Use a Digital Microscope to Monitor Insert Wear

Last modified: February 22, 2024

I stumbled upon this technique on Practical Machinist and was quite impressed by it. How frequently do you find yourself on the manufacturing floor, particularly in a Job Shop, questioning, "For how long have these inserts been installed?"

Tracking tool lifespan can be challenging unless you've invested heavily in automation. Inserts and other tooling components tend to wear out, and it's always more advantageous to detect the wear before any tool breakdown.

If you possess a digital microscope, this task becomes simple. USB digital microscopes are an affordable solution for those who can access a computer at their CNC machines.

Check it out:

A digital microscope with a white body and red light on its top, placed on a black surface.

One handheld digital microscope on your cart...

Computer numerical control (CNC) lathe with touchscreen interface and digital display.

Some controllers run Windows and you can plug a USB right in...

A hand holds a compact white digital microscope with a bright light illuminating its subject.

Lights help a lot, and they're not just for scaring the cat like the ones on vacuum cleaners!

A white digital microscope with black lens cap and red light on a workbench with scattered debris and metal components.

Checking inserts for wear

High-resolution microscopic view with detailed close-up of an object.

Close up of the insert

Sharp metal tool or blade edge, smooth and flat surface under magnification.

Here's a chipped insert that needs replacing!

Without a digital microscope like this, you'd have to pull the toolholder out of the carousel to get close enough to it to see what's going on.  This sure seems easier, and it's dirt cheap.  There are tons of USB digital microscopes on Amazon for $30 to $100.  Here's a typical model:

A monitor, micro USB cable, desktop microphone, and coin on a white background.

$39.99 via Amazon...

It has up to 1000x magnification and can also play back on a phone or tablet.

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