. You have no idea how much weight comments add to your code. Being overweight is usually the programmer's fault.
The compiler is smart enough to exclude comments from the final code. What you'll really want to do is use short ints, chars, and floats instead of the bigger, heavier datatypes.
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Unread 02-15-2018, 10:24 PM
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Re: OVER WEIGHT

We were on Monday. So we redesigned our climbing method and shed 24 lbs on Tuesday. Now we're slowly adding some of that back on.

There was only one other year my team has even been close on weight. A bit of an eye opener for our design team students!
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Unread 02-15-2018, 10:28 PM
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Re: OVER WEIGHT

Quote:
Originally Posted by bobbysq View Post
The compiler is smart enough to exclude comments from the final code. What you'll really want to do is use short ints, chars, and floats instead of the bigger, heavier datatypes.
Don't forget that all the names you assign in your code should take the least possible space, go with smaller/shorter names
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Unread 02-15-2018, 11:22 PM
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Re: OVER WEIGHT

Lexan plastic is an amazing material when used right; light but flexible, useful for mounting electronics, belly pans, etc...

Some hole saws and a drill work wonders when you space the holes right and make them look intentional.

Use .1 instead of 1 in the code, its one tenth the weight.

anecdote: Last year we cut our bot in half from front to back, shaved an inch of the width, and welded it back together... on the Saturday before bag-n-tag... I wouldn't recommend this
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Unread 02-15-2018, 11:41 PM
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Re: OVER WEIGHT

Change your numerals on your bumpers from logos to FRC legal numerals. The extra paint/ink/etc used can throw the weight off.

But keep in mind FRC's strict rules on Numerals in 2017 (R27c3) - and then again in 2016 (R28)...

Numeral (nu·mer·al; n(y)o͞om(ə)rəl/) : a figure, symbol, or group of these denoting a number.

But FIRST went even further and only allows for ARABIC Numerals (2018 R28) - so...


Oh wait, Bumpers are not considered in the weight of the robot.

I guess try using Python? Maybe the code uses fewer lines... not sure, lead mentor here, not a programmer by trade.

Good Luck in the pocket-holing! We do have a brand-new Milwaukee Portable Bandsaw (that may not be used to much following SpecCheck/Feb 13 update) - we would be more than willing to lend it out!
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Unread 02-16-2018, 12:04 AM
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Re: OVER WEIGHT

Aluminum weighs about 0.1 lbs per cubic inch. Take how overweight you are, multiply it by 10, and that's the volume of aluminum you've got to remove. If you are drilling 1" holes in 1/8th inch aluminum, you've got to drill 10 holes to get 1 cubic inch of volume.

For us, that's (currently) 13 lbs. So, 130 cubic inches of aluminum, or 1300 1" holes. So... we're gonna find some denser things (steel, copper) or large prefabricated aluminum assemblies to remove first.
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Unread 02-16-2018, 12:10 AM
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Re: OVER WEIGHT

Last year was one of the only years we didn't have to cheese hole our robot. We made things advanced lighter (pocketing patterns and such). We did have to cut weight a couple times so we switched from 4" x 2" Colsons to 4" x 1.5" Colsons and saved half a pound I think. We switched an intake plate from aluminum to poly carbonate and saved quite a bit of weight. Switching things to poly carbonate is a really easy way to save weight.
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Unread 02-16-2018, 12:17 AM
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Re: OVER WEIGHT

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Unread 02-16-2018, 12:46 AM
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Re: OVER WEIGHT

Quote:
Originally Posted by Ian Curtis View Post
Aluminum weighs about 0.1 lbs per cubic inch. Take how overweight you are, multiply it by 10, and that's the volume of aluminum you've got to remove. If you are drilling 1" holes in 1/8th inch aluminum, you've got to drill 10 holes to get 1 cubic inch of volume.

For us, that's (currently) 13 lbs. So, 130 cubic inches of aluminum, or 1300 1" holes. So... we're gonna find some denser things (steel, copper) or large prefabricated aluminum assemblies to remove first.
You should learn to be friends with 1/16th wall tubing!

EDIT:
Steel is about 7.8g/cm^2
Aluminum is ~1/3rd the weight per volume of steel
Plastics are ~1/2 the weight of aluminum per volume
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Unread 02-16-2018, 12:55 AM
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Re: OVER WEIGHT

Quote:
Originally Posted by RoboChair View Post
You should learn to be friends with 1/16th wall tubing!

EDIT:
Steel is about 7.8g/cm^2
Aluminum is ~1/3rd the weight per volume of steel
Plastics are ~1/2 the weight of aluminum per volume
Can't remove as much weight by drilling holes with thinner walls on the tubing.


We were sitting at about 85* with one major subsystem to add a couple nights ago.


Question for the OP: How overweight are you, and how did you determine how overweight you are?




*Or more, depending whose foot was on the scale...
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