Morris taper ream...?

[Chris Barnett]

What would a new spindle cost for a 3520B? Should not be a machine killer! Also, Leo, interested in how to use a drawbar on a 3520B...cannot quite see it. Agree with your comments however; the PM is a $3000 (?) machine and the Oneway is, what, $5000...$6000, so hopefully there are some significant differences.

[phil harold]

can some on explain how/what is a draw bar?

[Frank Townend]

At the end of a Morse Taper insert (drive center, buffing system, etc.) that goes into the drive spindle (head stock) or live center (tail stock) there is often a internally threaded section.

To use a draw bar, the first thing you need is a head stock or tail stock that has a through hole. You thread a threaded rod into the Morse Taper insert, pass it through the hole, and use a threaded handle or other such device to keep the insert tightly in the hole.

[Ryan Baker]

A draw bar is not going to stop the center from spinning.

You might try Bill Grumbine's trick of using a two-point drive spur that fits in your chuck jaws instead of on a morse taper for those big blanks. You'll never screw up the taper that way. One wonders about slipping in the chuck jaws, but some of the brands are "guaranteed" to not slip.