Still consider myself a complete nuub and have so much to learn.
Can mild steel have hard spots?
Using a fly cutter for the first time on my mill. Using high speed steel and my first attempt at grinding a fly cutter bit. Squaring up mild steel stock purchased from steel supplier cut off bins. So I started cutting and all seemed to go well on first few passes. I was experimenting with depth of cuts and mill seemed to handle up to about .040 ok but backed off to .020 cuts. Chip color seemed ok not colored. Then midway through a cutting pass, saw a spark or two and cutter stopped throwing chips. Thought cutter must be getting dull so reground edges, the tip did look a bit hammered. Put it back in the mill and first run through, cutting fine then hit something hard and killed the bit. Long explanation to asking, should mild steel from a supplier have hard spots? It seems like mystery metal. I had a small braised carbide lathe tool that was approximately the right shape that cut through the hard spots ok but wow I wasn't expecting that. Is this typical?
John from MN
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Can mild steel have hard spots?
Using a fly cutter for the first time on my mill. Using high speed steel and my first attempt at grinding a fly cutter bit. Squaring up mild steel stock purchased from steel supplier cut off bins. So I started cutting and all seemed to go well on first few passes. I was experimenting with depth of cuts and mill seemed to handle up to about .040 ok but backed off to .020 cuts. Chip color seemed ok not colored. Then midway through a cutting pass, saw a spark or two and cutter stopped throwing chips. Thought cutter must be getting dull so reground edges, the tip did look a bit hammered. Put it back in the mill and first run through, cutting fine then hit something hard and killed the bit. Long explanation to asking, should mild steel from a supplier have hard spots? It seems like mystery metal. I had a small braised carbide lathe tool that was approximately the right shape that cut through the hard spots ok but wow I wasn't expecting that. Is this typical?
John from MN
Sent from my iPhone using Tapatalk