How to cut a thread on a manual lathe (Intermediate method ideal for home workshop & hobby engineer)

How to cut threads on a lathe is a fundamental skill of any machine operator. This is an intermediate method that is ideal for most applications and lends itself perfectly to the home workshop and hobby engineer. Cutting threads on the lathe this way is both fast and low risk. The basic way to cut threads on a lathe is very slow. The more advanced way to cut threads on the lathe is a little more risky and you are more likely to make a mistake. It's not hard and i'm sure you are more than capable, there is just more to do and therefore more opportunities to make a mistake. I think this method of cutting threads on the lathe is a good compromise between the two. The beauty of cutting threads on a lathe using this method is it is very versatile. If you need to stop thread cutting and do another operation you can just come back to it and the tool with pick up where you left off. You can't to this with the basic method...

I was asked to make a new motorbike axle for a friends flat track motorbike. The axle is turned from S275 which is a steel with a yield strength of 275 MPa. It machines nicely and has good shock loading properties making it ideal for this application. The Axle consists of three diameters with an M14x1.5 thread on one end for a nut.

Here is a recap of the order of operations for cutting a thread on the lathe using this method.

First set up your part, tool, speeds and feeds.
Colour in the area you want to thread and do a scratch pass.
Check the scratch pass with a thread gauge.
Cut your threads.
Clean up with a file, emery paper, and scotchbrite.

For the actual thread cutting:
1) Wait for your number on the thread dial indicator
2) Then your number lines up, engage the half nuts.
3) The thread is cutting.
4) At the end of the thread, dis-engage the half nuts.
5) Withdraw the tool in the -X Direction. (+X if threading internally)
6) Move back in Z direction to your start point.
7) Put on your next cut and repeat until down to size.

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Rob
- Handmade Extreme -
Disclaimer: This video is meant for educational and entertainment purposes only. It is in no way meant to be a set of instructions and therefore no attempt should be made by any party to recreate what has been seen in this video. Any attempt to do so is done completely at your own risk.

Видео How to cut a thread on a manual lathe (Intermediate method ideal for home workshop & hobby engineer) канала Handmade Extreme