The friction of the wheel against the metal would provide enough heat for the wax to melt.
Let the part get to hot and it will burn, leaving visible burn marks on the metal. I have got these by working too slow.
Experimenting countless different methods on the same stainless steel piece this is what I have observed (taking into account advice i have received on this forum).
Using less compound works. If the part was too cold (from moving the part too slowly, for instance), there would be black globs of compound left on the part. While if it was too hot, buffing was uncomfortable and occasionally left burn marks. Too much compound for me left haze and black globs if cold. The get the piece warm, and for the compound to be evenly distributed and worked into the wheel, simply place the piece against the wheel with medium pressure and hold the compound bar against the wheel ahead of the piece (ie bar above te piece if the wheel is turning clockwise looking from the LH side). The pressure of the piece warms up the buffing wheel surface uniformly letting the compound melt easier. Plus you don't get left with **** all over the ground.
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