Globe Motor + Lead Screw = Confusion

[Madison]

I have a simple question, really. I hope it has a simple answer.

What's the simplest, most efficient, adequate way of fixing the provided lead screw to the shaft of a globe motor.

The globe motor has a flattened shaft. Can I just put a hole and flats in the lead screw and stick it on the motor shaft?

Darn threads.

[rbayer]

The lead screw isn't that much bigger than the globe shaft, so you're probably going to need some kind of coupling so it doesn't break through. I'd recommend removing the threads from the last inch or so and getting a decent coupling kit from small parts or MSC. They're fairly cheep and fairly reliable. Whatever you do, avoid set screws at all cost!

Also, be very careful to fully support the lead screw in at least two places as the globe can't take ANY side loads.

[Madison]

Originally posted by rbayer
The lead screw isn't that much bigger than the globe shaft, so you're probably going to need some kind of coupling so it doesn't break through. I'd recommend removing the threads from the last inch or so and getting a decent coupling kit from small parts or MSC. They're fairly cheep and fairly reliable. Whatever you do, avoid set screws at all cost!

Also, be very careful to fully support the lead screw in at least two places as the globe can't take ANY side loads.

That's sort of what I figured. I was just hoping someone would say, "It's okay, that'll work!" or something. They still can

Space is at a premium, so I want to keep everything as small and simple as possible. I'll shop around for shaft couplings.

[DaBruteForceGuy]

Originally posted by M. Krass
That's sort of what I figured. I was just hoping someone would say, "It's okay, that'll work!" or something. They still can

Space is at a premium, so I want to keep everything as small and simple as possible. I'll shop around for shaft couplings.

It's ok that'll work...
Now get it done!!!!
jk, actually i think that it might be easier just to go thorough the shaft.... the word kit has never appealed to me much
but neither has the word DIRECTIONS, so......

[Joel Glidden]

It definitely depends on the forces associated with your application. But for not-too-high loads you should be just fine with a coupler that puts a set-screw on the globe motor output shaft and a pin through the lead screw. We've had decent success in the past with pinning the lead screws in an aluminum coupler.

-Joel

[Jeff Waegelin]

Originally posted by rbayer
Also, be very careful to fully support the lead screw in at least two places as the globe can't take ANY side loads.

Heh. We discovered that in 2000 after burning up about 7 Globe motors on our lock for the bar-hanger. Globe + side load= magic smoke.

[Justin Stiltner]

We have had good experances with set screws on flattend shafts, we actually had this setup on a vandoor at full stall and it never came loose.
But I would get some 1/2" steel and make an coupler before I would buy one. Its really not that hard to do if you think about how its made.