head porting
I have a mikita die grinder that is like a giant dremel tool. Works fantastic. Ain't cheap though I think they are around $200 now. Might be able to get an off shore knock off cheaper.
Mine has around 15 years of use and is still making chips.
The only " problem " I have had is the stamped collar that fits on the end of the plastic body on the business end of it will vibrate loose and drop down occasionally.
It's a simple matter of pulling it back up and giving it a quarter turn or so to re-engage it to the body.
But for all the work it has done , I can't complain.
Carbides last forever ( nearly ) compared to high speed steel cutters , but especially when new , they are serious about their stock removal , and if they bite in , it can get ugly.
Light pressure on the tool and let the cutter work.
A couple different shapes and diameters will do it , an oval and tree shape are my go to. The long shaft cutters are a little too long , so I typically cut them down a bit.
Cartridge rolls in varying grits are essential.
I'm not a fan of flapper wheels , but will use a piece of sandpaper on a mandrel sometimes.
You don't want a mirror finish......it is pretty , but counterproductive.
Don't go crazy and you can get some free ( sort of ) horsepower here.
