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| sbwhart:
Nice rescue Nick, its always a bummer when something like that happens, you may be able to hide the divot later on in the build with a bit of bling shiney brass bit. Have fun Stew |
| Bernd:
Nick, From that one picture it looks like you were "climb" cutting. That would be one reason that happened to you. Nice save on the part by the way. Bernd |
| NickG:
Bernd, I was climb milling as I thought it'd see if it gave a better finish so that is why it got dragged out then and not before, it was only the tiniest of cuts though. It was when I tried setting it up to attempt to save it when I found the vice wasn't clamping properly - not sure what's happened there. Will need to investigate, it clamped up fine when I removed both jaws though. Stew, I never thought of that. I might be able to bolt a brass plate over the top or something if it works! Hopefully I'll be able to finish the cylinder tonight and put this mishap behind me! Nick |
| Darren:
Nick, Some things I have found with climb milling.. You must have no backlash in the leadscrew/nut. Otherwise the milling will seem to be going fine and then suddenly the table jumps to take up the backlash. This forces the cutter to dig into the work further pulling the table quite violently. At the same time the cutter tries to drag itself out of the collet holder forcing it deeper into the work. Something has to give, either the work which can be dug into, or it get ripped out of the vice and across the room. Or the cutter snaps, again usually causing more damage to the work. Some machines are designed for climb milling, such as my Beaver, by having two sets of feedscrew nuts to totally eliminate backlash. Unless you have these then climb milling is always going to be a disaster waiting to happen. Proven several times on my Sealey milling machine :( |
| CrewCab:
Nice going Nick, you'll get over the minor divot I'm sure :thumbup: --- Quote from: NickG on November 04, 2009, 03:27:18 PM ---Why is it I mess about with all these tools to get a good finish and the best bloody one is the parting tool?! --- End quote --- You've already answered that one Nick :poke: Good thread, looking forward to more. :clap: CC |
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