I have a nice new 1/4" shaft, 90 degree die grinder, and
would be willing to also buy a straight one if needed (though I don't see why it
would be). I've been told the weapon of choice for porting is a carbide bur, but a quick look
at McMaster-Carr makes my brain hurt.
First, I see Double, and Single cut burs. These are
defined as:
| Double Cut— Cross-fluted pattern removes metal
faster, produces smaller chips, allows better control, and gives coarser
finish than single cut. |
|
Single Cut— For use where more gradual stock
removal and finer finishes are required.
|
Sounds like you'd probably start with the double cut, and
finish with the single. I'm sure you need to smooth it further than what
the single will do, so what do you use for that? Flapper wheels?
Polishing compound?
Next, there's a baffling array of shapes and sizes of
these things. They can be purchases individually, or in sets. My
normal temptation is to go for a set, but I usually find that I use 2 or 3 of the items in a set, and never touch
the others. If that's the case, I'd be better off to just buy a
couple each of the most used shapes.
They also have extra long burs, which also seem like they'd be
useful.
You can see these at http://www.mcmaster.com/ . Put
2470 in the search box, which will take you to that page. At the top, you
can advance to the next two pages as well, which also contain 1/4 shank carbide
burs. Any suggestions would be most appreciated.
With my level of porting
skill, I'm convinced I can outperform Tracy. Unfortunately, I
don't believe Tracy will let me port his engine :-)
Rusty (beware sharp
spinning objects)