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Unread 02-07-2006, 15:56
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pic: Crabstyle

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Unread 02-07-2006, 15:57
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Re: pic: Crabstyle

Is the entire module made from one large piece of tubing?

Nice work.
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Unread 02-07-2006, 16:12
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Re: pic: Crabstyle

Yeh. Its 3x3 aluminum square with a 1/8" wall thickness. The two horizontal plates will be welded on there.
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Unread 03-07-2006, 13:22
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Re: pic: Crabstyle

Quote:
Originally Posted by Joe_Widen
Yeh. Its 3x3 aluminum square with a 1/8" wall thickness. The two horizontal plates will be welded on there.
Question: if those two horizontal pieces will be welded on, then how do you get the shaft for the wheel into the module.
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Unread 03-07-2006, 13:35
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Re: pic: Crabstyle

Quote:
Originally Posted by Joe_Widen
Yeh. Its 3x3 aluminum square with a 1/8" wall thickness. The two horizontal plates will be welded on there.
Nice design, it looks hella cool. lol-I still have the nor-cal in me

Hmm..I think standoffs to hold the plates together would make it easier to work with and maintain instead of welding it to make a box. Although, you may have to increase the wall thickness to say, 3/16" or maybe 1/4" just for safety.

I'm wondering, what do you have it geared at? What is the pitch of the gears, and the first stage of reduction?
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Unread 03-07-2006, 17:03
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Re: pic: Crabstyle

"Question: if those two horizontal pieces will be welded on, then how do you get the shaft for the wheel into the module."

Thats a good question. I didnt think of that. I can always attach the bottom plate with L pieces and screws.

"I'm wondering, what do you have it geared at? What is the pitch of the gears, and the first stage of reduction?"

They are 20 pitch gears. Its a 10-1 total reduction. The first stage is 5-1 and the second is 2-1.
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Unread 03-07-2006, 17:45
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Re: pic: Crabstyle

Quote:
Originally Posted by Joe_Widen
They are 20 pitch gears. Its a 10-1 total reduction. The first stage is 5-1 and the second is 2-1.
With only one CIM per module, you should be able to get away with 24 or even possibly 32 DP gears, significantly lightening the module.
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Unread 03-07-2006, 18:18
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Re: pic: Crabstyle

Well its 3/8" face width and as of right now I have and extra 1/10 of an inch on either side of the second stage reduction between the first gear and cim. Heres what the inside looks like. O yeh, I dont know how I'm doing the shafts so I made it simple for now.

PS, I'm not exactly sure how to check the mass on Inventor 11.
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Unread 03-07-2006, 19:26
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Re: pic: Crabstyle

For weight, go File>iProperties then to the "Physical" tab and click on a requested accuracy from the dropdown menu. Make sure the materials are set on all your parts (same menu/tab). It has been pretty much the same since at least Inventor 5.
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Unread 03-07-2006, 19:54
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Re: pic: Crabstyle

Like, Cory said, I think 20 pitch for the first stage is a bit overkill, and you might be able to get away with using 24 pitch.

I'm not sure what type of bearings you are using, but you can't go wrong with flanged bearings.

Did you add any space between the gears in the C-C distance? A 0.001 or 0.002 wouldn't hurt.
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Unread 03-07-2006, 23:06
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Re: pic: Crabstyle

Quote:
Originally Posted by sanddrag
For weight, go File>iProperties then to the "Physical" tab and click on a requested accuracy from the dropdown menu. Make sure the materials are set on all your parts (same menu/tab). It has been pretty much the same since at least Inventor 5.
This is really the first time I've ever made anything in Inventor. The weight of the whole module gears included is "2.962E+000 lbmass" according to inventor in "Very High" Accuracy


Quote:
Originally Posted by Stonefan5271138
Like, Cory said, I think 20 pitch for the first stage is a bit overkill, and you might be able to get away with using 24 pitch.

I'm not sure what type of bearings you are using, but you can't go wrong with flanged bearings.

Did you add any space between the gears in the C-C distance? A 0.001 or 0.002 wouldn't hurt.
Well, since the gears cant get any smaller, I dont know of any advantages of using 32 pitch or 24 pitch since the gears cant be any smaller (I'm using 3/8" face width).

I love flanged bearings too, adn yes I'm using them

I dont have extra space right now, but there will be in the final version.
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Unread 04-07-2006, 00:30
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Re: pic: Crabstyle

Quote:
Originally Posted by Joe_Widen
Well, since the gears cant get any smaller, I dont know of any advantages of using 32 pitch or 24 pitch since the gears cant be any smaller (I'm using 3/8" face width).
Oh, so the distances for clearances with 20 pitch is good and if you were to design with a smaller gear for pitch such as 24 or 32, some things would interfere?
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Unread 04-07-2006, 00:40
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Re: pic: Crabstyle

Yeh, exactly.
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