Well done Christopher.

When you're cutting threads, especially when you're starting out and test-fitting the nut each time, keep an eye on the thread outside diameter. In many materials the OD will grow as you make the thread because the flat-topped threading tool raises a small burr that you might not notice. This will cause the nut to not fit even well after you have cut the full depth, the usual result being a very sloppy fit as you have found on your first attempt.

Make a few threading passes then check the OD with a caliper and you'll soon spot any problem. A quick swipe with a flat file as the part is turning will keep it all in check. Using lubricant can go a long way to avoiding it.

Pete.

Next thing We will hear He has completed an AntiKrythera mechanism. Good job, carry on.

Making your first lathe-cut thread is a proper champagne milestone, well done you. Quite hairy the first time you try it what with gear ratios, half-nuts, indicators, and tool-post angles etc.

I wouldn't worry about the wobbly fit, that's how I'd describe DIY store studding!

How did you cut the thread, under power or manually? If under power you'll be aware of the risk of crashing into the chuck which can be bad news! As mini-lathes are tad fast for screw-cutting under power I made a removable collet crank handle for my mine: a common idea, they clamp inside the spindle and give excellent control when you wind the lathe by hand.

Just don't forget to remove the handle before powering up the motor.

Never tried it on a mini-lathe but my preferred method on my bigger machine (thanks to JasonB), is to cut threads with the lathe in reverse and the tool on the backside of the work. Cutting from the chuck outwards means there's no chance of smacking the toolpost into the chuck and breaking the lathe, so you can cut down on tranquillisers and safely use more speed.

Dave

Jib?? I've always pronounced it the other way!! Oh, the shame, the shame!!!

Golf at my corner of the planet.