Just doing some showroom test cuts on MDF today. I believe its good to add 2nd quality MDF as normally thats what i find here in Spain. Very good MDf and a Crap one. The good one is very dense, very smooth. And cuts excellently. The other one is more like paper like though it seems nice at first touch.
On a very sturdy machine with brand new super sharp Kyocera fish tale 3mm 2 flute micro grain carbide bit that i use from years and is probably the best 1/8 3mm bit around, feed rate had to be lowered to 70% from original. I am saying that cause normally even the start cut on an absolutely new material for me using HSMAdviser is superb. So same like the normal MDf -30% slower.
On photo below could be seen how clean is the cut with the adjustment, opposing the initial one.
Another note also is for V engraving wood. Especially soft wood. Whatever the calculators say, raise the feed more than 60IPM or 1500mm and wood will start to ship even if the cut is perfect. So as i cut a lot of that, that my rule of a thumb. Its simply a quality of wood which has grain. Not talking about the woods without grain. So maybe there also some small change, say wood without grain all stay same,. Wood with grain- different material with max 1500mm/min for engraving. I am talking about 60 and 90 degree bits. 45 and 30 had be be even slower on wood grain. I cut thousands of pieces per year with quality tools, so i believe i have some reason. Same thing happens also with big CMT indexing cutters. they cut perectly but on every hundred pieces 5-9 will hack up if feed is not lowered. So i prefer 100% result, hence the notes. I believe if a person cuts a couple of pieces and sees a perfect cut he assumes all is right. Not so when you cut 500 pieces of same material.
In short, HSMAdviser will be even more perfect if a separation between woods with grain and no grain is made and speeds for Grain are lowered accordingly