Help Please

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Papo

Member
Joined
Nov 18, 2010
Messages
220
Location
Winter Haven, Fl.
I just received a shipment of pen kits and 2 mandrells.The problem is once I installed the brand new mandrells on my lathe they wobble.Question...
Is there any way I can try and straighten them out.I have a mandrell saver on my Tail stock and my lathe is pretty well straight with a max of .004 round out at the head stock.So I know the lathe is not the Issue. I would hate to return these parts and have to wait another couple of weeks.

Thank you for help.........
Be Bless
 
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Penultimate

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Joined
Aug 22, 2010
Messages
1,099
Location
Bartlett, IL 60103
Hi
How far out is the mandrel? Also, try checking runout at 90 degree increments. Changing the position of the mandrel may cancel out the headstock runout.
 

RAdams

Banned
Joined
Apr 5, 2009
Messages
2,983
does the headstock and tailstock line up perfectly? If not, then that will cause some wiggle.
 

MobilMan

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Joined
Mar 30, 2008
Messages
676
Location
Safford, Arizona, USA.
Install the mandrel & bring the tail stock up real close. Turn the wheel by hand & bring the end to it's highest point. Wobble to the top, then use the side of your hand and bump it down a little. You can get it almost perfectly in align this way. Another thing--you may need to drill the end of the mandrel a little deeper. You do not have to have a 60 deg live center, but the mandrel is not drilled deep enough for the small point to go in without bottoming out. Irregardless what degree of taper the mandrel has, the tailstock point will automatically center itself.
 

PenMan1

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Joined
Jul 8, 2009
Messages
6,380
Location
Eatonton, Georgia
It is really easy to tell if the problem is the taper or the mandrel. Roll the mandrel along a flat and level surface (like a counter top). Regardless of how slight the bend, you will see it as the mandrel rolls. If you see no wobble, the culprit may very well be a dirty taper.
 

hewunch

Member
Joined
Aug 5, 2008
Messages
4,657
Location
Albany, GA
Are you getting the mandrel saver past the threads on the mandrel? It has to be on the solid part to keep from wobbling.
 

DurocShark

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Joined
Jul 26, 2008
Messages
3,622
Location
Anaheim, CA
I've found in all of my lathes that the morse taper end cannot be simply shoved into the headstock. I put it in loosely then use the tailstock to seat it, holding the mandrel against the live center on the tailstock (in your case, the mandrel saver) as it presses it in.
 
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