15414Vice screws ?
- Nov 12, 2012For some reason large wooden vice screws have always fascinated me so I decided to make one using more or less hand tools. Minor diameter 2", major diameter 2.5", pitch 1/2" for a 2 threads per inch.
For background research I have the Fine Woodworking article from the spring of 1977 and the Woodwright's workbook article. Both use a more or less the same process. The special tap to make a nut, then use that nut to make a screw box.
Also as a comparison I have a 1.5" with 6 threads per inch tap so I can compare that with the one I making.
Progress so far I have made the special nut along with the tap, I have made several large wood nuts, the scraping process is a little slow, but after about a half hour I have a 2" thick ash nut.
I'm about to attempt the screw box part. I'll admit to cheating here a little bit I used a power angle grinder and dremel to make the cutter out of M2 tool steel since I'm not able to harden steel. So the result is a pretty large cutter that is pretty sharp.
One of the notes from the woodwrights workbook is that making a tap for things over an inch and three quarters might require a second cutter.
Has anyone attempted this before ?
Do I need the second cutter or can I get away with one cutter ?
I don't have access to green wood that I can partially season to make it easier to thread. The fine woodworking suggests that, but warns that could end up with checked threads.
As a side note I have tried to manually cut the threads with a chisel, but I think I made a mistake in the pitch, I used the same 1/2" spacing layed out on the major diameter. So my mental math says this will not work quite right. I could make it sloppy enough to work but that is a pain to do so I gave up and want to make a screwbox to match the pitch on the nut exactly.
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