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  1. GregSmith

    Thermal expansion on a brass ring

    All linear dimensions of the ring will increase by the same percentage. delta L = L * alpha * delta T where delta L = change in linear dimension, L = original value of linear dimension (at the reference temperature), alpha = coefficient of thermal expansion, dalta T = change of temperature...
  2. GregSmith

    Hydraulic Motor torque

    Thanks Nick55 for pointing out the mistake in my derivation. Deak's formula is indeed correct.
  3. GregSmith

    blevins solution for centre pivot beam

    If the pivot is fixed, it is effectively infinitely stiff. Then the rotational natural frequency about 2 is: f = sqrt[(k1.L12^2 + k3.L23^2)/(m1.L12^2 +m3.L23^2)] /2/pi where L12 = distance from 1 to 2 L23 = distance from 2 to 3 m1 = mass at 1 m3 = mass at 3 f = frequency masses in kg...
  4. GregSmith

    Hydraulic Motor torque

    The formula is wrong (by a factor of 100) For a hydraulic, positive displacement motor or pump, torque is the same as work per radian and there are 2.pi radians in a revolution. Thus 2.pi.T = work done per rev, in joules per rev if T is in Nm. Work done by fluid/rev = P.v where P = pressure...
  5. GregSmith

    DIVIDE SPHERE WITH EQUAL TRIANGLES

    If you want to build up a sphere with equilateral triangles you can only use the tetrahedron. All the other regular solids use different face geometries. Clearly a 600mm sided triangle is not going to give a tetrahedron inscribed on a sphere of 11000mm diameter. If approximations are allowed...

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