We have LiftMaster Professional 3575 openers on two of our garage doors. They open and close the doors really fast, which is kinda fun. The problem is, the power and speed comes on all at once, which really slams the door and opener. It sounds like someone is hitting the door with a sledge.
The nice thing to do would be to add an industiral variable frequency motor starter, but obviously that's impossible on these tightly integrated units. So it looks like some kind of mechanical cushioning is the only solution.
Has anyone else done anything for this problem? I am wondering about replacing the draw bar with a short stroke shock absorber or something. Or putting linkage in with a shock in it. But I don't want to spend $1000 doing it.
Ideas?
The nice thing to do would be to add an industiral variable frequency motor starter, but obviously that's impossible on these tightly integrated units. So it looks like some kind of mechanical cushioning is the only solution.
Has anyone else done anything for this problem? I am wondering about replacing the draw bar with a short stroke shock absorber or something. Or putting linkage in with a shock in it. But I don't want to spend $1000 doing it.
Ideas?
the opposite direction that the arrow is pointing. This will stop the door a little sooner and sometimes softens the point of contact with the floor. The limit screws are inside the cover not the blue ones on the circuit board cover.