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| Swingup external threading tool |
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| NickG:
Bogs, great write up and that certainly looks a lot different to the block of metal you started with. A lot of work in that. :bow: Nick |
| bogstandard:
Chuck, I am renowned for NOT making shop tooling, especially if it can be bought cheaply. But when an idea like this does get into my head, and you can't buy it from anywhere, I love running with it to a conclusion. In this case, although it does look to be a little complicated, mainly because I made it to fit my own toolpost, if it works when finished, I have no doubts that the average Joe in a workshop could fairly easily replicate it in a size and guise that would work for them. I am struggling at the moment trying to fulfill the two comments criteria placed upon the retracting toolpost and this swing type, namely to be able to cut left hand threads (swing), and the most difficult one, by John Stevenson, to get the cutting tool close enough to the chuck without the holder hitting (retracting). The left hand threading is easy, unfortunately, the easy fix for that compromises the getting close problem. I will have to see just how much material I can cut away to achieve it, and still retain enough rigidity in the tool. Luckily, single point threading, if done correctly, doesn't require massive cutting loads. Darren, Thanks, but of course it is all mainly due to machine rigidity and sharp cutting tools, which for the first one, most people can't achieve to a high degree. I am very lucky in that department. It is a shame that flash photography shows up all the minute machining marks, that in real life, the surfaces are like silk, and a quick once over with some W&D, the marks will disappear completely. John |
| andyf:
--- Quote ---I am struggling at the moment trying to fulfill the two comments criteria placed upon the retracting toolpost and this swing type, namely to be able to cut left hand threads (swing), and the most difficult one, by John Stevenson, to get the cutting tool close enough to the chuck without the holder hitting (retracting). The left hand threading is easy, unfortunately, the easy fix for that compromises the getting close problem. --- End quote --- Bogs, maybe an arrangement as shown below (top view) with the pivot in the middle of a longer toolholder, would let the thing get close to the chuck. There would be considerable overhang forward of the pivot, though, and consequent leverage. Andy |
| John Stevenson:
Or using a tapered tenon that will hold it secure by the turning forces and do away with any stop screws. Something along these lines will work for RH and LH threads and nothing protruding. John S. |
| Rob.Wilson:
Great Job Bogs :thumbup: Looks like another tool i will have to add to the things to make list Regards Rob |
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