Router Bits: Single Flute vs Double Flute

[joe2]

What is the performance and or application difference between router straight bits with a single flute and a double flute? Why two diff bits that do the same thing?

[dadiOH]

1. single flute cuts rougher but heat up less.

1. single flute bits are usually plunge bits

[Toller]

I asked the same question after buying some single flute at an auction. I was told they were for corian, which makes sense since I bought some corian at the same auction.

[Leon]

Oddly the single flute bit offers better performance than the 2 flute bit.

Per the Amana tool site, Single flute allows for faster feed rates, greater chip clearance and maximum stock removal.

[pat]

A single flute cutter can be stiffer if the grinding design permits. Resistance to deflection is a good property. Most 2 flute cutters exist because of dynamics. A single flute OGee, e.g. will blow itself up at

25,000RPM. Single flute bits have balance problems and are rarely found on cutters with diameters much > than the shank. (Routers)

[nailshooter41]

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[dadiOH]

Nope.

[Morris Dovey]

| What is the performance and or application difference between router | straight bits with a single flute and a double flute? Why two diff | bits that do the same thing?

A single flute on a straight bit allows retention of more "meat" on the shank - resulting in a stronger bit with less deflection.

A single-flute bit requires a slower feed and/or higher spindle speed.

More flutes permit higher feed rates and/or lower spindle speed. When I have a choice I opt for three flutes, with two flutes as my second choice. I've found that more flutes produces a smoother cut, perhaps because with the spiral cutters I use, one of the flutes is always bearing against the side of the cut.

When cutting with a V-bit, three flutes allows "parking" the bit briefly without enlarging the cut at the parking spot.

The bits may be intended to produce the same-shaped cut but their behavior is different. Choose the bit that provides the behavior characteristic(s) you deem most important for the job you're doing.

-- Morris Dovey DeSoto Solar DeSoto, Iowa USA

[joe2]

Thanks to everyone for your input. Surprising how many folks selling router bits weren?t able to answer that question.