The 1/2 Centre was completed this morning, though much is desired when come to hardening it.  It was my first real attempt at hardening and quenching in water.  The test with a file, as described in some text I read, left some scratches on it.  I’ll try the hardening part again when I completed the entire project.

The “edge” of the 1/2 found.
Centre drilled.
Drilled through 4mm for the Sherline tommy bar.
Only to realize that I’m too close to the edge near the threaded portion. The plan calls for the hole to be 3/32″ which will not be as close.
Using the Sherline’s tommy bar to remove the Centre for deburring.
Photo shoot before milling away a portion of the taper.
Mounted to the Base to hold it in the milling vise.
Milling in process.
Done. I couldn’t go further with the mill as the edge of the Base blocked the endmill holder.
Another look before hardening.
After the first attempt in hardening. I heated the job till it glow and quench it in the little contain of water. I’ve had a hose near by (can be seen behind the torch) to spray water as standby.
If you enlarge the pic, you should be able to see the scratches caused by a file. Hardening not done right? After I completed this part, I saw GeneK’s comment on not directing the flame at the tip.  Wish I read his comment before I started…
While assembling the parts, I realized that the 1/2 Centre threaded portion extended out a little too much into the Base.
The excess was carefully milled flush.
Another attempt at hardening was carried out before putting the parts together. The cap screws provided are a little too long. They’ll have to be shortened in the next session.

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