I am new to the world of cnc but have been woodworking for years. I have been making models out of mdf for a few years now and have been routing these using a handheld or table top router. I have been using standard grade 18mm mdf from local B&Q stores etc with no issues. Using the same mdf on the cnc the finish cut is very poor. The core (centre part of the board) goes extremely fluffy and you can see a slight step where the cutter has moved to the next cut down. I have been reading that there are different grades of mdf and maybe the stuff I have been buying is not dense enough. The other observation I have made is following the feed speed calculator the router moves very quickly over the piece. I am wondering if anyone else has experienced this problem and can offer a solution

Thanks Steven