How to choose thread turning tool

When turning threads, there are three main types of tools to choose from: all-tooth, V-tooth and multi-tooth tools. Each type has its advantages and disadvantages.

1. Dental tool

All-tooth tool is the most common cutting tool type. It is used to cut a complete threaded tooth profile, including the crown.

advantages

 Make sure you have the correct depth, bottom and top of the thread

 No need to deburr the thread thread

 The tip radius is larger, so the number of runs is smaller than the V-tooth tool

 Ensure efficient threading performance.

disadvantages

A tool is required for each pitch and tooth type.

Attention! An extra allowance/material of 0.05-0.07 mm (0.002-0.003 in.) should be left on the workpiece to ensure that the top of the tooth can be reached during final threading.

 2. The v-shaped tool

V - shaped cutting tools do not process threaded tops. Therefore, before threading, the outer diameter of the screw and the inner diameter of the nut must be turned to the correct diameter.

advantages

 High flexibility; The same tool can be used for machining many different pitches, provided that the thread profile Angle (60° or 55°) and radius are the same

 Minimal tool inventory

disadvantages

 The tool tip radius is small, which shortens cutting tool life

 There may be a burr problem

3. Multi-edged tools

Multi-tooth tools are similar to full-tooth cutting tools but have multiple cutting edges (NT > 1). Double-edged tools double productivity, triple-edged tools triple productivity, and so on.

advantages

 Fewer runs are required, which increases tool life, increases productivity and reduces tool costs

disadvantages

 The longer contact length of the cutting edge results in increased cutting force, so you need to operate under stable conditions

 You need to leave enough space behind the last thread to allow the last tooth of the blade to pass and get the full thread depth