I have low income and back problems. I am making a recumbent bike. what is the easiest way to set up wheels?

I tried CAD' ing on the pc the use of ordinery rear wheels bolted on a threaded shaft with one side driven by the drive chain but that will cause steering problems when I power on. As I say I am strapped for cash and miss cycling but must have three wheels and seats (Back problems) for me and my wife (tandem). any home made ideas very welcome!

I agree, it is VERY difficult to come up with a home made 'diff'. Stripping something off a lightweight quad - well it'll be as heavy as the rest of the machine!!

Most, if not all commercial trikes drive only ONE rear wheel.

You COULD set up a duel drive going to two separate freewheel systems, but would mean a fair bit of extra chain, brackets & cogs! ie. a mid-section to split the primary drive, then a sturdy secondary section to split & extend the drive out to the derallier / freehubs at the wheels.

Could be fun to build!! It'd certainly be unique.

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Threaded Shaft Article

The Ball Screw and the Ball Screw Shaft

A ball screw is a mechanical device for translating rotational motion to linear motion with little friction. They are huger when compared to conventional leadscrews because they need to have a mechanism to re-circulate the balls.

They can be used in many applications, especially in the places which need high precision. For example, they are usually applied in the aircraft and missiles to move control surfaces. Besides, they can also be used in machine tools, robots and some precision assembly equipments. Ball screws can be back-driven because of their low internal friction which requires high mechanical efficiency when compared to alternatives. Typically, ball screws may be 90 percent efficient.

It is very necessary to take care of ball screws so as to maintain the inherent accuracy and ensure long life. In order to achieve this goal, dirty things and abrasive particles should be avoided which can be gained through using a positive pressure of filtered air when they are used in a semi-sealed or open enclosure or using rubber or leather bellows to completely or partially enclose the working surfaces.

As for the ball screw assembly, it consists of a screw and a nut, each with matching helical grooves, and balls. When the nut or screw is rotating, the balls will roll between the grooves that between the nut and the screw. The ball nut determines the load and life of the ball screw assembly. It is manufactured with two types of return systems. One is the external ball return system in which the ball is returned to the opposite end of the nut through a ball return tube which outstretches above the outside diameter of the ball nut. The ratio of the number of threads in the ball nut circuit to the number of threads on the ball screw determines how much sooner the ball nut will wear out.

Since we have seen something about the ball screw , I think it is rather necessary to talk about the ball screw shafts. They are fitted by rolling, yielding a less precise, but inexpensive and mechanically efficient product. The 1st precise screwshafts were produced by starting with a low precision screwshaft, and then lapping the shaft with several spring-loaded nut laps. After that, the very repeatable shaft's pitch is measured against a distance standard.

All in all, the ball screw is a high-efficiency feed screw. Compared with a conventional sliding screw, this product has drive torque of one-third or less, making it most suitable for saving drive motor power.

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