The RAMP AMOUNT is the distance during the lead-in that the cutter spends in the ramp to the Total Depth of the Cut.
For example, if you have a lead-in distance of 1.0" in 1.0" material, but want the cutter at full depth before it reaches the part, you may specify a RAMP AMT of 0.5." The cutter will ramp down to -1.0" in the first 0.5" of travel and will spend the next 0.5" of its lead-in at the maximum Cut DEPTH.
Used with Ramp Inside and Ramp Outside cycles only.