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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'>Richard and all,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'> Follow-up on the copper sphere:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'> I drilled the sphere and did fine. But my first question is what is the proper drilling rpm for copper? Everything I’ve seen on the internet (9/64” drill bit) says 3000 rpm. That just seems fast to me. I ended up drilling at 1200 rpm and did fine (using 3-in-1 lubricant). But should I have used 3000? I will be doing more.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'> I threaded the sphere and a steel rod and screwed the rod into the sphere. I mounted the sphere on the lathe and used the tail stock to start but will eventually have to back off the tail stock. I used an Easy Tool scraper and started to turn the sphere. It was a little wobbly as I’m sure I didn’t hit the exact center of the sphere. When I gently entered the cutter to the sphere I got small chips and a lot of noise (I’m sure because metal on metal and a little wobble). I stopped turning because a 3 oz ball of metal coming off the lathe makes me nervous and decided caution was the better part of valor so I could seek more advice. The lathe was turning around 1200 rpm. Faster, slower? What type of chips should be coming off? The DP created longer wisps of copper and I was hoping for the same at the lathe but probably not realistic. What did cut was very rough. Sound normal so far?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'> I had safety glasses and a face shield on and I know wood coming off a lathe can do damage but when I think of this sphere all I can see is a big bullet </span><span style='font-size:14.0pt;font-family:"Segoe UI Emoji",sans-serif'>☹</span><span style='font-size:14.0pt;font-family:"Arial",sans-serif'>. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'> What do you think? Soldier on? <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-size:18.0pt;font-family:"Brush Script MT",serif'>Chuck<o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> Richard Allen <rla_buy@yahoo.com> <br><b>Sent:</b> Tuesday, March 30, 2021 4:19 PM<br><b>To:</b> woodworkers@sawdusters.org<br><b>Cc:</b> chuck.steger@gmail.com<br><b>Subject:</b> Re: [Woodworkers] Copper metal working<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>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<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><br><br><o:p></o:p></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal style='margin-bottom:12.0pt'>On Mar 30, 2021, at 5:02 PM, chuck.steger--- via Woodworkers <<a href="mailto:woodworkers@lists.sawdusters.org">woodworkers@lists.sawdusters.org</a>> wrote:<o:p></o:p></p></blockquote></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>Hope everyone is safe and healthy!</span><o:p></o:p></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.</span><o:p></o:p></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.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif'> So here are some of my issues/questions/concerns:</span><o:p></o:p></p><ul style='margin-top:0in' type=disc><li class=MsoListParagraph style='margin-left:0in;mso-list:l1 level1 lfo3'><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.</span><o:p></o:p></li><li class=MsoListParagraph style='margin-left:0in;mso-list:l1 level1 lfo3'><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.</span><o:p></o:p></li><li class=MsoListParagraph style='margin-left:0in;mso-list:l1 level1 lfo3'><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.</span><o:p></o:p></li><li class=MsoListParagraph style='margin-left:0in;mso-list:l1 level1 lfo3'><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. </span><o:p></o:p></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.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:18.0pt;font-family:"Brush Script MT",serif'>Chuck</span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>_______________________________________________<br>I want to be one of my friends for a day so I can see how cool it is to hang out with me.<br><a href="mailto:Woodworkers@lists.sawdusters.org">Woodworkers@lists.sawdusters.org</a><br><br>To unsubscribe from this list -<br><a href="http://lists.sawdusters.org/listinfo.cgi/woodworkers-sawdusters.org">http://lists.sawdusters.org/listinfo.cgi/woodworkers-sawdusters.org</a><br><br>Address to contact the list ADMIN staff -<br><a href="mailto:woodworkers-owner@lists.sawdusters.org">woodworkers-owner@lists.sawdusters.org</a><o:p></o:p></p></div></blockquote></div></body></html>