Say

I have been trying to find a calculator to do this online but have had no luck. I need to go from 30mm to 27mm over a 50.65mm length of tubing.

Any help would be appreciated.

KD

## Calculating compound angle for taper bore

### Re: Calculating compound angle for taper bore

How about a re-print from a previous question...

Glenn Wegman wrote:So,

75mm long

large end=12mm

small end=4mm

Large end - small end= diameter change. 12-4=8

Since the taper attachment only wants to know the half angle, divide that by 2. 8/2=4

The half angle change would be 4mm in 75mm.

The angle in decimal degrees would be found using: atan=(height/length) or atan=(4/75) which is atan .0533 which is 3.0528°

Now to convert decimal degrees to degrees, munutes, seconds:

3° is the degree, which leaves .0528° to be converted into minutes.

Multiply .0528 by 60. .0528 x 60= 3.168. Which 3 would be the minutes, so we now have 3° 3'.

Now multiple the remaining .168 by 60: .168 x 60= 10.08. Which 10 now becomes seconds, so we now have 3° 3' 10".

I'm pretty sure someone that knows something about trigonometry (definitely not me) can show a simpler way to do it, but that is one way to do it since you have a taper attachment and will most likely need to do it again!

Glenn

Operating machines is perfectly safe......until you forget how dangerous it really is!

Operating machines is perfectly safe......until you forget how dangerous it really is!

### Re: Calculating compound angle for taper bore

This is the angle per side or what to set the taper / compound to

Tan = rise/run 0r opposite/adjacent

Rise =(30-27)/2

run =50.65

tan (angle)= ((30-27)/2)/ 50.65

angle =atan (1.5/50.65)

ANGLE= 1.696 DEGREES

Tan = rise/run 0r opposite/adjacent

Rise =(30-27)/2

run =50.65

tan (angle)= ((30-27)/2)/ 50.65

angle =atan (1.5/50.65)

ANGLE= 1.696 DEGREES

Rick

“We make a living by what we get, but we make a life by what we give." Sir Winston Leonard Spencer Churchill (1874-1965)

"Peace is that brief glorious moment in history when everybody stands around reloading". Unknown

Murphy's Law: " If it can go wrong it will"

O-Tool's Corollary: "Murphy was entirely too optimistic"

“We make a living by what we get, but we make a life by what we give." Sir Winston Leonard Spencer Churchill (1874-1965)

"Peace is that brief glorious moment in history when everybody stands around reloading". Unknown

Murphy's Law: " If it can go wrong it will"

O-Tool's Corollary: "Murphy was entirely too optimistic"

### Re: Calculating compound angle for taper bore

excellent post...Thank you. Simple, direct, educational.Rick wrote:This is the angle per side or what to set the taper / compound to

Tan = rise/run 0r opposite/adjacent

Rise =(30-27)/2

run =50.65

tan (angle)= ((30-27)/2)/ 50.65

angle =atan (1.5/50.65)

ANGLE= 1.696 DEGREES