Expanding Mandrel

[jbaklund]

rod w,

I like your solution, and your mandrel looks clean. As has been said on this thread it's a cheaper route to go. Baklund R&D's mandrels hold evenly across the face, they are hardened, and they are more expensive. Also make them a custom sizes and shapes.
View attachment ImageUploadedByModel Engines1421020481.963286.jpgView attachment ImageUploadedByModel Engines1421020643.067881.jpg

 

[Nitrous]

Instead of a tapered pipe plug, I just use a tapered tap on the hole then use a socket cap screw. As the cap screw hits the tapered part of the thread the mandrel will expand enough to hold the part.

We're only talking about making the mandrel just small enough to slip the part on that you want to turn concentric.

Paul.

This might be something to accomplish your goal. https://www.leevalley.com/en-ca/sho...5528-individual-beall-ix-collets?item=44J0788
(I have nothing to do with this company ~but info the link is verboten, please delete. )