Question

Find out the speed setting rpm for a high speed steel drill d24 to cut a workpiece of phosphorus bronze . maximum cutting speed with hss for phosphorus bronze is 35m/min​

Answer 1

The speed setting rpm for a high speed steel drill = 464.2 rpm

Given:

Maximum cutting speed with hss for phosphorus bronze is 35m/min​.

Diameter of drill = 24 mm

To find:

The speed setting rpm for a high speed steel drill.

Formula used:

Cutting speed = $\frac{\pi \times D\times n }{1000}$ m/s

Where,      n = Speed in rpm

Explanation:

Cutting speed =  35m/min​.

Diameter of drill = 24 mm

So from the formula

Cutting speed = $\frac{\pi \times D\times n }{1000}$ m/s

                  35  =  $\frac{\pi \times 24\times n }{1000}$

                   n = $\frac{1000\times 35}{\pi \times 24 }$

                   n = $\frac{35000}{75.398 }$  

                   n = 464.2 rpm

The speed setting rpm for a high speed steel drill = 464.2 rpm.

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