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#1
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what's single/double keyed mean?
in regards to hubs and cranks -- Sofa - My Custom Beard 'Absolutely right, Sofa!' - General consensus on RSU ------------------------------------------------------------------------ Sofa's Profile: http://www.unicyclist.com/profile/706 View this thread: http://www.unicyclist.com/thread/27300 |
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#2
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what's single/double keyed mean?
ubersquish wrote: *so single-keyed would mean one key, and double-keyed would mean two keys, presumably on opposite sides of the axle * Yup. Here's a page that shows a picture of a keyway. http://www.robot-village.com/husky8.html Check out pictures #13 and #14. Picture #14 shows the long rectangular key. Now just imagine that it's a Profile pedal spindle and a Profile hub body and you've got the idea. A google image search on "keyway" will find more pictures of keyways. -- john_childs - Guinness Mojo john_childs (at) hotmail (dot) com ------------------------------------------------------------------------ john_childs's Profile: http://www.unicyclist.com/profile/449 View this thread: http://www.unicyclist.com/thread/27300 |
#3
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what's single/double keyed mean?
thank ye kindly -- Sofa - My Custom Beard 'Absolutely right, Sofa!' - General consensus on RSU ------------------------------------------------------------------------ Sofa's Profile: http://www.unicyclist.com/profile/706 View this thread: http://www.unicyclist.com/thread/27300 |
#4
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what's single/double keyed mean?
Finally, a question on this list that I can answer! The reason you typically don't have more than one or two keyways is simply the cost of cutting the keyways. The key transmits the torque to the axle and if a key is not strong enough, the cheapest solution is to just use a larger key (still only one keyway to machine). Why two keyways, then? That's a good one, probably you can have a smaller diameter axle overall (less weight) if you cut two small keyways instead of one big one. There's always a tradeoff somewhere. Definitely a loose key is a disaster waiting to happen, not only is it going to fail *soon* but it is also probably damaging the keyway on both pieces. Generally keys are made of a different hardness material to prevent wear or "galling" of the keyway. *Digression* In some machinery a similar part called a "shear pin" is used between two components for the specific purpose of cutting in two if too much torque is applied. So if you want to really limit the size of the hill you can attempt.... Phil -- schroder - Occaisional Unicycler ------------------------------------------------------------------------ schroder's Profile: http://www.unicyclist.com/profile/4234 View this thread: http://www.unicyclist.com/thread/27300 |
#5
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what's single/double keyed mean?
But how can it cost so much more if you're already going to cut one? Wouldn't it be worth it for more strength and less weight (as you said)? Keep in mind that I obviously don't know what I'm talking about. Andrew -- andrew_carter - www.unicycles.com.au! HTTP://WWW.UNICYCLIST.COM/GALLERY/ANDREW andrew_carter (at) mail (dot) com http://www.unicycles.com.au - Opening soon! ------------------------------------------------------------------------ andrew_carter's Profile: http://www.unicyclist.com/profile/1052 View this thread: http://www.unicyclist.com/thread/27300 |
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