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I want to soften a broken end-mill so I can turn its shank to a combo pilot+countersink form, then re-harden it. The new tool will be used on/in wood for only about sixty holes so I guess it won't have to be fantastically hard. I've tried heating to (fairly bright) red-heat and letting it cool...

Hi, My set-up is: Arduino, loaded with GRBL, driving two Pololu A4988 to my X- and Y-steppers. (I don't have a working Z-axis.) In Windows, I hand-code G-code in UltraEdit (text editor) from my drawings in Xara. then I send the xxx.NC file to the Arduino via...

I'm building an experimental horizontal petrol-engine, incorporating some unusual (?) ideas. I reckon that the power will be very low so I hope to get away with non-full-size materials. The crankshaft is machined from an aluminium casting, with main bearings in ball-races. I would like to try...

I trying to make my own version of a horizontal petrol-engine, in the style of the Amanco etc. With few exceptions, I'm casting everything in aluminium and I'm aiming for a bore: 25mm, stroke 30mm. What sort of sizes would you recommend for 1/ the valves and 2/ the ports to the outside-world...