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| How do I....bore out a hollow section leaving the centre intact? |
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| AdeV:
Here's a picture Darren posted recently of his slitting saw arbor: Liking the idea very much, and having recently acquired a slitting saw with no arbor, I decided to more or less copy his design. But.... I don't know how to bore out the central section of the bottom of the arbor, whilst leaving the threads intact... I did try using a cut-off tool, but it just dug in & threw the work out of the chuck (which destroyed any concentricity I was hoping to maintain - lining stuff up in my 3-jaw chuck is next to impossible, and I've not yet got around to making the chuck key to remove it from the 4-jaw - and anyway, the 4 jaw has outside jaws not inside, so I'm not sure how useful that'd be with 2" bar stock). So, I used the simple route which was to make the 1" stub short enough that a flat-section base would sit on it. All very well, but because I'd had to re-chuck, it ended up not quite flat, so I've got a few thou run out. No prob - I've got lots of spare metal, and plenty of time over Christmas, so I'll have another go: But it would be nice to cut a hollow, like Darren's above. BTW, I do have a couple of boring bars, but I'm not sure they'll cut on the front face (in fact, one of them definitely won't) |
| andyf:
It would be a horrible job, going in from the front with a trepanning/face parting tool, like a normal parting tool but with relief on its LH side (looking from the tailstock) so it didn't rub. The overhang would be pretty big, too. Being lazy, I would just drill and tap a hole for a bit of threaded rod to be Loctited in. BTW, on 4-jaw independent chucks, you usually only get one set of jaws, to be reversed when you want to reverse the grip. There is no scroll inside such a chuck, so the teeth on the jaws aren't staggered from jaw to jaw as they must be with a scroll to get each jaw equidistant from the centre. Andy |
| Bernd:
If your talking about the threads in the bottom part of the holder, that is usally a bolt. The bottom part has a hole in it to pass the bolt through and into the upper part of the arbor. I believe our thinking that the threaded part is all part of one piece of the bottom? Bernd |
| Darren:
Bernd is correct, the bottom part is in fact two parts one of which is a normal Allen headed bolt. :thumbup: |
| andyf:
Oops, silly me - didn't look at the picture properly :hammer: Andy |
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