Just because your facemill has places for four inserts doesn't mean that you have to use all of them! For larger units I don't have the horsepower to use 4 inserts so just use 2. My most used is a 50mm four insert unit with only two inserts. I have a 4-inch facemill that takes 5 inserts but I use only 1 insert. Yes, it is out of balance but causes negligible vibration due to the weight of the body.
I agree that there are better choices than triangular inserts. SEHT inserts have four edges and give an almost mirror finish in aluminum. APGT/ APKT/ APMT inserts have two edges, work well and are very cheap on eBay.
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If you want to learn more, please visit our website Types of Morse taper sleeves.
• Made of Alloy Forged Steel for a long durable service life
• Hardened to RC 56-60 and ground to ensure maximum accuracy
• Shell end mill pilot T.I.R. <0.0004”
• Each set is provided with a wooden case
• Draw Bar Threads:
7/16” – 20
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