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Production Sphere Jig (Read 1,316 times)
 
steve rost
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Production Sphere Jig
Dec 7th, 2015 at 5:25pm
 
There was a recent thread on making spheres. At that time I was gathering material to make a new jig. It is now complete. Last winter I made 3 dozen Soren Berger style scoops. I was determined to learn the skew and this was a good skill building project. I eventually completed all the scoops. I was very slow and uncomfortable using the skew. I wanted to make some more this winter. I researched sphere jigs and came up with this one. I just turned the first blank this morning. Worked like a charm. I have a large lathe for the cylinder and a small lathe for the sphere. This old Sears tube bed lathe worked perfectly. I used a EWT diamond point cutter. It left a rough surface but the 3 minutes it took to shape the sphere more than offsets the sanding time. I can do spheres up to 4 inch diameter. Any questions or comments welcome... I AM the Jigaholic!
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« Last Edit: Dec 7th, 2015 at 5:37pm by steve rost »  

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Richard Pyle
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Re: Production Sphere Jig
Reply #1 - Dec 7th, 2015 at 5:57pm
 
do you have measurements/drawings available?
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gary marquardt
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Re: Production Sphere Jig
Reply #2 - Dec 7th, 2015 at 6:17pm
 
I'm presuming  you turn to the  size you want then center the cutter on the  cylinder . then rotate the cutter  right and left.  does it cut all the way to a  finished ball? 
a drawing with measurements would be great if you are will to share that.
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Larry Matchett
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Re: Production Sphere Jig
Reply #3 - Dec 7th, 2015 at 7:56pm
 
An improvement to your jig would be to modify it so you can swivel  the cutter holder.  That will allow you to cut closer to the headstock.  Take a look at the Carter sphere jig.  With just a little mod yours will work well.  I am sure it works well for what you are doing.  Well done.
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steve rost
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Re: Production Sphere Jig
Reply #4 - Dec 8th, 2015 at 9:20am
 
Richard, Gary,  Unfortunately I design 'stuff' in my head.  A key to this system is having the pivot precisely under the center line of the lathe.  Attaching this jig to the lathe was easy because the banjo bolts onto a base that slides up and down the tube bed.  Removing the banjo gives you platform that can lock in any place you need.  Attaching a adjustable base on the ways of a lathe would be a design headache.  Yes, ideally the swing arm would swing inside the head and tail stock.  You would still have to remove waste on both sides of the sphere and you would have a smaller shoulder.  Designing a shorter swing arm or a swivel as Larry pointed out will work too.  For my scoops, the handle needs a shoulder this worked in my favor, of course the 'nose' end of the scoop does not. A few seconds on the  first lathe and it was down where I wanted it.
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Tom Albrecht
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Re: Production Sphere Jig
Reply #5 - Jan 15th, 2016 at 5:51pm
 
Tell me if I am right:

The knob on the outside end of the tool holder advances the cutter?

The knob on top locks down on the tool?

The standing threaded rod with the wing nut at the bottom is the tool rest?

I'd like to come up with something along the idea of the Carter tool that is specific for my lathe.  The Carter is nice, but I'm guessing what makes it so expensive is the adaptability for many lathes.
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steve rost
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Re: Production Sphere Jig
Reply #6 - Feb 1st, 2016 at 8:14pm
 
Yes Tom correct on all three and #4 is a good bet also! My jig was simple because of the tube bed.
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Larry Matchett
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Re: Production Sphere Jig
Reply #7 - Feb 2nd, 2016 at 1:48am
 
No number 4 is not correct.  The carter jig can do spheres up to 2" less then the swing of your lathe.  In my case that is a 14" sphere.  The largest I have done is 4" but am now doing some over 6" for beads of courage boxes.  You an also do the entire sphere except for a small spigot on the headstock end.  That is easily turned off.  You can also twist the cutter to do shearing cuts not just scraper cuts, very little sanding.  I think you could make a jig to do all of that if you have the talent and time.  I would suggest you take a look at the video on the carter site, explains it a lot better then I am.  Yes like all woodturning tools they are over priced but then the volume is probably not that high.
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steve rost
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Re: Production Sphere Jig
Reply #8 - Feb 2nd, 2016 at 8:26pm
 
Opinions are like noses, everyone has one!
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Tom Albrecht
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Re: Production Sphere Jig
Reply #9 - Feb 2nd, 2016 at 8:49pm
 
steve rost wrote on Feb 2nd, 2016 at 8:26pm:
Opinions are like noses, everyone has one!


What does this have to do with it?
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