Mandrel won't stay tight

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Forum topic by JADobson posted 06-04-2013 02:16 AM 1196 views 0 times favorited 4 replies Add to Favorites Watch
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1063 posts in 2134 days

06-04-2013 02:16 AM

Topic tags/keywords: lathe mandrel king ch900c

Ok, this might be a stupid question but I want to make sure that my problems are confined to the one I know about. Anyway, I got a King CH900C lathe from Kijiji (Canada’s craigslist) for $60. Not a bad price in my opinion. The only thing I had on hand to try it out on was a pen kit that I had gotten a while ago to do at my brother’s place. So I put the kit on the mandrel and fire up the lathe. The moment my chisel hit the wood, the wood stopped spinning, the mandrel had loosened. My initial inspection of the machine showed that the threads in the ramlock were hardly there. Once the machine was turned on the ramlock just wiggled loose. So I will need to recut those threads. Is that my only problem? Or could there be something else causing the mandrel to loosen. It is a brand new Lee Valley Large B Mandrel with a Morse Taper #2 if that helps. Thanks for any comments.

-- No craft is very far from the line beyond which is magic. -- Lord Dunsany — Instagram @grailwoodworks

4 replies so far

View SteveKnnn's profile


66 posts in 1912 days

#1 posted 06-04-2013 03:21 AM

Do you have the tail stock up tight and locked?

-- Steve in Richmond, VA

View JADobson's profile


1063 posts in 2134 days

#2 posted 06-04-2013 03:48 AM

Sure do, but as I said, I can’t lock the ram down.

-- No craft is very far from the line beyond which is magic. -- Lord Dunsany — Instagram @grailwoodworks

View Wildwood's profile


2322 posts in 2158 days

#3 posted 06-04-2013 10:23 AM

You lost me not sure, if problem you are having is with your pen mandrel or with tailstock. Don’t think it is a problem with Pen mandrel. If cleaning tailstock does not solve problem here is the manual, maybe able to replace part in tailstock that is causing the problem.

-- Bill

View Kreegan's profile


1452 posts in 2170 days

#4 posted 06-04-2013 12:31 PM

Yeah, not being able to tighten down your tailstock would explain your mandrel coming loose. If you retap the hole for the locking knob, that should fix it I would think. Does your mandrel have a hole for a drawbar? A lot of the better taper accessories are threaded for a drawbar, which would cinch the mandrel to the spindle.

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