This last week I did some weld etching. The local EAA club has a nice Buehler three wheel grinder/polisher. Myself and another instructor are now looking for a Buehler or comparable grinder/polisher for the high school shop. I've been trolling Ebay and it's clear they are not cheap.Buehler Ecomet 3https://www.ebay.com/itm/363690705839Buehler Polimet (this is similar to what the EAA club uses)https://www.ebay.com/itm/363711444055Because the process is so simple does anyone have experience hand polishing without a machine? Any recommendations?We etched a few samples. A weld and some aluminum bronze we alloyed last year when we cast belt buckles.
Reply:weldingtipsandtricks.com and weld.com both have videos showing how they do it with air grinders and roloc wheels. They seem to get pretty good results.Miller Multimatic 255
Reply:
Originally Posted by Louie1961
weldingtipsandtricks.com and weld.com both have videos showing how they do it with air grinders and roloc wheels. They seem to get pretty good results.
Reply:The Buhlers are industrial grade for sure, but you can polish just about any way you like. I have used them in metallurgical sample prep labs before. Sandpaper glued to a glass or steel plate will do it. Just work your way up the grades, and go as far as you want. But doing it by hand like that is very time consuming (though it sounds like you may want that here...). The addition of any power tools to this will help. The more you polish the better the detail you see, but that depends a lot on how much detail you really need to see. A hybrid way to shortcut the time is to do something on a disc sander to start and get you along the way quicker, and then you can finish the higher grits by hand on the sandpaper strips. You might need to experiment a bit on the disc sander to find a grit that is fine enough but not too fine to do the initial cleanup and move you along the path quicker.-DaveXMT304 with: 22A Feeder, or HF251 Hi Freq DC TIG air cooled
Reply:I polished the top of one of my rail road anvils after doing some rather coarse grinding on it. After the fine grinding wheel on the bench grinder I switched to the RO air sander.... went from 80 to 120 to 180 to 220 and 360 grit. The orbital cleaned it up a lot faster than I expected... it really didn't take that long at all. I think I hit it with the wire wheel after the 360 for shine but a buffing wheel would have been better. I guess this is the modern equivalent of what I have ... it's a Sioux and 40 yrs old. https://www.motionindustries.com/pro...21;origin=saytLast edited by whtbaron; 1 Day Ago at 12:42 AM.The harder you fall, the higher you bounce...250 amp Miller DialArc AC/DC StickF-225 amp Forney AC Stick230 amp Sears AC StickLincoln 180C MIGVictor Medalist 350 O/ACut 50 PlasmaLes
Reply:The problem with this type testing is hard test weld on parts. This why you see Xray used or unisonic testing of welds.There other types of testing but only work on small parts.Dave
Originally Posted by whtbaron
I polished the top of one of my rail road anvils after doing some rather coarse grinding on it. After the fine grinding wheel on the bench grinder I switched to the RO air sander.... went from 80 to 120 to 180 to 220 and 360 grit. The orbital cleaned it up a lot faster than I expected... it really didn't take that long at all. I think I hit it with the wire wheel after the 360 for shine but a buffing wheel would have been better. I guess this is the modern equivalent of what I have ... it's a Sioux and 40 yrs old. https://www.motionindustries.com/pro...21;origin=sayt
发表于 2022-2-15 15:51:40
