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Author: Subject: Calculate taper ratio??
McLannahan

posted on 19/2/08 at 12:39 PM Reply With Quote
Calculate taper ratio??

Afternoon all - Asking this on behalf of someone else, so please excuse my ignorance but...

How do you calculate taper ratio?

I've "Googled" it and not come up with much!!

Thanks all

[Edited on 19/2/08 by McLannahan]





My girlfriend said she was leaving me due to my obsession with the 60's group The Monkees.


I thought she was joking ........ And then I saw her face......

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mcerd1

posted on 19/2/08 at 12:49 PM Reply With Quote
What info have you got ?

and what form do you want the answer in ?

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McLannahan

posted on 19/2/08 at 12:53 PM Reply With Quote
Thanks Mcerd - I'll check and post back!





My girlfriend said she was leaving me due to my obsession with the 60's group The Monkees.


I thought she was joking ........ And then I saw her face......

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McLannahan

posted on 19/2/08 at 12:56 PM Reply With Quote
Not that this means much to me but....

"It's a taper reamer that's 117mm long and 27mm thick at top. 10mm thick at the bottom"

and to add...

The form - I'd like to know whether it was a 1in8 or a 1in6 etc.. Dimensions may be slightly out!


Does that help?

Many thanks!

[Edited on 19/2/08 by McLannahan]





My girlfriend said she was leaving me due to my obsession with the 60's group The Monkees.


I thought she was joking ........ And then I saw her face......

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smart51

posted on 19/2/08 at 01:01 PM Reply With Quote
the difference in radius is 8.5 over a length of 117mm. Thats 1 in 13.76 or 4.155 per side, 8.31 included angle or 1 in 6.88 (both sides)

Edit to say that ball joint tapers are usually 1 in 6 ( or 2" per foot) 1 in 8 (1.5" per foot) or an included angle like 10.

[Edited on 19-2-2008 by smart51]

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McLannahan

posted on 19/2/08 at 01:05 PM Reply With Quote
Thanks Smart, I'll pass that on!

How is it actually worked out?





My girlfriend said she was leaving me due to my obsession with the 60's group The Monkees.


I thought she was joking ........ And then I saw her face......

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02GF74

posted on 19/2/08 at 01:44 PM Reply With Quote
one number subtracted from antother, then divided by another.

e.g.
major radius minus minor radius divided by distance between them.





An imitation from New York
you're made in Japan
from cheese and chalk


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McLannahan

posted on 19/2/08 at 01:52 PM Reply With Quote
Thanks 02GF74 - That makes sense!






My girlfriend said she was leaving me due to my obsession with the 60's group The Monkees.


I thought she was joking ........ And then I saw her face......

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mcerd1

posted on 19/2/08 at 01:53 PM Reply With Quote


A = (D2 - D1)/2

ratio = A / B (or A in B )



in this case:

(27-10) /2 = 8.5

ratio = 8.5 in 117

divide both sides by 8.5 = 1 in 13.76

for the angle between the tapper and the central axis you've got a right angle triangle with:

the side opposite the angle 8.5
and the side adjacent to the angle is 117

so angle = Tan-1 (8.5 / 117) = 4.15

and the included angle (ie from one side of the tapper to the other) is twice that = 8.31

[edit]
damm, too slow...

[Edited on 19/2/08 by mcerd1]

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McLannahan

posted on 19/2/08 at 01:55 PM Reply With Quote
Fantastic - Thanks guys!





My girlfriend said she was leaving me due to my obsession with the 60's group The Monkees.


I thought she was joking ........ And then I saw her face......

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mcerd1

posted on 19/2/08 at 02:13 PM Reply With Quote
those sizes could be imperial

at a guess:
10mm = 3/8"
27mm = 1 1/16"
117mm = 4 5/8"

giving 11/32 in 4 5/8

=> 1 in 13 7/16 or 1 in 13.45

=> 4.25 = 8.5 included angle

[Edited on 19/2/08 by mcerd1]

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McLannahan

posted on 19/2/08 at 02:28 PM Reply With Quote
The plot thickens!

I'll double check!





My girlfriend said she was leaving me due to my obsession with the 60's group The Monkees.


I thought she was joking ........ And then I saw her face......

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mcerd1

posted on 19/2/08 at 03:20 PM Reply With Quote
the difference between 8.31 and 8.5 is only due to rounding errors from imperial to metric

and my figures are only a guess, (using your metric measurements to guess at a likely imperial size)
but it does appear to give a half sensable answer - but I could round them another way and get 8 or 9

the only way to be sure is measure it accuratly (imperial or metric - doesn't matter)

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DarrenW

posted on 19/2/08 at 03:23 PM Reply With Quote
Ive checked the Zeus book and it doesnt fit a std Morse Taper.






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McLannahan

posted on 19/2/08 at 03:33 PM Reply With Quote
Thanks so much for all your help guys!

I wish I could begin to understand it!

It's a good thing I've never built a KC...It'd probably resemble a trebuchet!







My girlfriend said she was leaving me due to my obsession with the 60's group The Monkees.


I thought she was joking ........ And then I saw her face......

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