negative spindle speeds caused mis-estimation of feeds (always assumed positive in code)
negative spindle speeds caused mis-estimation of feeds (always assumed positive in code)

jihyun-kim/heekscnc,satovey/heekscnc,asmuelle/heekscnc,asmuelle/heekscnc,jihyun-kim/heekscnc,satovey/heekscnc,jihyun-kim/heekscnc,asmuelle/heekscnc,satovey/heekscnc,asmuelle/heekscnc,jihyun-kim/heekscnc,satovey/heekscnc