On Sat, 17 Nov 2012 19:49:37 -0600, Vic Smith wrote:
Thanks for the pointer.
That DDM 1-spring-to-2-springs page is fantastic.
I had opted for one spring with a very high duty cycle;
but, in hindsight, I SHOULD have opted for the more
balanced set of two springs (which wouldn't even have
cost any more).
It turns out that the one spring is twisting my
bearing plate off the wall!
Two springs would not have twisted the plate because they
would cancel each other out. Sigh.
Lesson learned (too late) after the fact!
Nah, the same amount of force is distributed across the torsion bar.
That's why I told you to prepare to re-lag the bearing plate instead of
going back in the same holes @ the same angle. If you angle the lags in
to get more 'bite' in the header, it will hold better.
On Mon, 19 Nov 2012 12:51:20 -0600, G. Morgan wrote:
I think you're right. A garage door isn't so simple anymore.
Dan at DDM Garage Doors says my real problem is that
the cable drum ends do not have the end bearing plate
securely fixed. He's gonna send me some angle iron
and 7/16ths head 3-inch lag screws to secure the sides.
He says the middle can't move unless the sides let it
move. I'm still trying to understand that - as it's not
intuitive at all to me that the ends are what is making
the middle bend.
Here is a picture of the gap on one end:
And, here's a picture of the gap on the other end:
Unfortunately, there is NO STUD beneath those ends!
You would love it when I go to replace a door and how I 'unwind' the old
springs. I just stick a winding bar in there and lift it a couple of
inches to let it rest on the door. Then I loosen the locking bolts, get
down from the ladder and put vise-grips on the winding bar - shake back
and fourth a couple of times and yank it out! Makes a hell of a racket,
but it's easier than unwinding it by hand.
On Mon, 19 Nov 2012 12:47:50 -0600, G. Morgan wrote:
I just tried that with the last quarter turn of
unwinding. I simply pulled the bar away - and it
spun back to the zero turn level on its own.
It was undramatic - but - of course, that was only the
last quarter turn.
I can see that it would work though - but it's just
as easy to unwind it 30 quarter turns, IMHO.
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