This morning I was threading a number of 10 mm mild steel shafts/rods and ran across the usual problem of finding it very difficult to start and even once I got to going to put the 1.25 mm thread onto these shafts. Yes, I had tapered the end slightly and was using plenty of lube.
I then put the shaft on the lathe and took off 0.1 mm and the die cut the thread much easier. looking at the thread under some magnification I could see the thread was still fully formed.
I don't know how other people go such things but in contrast to the many readily available pre-threaded hole size charts for different size/pitch threads I have never seen charts showing recommend amounts of easing of the diameter before cutting a thread. Has anyone seen one of these?
I then put the shaft on the lathe and took off 0.1 mm and the die cut the thread much easier. looking at the thread under some magnification I could see the thread was still fully formed.
I don't know how other people go such things but in contrast to the many readily available pre-threaded hole size charts for different size/pitch threads I have never seen charts showing recommend amounts of easing of the diameter before cutting a thread. Has anyone seen one of these?
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