You didn't say whether you needed to cut to a square shoulder or not, but I have some suggestions to share. If you're interested in a 2" or larger face mill, read the attached. I have five of these face mills in different sizes and that take both insert types discussed, and they have been beyond my expectations. I think they are terrific value. I mate those face mills with precision R8 arbors made by Sowa that are available from Suncoast Tools I have tried several other types including Shars and been disappointed in the precision alignment of the insert pockets. Have a look at this test I did a couple years ago.If you want more of a conventional indexable end mill, I have an Iscar 1" that I love. It takes APKT or APMT inserts which are available in a variety of grades for various material types. You can see it in action in the Shars video test at about 4:00 in the timeline.This is what it looks like - I bought this used on eBay and have really put it through the wringer. It's a 3/4" Shank with 1" cutting diameter and takes 4 inserts:The designation for this Iscar is E90A and they are available in several diameters from 0.375 upward. There are a few listed as new open box, and some used on eBay This is the current production model on MSC: https://www.mscdirect.com/product/details/60841103 I can put you in touch with an excellent independent tool rep with 35 years experience if you want - just message me (not chat, but message).Hope this helps.David
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Allow me to fulminate about one of my personal hot button issues.Yes a 3" carbide face mill is pushing the envelope for an R8 spindle. If you attempt to increase feed or depth of cut beyond a moderate skim you may stall the cutter and arbor momentarily in the spindle. It can and will happen because an R8 spindle has no positive driving feature like the face keys on a milling machine taper spindle face. The R8 taper by itself has insufficient friction to drive larger cutters to capacity.Some may point to the indexing key in the R8 spindle as a driving feature. This "key" is the hardened dog point of a 5/16-32 set screw. Work the numbers for shear strength and the indexing screw fails at 80 lb ft thereabouts - NOT a positive driving feature om the scale of cutting forces action of spindle tooling. When the dog point fails, the broken stub is carried around the arbor key way to score up the upper spindle socket making arbor extraction very difficult and damaging the precision fit in the upper socket forever.The spindle and arbor are heat-treated. It will survive undamaged the moment of slip it takes to stop the machine or relieve the cut. The precision fit spindle socket will never be the same after shearing the index dog point.The solution is to remove the spindle indexing setscrew forever. This indexing setscrew is accessed by removing the lower bearing retainer and locating the tapped hole in the spindle just beneath the bottom end of the quill housing. Remove the retainer by backing off the retainer screw in back of the quill. Loosen the retainer with a strap wrench and remove it. The indexing set screw is in two sections: the dog point itself and the screw that locks it. Be sure to remove both. Reassemble etc.Use your 3" cutter with caution and vigilance only after tensioning the draw bolt to yield and removing the indexing set screw..To answer your question: most any 1" face mill to R8 adaptor will mate your 3" face mill to your spindle.Look here:
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