Tooling & Production February 2006

"Shop Talk with Steve Rose"

The Author, Steve Rose

Using Your Trig Skills

Wow, trigonometry can help in many machine shop situations.  Over the past few months we’ve shown that trig should not be a fear-inducing subject.  Now take your new trig skills and answer the following questions!

 

 

1. Calculate the size of the marked angle.

Solution 1

 

 

2.  This piece has a 60 degree included angle.  Calculate the unknown length.

 

Solution 2

 

 

3.  Here is a 7/8” diameter HSS jobber drill.

What is the included angle of this drill?

Knowing the size of the included angle, calculate the length of the drill point.

 

Solution 3

 

 

 

 

 

 

 

4. The ID taper on this part is a National Pipe Taper.

What is the definition of a National Pipe Taper?

 

Calculate the ending bore diameter.

 

Solution 4

 

5.  Calculate the taper angle.

Solution 5

 

 

6.  Calculate the unknown length.

Solution 6