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| Swingup external threading tool |
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| andyf:
I'm due for a shearing, too, Bogs. Seems to grow faster in winter - must be an evolutionary hangover from a furry Ice Age past. Mustn't complain; at least I get my money's worth at the barber's shop. And he's taken up my suggestion of substituting grey smocks for the dark blue ones against which the cuttings looked so depressingly grey :( Now, the silver hairs don't show up and I can take comfort from the remaining mouse-coloured trimmings :ddb: I suppose the simple answer to my misgivings over the tenon is to try it. If it stops the thing working smoothly, just loosen the Loctite with heat, yank it out and see if the device works without it for RH threads only. I like the idea of the swarf gaps; apart from the swarf problem, they will reduce the contact area, and hence friction, between the parts when they move in relaion to each other. Next instalment is eagerly awaited. Andy PS Might a hairpin-shaped light spring, located with a loop round the pivot, give more positive swing-down? |
| bogstandard:
Andy, That was the reason I left the top part on the main channel, if I couldn't get it to go down under gravity, I was going to drill a small hole in the swing block and pop a spring in there. I seem to have answers for everything anyone comes up with, but what you don't realise, this had been fermenting in my head for over a week, and I had already looked at the thing from most angles. John's suggestion was the one that I hope will get this thing to a finished working tool, and that was the area I was stalling on. Have a look at the C-o-C, that is now what I envisage a finished, easy to fabricate one would look like. A few easily made bolt together bits with a tiny bit of fine tuning on the block. Nowhere near as complicated as the one I have made. This would also allow for a complete swing away of the threading tool, for measuring the thread with a nut. Mine had to be made as it was to cater for all known problems that I thought might crop up. It is always invariably the same, the prototype is always more complicated than the finished product. John I would just like to add, after all this work, it is still very similar to the original concept by Mike Cox, except for the block, moved pivot point and clearances for swarf. |
| John Stevenson:
Devils advocate here ::) The swarf gap worries me, if there is a gap then small stuff will be OK as that what it;s designed for but what happens when it comes across thicker swarf? Some may start to enter then wedge. Most swarf will enter from the front, what about pushing an O ring over the end of the rocking holder to seal the gaps but still have them ? John S. |
| jim:
just a thought on the swarf, wouldn't it be possible to put a rubber "skirt" around the tool? i look forward to seeing the end result :thumbup: |
| bogstandard:
John, I already have this in hand if needed. I was going to use a very thin bit of litho plate on the front and side of the tooling with just the threading tool poking it's nose thru. In fact on the trials to come, I was going to stick double sided tape to the outside of the temporary plate to see just where the swarf would be causing a problem, by seeing where it ended up when it stuck to the tape. Talk about R&D, no flies on me on this one. It all might not be necessary, and the tool stays perfectly clean, but every angle has to be explored initially. John |
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