Taper of 1:50

[srirou]

Hi friends,

Please help me how to calculate the taper given as 1:50 in a slope is there any method how to calclate the taper.

Thanks in advance!

Srinivas

 

[benta]

No, from your drawing there is no way to calculate the minor diameter.

 

[hydtools]

1/50 = (D-d)/L

D = large diameter

d = small diameter

L = length of taper

or
D - d = L/50

Ted

 

[Occupant]

Unless you give it as a function of length.

 

[benta]

So, hydtools, what is the length ??

 

[hydtools]

benta, I have no idea. That's up to the srirou to decide.

Obviously it is a missing piece of information. That is what the equation illustrates.

Ted

 

[dinjin]

Inch taper pins are usually 1:48
Metric taper pins are usually 1:50

So d = D - L/48 inch sizes
d = D - L/50 metric sizes

L is length of pin

 

[Cockroach]

Maybe I'm missing something. Taper is simply rise over run, so 1:50 means 1 unit vertical to 50 units horizontal. The angle is then arctan(1/50) = 1.14576 degrees. If the taper is INCLUSIVE, then divide by two to get the face angle.

For example, I have a premium thread of 3/4 TPF (taper per foot)imperial. This means 0.75 inch rise for every 12.0 inches of run ON DIAMETER. The required angle is then 0.5 arctan(0.75/12) = 1.78817 degrees. This would be the standard half angle cone for LTC threads for oilfield casing. API listing is 1 degree 47 min.

You don't need diameter, just the understanding if taper is measured inclusive thereof.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

 

[hydtools]

If you have the taper rate(1:50) you do not need to find the included angle, just use the ratio to find the unknown diameter for a known length. 1 unit diameter change for 50 units of length.

Ted