The next part I have to make is an airway elbow which is basically two tubes soft soldered at right angles. This was a great opportunity to try out a collet chuck on my lathe, and I have to say “Why didn’t I do this before?!?”. Once the collet chuck was set up (which took a while, removing the four jaw, making a draw bar for it (I need to make a proper nut for it), figuring out how to lock the locking plate (turning the locking nuts around allowed the plate to be held solidly in place), and removing the safety cutoff screw on the apron (since the apron needs to travel further)) its use proved excellent.
I also sped up the spindle, up to 1000 RPM (2000 RPM frightened me too much) and dropped the tool down a little (as described in my Lathe Turning Finish article). This improved the surface finish no end!
The part was then fairly easy to make. Face. Turn 13mm down to 6mm external diameter. File a small chamfer. Center drill and then drill 3, 4, 5mm to a depth of 13mm. Cut off with a hacksaw and file clean.
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