Elliptical turning device Pt. 2

[@physicsdave5402]

Very cool! I've wondered about how to make a "true" elliptical shape on my lathe, or mill, but have never needed to. Now I have an idea about how I might. Many thanks! Subscribed!

[@shipsofscale]

Wow - an incredible piece of workmanship on all the parts made to create an ellipse!

[@botavictor5832]

Thank you

[@stovepipe666]

Nice job on that well done

[@asdwee4444]

Felicitari Victor. Ai realizat un accesoriu pentru strung pe care nu am mai vazut pana acum. Succes pe mai departe clujeanule :)

[@Nospheratorum]

Epic. Congrats!

[@douglashank8480]

Hi, thanks for sharing your creation with us. I see some real genius in your design!! I can't read the original comment by HentaizerZ, but they may be talking about a thing that caught my attention too. Also, I noticed your reply about Google Translate, and a different comment that mentioned you being from Romania. With those in mind, I'm going to keep my comments as technical, direct, and simple as possible. My intent is to make my meaning as clear as possible, for Google Translate's benefit. If I end up sounding like I'm explaining something to a child, I apologize. (For all I know, you may speak English better than I do! ...But I'd rather over-explain something than leave it ambiguous.) When you're turning the micrometer dial in this video, it looks like you're putting quite a lot of effort into it. Also, when you were fitting together the micrometer-driven slide assembly (back in Part 1), it looked like there was a lot of friction in the sliding mechanism. A micrometer dial is very precise, but its internal mechanism is WAY too delicate to handle the kind of torque that it looks like you're putting into it. (Think of the tiny amount of effort that it takes to make a micrometer caliper's torque limiter click. The fine differential threads found inside the barrel of a micrometer do give you a huge mechanical advantage. However, using it to exert a linear force of more than a few grams will quickly wreck those tiny internal threads.) For this same reason, the micrometer mechanism won't survive very much static load either. These things can be fixed with a little bit of modification to the design. Three changes I would suggest: 1. Adjust and refine the sliding assembly that's attached to the micrometer head until it moves easily, with very little friction. The faces of the dovetails should all be machined (and maybe lapped too) so that they're as absolutely smooth, straight, and flat as you can get them. Any parts that move relative to each other need to have clearance between those parts, so they won't rub against anything. Also, when making adjustments, use your other hand to support the weight of the chuck. 2. Add a clamping mechanism to hold the eccentric assembly rigidly in place while the lathe is spinning. This will support the unbalanced load during eccentric turning operations, so the micrometer head doesn't have to take those loads. Note: Figuring out a good way to do this - while also allowing the assembly to slide freely when it's not clamped in place - may not be easy! Getting the parts to slide smoothly when you want them to will be hard all by itself. Building a solid clamping mechanism that will hold tightly - without warping, gouging, twisting, or otherwise damaging your finely tuned sliding assembly - will be harder still. ...That being said, and having seen how well you can make things, I have no doubt that you're capable of getting it to work. 3. Last, consider replacing the micrometer head. ...If you were twisting it as hard as it looked like you were then, even if the threads aren't completely stripped, they probably are damaged badly enough to ruin their level of precision. If you do replace it, definitely save that for last though, so the new one won't accidentally get damaged while you're getting the slide assembly and locking clamp dialed in. Thanks again for sharing. +1 new subscriber!

[@botavictor5832]

Hi, thank you for your suggestions, I won't be refining this device since it was just a proof of concept (but the next one will take all this in consideration) regarding the force needed to turn the micrometer, it was not coming from the slides (which can be adjusted easily) it was in fact the captive end of the rod that was too tight Yes, a lock for the cam slide is welcome and will take most of the forces of the screw (I was planning to add something like 2 gib adjuster screws to one of the brass dovetails) but cut a few corners due to the project taking to long to build and wanting to actually use it. Another thing which I noticed only after use was that the chuck should be rotated 45deg to align the work with the 2 axis of the ellipse and also the jaws (very had to center an ellipse @45 deg) Regards

[@tat2joeelliott]

where did you get that sine vise? lemme guess you made it

[@botavictor5832]

That's a Fribosa vise and sine table (bought not made)

[@rodolfogilvanfantim2822]

Sr Vitor , meus parabens, a 2 meses tento comprar esse ferramenta ou asseçorio ou ferramenta , como queira, e não consigo achar uma loja que me venda . __ Eu iria usar para um torno de trabalhos em madeira ., faço trabalhos em madeira , sou um artesão. __ Se tiver ou conhecer uma loja que venda esse ferramenta pra que eu adapte no meu torno, ficarei imensamente grato. __ mesmo assim , meus parabens , um lindo trabalho , de muita atenção e paciencia, parabens.

[@botavictor5832]

thank you, unfortunately I don't know of anyone to build something like this commercially (that's why I built my own)

[@John-zo4wu]

Very cool! Do you have an application in mind?

[@botavictor5832]

Ofc, it's for ornamental turning, I'll make something with it next time

[@HentaizerZ]

Жёсткость сильно просела с этой приспособой. А ещё резьба в микрометрических головках не силовая, лучше фиксировать смещение в обход этой резьбы.

[@botavictor5832]

there is always a rigidity compromise with any addon, I don't understand your comment about the positioning micrometer (maybe google translate got it wrong) the micrometer is lockable and does it's job well (as you can see the results are very good) this was never meant to be run under power, just be hand driven.

[@iona198]

Точно! теперь не сможет по стали тупым резцом за проход по 5 мм снимать. Может стоит выяснить для каких задач приспособление?

[@LikeFactoryMade]

I see you are from Romania, which county? :D

[@botavictor5832]

Cluj country

[@bussi7859]

Concept error

[@botavictor5832]

pls be more specific