Posted by Wardner on June 24, 2010 at 22:57:08 from (4.154.234.177):
In Reply to: Farmall 450 drawbar posted by danto on June 22, 2010 at 15:58:24:
Tonnage of the press is affected by the thickness and width of the metal you are bending. My splitter puts out 25 tons using a 4" ram at 2000 psi. If you have a 5" ram, you will have about 40 tons at the same pressure.
Tonnage is also affected by the type of steel and and the radius of the bend. The radius is set by the spacing of the blocks attached to the ram. My blocks are set with a 2" space. The radius is tight for that 1" bar. You don't need it that tight. Neither do I but I am still learning. Those two bars were my first experience at machine forming flat bar.
At that spacing, tonnage is also affected by the wedge. I was using a formed angle over the wedge made from 1/8" thick steel. If you look carefully, you will see it in my previous post. Thicker than that is probably better but will need more tons. If you press against a sharp wedge, it will cause excessive marking and weakness on the bar you are bending.
Yes, I had to heat the bar. I wouldn't have had to heat it if the blocks were set to 3", possibly 4". My splitter can bend 1/2" x 3" without heat at the current block spacing.
You will need two offset pieces for your drawbar. The steel below is 5/8" x 3". Again I needed heat but not as much.
When you drill the blocks, put the holes slightly off the vertical centerline so that you can flip them for a different spacing.
Give the bending a try. You will find it is fun and it sure beats a hammer and a broken vise. If you overbend, flip the bar and nudge it gently from the other side. Send us some pictures.
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