blank spinning... help

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old folks

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Jan 3, 2005
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Location
Mt Enterprise, Texas, USA.
I just started having this problem... I normally use pen kits and bushings from woodturninz but I have a few that are cheaper kits. I tighten the the mandrel nut as tight as I dare but the blanks are spinning under pressure... What might be happening ?
Thanks
old folks
 
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old folks said:
I just started having this problem... I normally use pen kits and bushings from woodturninz but I have a few that are cheaper kits. I tighten the the mandrel nut as tight as I dare but the blanks are spinning under pressure... What might be happening ?
Thanks
old folks
Click to expand...


Old Folks, could you explain your sign-on name??? Just curious.

As far as spinning blanks, are they spinning on the bushing or is the bushings spinning on the mandrel??? Could be the wrong bushings are used for the kits you used. because each kit from different suppliers could be a tad different in ID and OD measurements. If the bushings are spinning it could be they are again the wrong bushings for the mandrel size you are using. Some kits they have bushings for either an "A" mandrel or a "B" mandrel. Need to make sure they are matched. Or it could be the bushings are just worn on the ID. I always try to order the bushings for the kits from whichever supplier I buy from and make notes on the plastic bags for future references. Or Ed had a good point also as I was typing using 2 fingers.
 
it sounds like blank is spinning on tube , is glue fresh ? also i have took a larger bit and chamfered the end so the bushing is pressing to the blank and not just the tube
 
Something not mentioned yet , how sharp are your tools ? If your tools aren't sharp you will have to press harder to make the cuts which will make the blanks spin on the mandrel .
 
old folks said:
I use Gorilla glue and it has 24 hours to set up. Could cheap kit tubes cause the spinning ?

old folks
Click to expand...

All tubes will "spin" on the mandrel. They are not supposed to fit tight. The Bushings push against the blanks and keep them from "spinning". The mandrel nut tightens against the first bushing and all else is pressure.

Are you, possibly, using an adjustable mandrel, with the two nuts near the headstock? Those nuts COULD be loose and the mandrel is slipping out of the collet when you turn.
 
John

To me we still do not know what is spinning??? Could you tell us what is spinning that is not suppose to be spinning. I get it that the blank is spiniing but is the bushings spinning with it or is it spinning on the bushings or is the blank spinning on the tubes and the glue did not hold???
 
I know this sounds crazy, but are you sure the live center is very snug AND locked into postion.

OR as Ed says an adjustable mandrel could be slipping?
 
jttheclockman said:
John

To me we still do not know what is spinning??? Could you tell us what is spinning that is not suppose to be spinning. I get it that the blank is spiniing but is the bushings spinning with it or is it spinning on the bushings or is the blank spinning on the tubes and the glue did not hold???
Click to expand...


John, you are ABSOLUTELY correct. But, probably BOTH blanks wouldn't release from their brass tubes, so I (mentally) ruled that out. I could, most certainly be wrong!

Oh, and a 7mm tube is not ON a bushing. So that can't be it.
 
jttheclockman said:
John

To me we still do not know what is spinning??? Could you tell us what is spinning that is not suppose to be spinning. I get it that the blank is spiniing but is the bushings spinning with it or is it spinning on the bushings or is the blank spinning on the tubes and the glue did not hold???
Click to expand...

He said he is using slimline kits which means that the tubes don't go on the bushings , they just press against the ends of the blank . Even if the bushings are spinning it wouldn't matter the tubes are not riding on the bushings , just sandwiched in between them .
I still think it sounds like dull tools not cutting just dragging against the blank causing them to spin , or more correctly NOT spin with the mandrel .
 
Are you certain that the mandrel shaft is not spinning independantly?

Do the bushings spin when the blanks do?

Can you spin the blank with your hand when the lathe is stopped and everything is tight?

Do you turn with one or two blanks on the mandrel? If you turn with two, have you tried it with just one with the same results?

When you say the blank spins under pressure. Are they moving just a little or do you have major spinage?
 
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Well I throw the towel in on this one because I do not know exactly what is spinning that is not suppose to spinning. I do know my head is now spinning though. :smile:
 
It sounds like the locking nut is not grabbing the spacers/bushings. Try adding another bushing before the lock nut, then hand tighten. This should eliminate any play in the blank spinning on the mandrel.
 
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