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!

Finshed with the machining

I have finally finished the drive wheel for the ring lift I am making for my next project. The drive wheel is powered by a 10 RPM AC motor. The motor is attached to a shaft that rotates a rubber and plastic wheel, which in turn rotates the large wooden ring that will lift the marbles to the top of the sculpture. The drive wheel will contact the ring at the outer edge. The base and bracket are made from aluminum. The coupling from the motor to the drive shaft is made from stainless steel. The drive wheel itself is made from rubber (center) and plastic end caps. The shaft is stainless steel also. The motor is from McMaster Carr. $45 - I have at least 40+ hrs into this assembly.

This was a very complicated process for the beginner machinist, like me. I won't bore you with the details of construction. This drive wheel will be mounted at the bottom of the frame to support and turn the wood ring lift that Gene built for me. I didn't build the wood ring because I don't work with wood, just metal. Besides the motor and thrust bearngs, everything you see here was made from scratch with a Lathe and Mill. I learned a lot! I wish I could say that I knew what I was doing and just did it, but the reality is that Bill helped me the whole way. I did do all of the work but Bill helped me with the process and what tools to use when, and why. I will probably get Bill's lathe, as he is 80 years old, but I would be much happier with a few more years of experience under him. Bill told me today that if I had to take this design to a machinist he would charge me $3000 to $4000 to complete everything you see in the photo above. Ouch. That wouldn't be a problem if your customer is going to pay for it, but how do you get a quote on something you are not sure of how to make yourself? My answer is to do it yourself. Piece by piece. To be fair I used several tools I had no idea existed, let alone how to use them. But now that I know....well...knowing is half the battle...

This is the wood ring that will lift the marbles to the top. The drive wheel runs clockwise, so this wood ring will rotate counter-clockwise. There is a small groove inside each of the holes to keep the marble from rolling out. I will need to make a mechanical lever that pushes the marbles out when they reach the top. The steel frame is made from 1/2" stainless steel square tubing ($80 per 20 ft) which is cut at 15 degrees. (30 degree total)
I bought a book "507 mechanical movements" very informative. With it I will be able to find just the right movement to get the marbles out. I will put a pin in the inside of the ring to actuate the arm that will push the marbles out, but first things first. This is the mock-up of what the frame will look like. Actually it is missing one more circle that will go to the left and intersect the other two rings, the last circle being smaller by at least half. This will give me framing to connect the two idler rollers to as well as the supports needed for the track and elements.

4 tracks total, should be very nice. Josh, the buyer, wants it to be elegant and quiet. I will have to pay special attention to the tipping arms, and anything else that makes noise.

I will post again soon as I get more done. Back to the shop!

Machining

I have been working on a new project. This new project will be a wall hanging sculpture 6' X 6'. The customer wants to have a wooden ring lift. This means I have to make a ring 6' in diameter. Well, I do not work in wood, so I am having Gene build that part of the sculpture for me. He will be using all walnut, in 3 layers, 1-1/2" thick total.

I am working on the drive wheel and idler wheels. There will be one drive wheel at the center bottom, and besides driving the ring so it rotates, the drive wheel will also bear all of the weight. The two idler wheels will be made from black plastic, and will be located at about "9pm and 3pm". I am having to construct everything from scratch. Thankfully, I have the use of machinery, and Bill who helps me use it. Bill is 80, and has a lifetime of experience with machining. He can get gruff, but it's well worth it.

I have been using the mill for the last two days, making the mount for the motor, and the mount for the shaft, bearings, and drive roller. Everything is being made from aluminum. It has been very educational to do everything myself...

It's pretty cool to see a chunk or plate of aluminum be machined into something that is not only functional, but very pretty. My goal is to have my own lathe and mill soon. Now, when I get one, I will know what the heck I am doing. At least the basics. Some of the tools we use in Bill's shop are very expensive and I would never purchase them for just one job. But they are quite handy and can save a lot of time.

Layout, layout, layout. That's the name of the game. Once you get your piece of aluminum cut to size, squared and finished, then you have to decide where all of the holes are going to go. There is the motor to mount, the coupling between the motor and drive wheel, and the drive wheel assembly. The drive wheel will be made from 1" rubber with aluminum end caps that will match the 1/4" chamfer on the rings edge, on a 3/8" shaft. A spacer block had to be made to lift the motor to match the height of the shaft on the drive wheel. Lots and lots to think about and make.

It sounded terribly complicated before we started, but once you get going, it's not very hard at all. When it's on paper it looks pretty simple. It gets complicated when everything has to be just right, and you don't want to do it twice. : )