I had the whole head ported and smoothed as well as the front water passage in about 30 minutes.īy all means if you plan on grinding any aluminum get some aluminum cut carbide burs. Caution: As bit shank is exposed beyond 1/2', maximum safe rpm decreases significantly. Head diameter is measured at the widest point. Bits are also known as mounted points and die grinder bits. The aluminum slivers just fly off and NO loading up on the bur. Almost as hard as diamond, these tungsten carbide bits cut through nonmetals without generating heat. You just BARELY touch the aluminum and it is like cutting butter with a warm knife. Wednesday night I tried them out on one of my AFR alum heads. Die Grinder, Heavy Duty, Straight, Full Size, 1/4 in., 20,000 RPM, 4 cfm, Each. I later went inside and did a search for aluminum cut carbide bur. After I finished the grinding with the burs I used sanding rolls and finished it up all nice and smooth. Then I would spend 5 minutes cleaning out the aluminum from the flutes. Using regular double-cut carbide burs they would load up after a few minutes of use. Last weekend it took over 2 hours to port match the tunnelram/blower intake to the gaskets. Patriot Performance 888/462-8276 Patriot-Performance.Man do I have the HOT TIP for grinding/trimming aluminum. ID suggest you select from heads from these sources Yes quality varies and your going to be doing research or your not likely to get the best value per dollar or best potential would be foolish to not ask about the options cost and potential benefits of those upgrades. Youll almost always find that the larger and better known brand name suppliers like The manufacturers can buy in volume and purchase valve train components a good deal cheaper than you can, and they can have heads machined in large batch jobs that also reduce machine work costs, but they are also trying to be competitive so they rarely select the top quality components, thus there's always a trade-off and you,ll rarely see top quality machine work, and the better components used in off the shelf heads for sale.that does not indicate the off-the-shelf heads are junk, but the manufacturers must balance quality and price to remain competitive. THE question about buying bare heads and having a local shop you trust add the valve train components and do the machine work, VS buying ready to run, off-the-shelf cylinder heads, comes up frequently. The fingers you save may be your own.ĪLWAYS WEAR EYE PROTECTION WHEN USING A CARBIDE BURR Let the burr come to a complete stop before touching it. Never exceed the manufacturer's recommended speeds and feeds for any cutting tools. Use caution when using any cutting tool, and always wear appropriate eye protection and safety equipment. Go slower if the shank is exposed.Įxtra long carbide burrs should be run 25% slower than a standard burrĬarbide burrs ranging in size from 3/16" (4.75mm) diameter to 3/8" (9.5mm) diameter, a 30,000 RPM die grinder is recommended.Ĭarbide burrs ranging in size from 1/4" (6.3mm) diameter to 1/2" (12.5mm) diameter can usually be run effectively with a 22,000 RPM die grinder.ġ/4” (6mm) x 6” long: 17,000 – 33,000 RPMģ/8" (10mm) diameter: 15,000 - 30,000 RPMġ/2" (12mm) diameter: 11,000 - 22,000 RPMĬarbide burrs, like all cutting tools, are dangerous. Too much pressure or too much speed might cause the shank to vibrate or bend while the burr is spinning, or teeth to break.Ĭarbide burrs up to 1/8" (3mm) diameter may be run at speeds up to 75,000 RPM, depending on the material being cut and amount of shank exposed. The following are general speed recommendations and may need to be adjusted to your specific application.Ĭarbide burrs and carbide rotary files, like high speed steel burrs and rotary files, are safest when used with the shank all the way into the collet and only the head is exposed.Įxtreme care should be exercised when the head of the burr extends farther out. SFPM = (RPM) (3.14) (DIAMETER) divided by 12 Most of the time you'll find a few seconds time to put on safety equipment and the minimal cost spent is far FAR less than it costs in time and money to deal with the medical cost resulting from rushing into a job without their use! Ive generally used and strongly suggest you consider using, one or both of these when using angle grinders or while porting heads due to learning from past experiencesītw it helps a great deal to dip the burr in a shot glass of WD.40 about every 20-30 seconds as it helps keep it from picking up crud sticking to the burrs cutting edgesġ,500 - 3,000 Surface Feet Per Minute (SFPM)
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