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 Post subject: Lathe-working Query
PostPosted: Mon Jun 20, 2016 3:46 am 
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I know my technical drawings are not terribly good, but what I would like to know, is how
much would it cost me to get this item made in bronze or stainless steel or both?
Is there any hobbyist's around at the moment that could help me out with it?

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Would it be possible to knock out several of these with varying ID's?
What about non metals, like rubber and acrylic, can these be lathed?

IDs: 19.0, 19.4, 19.8, 20.2, 20.6 would be of interest to me right now.

Cheers :)


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 Post subject: Re: Lathe-working Query
PostPosted: Mon Jun 20, 2016 8:20 am 
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Non metals are not tricky if they are solid such as acrylic, rubber (if not vulcanised) is a sold to machine accurately.

What is the purpose, how many do you need and what are the tolerances? Given a reasonable tolerance they would be pretty easy to manufacture, if tolerances are tight though then special tooling would be required such as custom expanding mandrels.


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 Post subject: Re: Lathe-working Query
PostPosted: Mon Jun 20, 2016 8:59 am 
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Purpose is to serve as a jewelry ring specific to chainmaile. The center section permits
a strip of designer maile to be installed. This can then spin by the wearer as a kind of
coping mechanism for stress / anxiety.

The ID size's I provided, are actually Finger sizes.

The outer diameter tolerances aren't all that important, the inner diameter obviously is
a little more important but we aren't talking tolerances of .20 or anything like that, I mean
.50 to .60 is still very acceptable and even being off by a bit more than that is not
a massive point of concern.

I would take on the job of polishing and cleaning them so no need to worry about any of that.

If I could get one set in the finger sizes provided, in a material such as bronze to begin with
then there's really quite a high probability I'll need many more, funds permitting.


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 Post subject: Re: Lathe-working Query
PostPosted: Mon Jun 20, 2016 9:17 am 
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http://proun1919.com/wp-content/uploads ... pers01.jpg

This is the kind of maile one might wrap round the center section, the relatively
low friction between the surface areas should permit the user to twirl the maile
round repeatedly.


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 Post subject: Re: Lathe-working Query
PostPosted: Mon Jun 20, 2016 12:30 pm 
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Ahh ok if its for jewellery then it's pretty easy, concentricity will not be much of an issue same with the tolerances. The only issue I would see is cost if you want to make it economical, solid bronze rod is not cheap and a lot will be wasted. Time wise they wouldn't be too bad if you were making a large batch of each size.


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 Post subject: Re: Lathe-working Query
PostPosted: Mon Jun 20, 2016 4:31 pm 
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Thick wall tube may be a bit cheaper - bronze isn't cheap tho (off the top of my head £40-50+ per meter depending on grade and mix ) - I use fusion 360 if that's a format you can output to - I could 3D print these in PLA/PHA cheaply if you want examples


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 Post subject: Re: Lathe-working Query
PostPosted: Mon Jun 20, 2016 5:23 pm 
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Dont think I want to fork out that type of coin on bronze just
yet then, what about stainless steel?

Hi flash, thanks for that offer, I already have a design
being 3d printed I thought however due to the shape
of this particular design that a lathe worker might
be best.


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 Post subject: Re: Lathe-working Query
PostPosted: Mon Jun 20, 2016 5:52 pm 
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There is a bronze and Brass filament and it does polish up nice with a bit of work - the filament is made by colorfabb and is called bronzefill they also do brassfill and copperfill - its really nice quality

there are plenty of images on google

25mm 303 stainless is around £25-30 a meter retail (solid round bar)


Last edited by flash22 on Mon Jun 20, 2016 5:57 pm, edited 1 time in total.

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 Post subject: Re: Lathe-working Query
PostPosted: Mon Jun 20, 2016 5:56 pm 
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Do you have the ability to print with it?
What is your minimum layer thickness?
How much do you want per ring?


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 Post subject: Re: Lathe-working Query
PostPosted: Mon Jun 20, 2016 6:06 pm 
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Can anyone tell me how much it's going to cost me to turn a meter
of stainless round rod into however many of these rings I can
get from it? I would rather not go near a company, last time
I tried that, they wanted 1000 parts before they would even
talk to me.


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 Post subject: Re: Lathe-working Query
PostPosted: Mon Jun 20, 2016 6:17 pm 
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Can't give a price that easily really. Beware of the grade of stainless, most is really tough to work with on smaller lathes, I avoid it if I can.


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 Post subject: Re: Lathe-working Query
PostPosted: Mon Jun 20, 2016 6:19 pm 
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What about an aluminium bronze alloy?


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 Post subject: Re: Lathe-working Query
PostPosted: Mon Jun 20, 2016 6:23 pm 
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any printer can print the filament - I do printing as a hobby as its a easy and quick way for me to get ideas into a physical object - I usually print in 0.2 or 0.1 but its possible to print down to 0.02 but its slow going you can increase the print time by 30 fold

acetone polishing does work but it can be a bit hit and miss


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 Post subject: Re: Lathe-working Query
PostPosted: Mon Jun 20, 2016 6:54 pm 
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Flash, I have a design for a ring like this intended for 3d printing, though I don't
know if it is technically viable. To cut material costs I hollowed out sections
of the model and split it into 3 sections that snap together. The idea was
to give the ability to mix and match colours.

Would you like to have a go in PLA or something like that?

Image


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