 WOT: mechanical engineering question |
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| TonyAKAVW |
 Oct 14 2004, 05:40 PM
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That's my ride.  Group: Members Posts: 2,151 Joined: 17-January 03 From: Redondo Beach, CA Member No.: 166 Region Association: None  |
I'm building a "roto-lok" system http://www.roto-lok.com/tech/technology.html
for the rotation of an antenna for amateur (ham) radio purposes. I'm trying to find an equation that relates the radius of a pulley/drum to the total friction. Basically I want to make sure that I put sufficient turns of wire around the drive shaft so that it does not slip. I've been searching on the web and I can't even really find equations relating tension to friction, etc. Any advice on where to look? -Tony |
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| TimT |
Oct 14 2004, 06:12 PM
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retired Group: Members Posts: 4,033 Joined: 18-February 03 From: Wantagh, NY Member No.: 313 |
Lots of variables in this one
tension on the tail end of cable dia of cable total length of cable bearing coefficient of friction of the surface of the capstan coefficient of friction the cable speed in radians the capstan is turning... Or as John mentions make a guess and try.. sometimes its easier to try and see what happens than calculate When I worked on charte boats we anchored in about 100' of water usually a 100lb anchor, two turns on the capstan and the hook came up. friction (mu) is either added or subtracted from equations..... You need to pursue equations involving rotation in a shaft.. torsion equations.. j=(pi*d^4)/32 etc just have to introduce slippage into that.. |
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Posts in this topic
TonyAKAVW WOT: mechanical engineering question Oct 14 2004, 05:40 PM
john rogers If I remember my naval engineering correctly about... Oct 14 2004, 05:55 PM TonyAKAVW Well, lets say there is one turn on the large drum... Oct 14 2004, 06:07 PM TonyAKAVW Thanks! I'll do some searching with those... Oct 14 2004, 06:18 PM Carl Other approaches would be to use a chain & sprocke... Oct 14 2004, 06:26 PM MattR ugh, i just signed on to take a break from my stat... Oct 14 2004, 06:50 PM TonyAKAVW Actually this is for adjusting the elevation angle... Oct 14 2004, 07:17 PM F4i You could use coged belts. Like the kind used for ... Oct 14 2004, 09:06 PM groot Is this for home use? If so, I think I'd make ... Oct 15 2004, 06:03 AM
TonyAKAVW Its sort of for home use. Its more for mountainto... Oct 15 2004, 12:30 PM |
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