Quoting from FWW #27 in Methods of Work:
"To cut perfect wooden threads, immerse the dowel in hot paraffin for
10 minutes prior to threading.  Thread when the dowel is still warm.
The shavings roll out of the die in a neat string, leaving a perfect
thread base".
Never tried it myself, but had difficulties to make a good thread on a
threading metal lathe.  So will try it the next time.

Charles



On Mon, 21 Jan 2019 13:39:52 -0700
Don Schwartz  wrote:

> On 2019-01-21 11:21 a.m., Micah Salb wrote:
> > Folks:
> > I have a screwbox.  I tried to use my screwbox.  I made a mess.
> > The screwbox did not put threads on my cherry spindle-it just made
> > the spindle raggedy and thinner. What goes?  
> 
> 
> Micah
> 
> I suspect your cutter may be set rank, making too deep a cut. It may 
> also be dull or malformed.
> 
> You might have a look here for references: 
> http://galootopedia.com/old-tools_wiki/index.php?title=Wooden_Screws
> 
> Don
> 
> -- 
> A thermometer is not liberal or conservative. - Katharine Hayhoe
> 
> A good row does wonders for raising interest, and to be 'good' a row
> must have something to be said on both sides, and a proper issue in
> the middle." - Rosemary Hill, 'Writing About the Crafts', in The
> Culture of Craft, Peter Dormer, ed.
> 
> Being offended doesn't make you right.
> 
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-- 
Charles Stroom
email: charles at no-spam.stremen.xs4all.nl (remove the "no-spam.")