[TheForge] Chop Saw Irritation

[RW]

Has anyone noticed that while cutting through a piece of mild steel,
especially hot-finished, that the sparks are abundant and the wheel seems to
be moving right through the piece, then suddenly, the sparks diminish to a
small stream and it seems that one has encountered a "hard spot".  Sometimes
extra pressure seems to get the wheel through this spot but sometimes
nothing helps and the wheel just stays there not moving.  The Instructions
say, let the wheel do the work.  Do not bear down on the metal.  But
frequently that does not work.  What is going on here?  What can be done to
resume a nice straight and easy cut?
RW