Springs still not working after weighing door
Customer switched from trolley opener to jackshaft and we installed it, but the main issue is the springs weren’t right. heavy at the bottom and hot at the top. it was recently causing and issue with the old opener so she thought a new opener would fix it. Our guy who installed the opener and realized the springs were bad, he doesn’t carry extra springs and wasn’t really equipped to weigh the door.
So i got the ticket today, it showed a spring size to bring. .283 x 2.25 x 33.5, but they said take a scale and weight the door in case that wasn’t right. their research on that model showed it could be 500lbs.
we we got there and weighed it, holding the tension with winding bars against the top strut, and it showed 420lbs. so we cut a .283 x 2.25 x 36.4 inch length. We replaced cables, drums, end bearings, and the shaft. wound to 30 quarter turns, too heavy at bottom and slight heavy in the middle, almost balanced at the top. added a couple quarter turns to each side and still heavy at the bottom, balanced in the middle, hot at the top.
the new jackshaft even with force settings manually checked to make sure they’re at max, still won’t lift the door when down, or push it down when up. Which is confusing because it would do it when setting limits, but not work after.
The door is 18x7, 15” radius, Ideal brand with fancy overlay on the outside, about 2.5 inch thick with windows and 4 struts. However the struts are not on the bottom at all. there 1 at the top, 2 on the next section, and one on the next, section 2 from the bottom. I’m thinking 2 issues: the door is very top heavy and the SSC app figures springs based on total weight but assumes the weight is spread evenly, Or: the scale was off and since it holds the door a couple inches off the ground, it leaves the possibility that part of the top section was starting to go around the curve to the horizontal, taking some weight off.
Thoughts?