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Thread: Problem...
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13th March 2008, 09:49 PM #1
Problem...
At the bit of a pen where the wood meets the middle band (on a slimline) If the wood is bigger than the band at one point and smaller at another point... Is vibration the culprit?
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13th March 2008 09:49 PM # ADSGoogle Adsense Advertisement
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13th March 2008, 09:53 PM #2
If you are turning both parts of the blank at the same time on a mandrel, and the bit that is out of round is in the middle, then I would suspect you are putting too much pressure on the mandrel while turning, thereby creating an out of round centre.
If you are not doing that, you could have a problem with your live centre, but then the bit at that end should also be out of round, and probably worse.
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13th March 2008, 10:11 PM #3
Could also be too much pressure applied by the tailstock as well. Bring the tailstock up just shy of touching, then start the lathe up and wind the tailstock up then, it will sound like its vibrating and about to take off but once that sound goes away that is about where you need it. What is happening is the end of the mandrel is flapping against the live centre, but once it makes full contact it stops flapping and it has full support supplied to the mandrel.
Cheers
DJ
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13th March 2008, 10:36 PM #4Skwair2rownd
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Problem
Feathered one, just what sort of live centre are you using? If it's the one you had in last Saturday then I think that that is your problem. Try a Live centre that doesn't look like a volcano but has a simple conical tip.
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13th March 2008, 10:53 PM #5
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14th March 2008, 01:10 AM #6
You need a 60 deg live center. The pen mandrel is drilled out at a 60 angle. A 60 deg live center fits in there snug as a bug in a rug and holds it steady. Your normal woodturning live center has a much sharper angle/point to it so it doesn't fit in there and when you put pressure on it or you have a heavy unbalanced blank on there it can/will move around in the end of the mandrel.
I saw improvement after I bought mine.
I went to a local tool supply store and bought it, just a cheapie for less than $20, it works well.Wood. Such a wonderful substance.
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14th March 2008, 02:03 AM #7
I got a cheap one from Woodworking warehouse a while back - blunt as, and perfect for pen mandrels (and $A15)
"Clear, Ease Springs"
www.Stu's Shed.com
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14th March 2008, 03:18 AM #8
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14th March 2008, 02:35 PM #9Senior Member
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Just my 2 cents worth but it fixed the same problem I had like that. The mandrel is only drilled a very short way in in the end & a pointed live center causes a wobble. Get a drill bit the same size as the hole & drill it 1/8 inch deeper, that way it will find the same size on the center on the point to fit the hole exact. Make sence? After buying 3 different mandrels that did the same crap & drilled & haven't had that wobble problem again.
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14th March 2008, 07:42 PM #10Skwair2rownd
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Wobbles
I think you have your information. Let us know what you've decided and how you get on.
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14th March 2008, 07:45 PM #11Skwair2rownd
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You liked the way I put that?
So where's the greenie Skew?
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14th March 2008, 07:54 PM #12
you think your getting a greeny
www.carlweiss.com.au
Mobile Sawmilling & Logging Service
8" & 10" Lucas Mills, bobcat, 4wd tractor, 12 ton dozer, stihl saws.
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14th March 2008, 10:52 PM #13
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14th March 2008, 11:45 PM #14
I'll buy a 60 degree centre...
Mr Toowoomba Woodworks must love seeing me walk in the door, I always walk out broke
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15th March 2008, 10:19 AM #15Skwair2rownd
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wobbles
**Feathered One- That's called "the real world". I note you have accees to free timber!
**Carl- Yes!
**Skew- Are you the president of the Nose Pickers' Union or just a paid up member?
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