HOME MADE EXPANDER

[vertix19]

HELLO EVERYBODY , i need to make a couple of expanders to hold on the ID for machining a second op. on a cnc milling machine, i will use aluminum,can anyone please showme the best and fastest way to make an expander completly in a milling machine,thank you very much,any tips and suggestions are appreciated.

[guydrisc]

go to yur local muffler shop and give the guy 20 bucks to swedge your pipes

[Jay C]

I think he's talking about a expanding mandrel. All the ones I've seen look like they'd require a slitting saw.

jay

Here is an idea. depending on your material, you could wrap rubber, or sandpaper maybe.

[NEATman]

You could mill a post that is just under the ID of the part you want to hold.
Then drill and tap (or threadmill) the center of the post for a tapered pipe thread.
Then cut (endmill, slitting saw or if desperate hack saw) several slots.
Thread in a pipe plug loosely, install part over the post, and tighten the pipe plug. The tapered threads will cause the post to expand, holding the part it in place.

Keith