Technical & Reference Section > Tech and Restoration
New school double clamp stem build
not johndub71:
test by johndub71, on Flickr
Not the best, but you get my idea?
oldschoolace:
Cheers John :daumenhoch:
Yeah been thinking about a few mechanisms, wedges, keys etc. I'm trying to keep the design as simple as possible (i know that sound like a contradiction with an internal pinch)
The easiest option is to dog leg the pinch slot out to one side but i'm hoping 2 m8 bolts will be enough to pull up the very small amount needed to clamp the stem.
I actually managed to sheer off a stainless steel m6 bolt where the thread meets the straight section of shaft with my first attempt :shocked:
Expected the threads in the Ali to give way first... just goes to show how tough T6082 is i guess :daumenhoch:
Spen69:
I just sold that stem for £15 to Sean (Stidds) as it was for a 1" diameter bar so couldn't grip o/s 7/8" bars :'(
The control tech stem was lush and the build quality ace so I was gonna get Steve Animal to weld a plate around the bars to increase the diameter but I didn't want to fook up the bars so I flogged it and went with a retro DK in the end.
oldschoolace:
Thats a shame Spen, it does look like a quality bit on engineering :daumenhoch:
I guess you could have used a shim but its never the same really is it! :'(
not johndub71:
If your bolting from the bottom with the threads in the top part of the stem, simply machine the botton holes elongated so they can allow for the stem closing in closer at the front than behind :daumenhoch:
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