This is wrong also! The number of quarter turns is dictated by the weight
of the door AND the caliber / length of the spring. There are several
different calibers of springs, and the lengths are infinite.

--
Steve Barker


"Coal Miner" wrote in message
...
On Sat, 03 Feb 2007 20:45:18 GMT, PaPaPeng wrote:

Finally wind the spring as tight
as you can. Then tighten the set screws, run the cable, etc. and test
the door. Any unevenness in the spring tension will be obvious.
Increase or decrease the spring tension as necessary.


You're going to get this guy hurt. You don't know what you're talking
about, and it is glaringly obvious.

Don't "wind as tight as you can"!!! He can break the spring easily
that way, or worse increase the chance of a winding bar coming out and
hurting him.

There are 28 quarter winds (4 complete spring revolutions) on a 7'
high door, you multiply door height by four to calculate the quarter
winds.

Also, don't paint the spring! The paint will cause the individual
coils to stick together, resulting in bunching and rough operation.
Besides, you can not judge tension just by looking at it.