There have been many posting on various papers that give info on end disk and shell stress analysis and material selections.

You have not stated the complexity on you pulley system in terms of belt forces, width, bearing centers, et al. Therefore, we cannot assume the pulley is trivial and can be selected from stock published sizes like Mechanical Power Transmission Association (MPTA). They have already tabled a wide selection of designs with shafts to 200mm or larger and belt widths to 1600 mm or larger, and drum diameters to 1200mm. I take these from memory. If your design exceeds these values, I strongly suggest you obtain an expert.

It is not trivial. You must be mathematically competant. Obtain the papers and see. One excellent paper was published by CDI in BSH:

"A New Pulley Stress Analysis Method Based on Modified Transfer Matrix" Qiu & Sethi, Vol 13, Number 4, November, 1993. ■

Dear Sir,

Rim thickness can be calculated by this way.

t= SQ. root of 6xzb/F, mm

Zb= BM/fb

fb= 100N/sq. mm

BM= Fn X F/8

Fn= 2T Sinthita/2,

T= T1+T2/2, N

Regards.

A.Banerjee ■

Dear Mr. Witt,

It is very difficult to type. I am sorry for this. But it is not angle of wrap. It is the length of the segment of rim which distorts. Normally it should be 20 deg.(Max.). So you can take SIN 10deg.

Regards.

A.Banerjee ■

Dear Banerjee,

My read of your thread is not clear.

If you are claiming a 20 degree wrap produces the maximum combined shell stress, you are incorrect.

The maximum varies. Often it is on the order of 50 degrees. This assumes you know how to evaluate hoop/tangential, bending, torsion, and combined shear and Von Mises stress and their allowances.

Trying to reduce these to elementary values should only be attempted at fairly small scale tensions, shaft diameters (<200mm) and plate thicknesses for shell and end disk. Shells less than 25mm (<1 inch), end disks less than 50mm (< 2 inch). Even here there are issues with weldment methods, metal surface finish and allowable stress levels.

Are you attempting to dictate a design to a fabricator? ■

Respected Mr. Nordell,

You are correct, Sir. 20 deg. is the maximum segmental area involved. I will edit the same.

Regards.

A.Banerjee ■

[QUOTE]Originally posted by A.Banerjee

[B]Dear Sir,

Rim thickness can be calculated by this way.

t= SQ. root of 6xzb/F, mm

Dear Sir,

Can you specify what is x, z, b.

Regards

Shrinivas ■

Dear Mr. Srinivas,

x = Multiplication symbol

Zb = Section modulas

In any book it is defined very clearly.

Regards.

A.Banerjee ■

Dear Sir(s)

Does anyone know :

1. Where i can find the English version of DIN743 (Shafts and Axle calculations), and

2. The name for the British Standard for fatigue analysis if it exist.

Thanks in advance

Mpho ■