Here is a basic project for the lathe, a nicely turned bottle stopper.
I wanted it to have these features:
1, 90mm length
2, Three ‘o’ rings
3, A matching nub at the end, minus the o rings
4, A good surface finish
There are several techniques required.
Turning a taper via the compound rest method, parting, drilling, tapping, grooving.
On to the project!
Firstly I put a bit of one inch diameter aluminium in the chuck then centre drilled it, I then drilled it 4mm and tapped it M5. I drilled it 4mm however the correct tapping drill size is 4.2mm but my 4.2 mm drill was hiding somewhere.
After that was done I put a live centre in and turned the outside diameter to 24.5mm
Once I’d done that, I cut a groove into the “thin” end. I did this so that I wouldn’t have to worry about having to really keep an eye on where the tool was. I then marked a line approx 10mm from the “thick” end to show where I would end the taper.
I then set the compound rest using my protractor set to 4 degrees.
I was ready to start cutting the taper. I did the first few passes by hand, and once i was happy I used my cordless drill (set on low-speed) with a 5mm hex bit in the compound rest hand wheel.
I finished the taper by keeping the saddle in the same place, using the compound slide to cut the length of the taper, and cross slide for the in feed.
I then parted it off at the thin end making sure that i had taken the revolving centre off.
I flipped the part in the chuck and grooved the part for the o rings.
That was the main part done.
Next came the nub.
I drilled and tapped two half-inch aluminium rods M5, then screwed them together and put them in the chuck.
I parted off the excess then I turned the outside using a slow feed, then started to cut the taper.
I then screwed it in to the hole in the main body to finish it.