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Unread 01-31-2005, 12:07 PM
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pic: 1382 Brazil - Gear box

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Unread 01-31-2005, 12:08 PM
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I <3 enclosed gearboxes

sweet looking gearbox...will there be any more pictures coming our way?
what are those gears made of?
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Unread 01-31-2005, 12:34 PM
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Re: pic: 1382 Brazil - Gear box

Wow those look really professional. I bet they weigh very little as well. I'm going to take a guess and say that those are delrin or some type of nylon gears.
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Unread 01-31-2005, 12:40 PM
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Re: pic: 1382 Brazil - Gear box

Its a nice sleek design...
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Unread 01-31-2005, 12:41 PM
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Re: pic: 1382 Brazil - Gear box

great job with the gearboxes and especially with the polycarbonate covers. I think its a great idea when a team has covers on their gearboxes, it keeps foreign debris out and it keeps damaged parts and grease contained within the robot.
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Unread 01-31-2005, 02:44 PM
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Re: pic: 1382 Brazil - Gear box

Very Nice, your machine work looks great!!
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Unread 01-31-2005, 02:59 PM
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Re: pic: 1382 Brazil - Gear box

Looks very robust. Almost too robust...what does that thing weigh?

At least I know of a team that shouldn't be having any drive train failures at competition!
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Unread 01-31-2005, 06:17 PM
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Re: pic: 1382 Brazil - Gear box

Man, that is some really talented machining there. How did you get the edges so nice...

It's incredible how nice a product highschool students can turn out.
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Unread 01-31-2005, 07:00 PM
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Re: pic: 1382 Brazil - Gear box

I must say these look extremely professional, and quite functional. I am rather impressed. My only *constructive* criticism is that these look really weighty.


Quote:
Originally Posted by abeD
Wow those look really professional. I bet they weigh very little as well. I'm going to take a guess and say that those are delrin or some type of nylon gears.
LIGHT!!!! ARE YOU OUT OF YOUR MIND!!! Those side plates are freaking ridiculous. There seems to be a trend of this among FIRST teams. There is honestly no reason to make side plates any thicker than about an 1/8" maybie 3/16" if they are directly supporting wheels. Check out the kit gearbox, many of the team 45 gearboxes, the andymark gearboxes etc. Last year our gearboxes were made from 3/16" plate and looking back even that was overkill.

One question: It would appear as if this is a two-speed box. How does the shifting mechanism work and is it plastic?
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Unread 01-31-2005, 08:22 PM
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Re: pic: 1382 Brazil - Gear box

Quote:
Originally Posted by Rickertsen2
LIGHT!!!! ARE YOU OUT OF YOUR MIND!!! Those side plates are freaking ridiculous. There seems to be a trend of this among FIRST teams. There is honestly no reason to make side plates any thicker than about an 1/8" maybie 3/16" if they are directly supporting wheels. Check out the kit gearbox, many of the team 45 gearboxes, the andymark gearboxes etc. Last year our gearboxes were made from 3/16" plate and looking back even that was overkill.
Granted, they're not going to be light if they're 3/8" thick. But there is more to selecting a plate thickness for a gearbox than simply choosing 1/8". Material selection is the biggest factor, because the range of properties between (for example) 1/8" aluminum sheet metal and 1/8" alloy steel plate is enormous. Furthermore, what is it supporting--is it structural? If so, what about the rest of the frame? Some robots employ non-structural gearboxes, others tie them into the chassis as integral stiffening members. You can't compare these equivalently.

Incidentally, I am personally a little bit curious and concerned as to the durability of those plastic gears. Without knowing the ratios, and the shifter design (if indeed, that's what that is), I can't say for sure--but I would definitely suggest looking for metal equivalents, just in case you run into problems during testing. (Run the hell out of it!) Maybe someone could enlighten us a little bit about that?
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Unread 01-31-2005, 08:50 PM
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Re: pic: 1382 Brazil - Gear box

I, too am a little concerned about the plastic gears. The first stage may be alright, but the output gear seems a bit undersized. If you give me your ratios, gear face widths, gear diameters, and gear material I will run some quick numbers for you.
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Unread 02-01-2005, 02:15 AM
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Re: pic: 1382 Brazil - Gear box

The machining is nice quality, but for everyone who is "amazed" I'd just like to say that it is typical of any professional machining. What amazes me is the lack of scratches. They aren't anywhere to be found! The plates have not been milled and they have not been buffed, or even gone over with a scotch bright pad. How do you keep the plates from getting scratched in their raw material form?

Last, for anyone who says this is heavy, how can you call plastic gears heavy. Most teams (like 696) would use all steel gears. So I personally think this is very light, but I do have some concerns about that final stage.

As a side note the world would be a happier place without scratches of any kind
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Unread 02-01-2005, 08:09 AM
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Re: I <3 enclosed gearboxes

Quote:
Originally Posted by RogerR
sweet looking gearbox...will there be any more pictures coming our way?
what are those gears made of?
The mech guys really made a nice job in that project.

The gears are made of "polytechmil" (please, help me: I don't know the exact word in English...).
Soon we'll post new pics!
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Unread 02-01-2005, 09:45 AM
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Re: pic: 1382 Brazil - Gear box

Quote:
Originally Posted by dez250
great job with the gearboxes and especially with the polycarbonate covers. I think its a great idea when a team has covers on their gearboxes, it keeps foreign debris out and it keeps damaged parts and grease contained within the robot.
Correct, the covers were a terrific addition...we used LEXAN , a sort of polycarbonate material that is one of the most widely known "plastics". (actually, I don't work with mechanics, so I just barely learned what Lexan was a few days ago...long story... It's amazing the variety of things FIRST teaches us!!!)...anyway, they're very lightweight...I'll try to post how much they weigh exactly, but unfortunately the only scale available in our room isn't working . also....affirmative: it's a dual-speed gear box.

Feel free to ask any other questions you may have....or visit our Forum at www.tribotecteam.com ...there are students there far more knowledgeable than me when it comes to mechanics...I'm just the "person-that-posts-pictures-of-our-creations-on-chiefdelphi" ...
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Unread 02-01-2005, 11:57 AM
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Re: I <3 enclosed gearboxes

Quote:
Originally Posted by Zanella BR
The gears are made of "polytechmil" (please, help me: I don't know the exact word in English...).
I couldn't find any reference to that material--does it have any other trade names, or do you know the proper scientific/engineering name? (Even in Portuguese!)

For instance, we can get Delrin gears here, but that's just a trade name for a polyacetal thermoplastic, also known as polyoxymethylene (POM).

We'd be able to give you a better idea of the durability of the gears (that is, if you need it), if you could pick the material from one of the lists on eFunda's polymer page or on MatWeb.

The fact that it is dual-speed is nice, but it only amplifies the concerns...I'm interested to see what those other pictures reveal about the shifting mechanism itself.
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