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| Building a New Lathe |
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| awemawson:
Excellent Steve - and the zinc alloy should tap (hopefully) even better. What sort of finish did it leave on the aluminium? |
| vtsteam:
Okay, Andrew, but not as nice as the zinc. I just tapped a leftover zinc mini-muffin ingot from last pour to see what the thread looks like - here's a close-up: And the fit on the rod is pretty darn close. probably because a section of the rod was used to cut the thread. When I screwed one of the three foot rods in, it has only about a quarter inch of side play at the far end with the ingot clamped in the vise. Almost no play at all. But it's also an easy smooth turning fit. Basically it's a custom made thread to the rod. |
| PekkaNF:
Looking good. The way you did the "rake" looks good, I startted think of it and I think that if you make "hook" it will change effective shape of the cut. Me thinks. :scratch: Pekka |
| vtsteam:
Not sure what you mean Pekka. No matter what shape the flutes, the screw can only make its own shape in another solid. A different shape flute relief will affect the ease of cut, only. Commercial taps have radiussed relief cuts mainly to reduce notch sensitivity I believe, so the tap will break less easily. |
| modeldozer:
Well done. Filed away for in case. :clap: :clap: :beer: Abraham |
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