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Just an update, I have finnished making a prototype in inventor professional and it looks good and is blue when a safety factor is used. I may adjust the sheave size a bit if I can get a bit bigger steel round bar. First stress test to 10t went okay a bit more red than my liking in the first...

I am an assistant consultant arborist and only work in the school holidays so, I am only going to have a few pruning jobs for friends and family each year and as pulleys cost $200 and up in AUS. I thought that it might be cheaper to make my own as I do metals and engineering at school.

I was just wondering if their are any safety concerns with making a lowering pulley? I am thinking of using 6mm mild steel plate for the sides, 45mm round bar for the bottom pulley wheel and 30mm for the top. I was thinking of using 19mm mild steel axil. I was going to design it in CAD and then...