Video of Solids of Constant Width

[Jonathan]

They are cylindrical, no i didn't use soft jaws

Hmm, so did you machine them all in one operation? Or are you not disclosing how :naughty: I saw the other thread about it here a while ago.

By cylindrical I mean mine were just prisms. I did it in the lathe by offsetting the center and machining it three times.

i am rolling them using shiny clear perspex which is nice and hard.

Exactly - now use two pieces of perspex. That would be even more impressive.

[FatFreddie]

Hmm, so did you machine them all in one operation? Or are you not disclosing how :naughty: I saw the other thread about it here a while ago.

My approach would be to turn the pointy bit and then basically part off the lightly curved face first roughing a relief down to maybe 10mm dia and then finishing the face and parting off the final 10mm in one go - if you get the tool shape right it should work ok.

Anywhere near? :-)

[Jonathan]

My approach would be to turn the pointy bit and then basically part off the lightly curved face first roughing a relief down to maybe 10mm dia and then finishing the face and parting off the final 10mm in one go - if you get the tool shape right it should work ok.

Anywhere near? :-)

I thought it might be that, but there's no mark at all at the center of the lightly curved face.

[M250cnc]

My approach would be to turn the pointy bit and then basically part off the lightly curved face first roughing a relief down to maybe 10mm dia and then finishing the face and parting off the final 10mm in one go - if you get the tool shape right it should work ok.

Anywhere near? :-)

Maybe, getting warm :lol:

It will make it interesting for those that watch but do not participate in the threads to see how various minds work.

The piece is 48mm diameter and will not go through the headstock of my lathe.

So material cost has to be considered, it is not a secret in how i did it but just a bit of fun not to give the game away too easily. But i will let on if anyone gets close to my method.

Phil

[M250cnc]

Hmm, so did you machine them all in one operation? Or are you not disclosing how :naughty: I saw the other thread about it here a while ago.

By cylindrical I mean mine were just prisms. I did it in the lathe by offsetting the center and machining it three times.


Exactly - now use two pieces of perspex. That would be even more impressive.

Jonathan i have never heard anyone call a prism cylindrical before. :lol:

I would have tried rolling them on two pieces of perspex but as i made them for a customer i can't really get them all scratched can i.

They are on a thick towel as i was using a glass table and didn't want to explain to her indoors about any accidents. :whistling:

Phil

[Jonathan]

Jonathan i have never heard anyone call a prism cylindrical before. :lol:

I would have tried rolling them on two pieces of perspex but as i made them for a customer i can't really get them all scratched can i.

They are on a thick towel as i was using a glass table and didn't want to explain to her indoors about any accidents. :whistling:

Phil

Nor have I heard anyone call a solid of constant width a cylinder, but nevermind - I should have chosen a better word!

They must be aluminum then if there's a risk of getting them scratched.

Still thinking ...

[M250cnc]

Nor have I heard anyone call a solid of constant width a cylinder, but nevermind - I should have chosen a better word!

They must be aluminum then if there's a risk of getting them scratched.

Still thinking ...

Jonathan, Steve Mould called them Constants of Solid Width, i call em thingamabobs.

You are correct in that they are made from Aluminium.

They are very round as you can see from this poor photo, so cylindrical to me. :lol:

Phil

[Jonathan]

Maybe when parting off you held the piece in a revolving chuck in the tailstock. That would still leave a mark, so take that chuck and put it on the spindle and machine the other side? It should still be on center so that could work ... probably something a bit more ingenious though

Possible some sort of turning between centers was used ('save material').

I guess the question to ask is was it all machined in one operation or not?

[M250cnc]

Maybe when parting off you held the piece in a revolving chuck in the tailstock. That would still leave a mark, so take that chuck and put it on the spindle and machine the other side? It should still be on center so that could work ... probably something a bit more ingenious though

Possible some sort of turning between centers was used ('save material').

Very cold. :lol:

I guess the question to ask is was it all machined in one operation or not?

Clues, not every one had the same operations there are some subtle differences, so you now know there is more than one operation. :naughty:

:whistling: I'm enjoying this.

Phil