On May 26, 10:31*pm, "Michael Koblic" wrote:
I have to cut 2 perfectly matching slots in a 5 mm thick flat semicircular
piece of steel, each 15 mm by 5mm.
As per suggestion on another thread I doubled up on the hacksaw blades. This
gave me only just over 2 mm. Cutting this length with a file is not a
prospect I relish. I tried with a 3/32 cut-off wheel in a 4-1/2" grinder.
This works but holding the grinder in exactly right plane is tricky.

I wondered: what if I put a 6" cut off wheel into my bench grinder. I would
have access and control. Even if the wheel produced a thinner slot, one
could control two passes this way more easily than with a hand-held grinder.