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In this case I often use a pin of 2 - 3mm diameter "between leather and flesh", drilling parallel to the axis at the junction between shaft and pulley or gear. Easy to machine and good mechanical resistance, but both pieces must be made of steel.

Thanks for your interest. @ Roger: Nice to meet you so far away from our places of life.... while we are almost neighbors. @Christian Glad to know that you appreciate my region. I can't find all my pictures of the 4 cylinders machining, for the moment. I just found these ones. Connecting...

hi Peter, Yes, the test of titanium for valves is based on non-rational arguments like working a metal that has the reputation of being complicated to machine and making a "factory competition" engine like ..... The properties of titanium seem to be well adapted to this use, although I haven't...

Some pictures of my two previous realizations: The four cylinder is of personal design. I didn't know anything about machining before I started it and I think I made all the mistakes I could in design and realization.... a kind of quick training. It simply turns. The single cylinder is built...

Thanks for your interest, @ PeterDRG: my previous job, health facility manager...... nothing to do with machining;)

Thank you for the welcome message. I have started a post for the V8 project. https://www.homemodelenginemachinist.com/threads/72-cc-v8-project.34241/

Project of a mini V8 block that could be used as a base for an RC dragster if everything goes well: Displacement 72cc, 200mm long, flatplane type, 24 bore and 20 stroke. It is planned to have a distribution by 4 OHC, liquid cooling, carburetor or injection and electronic ignition. As I don't...

Hi I'm Bernard and live in area of Landes in France. I am retired now and among other hobbies I machine metal and build small 4 stroke engines. I started with a HQ 500 a multipurpose machine and now I have a lathe and a milling machine. I first made a rustic four cylinder and then a single...