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I wouldn't go bigger than 2" with 4 inserts in that style of indexable milling with 1.5hp in steels. Mild steel I wouldn't take more than a .03 DOC depending on the radius @ 500 rpm with a feed of 15 IPM for starters, just to see how things shake out and how tight everything is. Aluminum...

I like using air when milling most steels. No cutting fluid will help, until you find the proper feeds and speeds for the tooling your are using IMO. The chips will tell you to either slow things down or speed things up. Air will give you a good indication as to how well your speeds and feeds...

My apologies as well. I'm not an experience online forum guy myself to notice these things. Heck, I have a hard time finding posts that I already posted in after a few days lol. That tooling would be great for an older manual horizontal mill.

@60 rpm and .2 IPM... with coolant! Although, even at that point, 1 would need a helmet and good chest protection!

As convenient as it will seem, I wouldn't recommend mounting anything indexable in a collet. Depending on what you are machining... Have you looking into a feed mill type with say 3 or 4 inserts? That's a number of inserts lol, how much HP does your mill have.

Good equipment for those that have surpassed the hobby aspect of machining IMO. Looks to me like the tooling would not be of much use for the entry level machinist, nor the average hobby machinist. It would take several years of experience in order to use what I see on the tooling side of...

For sure, that machine was meant for hogging at low RPM's back in the day. Worth every bit of the 1k if that's what someone was planning on doing with it.

The chip color and formation will tell you what the cutter is asking for, prior to wear and breakage. ( This is better than any calculated speed and feed chart, well, unless you find an old machinist handbook 25th addition or older ) A new HSS endmill will want less RPM with a little more feed...

X2 here