Undercut Metal Door Jambs

Question

I am installing floating floors in a 1970s condo where the door frames are metal.  Side jambs are right against the concrete subfloor with no gaps.
I tried an oscillating tool with Bosch carbide-tipped blades and after a full minute, it looked like a fingernail scratch.  My current tool is a cheap B&D - would it be worth borrowing a friend's tool to see if it makes a difference?
Another option was grabbing the right blade and getting down with an angle grinder.  I have no experience using them and it honestly looks pretty frightening.  However if there are no alternatives then I will just have to do my research and be careful.
The last option was renting an electric jamb saw tool and buying metal-specific blades.  This path would be over $100 and some effort to find one as they are all rented out nearby.
Hoping anyone has better ideas for how I can undercut the metal!  Maybe there's some secret multitool technique that I'm missing?  Thanks all

Fresh Codemonger · Answer

Use an angle grinder.  I recommend practicing though I find angle grinders one of the easiest tools to control (no crazy binding like drills).  Really you should buy one they are $15 USD at harbor freight.  If you are going to use it more than once splurge and get the $30 one.  Any metal cutting disc will cut that quick.  Just get a thin kerf (3/32") blade, wear eye and ear protection and keep any plastic out of the way of the hot metal particles.  Won't hurt to have an extinguisher near by.
I've used oscillating tools on metal - the blades dull really quick.  A reciprocating saw can work but you have limited clearance.  Even then the reciprocating blades can dull quick quickly on metal as well.  I can't imagine using a jamb saw on that.

Undercut Metal Door Jambs

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