John Saunders Talks About - Using Small Tools in your Tormach Mill

The Rundown on Runout

As covered in our 10 Things No One Tells You About Machining article, runout is everywhere! However with most tools we use this amount is negligible. Using, say, a 3/8” endmill with .0008” of TIR won’t have significant consequences (especially when roughing). Unless you’re chasing tenths, the runout is such a small percentage of the tool’s overall diameter (~0.21%) that it wont have any noticeable affects. As you small diameter tools, this percentage begins to increase. Using a 1/32” endmill with the same runout amounts to a TIR that is 2.56% (about a 10x increase!). This can result in uneven wear, chatter, bad surface finish, missing tolerances, and even broken tools.

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6 small things that make a big difference to your CNC machining

Sometimes, there can be a lot to CNC machining – everything from computer programming to materials science is involved – but paying attention to a few things can make a big difference in the parts that you make. Here are six little things that can make a big difference with your CNC machining.

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John Saunders - Talks About Tolerances When Making Parts

09/ 17/ 2019

size tolerance tolerances

You probably already know this, but tolerances are important. If your product is a standalone part with only one component, tolerances may not be as important. Many machined parts, however, are destined to interface with another - whether part of a larger assembly or designed to be used with another product (such as an aftermarket car part). Tolerances are the key to making sure every part and piece of the assembly meshes together the way you intended. Tolerances separate good parts from great parts - so let’s take a look at a few types of fit. There are three important tolerance dimensions to be aware of. As an example, let’s take a look at the snippet of a drawing below, focusing on the highlighted dimension of .438” +.008” -0.000”:

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10 Things No One Tells You About Machining

  1. How to use an ER Collet

    ER Collets are often a go-to for machinists because collets are readily available at varying price points and allow a tool holder to hold varying size tools. ER collets also have a greater collapsing range than SK collets. However, there are a few things that aren’t readily apparent to the beginning machinist:

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John Saunders Talks Vises

05/ 15/ 2019

hammer vise jaws Vises Jaws

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Best Practices of Tolerance Stacking

09/ 18/ 2018

tolerance tolerances

This post originally appeared on the In The Loupe blog.

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