Originally Posted by
Maximo
IDK carbide does not cut chrome plating overly well.....most timing changes require not much more then just removing the chrome plating, IMO using a carbide would be next to impossible to get a clean cut when removing as little material as needs to be removed.........A fine diamond bit works well but I Most definitely would never ever recommend using a Dremel for cutting ports..........Dremels are also not a very good choice for cutting ports. because their motors are so amll Dremels need to use excessive RPM to make any power. too much RPM causes vibration and bit runout which makes cutting cleanly very tricky......... I use a Jewelers grade flexible shaft tool which works extremely well....however I still dont think using a carbide works well at all, even in a flexible shaft...
I agree that most timing changes require not much more then just removing the chrome plating but on the ones that do require going through the plating you can rough it out with carbide and finish with a diamond. Dremels do work fine. I have both dremel and jeweler grade flex shaft and there is very little difference in the cut. If you are going to go into business modding motors than by all mean get the flex shaft. If your going to mod a couple motors a Dremel will work just fine.