Competitive Cyclist Reviews SRAM XX Dome Cassette:
That was indeed a nice piece of work!
No way was that done by hand. You'd end up with 90% scrap parts. That's why CNC was invented in the first place: to remove operator error from the machining process.
And look at the through hole weight saving material removal between sprockets. They appear to have about a 32nd or a 16th of an inch radius in the corners. This will require an equally small milling tool to produce. With such small tools, feed speeds will be very low to prevent tool breakage. And there are LOTS of them.
I can see where they probably roughed it out and bored the center hole on a lathe. Makes sense to true it up with a good facing vs. the bore placement.
The vid said it took 9 hours on the mill. This may be what the sales rep told the video guys. He may, or may not, have been completely accurate on the time factor.
Cool part though. Dave
PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.