Hi folks, first thread from me.
For those of you who have read my hello thread, I`m a complete newbie when it comes to turning on a lathe, the only experience i have is from my own attempts.
My first project requiring any form of precision was/is the rollers for my malt crusher. I made the roller surface out of thick walled steel piping, roughly 45mm OD. For the axles i cut stubs out of 40mm round steel, which i welded in place on the pipe(crash course in welding ). Then i turned down the round steel to 20mm, or at least that was the target diameter. The resulting axles was all in between 19.3 and 20.7mm, how do you make these things really precise? I mean, i do understand that i have to use the markings on the handle, but i cant seem to figure it out anyway
Next is the surface finish, it is what i would call pretty good, but far from perfect. I have ground the HSS bit so it is sharp enough to easily shave my nails, using roughly 10degrees clearence on all sides. Also a small positive back rake angle. Height is adjusted so that the tip of the cutting bit is centered on the part. How do you guys get that mirror shining surface? Polishing?
For cutting speeds i use 240rpm on 40mm, then increase to 320rpm when closing in to 20mm, is that ok? The chips come out without discoloring on thin cuts, and on thicker cuts(about 1/4 mm) it turns deep blue.
Thats all i remember atm, feel free to give more tips and tricks, i do need them
Thanks in advance,
Kim
For those of you who have read my hello thread, I`m a complete newbie when it comes to turning on a lathe, the only experience i have is from my own attempts.
My first project requiring any form of precision was/is the rollers for my malt crusher. I made the roller surface out of thick walled steel piping, roughly 45mm OD. For the axles i cut stubs out of 40mm round steel, which i welded in place on the pipe(crash course in welding ). Then i turned down the round steel to 20mm, or at least that was the target diameter. The resulting axles was all in between 19.3 and 20.7mm, how do you make these things really precise? I mean, i do understand that i have to use the markings on the handle, but i cant seem to figure it out anyway
Next is the surface finish, it is what i would call pretty good, but far from perfect. I have ground the HSS bit so it is sharp enough to easily shave my nails, using roughly 10degrees clearence on all sides. Also a small positive back rake angle. Height is adjusted so that the tip of the cutting bit is centered on the part. How do you guys get that mirror shining surface? Polishing?
For cutting speeds i use 240rpm on 40mm, then increase to 320rpm when closing in to 20mm, is that ok? The chips come out without discoloring on thin cuts, and on thicker cuts(about 1/4 mm) it turns deep blue.
Thats all i remember atm, feel free to give more tips and tricks, i do need them
Thanks in advance,
Kim