It's a way to notch tubing in a lathe. You mount a roughing endmill in a collet or the chuck, and the material is clamped to the cross slide/tool holder with a set of v-blocks and some clamps of sorts. On really big cutters or longer cuts it's helpful to use a live center in the end of the cutter to support is m(unless you like sharp metal bits flying at yo face!)
I primarily use a mill with a hole saw, I machined a tool holds the hole saw and it does alright.
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heymagic
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Reamer
I use a V block and rougher in a lathe to do the notches works very well. The last I new neither a band saw or a chop saw could cut round notches.The angle really doesnt matter at a rough cut stage. You can come up with that 1 spot where it may be handy but I wouldnt buy based on that 1 spot.
I agree with Jon on this. It is personal preference!
Like I said before I have a Milwaukee porta band (from my construction days)and a chop saw wins 99% of the time. So for a fab race garage I would go with the chop saw.
That is a nice welder by the way. Lots of fun projects you can build now.
So what the heck is a v block and rougher in a lathe? (I don't get out much) I learned to notch tubing with a torch back in the old days...