Mechanical Engineering - Production Engineering - Discussion

A positive or negative rake angles direct the flow of chips to the already made thread. If hot chips rubs against the threads, it will be damaged. So zero take angle is preferred.

Well i've read all the answers present here, none provide a reason which is worth satisfaction actually.

Thread cutting tool is a type of form (shape) tool, and recommendations for a zero rake angle is that is should be used where the shape of the tool is the shape of workpiece!

A single point thread cutting tool should ideally have positive rake angle. Because of positive rake give more safety to thread with respect to zero or negative rake angle.

Dear @Sanjith if you increase the rake angle the area of the tool will be reduced so the strength also reduces, in case of carbide tools we use negative rake angles because carbide tools are weak in tension. And coming to our answer if we use other than zero rake angle for thread cutting the rake face of the tool goes on to the thread and it causes the damage to the thread.

Single point thread cutting tool should have positive rake angle to provide more strength.

Using Zero Rake angle only we can produce threads. Why because if we use other then zero rake angle it will damage threads produced.