The cutting parameter calculator n will allow you to easily calculate the spindle speed, i.e. the number of revolutions per minute. Enter the tool diameter and cutting speed.

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The tool feed rate calculator F allows you to calculate the feed rate of one cutting edge. This depends on the number of blades on your tool (Z) and the rate of rotation (n).

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Cutting threadby hand

Cutting threads is an important element of machining. Even if you aren’t into making your own, custom-sized threads, it still helps to know how to create them. We’ve seen customers get pretty creative with their machines and cutting methods, but with a Tormach mill, there are three main ways to cut threads.

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Using Tormach’s RapidTurn accessory, you have a small lathe right on the table of your mill. Similar to the old-fashioned method, you cut a piece of stock to the diameter of your thread with a standard turning tool. The difference comes when you can really utilize CNC. Using a single-point insert, you can use PathPilot conversational to create very precise threads quite quickly. This method can be a bit more complicated as you have to compensate for the tool tip, but once things are set up, the turning is the fastest way to get precise threads. Read: Tool Centerline Tolerances for Turning

Cutting threadtypes

To calculate tool rotations n we need to know the cutting speed Vc, in other words the number of rotations of the cutting blade, given in meters per minute.

A much more contemporary way to cut threads is by chucking up your stock in a vise (preferably a piece of hex stock) and cut it to the diameter of your thread. Once you have the portion of stock round and cut to the proper diameter, you use a thread mill and PathPilot’s conversational programming to create precise threads. This way, you can develop threads at the exact pitch and size that you are looking to achieve.

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For each milling or turning machine, it’s very important to choose the right cutting parameters. A wrong choice results in much faster tool wear and higher costs. How do you choose the right cutting parameters? The parameters we look for most often are n = revolutions – and F = feed.

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This method hearkens back to the old-school way of cutting threads with a manual machine. Basically, you mount the stock into your spindle and secure a lathe tool in your vise. Manually face off the stock to the desired size, and then use a die to create the threads by hand. The process isn’t easy and it’s kind of tedious, but if you need threads made, this is a quick and dirty method.

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Too slow cutting speeds lead to edge build-up and blunting, while too fast results in quicker insert wear, deformation and poor finish.

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