Posted: 5/26/2025 9:29:34 PM EDT
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I got my DRO’s installed so I wanted to move on to an actual project. Basically, I need to make an adapter plate for my rotatable to attach a 6” 3-jaw chuck to it. I got an 8” diameter piece of 9310 for a decent price back in October and thought I’d attach it to the table with a couple of clamps and run the face mill 2” 3-insert) over it, flip it over, and do the other side. I started cutting but it was kind of a pain to move the clamps so I thought I’d use my new edge clamps instead. Since they were taller than the material I put 4 x 1-2-3 blocks under it to lift it and clamped them down which is where things went sideways. It was chattering and cutting weird only getting worse as I went on so I finally gave up and walked away. I came to realize after the fact that it was tempered and quenched so it had a Brinell hardness of 330 which was way harder than I expected. Consequently my RPM of 700 was way too high as was my feed rate and I wound up chipping all 3 of the inserts. I don’t need hard material for this so I’m just going to get some plain 1045 or maybe even aluminum and try again. I just feel like an idiot for beating on the machine by doing this as I’m still new and don’t know what’s “normal” sounding with steel and face mills. No reason for the post other than to vent. I just really, really don’t want to hurt my new mill by being stupid. |
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It happens. I made some form 1 baffles from 17-4PH. Forgot how that works hardens. Ended up making too small of cuts which did nothing but make things crazy hard and hurt my inserts. Broke my 3/4" carbide 4 flute working on a piece of railroad iron. Let the power feed do it's thing while I did other things. Suddenly everything was silent. Looked over and the railroad iron was at a 45 in the vise with half the endmill stuck on it. Definitely going to fast. I've blown up carbides, thrown things from the vise, bent things in the lathe, knocked the vise out of square, you name it. More you work with your machines the more you'll oops but also the more you'll learn. |
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Originally Posted By Deerhurst: It happens. I made some form 1 baffles from 17-4PH. Forgot how that works hardens. Ended up making too small of cuts which did nothing but make things crazy hard and hurt my inserts. Broke my 3/4" carbide 4 flute working on a piece of railroad iron. Let the power feed do it's thing while I did other things. Suddenly everything was silent. Looked over and the railroad iron was at a 45 in the vise with half the endmill stuck on it. Definitely going to fast. I've blown up carbides, thrown things from the vise, bent things in the lathe, knocked the vise out of square, you name it. More you work with your machines the more you'll oops but also the more you'll learn. Thanks for the reply!! It definitely makes me feel better about my screwups. I think I’ll try it on aluminum first since I’ve never faced anything this large before and go from there. |
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Originally Posted By jm0502: A36 is fine Originally Posted By jm0502: Originally Posted By Firestarter123: Would A36 work for a backing plate given I’ll need to machine it or should I go 1018 or higher? A36 is fine Cool, thanks! I'll get some ordered and give it a shot. |
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Originally Posted By Deerhurst: Your thread makes me think I should start a matching screw ups thread. I should take a photo anytime I screw up something I cannot make work and post it. The thread will fill up fast! I'm all for a "screw-ups" thread as it'd make me feel better about myself 
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