Recent content by Monkey

Thank-you very much for your replies. Have got a few ideas in mind now about how to make it work. Best regards.

Hi, I am building a simple pulley for a weightlifting machine. In most cases pulleys are designed to lift heavier loads easier, I want to actually make it harder to lift the load… So I don't have to put so much weight on the end. Can I amend my simple pulley design in a (simple) way to...

Maybe it is just total overkill on these new benches. Look at this old school bench from the 60s/70s when Arnold Schwarzenegger was lifting, and not many people will be lifting weight as heavy as these benches took. Amazing how thin the tube is compared to the current models on post #1

Yes, sorry, good point about the scaling. The overlapping part is actually much larger than the bolt diameter, each bolt is an M14mm and the overlapping metal is 90mm x 100mm. The bolts are also not on top of each other as the picture would indicate, there are 2 on top and one middle below -...

I have been looking at new weight benches recently. Whilst I can appreciate this is not a weights training forum I think the mechanical loads and the equipment designs can best be discussed here, I´d like an engineers professional input. Something that's rather obvious is that as benches get...

EDIT: (M12 are 4890, M16 are 9100KG - I couldn't find data for 14mm).

PS. Also bear in mind the pin sizes you are going to be using! The box section size isn't as important really (as long as using a minimal 2" 11 gauge) as the pin sizes you are using - You will want 1" tube for safeties in reality, and you would then be better off with larger than 2" for the box...

I would use the 3x3 without doubt, especially as you said parts are cheap there. I´d like to know how you intend to make the j-hooks? (Im a weightlifter too, so I know the equipment you are speaking of). You couldn't go far wrong duplicating the ROGUE equipment (infinity or monster lite ranges)...

I had a piece of box section steel tubing, 400mm long, 5 x 10cm section, 3mm thick. It has a foot welded to the bottom which stabilises it at the floor (this is in red). It is a weight lifting bench. I needed to shorten the length, so I cut it in two and overlapped a join, then fixed it with 3...