DMiller
Senior Member
Spindles usually soft steel, cut easy, about as easy as busted axle will swell one!
I believe the reason the file works better is it the area is nice a smooth the file teeth ride on a large surface area so the load is carried by several teeth. But when you get to a high spot all the load is confined to maybe two or three teeth of the file so the load per square inch goes way up there by cutting deeper and faster.I seemed to be able to keep a nicer radius using the file method.