On Tue, 2012-10-30 at 16:27 -0400, John Stewart wrote: > Jeremy; > > > an endmill holder of course!!! thats what they are for. > > If you mean the ones with the screws on the side for weldon-shanked end > mills, they have other issues. > > By definition, the holes in these holders are larger than the end mill shank. > (otherwise you'd never get the end mill in) > > The screw acts as a pivot point. So, you essentially have an end mill flexing > in the holder; leading to wear, and if the end mill is not inserted properly, > it *will* walk out as far as the screw will allow, so if you do use these, of > course you are going to pull the end mill out by hand as you tighten the > screw. The wear will appear as oval on the end of the holder, but it'll be > tapered. Think about it - you are shaking that end mill shaft a few thousand > times per minute, and there IS play in there. > > Ok, ok. I gave away my clarkson auto lock chuck because screwed end end mills > are not available, while plain shank end mills are a dime a dozen. (that's an > expression, not a pricing structure!) > > For the last 2 decades I have only used top-quality ER collets. My ER-25 set > are Regio-Fix (Swiss) with Schaubin (sp?) holder. My 16 and 40 sets were from > Maritool - probably paid too much, but as they all "just work", with no known > issues, so I'm sold. > > Just make sure that they are clean (I use a bit of aluminum "flashing" > rescued from some house-repair contractors to clean the grooves of the > collets). > > Anyway, I'm no expert, but the above may be something to think about. Will > *you* experience wear in these screwed-shank holders? I've absolutely no > idea, just keep it in the back of your mind that this can and does happen. > > Back to your regularly scheduled programme… ;-) > > > John Alexander Stewart.
A lot of the stuff I used to get from Boeing surplus had a whistle notch ground in the shank. While they can some loose they don't do it very often. I regularly use ER20 collets , carefully torquing the nut to 75 ft-lb. They don't seem to come loose even on the Mazak. Dave > ------------------------------------------------------------------------------ > Everyone hates slow websites. So do we. > Make your web apps faster with AppDynamics > Download AppDynamics Lite for free today: > http://p.sf.net/sfu/appdyn_sfd2d_oct > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_sfd2d_oct _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
