Physics Guru needed

[Ross77]

Since I've just had my structural analysis exam today I had vowed not to do any more calcs for at least a week........:nope:

So use this site http://www.engineeringtoolbox.com/be...on-d_1312.html

use the metric option Beam Supported at Both Ends, Load at Center

q= load = mass x gravity (25kg x 9.81= 245.25N) add the weight of the carrige as well
l = length in mm
I= moment of inertia = pi times r^4/4 = 19174.76 mm^4 (for a circle)
E= modulus of elasticity (find out from supplieror or use 200000 N/mm^2 for steel )
y= radius (25mm)12.5mm (thanks Irving)

This is only for a simply supported beam so will be worst case, If the supports are nice and solid then you could go for a fixed beam. I'll have to digg out the formulas and do an excel sheet for all the options.

I think most of this is correct, my brain is pretty fried at the mo tho:heehee:

Good luck

[Lee Roberts]

I'll have to digg out the formulas and do an excel sheet for all the options.

If you would Ross that would be great, i would like to add that to the site as a feature. Its also a question i get asked quite often on ebay.