Circular Saw Blade SFPM Calculator - Router Forums
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post #1 of 3 (permalink) Old 12-17-2013, 08:08 AM Thread Starter
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Default Circular Saw Blade Calculators

Once up a time, I was told that cutting on a circular saw (specifically a table saw) should be done withe the speed at between 10, 000 to 18, 000 surface feet per minute (sfpm). I thought these were important numbers for blade life and quality of cut... until I figured out that some smaller saws are slower that that new. (Ask me if you want those and I'll post.)

Here is an online calculator to find and work with various data for circular saw blades:
Circular Saw Feeds & Speeds Calculator

Then I found a few more:
Circular Saw Calculator, Quad Sawbox, Twin, Feed Speed, Horsepower, Tooth Bite, Gullet Fill, Sawmill - Online Expos
Circular Saw Horsepower Calculator!

Note-- please realize that the blade motor RPM, is not the arbor RPM... unless the pulleys between them are the saem size, 1:1. Usually, they are different in size.

Actually, I found these while looking for something to figure out the feed rate of... which should use the rpm, diameter, teeth per, gullet area... which then would affect depth of cut... and feed rate. Still looking for those formulas, which should be available for CNC TS'es...Rip, Edger and Gang saws. What I've found so far on that is something like this:

Feed speed
The feed speed V, [m/min] is the speed of the forward feed movement of the workpiece or of the tool. The feed speed is proportional to the feed per tooth fz and is essentially responsible for the quantitative output. It is calculated by the formula: Vf = fz n z/1000 [m/min]
Vf = Feed speed [m/min]
fz = Feed per tooth [mm]
n = Revolutions per minute [min 1]
z = Number of cutting edges/teeth

When machining solid wood feed speeds range from 1 – 220 m/min (3.3 - 723 ft/min) with a highest frequency of occurrence in the range 5 – 25 m/min. (16 - 82 ft/min.) High feed speeds require large technical expenditure on tool construction, machine design, workpiece guidance, power demand etc... But there's another one out there that takes into consideration how much waste the gullet has to carry away and the chip load of the teeth on various density materials...

"Don't worry, I saw this work in a cartoon once."
"Usually learning skills and tooling involves a progression of logical steps."

Last edited by MAFoElffen; 12-18-2013 at 10:50 AM.
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post #2 of 3 (permalink) Old 12-18-2013, 08:23 AM
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I guess that ever since my age 8, our Dad drilled into our heads (David & me) that 60 mph = 88 feet per second. Much can be done with that. Turning threaded rods with knowledge of their respective TPI and thus measuring nut progression over exactly a minute or fraction thereof can often waken one [user] to the FACT that their tools frequently are not really turning the RPMs stated by the equipment.

Example: When people buy a new car or truck and change-up to a larger wheel/tire size combination - they are no longer going the speed indicated on their speedometer.

Otis Guillebeau from Auburn, Georgia


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post #3 of 3 (permalink) Old 12-18-2013, 02:24 PM
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Mike, Logging and Sawmilling Journal had a sawmill calculation in a center pullout a few years ago that may have the missing calculations regarding gullet size/feed rate you are looking for.

Back in the late 80s someone from the the Riverside Forest Products mill in Lumby, BC told me that they were sawing at about 5.5' per second. They said that he sawyer would get pissed off with the guy running the log bucking station if he was leaving gaps between the logs going into the head saw (probably more like a canter head).

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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