Problem with remounting

**Mobyturns** · 12th May 2015, 09:01 AM

This comes from the Nova chuck manual

"Attaching Jaws -
To mount the jaws to the Supernova chuck is another easy process. Firstly wipe clean all jaw slides making sure a clean contact will ensure. Repeat this with all four jaws you wish to attach. Jaw slides are numbered one to four and have a corresponding jaw – of the same number. Place a jaw on its correct jaw slide and position into the groove (location ring out from the jaw into the groove of the jaw slide). The first few times you may need to GENTLY tap the jaws into the locater slot with a block of wood or plastic mallet. Place M6X6 countersunk screws in jaws and screw them on finger tight. When both screws are in, nip them up and back them off half a turn. Repeat this for the remaining three jaws, now using the 8mm T bar Allan key scroll all jaws towards middle until they all come together. Now with all jaws touching and exerting equal pressure on each tighten all screws up. This will ensure a perfect run out. Check to see there areno gaps between the jaws if this has happened it will probably be due to a jaw being placed on the wrong number (e.g. a #2 jaw on a #3 jaw slide)"

**powderpost** · 12th May 2015, 12:01 PM

I really do wonder sometimes if it is wood turning we are talking about or are we in fact machining parts for a car engine. Does it really matter if the wall thickness of a bowl varies slightly? Who is going to notice when the bowl is finished. Enjoy the pleasure of wood turning. Admittedly if you are aiming for a 2mm wall thickness, there could be a problem.

Jim

**joe greiner** · 12th May 2015, 02:44 PM

Originally Posted by Skew ChiDAMN!!

...and I've found there's always a little bit of misalignment no matter how accurate I think I'm being.

I've come to accept that after reverse mounting I only tighten the chuck enough that it just grips the piece firmly, then turn the lathe by hand, taking note of how the piece is misaligned. Loosen the chuck slightly, thump the piece with the heel of my hand to nudge it in the appropriate direction, retighten, rinse & repeat until everything is hunky dory.

With practice it's now only a matter of 30 seconds or so with even my most badly remounted pieces!

Plus one for this method.

Misalignment is easier to detect if you gently hold a pencil near the rim so that it touches only at the extreme runout. That's where you thump it. Choose a different location from the rim for subsequent trials. Erase all by sanding.

Cheers,
Joe

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