Gallery, Projects and General > How do I??
Math for machinist tapers...
mklotz:
--- Quote from: BillTodd on February 09, 2013, 10:50:11 AM ---
--- Quote ---(that is another measurement i dont understand)
--- End quote ---
It's primary use is for quick, in-the-head*, maths for navigation. Powers of 60 factor (i.e. can be divided exactly) by 2,3,4,5,6 etc. making division by those factors easy and accurate.
eg. 25° 34' 18" divided by three = 8° 31' 29"
--- End quote ---
Easy, yes, except
(25° 34' 18")/3 = 8° 31' 26"
BillTodd:
:doh:
(You know why ? - I was going to divide it by two then thought "no, I 'll be clever and divide by three" ...)
Where's the kicking-oneself-up-the-arse emoticon ?
Bill (:LOL:)
mklotz:
Murphy's extended law says that, if one is to make a computational error, it will always be in a widely viewed public venue. (It's a corollary of the buttered toast lemma.)
Knowing this, I check every computation in a forum response three ways to Sunday yet I still manage to bugger up a few. It's the math gods' way of keeping us humble.
dsquire:
--- Quote from: BillTodd on February 09, 2013, 12:56:44 PM --- :doh:
(You know why ? - I was going to divide it by two then thought "no, I 'll be clever and divide by three" ...)
Where's the kicking-oneself-up-the-arse emoticon ?
Bill (:LOL:)
--- End quote ---
Bill
No need to feel to bad, We all make them once in a while.
I was sitting back at the original post trying to figure out in my head how to do it and couldn't get it to work out. I figured that I must have forgot how to divide degree's. Now I know it was a trick question just to see if we were all paying attention. :lol: :lol: :lol:
Cheers :beer:
Don
PekkaNF:
Old thread but same type problem.....
Good old 4.500" TPF.
I'm trying to get my head around what it actually means and how do I make it meaningfull:
1) Aproximate angle in degrees to make rough check (included angle)
2) Exact numbers to make the taper in the lathe (top slide method = half angle)
So, this is the bugger: 4.500" TPF big end is 0.87"
http://www.wmsopko.com/images/D-00108-R.jpg
Great. I assume that 4.500" TPF stands here for included angle, which ratio is 4,5" for 12,0" and half angle would be 2,25" displacement at 12" distance? Is this correct and if not what actually then this 4.500" TPF stand for and what it is when setting the machine to do this taper?
I think I know but after reading this thread and being raised on ratios of half angle I am having this WTxxxx moment.
Pekka
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