Dec 28, 2020
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Bidirectional thread on a lathe

How to cut threads in two directions on a lathe with your own hands

The ideas for turning work are truly endless. It would seem that nothing new can be invented, but turners never cease to amaze. The idea is to make a ten-start thread that can be screwed on in any direction.

What you need:

  • lathe;
  • router with adapter;
  • tungsten carbide cutter with a grinding angle of 60 °;

    tungsten carbide cutter

  • duralumin blanks.

Ten-start thread making process

For this work, you need to make a mandrel for the router to clamp it in the lathe instead of the cutter. Before installing it, you will need to grind the rod. You can determine its size and thread pitch according to the GOST 19258-73 table. In the example, the thread is M42 with a pitch of 4 mm.

Thread in the table of GOST 19258-73

Since the thread has ten starts, the pitch of 4 mm is required to be multiplied by the number of starts. That is, the machine is adjusted to a step of 40 mm. Before starting work, make sure that the cutter approaches the workpiece at a right angle. The cross feed limb is set to “0” at the moment the cutter touches the blank.

adjustable in steps of 40 mm

The first step is to grind the workpiece at the end of the thread to create a groove for the cutter to exit.

Cutter angle

This is done with a router. The lathe spindle must be set to minimum speed. Even if it is too fast, you will have to use a frequency converter.

Bi-directional thread on a lathe

The thread is cut to a depth of 3 mm. Depending on the power of the router, milling should be divided into 3-4 passes. Having prepared one pass, you need to move 4 mm to cut the next turn, etc.

milling 1 pass

milling must be divided into 3-4 passes

After cutting the right-hand thread, it is required to switch the machine to the left-hand cutting mode. Further, everything is done in the same way, but in the opposite direction. The blank itself can be styled like a bolt by forming a hex head at its end.

Lead thread in the left direction 1 lead

Lead thread in the left direction 4 lead

The thread in two directions on the lathe is almost ready

Finally, 2 ten-way nuts are cut.

ten-way nut

One on the left, the other on the right. As a result, we get a very interesting souvenir.

We screw the nut onto the thread

Tighten the two nuts

Bidirectional thread on a lathe with two nuts

Watch the video

Oleg Pevtsov on his YouTube channel shows how this can be done on a lathe with his own hands.

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