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Thread: Ball Centres
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2nd Jul 2012, 11:51 PM #1Distracted Member
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Ball Centres
Is this a crazy idea?
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2nd Jul 2012, 11:55 PM #2Most Valued Member
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Nope,but you arent the first if thats what you're thinking.
Stuart
p.s. I have a book some where thats has a little about them but I dont seem to be able to find it just nowLast edited by Stustoys; 3rd Jul 2012 at 12:08 AM. Reason: p.s.
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3rd Jul 2012, 12:06 AM #3Dave J Guest
Nope, they use ball centres for tapers cut using the off set tail stock method and also the boring head in the tail stock set up.
Dave
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3rd Jul 2012, 07:57 AM #4Senior Member
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Probably not however it would depend on the weight being placed upon the triangle and the material being used.
-Scott
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3rd Jul 2012, 09:34 AM #5Distracted Member
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Thanks guys. I didn't really think I was the first to think of it. Seems pretty obvious once you start offsetting your tailstock. Which I'm doing a lot. But a quick search online found very little. Just a short thread on PM.
Dave, the ones you've seen, where they fixed on one side or a floating ball like my sketch? Below is the pic from the PM thread. But not having a ball turner and not wanting another tooling project, it seems so simple to drill two holes and trap a ball. I also don't really like the way those neck down so much.
Scott, do you think my revision below would be safer?
Stuart if your book ever turns up I would be interested to know what it says. My TAFE book doesn't mention them.
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3rd Jul 2012, 09:47 AM #6Golden Member
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I wonder how hard it would be to get hold of tungsten carbide balls to silver solder into a socket.
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3rd Jul 2012, 09:51 AM #7Distracted Member
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3rd Jul 2012, 09:57 AM #8Golden Member
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Looks expensive, although one is $12.95, I expect you'd need one at least 10mm diameter to give enough strength to stay soldered in place.
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3rd Jul 2012, 11:31 AM #9Golden Member
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Bryan,
1. A photo of a selection of ball centres - can you pick the origin of the threaded shank balls?
2. A John Stevenson photo of ball centres used in conjunction with a boring head turning a taper.
Frank.
Added Later: I tried to replace the John Stevenson set up photo with a larger, clearer version, but can't find out how to delete the photo already in the post. If anyone would like to see the higher resolution photo I will post it separately.
Later Again: Thanks to Stuart, I have been able to substitute the better photo, which now appears below.
Frank.
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3rd Jul 2012, 12:05 PM #10Most Valued Member
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Hi Bryan,
I'll have a look
Hi Frank,
when you go into edit, click "go advanceed" then scroll down a little "manage attachments", there should be a "remove" button next each file name.
Stuart
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3rd Jul 2012, 03:05 PM #11Distracted Member
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They remind me of spherical joints, like you see on linkages, eg car gear shifts.
Added Later: I tried to replace the John Stevenson set up photo with a larger, clearer version, but can't find out how to delete the photo already in the post. If anyone would like to see the higher resolution photo I will post it separately.
And now I'm confused about terminology. Is a large included angle called steep or shallow?
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3rd Jul 2012, 03:31 PM #12Golden Member
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Thanks Stuart. The original photo is now replaced with the higher definition one.
They remind me of spherical joints, like you see on linkages, eg car gear shifts.
Not too sure about the taper description - I think it would be a steep taper, but I am open to correction.
Regards,
Frank.
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3rd Jul 2012, 03:41 PM #13Most Valued Member
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Hi Bryan,
Sorry found one but it adds nothing to whats been said already. There might be another but I dont think it adds a lot more. Of course you'll use a tool that directs most of the cutting force along the bed not across it.
Stuart
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3rd Jul 2012, 07:01 PM #14Distracted Member
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Frank, are the Chevy centres yours? If so how do you find using them? In particular, have you ever had anything get away from you? What would be the approx ball dia? How deep would you normally set them?
Stuart, thanks for that. Don't spend any more time looking.
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3rd Jul 2012, 07:59 PM #15Senior Member
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Hi Bryan,
Safety, as such, wasn't on my mind. I was thinking more along the lines of the stress on the points of the angle(s) which you've addressed in the second plan. Without doing the maths and knowing what sort of stresses will be placed upon the model, it looks a better now-Scott
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