[HBR] Progess report and 50:1 drive idea

[Hopperdhh at aol.com]

In a message dated 4/25/2006 8:02:06 A.M. Eastern Daylight Time,  
dkelly42 at cox.net writes:


"Does anyone have experience with string drives at  ~50:1?   What about a
5:1 
ball drive and a 10:1 string  drive?"





The Drake 2-B uses a 4.5 inch drum driven by a (stainless?) steel shaft  that 
is necked down to about 0.1 inches.  There are a little over 1.5  turns of 
string around the small shaft.  It also drives a conventional 7  inch slide rule 
dial with a separate dial string off the top of the drum  through 2 pulleys 
at each end of the dial.  This drive works very smooth  (very little friction) 
and is cheap and simple.
 
Dan Hopper
K9WEK