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http://www.practicalmachinist.com/vb/general/best-material-make-machine-arbors-no-post-machine-heat-treat-279153/

1. CountryBoy19

   Aluminum

   Join Date

   Aug 2012

   Location

   Bedford, IN

   Posts

   155

   Best material to make machine arbors (no post-machine heat-treat)??

   I need to make a couple arbors for some indexable tooling for my B&S #9 spindle. The only commercial option for what I'm wanting is available only in a solid carbide cylindrical shank (would have to use in a collet) and costs ~$1600. Way, way too much. So I'm going to make my own arbor on a CNC lathe; while I'm doing that I may as well make it directly couple to my B&S 9 spindle.
   
   I won't be able to do post-machining heat-treat or grinding so I need something machineable but something that will hold up well. My first thought is 4140 PH, but is there something better?

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2. 01-27-2014, 02:21 PM #2

   

   rklopp

   Titanium

   Join Date

   Feb 2001

   Location

   Redwood City, CA USA

   Posts

   3,425

   

   LaSalle ETD-150 is nice to machine, stable, good for arbors. You can get it from McMaster. It's resulfurized 4140 with proprietary HT.

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3. 01-27-2014, 02:58 PM #3

   XD341

   Cast Iron

   Join Date

   Mar 2011

   Location

   NY USA

   Posts

   342

   

   The ETD is good stuff. Along the same lines 1144 stressproof or fatigue proof are also very nice high yield materials that aren't hard to work with. Short of tool steel that's about as good as it gets from a workable durability standpoint. ETA I'm sure there are some maraging steels that would be better but that stuff is kinda expensive.