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| Threading stainless. |
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| AdeV:
You can work out how well the thread dial works in various pitches fairly easily; chuck up some scrap material & turn it so it's turning true; then set a very light cut (0.001-0.002", 0.02-.004mm), get everything turning, then engage the half nuts as the thread dial indication "1" touches the marker (you don't have to be nanometer accurate, the nut will engage only when the dial is in the right place, unless you're way off). Turn a short spiral, then back the tool out & disengage the half nut. back the carriage away from the work, feed the tool back in to the same depth as before, wait for the thread dial "1" to come around again, and repeat. You should find the tool following the same spiral. If it does, try again, but engage on the "2", "3" and "4" of the thread dial. Again, it should always follow the same spiral; or maybe you'll end up with 2 spirals (one for odds, one for evens). If you get the 1 spiral, try again on the 1/2 marks. Now turn the spirals away so you've got clean stock again, change from metric to imperial (or vice versa), and repeat the exercise. If you get random spirals each time, then you can't use the thread dial in whatever range your lathe is set to. It's also worth trying on a few thread pitches, to make sure it behaves the same way no matter what. I ought to try that myself tbh, I've never actually done it on my lathe... |
| Darren:
Here you go ... a swing threading tool .... made a while ago and used quite often ... http://madmodder.net/index.php/topic,2462.msg25986.html#msg25986 |
| Fergus OMore:
I think that someone should do a bit of explaining about this 'Swing Tool' business. Actually it was a 'patent applied for' situation by the late Kenneth C Hart or as he was known in most circles under his his pen name of Martin Cleeve. As far as I can gather Cleeve could not afford to continue the financing of the swing tool and the application lapsed. Nevertheless, he continued to develop the tool and several modified tool holders were published in 'Model Engineer' and finally in 'Engineering in Miniature'. At present, there is a write up and drawings in his 'Screwcutting in the Lathe' and Hemingwaykits is selling a variant which is from castings rather than the fabricated constructions which Cleeve described. For those who want to follow the principle, there is still a set of old drawings on the net in Popular Mechanics. Perhaps it worth adding that Cleeve also published a simple jig to sharpen screwcutting tools in his excellent but sadly posthumous book. |
| NeoTech:
Ahh cool there is some history.. As a swede... This hobby isnt that spread out.. and as somewhat.. "young" guy.. i have no clue of what you just talked about. im guessing some paper and a couple of books i could google down? =) |
| andyf:
There seems to be some confusion arising here between Martin Cleeve's Retracting Toolholder (which requires a lever to be pulled to withdraw the tool from the work) and the Swing-Up Toolholder design shown on this forum a year or so back (which doesn't). The Swing-up is very simple to make; Cleeve's is more complicated. Andy |
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