Saturday, April 26, 2008

Chain lift assembly

Here is a motor mount for a DC motor. This motor mount was originally built for a helical (spiral) lift. The opening around the motor shaft is set-in to allow for the thrust bearing that is needed between the mount and the helical lift shaft. Without it, the weight of the lift and marbles would be directly on the motor. Not good. The only thing missing from this photo is the shaft that connects the motor shaft and the lift. I hadn't made any yet, and now I am glad that I did not. I needed to make a chain lift, and decided to use the DC motors because the mount was already made. So this means I needed to adapt what I had, to what I needed.

These are the extra parts needed. The square pad at the top is just to hold the roller bearing in place. The shaft fits over the motor shaft, goes through the bearing, and holds the sprocket. The allen head screws are easy to identify, also see the small aluminum 'stand-offs' that keep the bearing pad from pushing the shaft into the motor mount. And of course, the two sprockets. One is a 30 tooth, and the other is 45 tooth. Using a lathe, I turned off some of the shoulder on the big sprocket, to reduce the weight, and so the set screw hole would not have to be threaded as much.

Here is the shaft, installed first.

Next, the bearing pad fits onto the shaft.

To keep the bearing pad from crushing the shaft into the motor mount, a stand-off is used between the bearing mount and the motor mount. Once tightened it holds the weight of the sprocket against the face of the mount, while leaving room for the shaft to move around easily. The flat on the end of the shaft is for the set screw on the large sprocket. With a flat spot like that the set screw does not need to be tightened to within an inch of it's life...

The large sprocket is the drive sprocket. Here the ladder chain is draped over the top, but the motor will be at the bottom, so the chain will actually go around the bottom of the sprocket. The smaller sprocket spins loosely, so it has a bronze bearing pushed into the center. It will be kept from moving side to side once it is mounted on the 1/4" shaft that fits through the bearing.

I am very pleased to be learning to use a Lathe and Mill. Without them, this would be very difficult, if not impossible. (Thanks Bill B !!) To get the nice rounded look on the aluminum, each pieces is routed on the edge. To save time, and reduce costs, always make more than one. (I made three...)

This assembly has been installed on my next project....A 4' X 4' floor standing sculpture. 3 tracks. See it here soon!

1 comment:

Anonymous said...

Hi, which type of motor is used to rbs ? thanks