How does a rotary hammer drill work? (electro-pneumatic hammer mechanism)

Ever wonder how a rotary hammer works? How does it hammer? What's an electro-pneumatic hammer mechanism?
I've got one open for repair, so let's take a look at how it works!

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Ever wonder how rotary hammers hammer? What's an electro-pneumatic hammer look like? How does a motor turning run a hammer mechanism? Well, with the help of a Ramset Dynadrill DD526 (rebadged Bosch GBH 2-26) Let's find out.

00:00 - Prologue
00:09 - Intro
00:24 - Parts
00:52 - Swing bearing
02:33 - Piston
03:39 - Pneumatic hammer
04:27 - Tool holder
04:52 - Full mechanism
05:22 - Why pneumatic?
07:01 - Hammer in motion