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Unread 30-12-2006, 03:41
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Madison Madison is offline
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Re: pic: Drivetrain Side View

Quote:
Originally Posted by AustinSchuh View Post
Did I use the PEM nuts correctly? Our machinist recomended PEM nuts instead of threading metal, but since I have never used them before, I don't know if I used them correctly.
Also, I sent the design to our machinist for inspection, and he thought that I needed to strengthen the transmission case by making it more of a box. Is his concern valid?
(PEM nuts are cool parts that are pressed into a special sized hole in a piece of metal and presto, the hole now has threads. http://www.pemnut.com/)
The captive nuts looked fine to me; just make sure the ones you use are sized properly for the sheet metal thickness.

I think your transmission will be fine as long as it has the spacers across the top, though I was curious why you decided to use sheet metal spacers instead of simple tube. It may be heavier to have a bolt run through tubing, but it'd also be a lot easier and might alleviate some of the sheet metal production time.

Did your machinist express any concern about the bearing holes lining up from one side the the next? The limited experience I've had with sheet metal parts makes me concerned that you may not get bends that are accurate enough to keep the shafts orthogonal to the plating -- especially if you're bending something as thick as 1/4" plate.
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Last edited by Madison : 30-12-2006 at 16:06.
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