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  #11  
Old 01-29-2009, 07:58 PM
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Very nice Jack! You should get good use from those.
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  #12  
Old 01-30-2009, 02:31 AM
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I've seen these tool holders for years in the catalogs but, never used one. I was just wondering, what's the advantage of them?

I've had end mills pull out of R-8 collets in the past. That'll bum ya' out if ya' don't catch it.
Are these tool holders better at keeping end mills from pulling down?

I'm of the opinion that actual end mill holders with set screws holding on the flat, are the safest bet.


Dave
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  #13  
Old 01-30-2009, 04:18 PM
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I've been wodering about that set. Can other collets be used with it?
ER-16 for example?
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  #14  
Old 01-31-2009, 03:31 PM
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I've been using this set for the last couple of day, and so far I very happy with the quality and operation of the collet set. To me it worth the price for nothing more than the piece of mind while using a 1" end mill, the first photo shows the 1" end mill in the new collet assembly, the second is the same end mill in a 1" R-8 collet, the new assembly is much more secure and allows to really tighten the collet and lock the end mill in. The R-8 collet actually holds the 1" end mill completely outside of the quill, in a collar with 3 slits in it, doesn't really give you a warm and fuzzy feeling, where as the Grizzly adapter is absolutely rock solid.

Dave to answer your question, I have used, and own couple of sets of the end mill holders and really don't care for them. If the end mill is a Weldon type, then they are okay, but I use a lot of carbide end mills, and they don't have the setscrew cutout, and I don't want to start cutting up a $50+ end mills to put one there. Most of the end mills I have bought in the last couple of years are not the Weldon type, just a straight round shank. This means collets of one kind or another, I believe the Grizzly set is more secure than a standard R-8 collet. I also slide the end mill us as far as possible into the collet, right to the top of the flutes, and IMO, have more surface area in the collet grabbing the end mill that a single set screw, of course this is my opinion, and my thinking maybe askew.

Jack
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  #15  
Old 02-01-2009, 01:58 AM
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Thanks Jack, that's interesting. I never used many carbide end mills and didn't realize that, they don't have set screw flats. Also, you're right, that 1" R-8 is scary looking. We only had them up to 7/8" in the toolroom and the end mill was inside the spindle on them.

It stands to reason, I guess, with all those slots in the quick-change collets, that they can get a tighter grip on the end mills, by conforming to the diameter better.


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