<div dir="auto">How about a homemade extruder?</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Mar 30, 2021, 5:23 PM Jason Beam via Woodworkers <<a href="mailto:woodworkers@lists.sawdusters.org">woodworkers@lists.sawdusters.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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I like this suggestion of drilling on the lathe a lot more. The
grabbiness of the copper is a lot less of a factor when you're
feeding with the tailstock of a lathe. <br>
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<div>Jason Beam<br>
<b><a href="https://beamerweb.com" target="_blank" rel="noreferrer">Beamer's Brands</a></b><br>
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<div>On 3/30/2021 2:18 PM, Richard Allen via
Woodworkers wrote:<br>
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<div dir="ltr">I have turned copper on a wood lathe before. I
would take a 7/8” rod about 2” long an turn a sphere at one end.
The end being held by the lathe could be turned down to a
suitable diameter so the sphere would be attached to the rod as
a single piece of copper. Another option would be to drill and
tap the 1” sphere and thread some of your 3/8” rod to screw into
the taped sphere. Copper drills fine. Plan on discarding the
drill bit as sometimes the copper will “weld” to the drill bit.
I would do the drilling with the 1” sphere in a chuck on the
lathe. I would turn down the 1” sphere by mounting the 3/8” rod
in a chuck on the lathe. Copper turns with a scraper. It is a
fairly slow process but 10 minutes of scraper work and 15
minutes of sanding and polishing should give you a sphere shape
to your likening</div>
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<blockquote type="cite">On Mar 30, 2021, at 5:02 PM,
chuck.steger--- via Woodworkers
<a href="mailto:woodworkers@lists.sawdusters.org" target="_blank" rel="noreferrer"><woodworkers@lists.sawdusters.org></a> wrote:<br>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Hope
everyone is safe and healthy!<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif">
I need some advice on working solid copper. I’ll give
you some context on what I’m doing.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif">
I designing and building a Heritage Box for someone.
Everything that goes into the design and construction
will have some elements from their cultural background.
Their mother and grandparents lived and worked in a
copper mining town in Chile and copper was a big part of
their lives. To bring copper into the design, I will
attach the legs to the box using copper rods. Since the
legs taper, I will use 1/8”, 3/16”, and ¼” rods and
leave a ¼” gap between the legs and box. But this is
subtle and I wanted to add something else. So I want to
add a copper sphere at the top of the box. I drew up the
design full scale and the sphere looks good at ¾”. So, I
started researching copper spheres and what I found are
jewelry spheres ½” and less or solid spheres 1” and
greater. I ordered the 1” spheres which are actually
used for plating copper.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif">
So here are some of my issues/questions/concerns:<u></u><u></u></span></p>
<ul style="margin-top:0in" type="disc">
<li style="margin-left:0in"><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Is
there any way possible to reduce the diameter? I
thought about some kind of holding contraption on a
lathe and then using files but that just sounds like a
bad idea.<u></u><u></u></span></li>
<li style="margin-left:0in"><span style="font-size:12.0pt;font-family:"Arial",sans-serif">The
sphere weights in at 3 oz. Now that may seem light but
it’s a little heftier that I wanted because I don’t
want it to tip the box over when hinged open. The box
footprint will be 8”x12” so it may be OK. I will build
a prototype as I always do so I’ll find out. Also with
a prototype it will be easy to see if 1” is too big. A
¾” hollow sphere would be perfect but I can’t find
that.<u></u><u></u></span></li>
<li style="margin-left:0in"><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Will
solid copper drill OK? I would like to drill a hole
for a rod to anchor the sphere to the box. I will
epoxy the sphere to a cradle but a rod would be so
much more secure IMO. And, given the weight, I would
feel better.<u></u><u></u></span></li>
<li style="margin-left:0in"><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Here’s
another take …. Is there a way to cut the sphere in ½”
I only have WW bandsaws so even with a metal blade, WW
bandsaws run too fast, don’t they? The thought process
here is maybe I take the two half spheres and attach
them to the side of the box as an adornment. The
design will be mostly Asian so spheres might look
good. <u></u><u></u></span></li>
</ul>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif"> So
you can see the design is in total flux. I’ve started
building the prototype out of pine.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span>Chuck<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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