Machining or parts like keyway in coupling hub, how it's done

Sometimes new coupling hubs required for new or old jobs.
Most have keyway to be machined out after boring hub.
Machine shop we use says they will "Hot wire" keyway, what is that ?

It's called Hot wire EDM & find it amazing what they can do with it.
Check out Youtube below, new to me, but been around awhile.

https://www.youtube.com/watch?v=pBueWfzb7P0

https://www.youtube.com/watch?v=3v6awStgUgM

The old fashioned way is to use a broach in a press.

Youtube here..

https://www.google.co.uk/url?sa=t&so...N8ZFOD4xbU2nov

Quote:

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Originally Posted by Brian_UK

The old fashioned way is to use a broach in a press.

Youtube here..

https://www.google.co.uk/url?sa=t&so...N8ZFOD4xbU2nov

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Brian, still in use of course, as hot wire system expensive to purchase.
A lot of machine shops mass produce with CNC machines, this is just another interesting way of doing things

Sure is, our home mancaves are struggling yo keep up nowadays.