Gallery, Projects and General > How do I??
weird results with a sine bar.
Jasonb:
I think its your maths
Working it out for the 0.407" stack I get 4.669 which is near as dam it your 4.7actual
0.407 / 5 = 0.0814.
sin 0.0814 = 4.669
For the 1.509 stack I get 17.566 again closer to your 17.6 actual than your 16.9 theory.
1.509 / 5 = 0.3018
sin 0.3018 = 17.56574
What are you using to "check" the angle
Just twigged you are using tan not sine there is a clue in the name of the bar :doh:
J
mklotz:
--- Quote from: Jasonb on December 05, 2013, 03:36:29 PM ---I think its your maths
...
sin 0.0814 = 4.669
...
sin 0.3018 = 17.56574
--- End quote ---
Don't add to the confusion. You should have written:
arcsin (0.0814) = 4.669
arcsin (0.3018) = 17.56574
wheeltapper:
I thought I was using the wrong formula.
I said I was no good at maths.
Oh well , back to the drawing board, I'll just get my coat.
cheers
Roy.
Edit
I just figured my mistake, thanks guys I know were I went wrong now.
mklotz:
--- Quote from: wheeltapper on December 05, 2013, 04:37:28 PM ---I thought I was using the wrong formula.
I said I was no good at maths.
--- End quote ---
Here are the pertinent formulae:
Let:
h = stack height
L = sine bar length (distance between roll centers)
A = angle
then:
sin(A) = h/L
h = L * sin(A)
A = arcsin(h/L)
wheeltapper:
cheers for that.
Roy.
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