Drill mount/jig is mounted on cross slide and I am setting it square to axis of lathe.
I have a straight piece of rod in the drill chuck and using a square to adjust my drill holder on the cross slide.
That's a 40 tooth gear so I have marked the pulley boss to coincide with every 10 th tooth.
I've used this simple method on one of my other pages to lock the spindle. The little jack doesn't have to be tightened much to effect a good lock.
This is a speed controller, I put it together about 6 or so years ago from a kit by Dick Smith Electronics Australia. The same Dick Smith that flew a helicopter over the north pole a few years ago. The circuit is based on one published in Silicon Chip in September 1992. It will control motors up to 5 amps at 240 volt, so about 1200 watt brush motors. Only thing I have replaced in it was a diode, the original was rated 6amp 400v, I replaced it with a 6amp 1000v.
The electric drill is a two speed gearbox type so with the controller I can get a wide range of speeds. Here I am centre drilling . This part is a die holder.
After centre drilling I drilled with a couple of different sized drills working up to the final drill size.
I have finished one hole here and have indexed around 90 degrees, ie 10 teeth on the spindle gear. This part is the tap holder.
Another view, I have the keyless chuck (the black one) locked on to a piece of rod in the lathe chuck.
Here's what the tap holder looks like mounted in the bronze bush in the tailstock. At the left end you can just see a small tap in the chuck. The chuck is a Rohm keyless, the sleeve with the arrows on can be moved to lock or unlock the chuck.
That piece I'm holding is my home made box square, it's just a piece of Aluminium angle. When held on a cylindrical surface it's easy to run a line along in line with the hole at the far end.
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