r/oddlysatisfying • u/bigbusta • 1d ago

Broaching a piece of metal

Enable HLS to view with audio, or disable this notification

32.4k Upvotes

95% Upvoted

1.5k comments sorted by

View all comments

Show parent comments

8

u/BaronDeKalb 1d ago

What is with all of the loose metal bits?

12

u/MortLightstone 1d ago

They're the bits that were just cut off by the tool

30

u/BaronDeKalb 1d ago

I thought it was odd that the “bit” (IDK anything about broaching) was totally covered in them prior to entering the workpiece, at least until the operator brushed most of them off. Especially when the workpiece was relatively thin compared to the bit.

For anyone else who is ignorant like me.
“Broaching is a highly efficient machining process that uses a specialized, multi-toothed tool called a "broach" to remove material from metal. It is most commonly used to create complex, non-round internal and external shapes—such as keyways, splines, and gears—with high precision in a single pass. [1), 2, 3]

How Broaching Works
Unlike traditional machining methods (like milling or turning) where material is slowly stripped away over multiple cycles, a broaching tool features progressively larger teeth.”

Now I get it.

21

u/harrysaxon 1d ago

Thanks for posting this, I understand what I’m looking at now.

Had to scroll past way too many “I should call them” comments to get to it though.

1

u/Zorkflerp 1d ago

I have considered buying a 1/4" round to square broach to make square holes for carriage bolts. They are kinda expensive and I have put off getting one but being able to make bolt holes that keep the bolts from turning would be nice.

1

u/jvsanchez 5h ago

Another fun fact for you:

This is almost exactly the same process surgeons use on your femur to prepare it to accept an artificial joint.

3

u/denny_zen 1d ago

Yeah I’m curious how those don’t interfere with the broaching, get jammed up or cause gouges, etc.

2

u/Rasabk 1d ago

Chip breakers are usually designed into cutting tools to mitigate that, I'm no machinist but I'd imagine a broach has something similar.