Garage door opener question

[mysticalflight]

I am looking at installing garage door openers on my shop doors. I am wanting to an side offset opener up. Something like the Liftmaster 8500. I was looking around and seen where people have taken a conventional opener, made brackets, and attached a sprocket to the door spring shaft. I am leaning towards this route. Instead of spending over a 1000K on openers I could spend a third that. My question is what number of teeth for the sprocket on the spring shaft?

 

[jstroede]

If it were that easy, Liftmaster would sell it that way.

I do not recommend. Period.

/thread

 

[MAINEGUY]

If it were that easy, Liftmaster would sell it that way.

I do not recommend. Period.

/thread

I just bought and installed three Liftmaster 8500's in my garage. The openers were about $269 a piece delivered from http://weshipgaragedoorparts.com. Pretty simple install too.

Looks like liftmaster does make some kind of kit like you're talking about for the Wayne Dalton Torquemaster shaft.

Eric

 

[Hot Rod Grampa]

The 8500 has one important feature a trolley opener does not and that is the cable tension sensor. If it detects a moment where the cable is too slack it instantly reverses itself, preventing cables coming off the drums. It also has an electric deadbolt that locks the door. Without that deadbolt anyone could lift the door from the outside. You can do it your way but the difference in openers is about $100.00 each. Cheap insurance in my mind. Just thinking out loud.

 

[kbs2244]

It has been done more that once.

 

[rburke65]

Be sure to pist plenty of pictures of you opener

 

[BucksCtyMike]

The 8500 has one important feature a trolley opener does not and that is the cable tension sensor. If it detects a moment where the cable is too slack it instantly reverses itself, preventing cables coming off the drums. It also has an electric deadbolt that locks the door. Without that deadbolt anyone could lift the door from the outside. You can do it your way but the difference in openers is about $100.00 each. Cheap insurance in my mind. Just thinking out loud.

Just to be clear, you can not manually open an 8500 door without pulling the emergency release cable first. Deadbolt open or closed.


Sent from my iPad using Tapatalk

 

[Hot Rod Grampa]

Have to disagree. Opener is only keeping shaft from turning. If it is a light door you can pick it up without the spring assist. Door will be heavy but it is not secure. Cables will come off drums. Has been done before. Imagine removing springs cables and shaft. Door will open. Nothing to prevent it. Just thinking out loud.

 

[MikeF]

Most residential doors only weigh a couple hundred pounds tops. Obviously the fancier wood ones are heavier than the builder grade stuff. Very easy to lift with no spring or opener

 

[like2wheel]

Just had to weigh an 8 x8 insulated door. Was 124 lbs.

Did somebody say that the Liftmaster comes with a deadbolt?

 

[HotrodHR]

Just had to weigh an 8 x8 insulated door. Was 124 lbs.

Did somebody say that the Liftmaster comes with a deadbolt?

Yes... automatically engages when door shuts...

 

[MikeF]

Double check though. I had a guy get one online and it was just the operator. No remotes, keypad or dead bolt. Had another guy get one and his dead bolt was wired backwards from the factory, just flipped the wires and all was right.