Vintage Router? What Do I Do? - Page 2 - Router Forums
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post #11 of 14 (permalink) Old 03-02-2019, 12:38 PM
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Speed could probably be increased by changing pulleys.

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post #12 of 14 (permalink) Old 03-02-2019, 12:46 PM
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[QUOTE=ger21;2002145]Number of flutes is not the issue. A 3 flute tool cuts at the same speed as a 2 flute tool. It just takes a shallower cut, all else being equal.

Now think of what’s happening when you cut wood. A two-wing router bit at 21,000 rpm provides 42,000 cuts per minute, which is part of the reason for the great cut quality you typically see from router bits. A two-wing cutter in a shaper at 10,000 rpm would only provide 20,000 cuts per minute, so cut quality can suffer. The solution? Most shaper cutters are four-wing instead of two-wing which, as a rule, also makes shaper cutters more expensive than router bits.

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post #13 of 14 (permalink) Old 03-02-2019, 01:35 PM
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Sorry, but I disagree.
A shaper gives a far better cut quality than a router, and it's due to the larger diameter, not the number of cuts/minute.
Cuts per minute is meaningless without knowing how fast the wood is being fed into the cutter. Cuts per inch would provide more info. Due to it's larger diameter, a shaper is typically slicing through the wood at the same speeds a router is.
A 1/2" router bits cutting edge is moving about 29mph at 20,000rpm.
A 3" shaper cutter is moving at 70+mph at only 8,000 rpm. SO it's cutting nearly 3x faster at less than half the rpm.


Shaper cutters are more expensive than router bits because they are often 3-5 inches in diameter, rather than 1/2" to 2", and can have 3-5x more carbide in them.
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post #14 of 14 (permalink) Old 03-02-2019, 05:23 PM
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Welcome to the router forums,

That looks a lot like my Delta made back in the 50's. Shapers were made to run large amounts of molding and trim for furniture and building industries. If you really want to use it make sure you leave any guards in place and if lacks guards you might consider adding some. Don't wear long-sleeved clothing that is loose, it could pull your hand and arm into the blades if it grabs a loose sleeve.
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