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| johnny123:
Wonder if Mad Jack could draw me a diagram? Pretty sure I know what he is saying but a pic is worth a million shavings. |
| madjackghengis:
Hi Johnny, having looked at what you've done, and where you are at, I think I can explain it a bit easier now. The cutting corner of the insert should be dead center as to height, it can be held with the cutting corner straight out, which is easier to make, or with the edge of the insert on the tailstock side, parallel to the side of the tool holder, which gives you a bit more "swing" and less tool to interfer with the chuck, and less insert to interfer with the shaft the ball is being turned on. The tool holder can also be given a slight downward slope, toward the center of the turning set up, but keeping the leading edge of the insert on center, giving a slight negative rake, which may improve the cutting action depending on the material being cut. With the insert you got, with zero relief, the cutting edge must be exactly on center, or a few thousandths below the work, or it won't cut at all. I would suggest you not turn any stainless as it is tough, almost always substantially moves the toolholder in the direction of the cutting force, and would not go well with the brass material of your tool set up. My previous description was with an "up and over" design in mind, which is something I've been not getting to for quite some time. I hope this clarifies the subject some, I'm not very versatile with the computer or I'd know how to draw on it, but that is further down the road for me. You might also look for a positive rake insert and try it out as well, although it would not work with or need "downward slope tool holder". Such a holder just lets a zero rake insert get a better bite in the work while putting more pressure on the insert. good luck and just watch the swarf, it tells you what is going on. :thumbup: mad jack |
| johnny123:
Hello everyone, Finally finished the ball cutter and it works great!! |
| johnny123:
Sorry that last one I forgot to resize. Here is one that fits the screen. :lol: |
| Stot:
My thats shiney. :clap: Did you use it to make the ball knob on the handle already? Cheers Stot |
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