I have seen this, chances are you have a reamer in a tool path, if it's a 1/4 reamer you'll find it has a 1/4 in chamfer on it. That's what I've been seeing. Dave

Just a heads up, I upgraded Win 7 to Win 10. MasterCam came to a crawl. Check your program properties and turn off Win 7 compatability mode. MasterCam is zipping right along now. Just a PSA,,,, that is all..... Dave

I've used it, works well. I try and use it when possible. This path used to take 5 min per part in the lathe to bore them out, I can make 2 in a touch over 2 min, then off to the lathe to finish the OD and outside radius's. Total per part is about 2 1/2 min. I was pleased with the whole operation. Dave Machine 1991 Milltronics Partner 1 Centurion 5 control, No coolant, only air blast, Material 303 stailness, Tool path is MasterCams High Speed 2d tool path MasterCam Ver X5, Cutter 1/4 dia 4 flute TiAln coated, RPM 4850, Feed Rate 250 ipm, Radial engagement 7 percent of dia, Depth of cut .1875

6 min 42 sec Mastercam X3 IBM Intel P4 3GHZ (dual hyperthreading thingy) (Tigerdirect off lease computer at 299.00 or something like that) 1.5 gb ram ATI Catalyst 256 meg video XP Pro SP3 I forgot to mention in my earlier post, the Acer Laptop runs at 1.6 GHZ Dave P.S. newchsmcam, yes, it is here ftp://www.mastercam-cadcam.com/Mastercam_forum/MCX2_Files/

7 min 35 sec Mastercam X4 Acer Aspire 5100 Laptop AMD Turion 64 x2 2.62 gig ram 128 meg ATI Catalyst onboard video Win Xp Media Edition SP3 Not the greatest but it is almost 3 yrs old Dave