The first couple of dumbells were made from an old conveyor belt roller that i cut into pieces for the "bells" and i would cut the steel into circles and spend ages getting a perfect fit inside the bell.Then i realised that a 8"diameter circle of steel 1"thick weighed the same as a load of scrap pieces put together like a jigsaw,and i used the metal filings as "grout" inbetween the pieces to fill all the gaps in.I just made chalk marks 1" apart inside and put the scrap in up to that level,then put it on the scales to weigh it,and as long as it was getting heavier by the same amount each inch i could work out what the final weight would be.I`ll take some pics of the other dumbells i`ve made with an unconventional design tommorrow.
