08-19-2012, 10:42 PM
Phil,
4140 is probably overkill for an arbor. A better bet would be mild steel, or 12L14 for a super finish. Whatever you use, don't harden it. You want the taper to be softer than the spindle it fits into so when (not if) it spins, it won't cause damage. MT adapters are always left soft for this reason.
Tom
4140 is probably overkill for an arbor. A better bet would be mild steel, or 12L14 for a super finish. Whatever you use, don't harden it. You want the taper to be softer than the spindle it fits into so when (not if) it spins, it won't cause damage. MT adapters are always left soft for this reason.
Tom
![[Image: TomsTechLogo-Profile.png]](http://tomstechniques.com/wp-content/uploads/2013/11/TomsTechLogo-Profile.png)