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Hi All. Great forum. I am trying to write a spreadsheet to tell me a combination of available gears to put in a gear train given a desired gear ratio. The setup will be a compound gear train. I will write a different program to try and solve for 3 gears, 4 gears (common lay shaft). I am...

Hi All, What a wonderful site this is! Thanks for being a great community. I would like to make a permanent magnet at the end of a piece of 4130 hollow bar about 1/2" OD. Is it possible to make a reasonable permanent magnet on the end of this tube? I have no idea of how this would be...

Hi, Can someone inform me on how hard I can make 4130 bar? How is this achieved best? I need to harden the end of a 3/16" rod so that repeated striking on the head of a nail does not deform it. Should I be using a different material like 4140? Regards, Iain.

Hi. I am after a hollow bar with about a 5mm bore and something around a 15mm OD. Can anyone suggest who makes such a product as hollow bar stock? Preferably in a higher grade than mild steel. I am also looking for a steel rod in about 5mm that is not mild steel. Something like 4140 might...

Hi Guys, I am sure this is a simple question for those in the know. I am doing a one off job that requires mig welding of aluminium. The welding is fine but I want to clean them up, but mostly the black soot like surface that surrounds them. I know I can wire brush it with a hand stainless...

Hi All, I am after some specific advice on post weld treatment of stainless steel. I am stick welding 304 S.S. plate (3mm) with 316 electrodes. I want to pickle and passivate these parts. I have access chemicals to make up my own solutions etc and would like to do so. I think I can...

Hi, I am looking for a material to use as a seal. It needs to slide very easily over PVC (machined pipe) and I am having a hard time finding something to do the job. Is there a resource page that might indicate friction coefficients for various rubbers and polymers (I assume against a standard...

Hi All, I am new and posted previously but not sure if it was clearly posted. I am looking for some advice on material and treatment to make 25mm pins out of that are loaded in shear on a tractor driven mulcher. Below is some pictures of previously failed pins. I have a standard machine shop...

Hi All, FIrst timer here, great site! I am after your suggestions on what steel to make 25mm pins out of for a large tractor mulcher. The pins are 25mm round with a head on one end and a split pin in the other. The old pins are case hardened I think (or flame etc) as a pin punch doesnt touch...