SA200 won't run certain grinders

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I have a 1958 SA200, runs and welds great!  I can run all my dewalt 4 1/2" paddle switch grinders (see first image).  The problem is,  I can not run my new dewalt trigger grip grinder (see second image) or my dewalt 7" (see third image).  Any ideas as to why?  I am putting the pin in on my R57 idler.Thanks in advance!'58 SA 200 Code# 3555
Reply:The SA200 may be producing DC rather than  AC voltage,, or some weird frequency.Many older tools were labeled as AC,,, or AC/DC,, the one that works is 99% probable labeled as AC/DC,,,
Reply:Yes, the SA200s were DC only. I only used tools that were labeled AC/DC on the nameplates. Some newer stuff is AC only, especially variable speed tools or grinders with the soft start features. I hope the OP didn't cause any damage to his grinders.  I once had a guy plug my air conditioning vacuum pump into an SA and let the magic smoke out of the motor. After that the SA's got placards stuck next to the outlet reading "DC power only. If you don't know what that means, don't plug ANYTHING into this outlet". Now it's all Miller trailblazers for me.
Reply:a couple/few yrs ago, i looked at the list of all the dewalt grinders, and they only had 1 or two, that were dc out of all there many grinders they offer.      one being the 28402 in the top pic.     i use the 28402's, and the 28114.     i dont remeber if there was a big/15 amp grinder or not in dc, cuz all new big ones are junk (to me anyway).   also, the sa 200 dont really put enough amps out to run the big grinder right anyway.        other option is if room on truck, just run a costco generator for ur grinders/tools - cheap, light gas,  and sometimes its amazing how much you can prep w/ it, before having  having to start up the 4 cyl machine.      i alsao have a 58 sa 200, code 3554, and its one of my favorites, however it not running right now
Reply:I noticed Rigid “pony “ pipe threaders say“A-C only” on them. I figured it might be becausepeople tried to run them on Lincoln welders with 110v.d.c. and burned them up.Miller a/c-d/c Thunderbolt XLMillermatic 180 Purox O/ASmith Littletorch O/AHobart Champion Elite
Reply:Are the ones that don't run brushless motors ?
Reply:The old drills and grinders had brush type universal motors and would run on ac or dc. A lot  of the newertools are different.Miller a/c-d/c Thunderbolt XLMillermatic 180 Purox O/ASmith Littletorch O/AHobart Champion Elite
Reply:The older SA200's only had 9 amps DC if I recall so likely wouldn't run a 7" grinder very well or at all. The newer SA's were 15 amp DC I believe. Not sure of the amps on the 4 1/2" but would think under 9 amps.
Reply:To funny, my sa200 is code 3555!
Reply:Yes, all SA200s are DC.
Reply:To funny, my SA200 is code 3555.
Reply:Mine aren't burned up. I can use them plugged in to any other power source, just not my SA200.
Reply:Originally Posted by Scotth066To funny, my SA200 is code 3555.
Reply:Originally Posted by 123weldyea, well, they made a bunch of 3554's, then a bunch of 3555's and so on .       so its not quite as good as if  we both got old matching single action  colt revolvers w/ consecutive serial #'s.     if so, we'd get together and make some $
Reply:What would be really cool was if you converted a pistol into a functioning Mig gun. I'd bet they'd sell like hotcakes. Imagine coming across the border and you tell them you bought a new (Mig) gun.
Reply:Originally Posted by SweetMKDoes that mean I should break up my consecutive sets??  Especially, the Model 617 Mountain Guns,, ??
Reply:You need to put a ac generator on belt drive .It is pain in the butt the DC out put.Dave  Originally Posted by Scotth066I have a 1958 SA200, runs and welds great!  I can run all my dewalt 4 1/2" paddle switch grinders (see first image).  The problem is,  I can not run my new dewalt trigger grip grinder (see second image) or my dewalt 7" (see third image).  Any ideas as to why?  I am putting the pin in on my R57 idler.Thanks in advance!