Slaters wheel sizes

JimmyB said:
So could you show me have this would work for both+40C and +40F with should work out at +40C = 104F and +40F = 4.44C

Tried it you way and could not get the correct answer.
Click to expand...
40C +40 =80 *9/5 =144 -40 =104F
40F +40 =80 *5/9 =44.444 -40 = 4.44C

Screenshot 2022-02-12 11.35.46.png
its just straight line geometry, move to origin to a point, change slope. reset origin.
I was told this method in first year high school science. Not a new method.

could also work at say boiling point :-
40C -100 =-60 *9/5 =-108 +212 =104F
the freezing point version F to C
move the red line down 32
change the slope to match the blue
reset origin by zero
F to C
move the blue line up 0
change the slope to match the red
reset origin by 32

Hope that explains it all.
 
Seems things are heating up on this thread, I hope the original topic isn't being frozen out, and we'll get back round to wheels
 
As the OP, I am delighted by the way this thread has turned out! What started as a rather bitter rant at a first-world problem has blossomed into a demonstration of reasoned argument, polite yet principled disagreement, intellectual rigour and diplomacy!
 
So Degauss has outlined exactly the algorithm that is used worldwide, but graphically.

move origin: correct for freezing point not being zero (if needed)
change slope: 9/5 multiplier, to change slope between F and C
move origin back: correct for freezing point again (if needed)

works in either direction, trick is when do you add or remove 32? (actually easy rule, but keeping it simple here)

Explained this way (which is NOT how I read the first post by DeGauss) of course, it's an algorithmic approach, the way you would write a computer program.

Greg
 
Rhinochugger said:
Sorry, lost the plot on that one - the 32 is important because degrees F have freezing point at 32. You therefore need it in the calculation and, for ease in remembering, it always goes at the Fahrenheit end of the calc :nod::nod:

In that regard, the -40 degrees (where both scales are the same) can be a bit of a hindrance to remembering the process.
Click to expand...
-40 can be a bit of a hindrance to remembering anything :mask:
 
Chris Vernell said:
-40 can be a bit of a hindrance to remembering anything :mask:
Click to expand...
-40, think I can remember that far back... 3 kids, 3 jobs (concurrent, Draughtsman, Ticket Collector, and Bus Driver), and a mortgage of less than $20,000.00. Still played with N gauge at that stage.
 
Who would have though thread drift could get so far when we started about wheel sizes. Clearly we are a knowledgable lot.
 
Not as far as you might think?

We are still talking about relative scales..
:nerd::nod::nod:
 
PhilP said:
Not as far as you might think?

We are still talking about relative scales..
:nerd::nod::nod:
Click to expand...
Talking of weighing relatives................................... :mask: :mask: :mask:
 
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