tools, materials & knowledge for model makers
When cutting threads on the lathe we need to look at the change gears and pitch. The change gears on the back of the headstock that connect the headstock rotation to the leadscrew rotation along with the leadscrew pitch determine the pitch you will cut. The gears shown here on a Hobbymat MD65. The spindle … Read more
Someone commented to me the other day whilst walking around a car museum in the UK that they couldn’t cope with all of the different imperial threads and the array of spanners that you need to work on the cars, metric is so much simpler. This got me thinking. Metric threads are easy to use … Read more
A British system of threads with 47.5° included angle with rounded roots and crest. Even numbers are the preferred sizes. Favoured by model engineers, Stuart Turner models are traditionally supplied with odd numbered BA nuts and Bolts. BA Threads B.A. # Tapping Drill Clearance Drill inches mm inches mm 0 0.189 4.8 0.242 … Read more
The most commonly used type of general-purpose screw thread, one of the first international standards agreed when the International Organization for Standardization was set up in 1947. Metric threads are becoming more common in model engineering, but there are quite a few applications where other, perhaps better scale threads are still used – see our … Read more