If one couldn't buy an appropriate broach, one would presumably turn, mill,
and harden some tool steel and make his own. Depending on the quantity, HSS
will be just fine for aluminium. An arbor press and a simple jig will take
care of the rest. A machinist's vise can substitute for the press.
It would be far simpler to just buy some anodized arms and modify them. Me
personally, I would probably file a flat on the splines and run a setscrew
up on it. Plenty of room to get fancy elsewhere.
You can buy broaches but they are typically very expensive.
If what you want is in the order of 1-1/2" dia, let me know.
I can prolly dig up something for you.
But if you're talking about RC servos, that's another story.
I've done this kind of thing using a keyway approach.
Secured the key to the cylinder part.
Never even occurred to me that if I put in more keys in I
would prolly get less binding!
I think I used a shaper to cut the inside keyway for the cylinder.
But you could do the same thing on a lathe by running the compound
back and forth, left to right.
Refugee from rec.crafts.metalworking :-)
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.