# Questions tagged [shafts]

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### Calculation and selection of shafts and gears

This is a solar tracker The top weight is about 6 kg What is the minimum torque required to rotate the upper part? What shaft is needed? And the diameter of the gear?
18 views

### Gear shaft with 2 different diameters

Where can i find a gear shaft around 6 inches long thats keyed and has a half inch diameter on one half and 3/4 inch diameter on other
22 views

### In what practical use case would you choose to incorporate multilayered bearings i.e. bearing within a bearing?

Considering every aspect of engineering like durability, efficiency, cost vs service-life and all the possible mechanical issues, Is there any practical advantage in using multilayered bearings? What ...
29 views

### Shaft undergoes torsion and centrifugal stress

I use this model to get the tangential and radial stress formulas but I want to examine a system also undergoes a torsion under constant speed. I'm a little confused at this point, do I need to point ...
• 1
43 views

### How to build bench with a rocking top rectangular section?

I want to build a metal bench, maybe 2m x 50cm x 40cm(W). A bit like a weights bench. The flat top rectangular section you sit or lay on should rock maybe 30 degrees to each side. What parts would be ...
71 views

### Why aren't tricycles use cardan shafts?

All the tricycles I saw use chains. It looks far from being efficient comparing the regular bike: Notice how long the chain is. They have to use 2 chain idlers. The back path is inside the curved ...
• 101
174 views

### How to adapt a threaded drive shaft to a keyed shaft (for use with V-belt pulleys)?

I am sure there is a very simple answer to this question, but with no formal mechanical engineering education, I don't know what it is. I have a 2.5 HP, 3,450 RPM continuous duty electric motor with a ...
288 views

### How (or should I) to connect a D-shaft to a load, through a bearing?

I have a gear with a D-shaft that is intended to directly drive a turntable. Something relatively heavy at very low speeds and with not much torque, if it's important. I really don't want the gear to ...
• 121
71 views

### Are double universal (Cardan) joints exactly constant velocity?

Some double universal joints use a centering joint to ensure that the angle of the input and output are equal to maintain a constant velocity through the joint. From what I can tell, this centering ...
• 67
14 views

### 3" shaft high wear

A 3" drive shaft 27" long with keyway. Application 40 ft long mixing tank Limestone 40% mix with water RPM 60, temperature 70 °F - 200 °F Shaft supported by hard iron static bearing 1045-...
27 views

### Moment at the end of the shaft, after a bearing?

I have an application with an interchangeable load. That can be swapped in a machine. The bearing and break are both mounted to different sides of the same plate The load is placed on two shafts that ...
1 vote