sgimbel
Member
I just got my PSI mandrel and I thought it would tap the wood also. So do I need to get a tap also or will it thread wood/acrylic?
PSI BS mandrel
- Thread starter sgimbel
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PenMan1
Member
It will "kinda" thread into wood, but PR and acrylic needs to be tapped. 5/16th drill bit and 3/8 x 16 tpi tap.
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Sylvanite
Member
The bottle stopper mandrel can be forced into soft woods, but it'll be a snug fit and you might run into difficulty getting the stopper off. It's better to tap the hole first.
Regards,
Eric
Regards,
Eric
TellicoTurning
Member
I don't tap the blanks, just screw them onto the mandrel... I think I do use a drill bit just a hair larger than the directions call for... and I have had difficulties getting some of the finished turnings off the mandrel... not often though.
KenV
Member
threads are either 1/4 by 20 or 3/8 by 16 -- Andy -- had to correct your cross over on thread count. Most are the 3/8 thread
I like the Ruth Niles setup as she machines the mandrel to be able to cut threads and sells one of the better stopper designs
I like the Ruth Niles setup as she machines the mandrel to be able to cut threads and sells one of the better stopper designs
PenMan1
Member
Thanks, Ken! I have two "screw" mandrels. You are exactly correct! The BS mandrel is, in fact, 3/8 x16.
The bolt that I insert from the rear of my Beall collett chuck is the 20 tpi. I think I'm getting "old-timers" disease. I can't remember what I use for what. My 3/8 x 20 "bolt" is what I use for shaving brushes because I can let the blank "stick out" more.
Thanks for the catch!
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Sylvanite
Member
A little bit of paste wax either on the mandrel threads or inside the blank hole will make it easier to get the finshed stopper off. Just be careful not to get any on surfaces you'll be applying a finish to. Also, be aware that the Ruth Niles stoppers are smaller in diameter than PSI's mandrel. If you want a flush fit, you'll have to switch mandrels or get creative.
Regards,
Eric
Regards,
Eric