How much stronger Stainless Steel over mild steel

[stormbird]

Hi all

So I have a M15 shaft some where between 35 cm and 45cm long. Off centre will be a cassette mount , there will be 2 bearings and then a wheel at each end. The total load it has to carry is approx 90 kg.

Will M/S be strong enough ?
How much stronger would SS be ?

Paul

 

[undertoad]

I think it kind of depends -
Base mild steel likely won't be as strong as stainless, but if what you have is some kind of grade meant for shaft use,
then it's probably alloyed and / or has a higher carbon content, which will make it stronger than SS, and maybe easier to machine...Maybe.
OTOH, an M15 shaft of either is probably strong enough.

 

[maddox]

Stainless steel, almost as many types as non stainless steel, each with own capacities.

The only advantage "normal" stainless steel has over steel, is the rust-avoiding capacity.
The big disadvantage . Galling.

 

[stormbird]

Sorry couldn't post a picture from laptop :-

Like this

Paul

 

[undertoad]

So, the overhang is 6"or so?

Here is math and theory to determine deflection, but it's way past my pay grade, so I couldn't begin to tell you if it would help:

Shaft Deflections - Roy Mech

roymech.org

Here is a calculator, but you must input the properties (modulus of elasticity) of the steel in question:

Shaft Deflection Calculator - Calculator Academy

Shaft Deflection Calculator Basic Calculator Advanced Calculator Deflection (D) Applied Force (F) Length of Shaft (L) Modulus of Elasticity (E) Moment of

calculator.academy

Are you excited yet ?