M33x3.5 Niles ™Mandrel
$19.50 This M33 x 3.5mm threaded mandrel fits the larger Oneway lathes
$26.98 with 2 stub drill bits: 5/16″ and 11/32″ $27.70 value
$30.98 with 2 stub drill bits and 3/8″ tap $32.95 value
This Niles ™mandrel threads onto the head stock spindle and has the unique tapered-cut flute making it the best self-tapping mandrel on the market. It has a 3/8″ x 16 tpi threaded stud that works with just about all the stoppers on the market and numerous other projects: ice cream scoop handles, shaving brushes, pizza cutters, etc. They have a black oxide coating for rust prevention. The neck or step below the threaded stud is 13/16″ diameter which matches the tops of all my stoppers. This mandrel does not use a draw bar. It comes with 2 nylon spacers (a spare because you will lose one!) which are used to help keep the wood from locking on the mandrel as you turn it. Use a 1 1/16″ wrench on the flats to start turning mandrel off the spindle or to hold it steady while unscrewing your finished piece..
*Tip: if the wood does get a death grip and you can’t get the project off the mandrel, put it in the freezer for 25 minutes and it will unthread once the metal shrinks. Also try a little beeswax or soap on the mandrel before threading it into the wood.
The shorter stub drill bits won’t “wander” if they hit a tight wood grain. The 5/16″ is the standard size when threading a 3/8″ hole; the 11/32″ is for dense wood, acrylic and resins.
The Spiral Tap cuts the threads the fastest and cleanest but you do need to drill the hole 1/4″ deeper as, like a regular tap, the threads don’t start right at the bottom.
Check this page: Mandrel Comparison if you are not sure which mandrel to purchase: this page explains the differences and usages. If you are still unsure, call me: 717-486-5232 and I will help you out.
Lathes Specifications: here is a list of lathe spindle sizes and Morse taper if you are not sure.
*Basic bottle stopper turning video (threading the mandrel starts at about 3 min.): Roper Woodturning
Niles original mandrels are only made in Missouri.
If you have any questions, email Carl Jacobson at firstname.lastname@example.org or call 503-939-4565, PST.