Thread: First oval turning (try out)

Very interesting and instructional!

The shape you are cutting and your video suggests you have a couple of vibrational harmonics flexing the structure. You might want to try other RPMs and strengthening the structures and you should get closer to true oval or is elliptical?

YOU NEED TO HAVE EAR PROTECTORS WITH ALL THAT NOISE Oh its stopped now peace and quiet thats nice Like to see it being worked on and a finished piece, good luck, interesting LB

Originally Posted by BobL

Very interesting and instructional!

The shape you are cutting and your video suggests you have a couple of vibrational harmonics flexing the structure. You might want to try other RPMs and strengthening the structures and you should get closer to true oval or is elliptical?

It was the first run after assembling, I know that I have to do refining work, like solving some problems with margins, some are to big.
Running with 733rpm is not neccesary, but for the first run it's nice to know how fast that thing can run, and 733rpm is pretty fast for such a device.
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Originally Posted by littlebuddha

YOU NEED TO HAVE EAR PROTECTORS WITH ALL THAT NOISE Oh its stopped now peace and quiet thats nice Like to see it being worked on and a finished piece, good luck, interesting LB

Hi LB, nothing wrong with your ears , wish I had timing belts ( to expensive), better for your ears I have to admit, well it's not a Rolls Royce, somewhat more like a Trabant.
Actually I made it all with what I had in store, included rollerchains and rollerbearings, and with my bare hands, so I had not a machine shop for making parts.
So the sound you heard was for a big part from the rollerchains, I sprayed the rollerchains with teflon, so less noise than before.
Runs now with 430 rpm, enough for cutting. Still I have to solve some problems, of course.
Thanks for your attention.
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Hi keep going with it never know how far something can go, and what you might come up with, if it works it works then you refine it, good luck keep us up to date im interested. cheers LB

Ad, you're amazing! Looks interesting to me! Keep us abreast of the progress!

It works!!

Hooooray! Very well done, Ad. And a much more orderly drive train than the Old Schwamb Mill, I think. IIRC, theirs is quite noisy too.

Joe

This device seems to be chain driven. Is it your own design? I have been playing with oval turning on and off for about now for about 4 years. The "chuck" I use is based on the design used by David Springett, and some pictures from an old woodturning book. My experience was that 500 - 600 was a good speed to work at. At lathe centre level there is a 'sweet' spot where tools make contact with the spinning timber.
Jim

You'll let us know when you strike oil, won't you?

I'm impressed! Now for the fine tuning.... that's the part that chews up years. [sigh]

Originally Posted by powderpost

This device seems to be chain driven. Is it your own design? I have been playing with oval turning on and off for about now for about 4 years. The "chuck" I use is based on the design used by David Springett, and some pictures from an old woodturning book. My experience was that 500 - 600 was a good speed to work at. At lathe centre level there is a 'sweet' spot where tools make contact with the spinning timber.
Jim

Yes, it is my own design and rollerchain driven, well I turned the first ''oval'' as a test, looks nice, but I'm not fully satisfied with the result.
Have to do refining work, reducing margins, an extra tension roller on the rollerchain transmission, and a couple of more things.
I think you are right by saying 500-600rpm is a good speed for cutting.
Thanks Jim

Originally Posted by Skew ChiDAMN!!

You'll let us know when you strike oil, won't you?

I'm impressed! Now for the fine tuning.... that's the part that chews up years. [sigh]

Thanks ChiDAMN, Yes fine tuning will takes me a lot of time, I know.
But I'm an old guy, hmmm almost 68 in July, I'm a very patient person, so I take the needed time.

can we see a picture of the first piece off the lathe please
Toni

Originally Posted by lubbing5cherubs

can we see a picture of the first piece off the lathe please
Toni

Hi Toni, first I have to do some refining work, needed to be done after the first try, before I can turn a real piece.
Than I think I can turn the first real piece, and show it to you.
Thanks for your attention.
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