Actually, seeing your grinder inspired me to get off my butt and post my pics. The air cylinder is indeed a tensioning device. It is fed by a small regulator and in my case it is set to about 20 psi. The idea for the original grinder was discussed on another forum a few years ago. I freely admit to ...

Here is a good reference for cast-iron welding: http://www.lincolnelectric.com/knowledge/articles/content/castironpreheat.asp I have repaired cast-iron by both methods mentioned. From what i see in your pic the method that I would elect to use would be a preheat. Heating in a gas forge or a high tem...

http://picasaweb.google.com/114112791231015606856/BLACKSMITH#5496500844985078226 I finished, well finished for now, this grinder this past year. It is a KMG clone, all the rolly parts came from Beaumont Tool, hard to make them for what he gets for them. Most of the grinder chassis is bolted together...

Interesting project... personally I would use TIG for this. If you are unfamiliar with welding, I would suggest searching your pool of friends for someone who has welding experience and equipment and see some of the processes in action. with those very small cross sections of material mig would requ...

If you are purging the tig weld just continue the purge for the 7018 pass/passes. Once the pipe is completely purged and the root pass is in you can reduce the argon flow rate to almost nothing. Welding doesn't create oxygen inside the pipe and the 'mill scale' is iron oxide. No oxygen... no scale. ...

Those are probably the best reason in world to collect and rebuild old Airco 2 stage regulators and flow meters. Parts are easily available and the are rock solid. My 40 year old argon regulator leaked slowly. After a rebuild it would hold tank pressure with the screw backed out for 3 weeks... it dr...