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Subject:	Re: Chipload Calculations for Sawblades
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Message Thread:

Chipload Calculations for Sawblades

10/4/21

Timothy Becker

Member

Hello,

I am most familiar with calculating chip loads on CNC endmill tooling, and have some success with doing the same with sawblades using the standard feet per second federate divided by RPM times the number of teeth, my question is why isn't the radius of the sawblade considered in this Chip load equation? Here's my thinking, I have a 3600 RPM machine with a 70 mm arbor, meaning, that arbor is traveling 219.8 mm per rotation, roughly 13,188 mm per second. At the edge of the blade, lets say a 350 mm blade, travels 1099 mm per rotation, or 65,940 mm per second. With a difference between blade diameter's velocity of nearly 5 m per second, that has to effect chip load, right? Especially when the critical component of the equation is feed speed?

10/4/21 #2: Chipload Calculations for Sawblades ...

Mark B

The radius is completely considered when you put in your tool diameter and number of flutes, etc.. If your running a 14" diameter saw blade with 60 teeth (60 flutes) with pretty much zero helix angle, your in the realm of reasonable calculation. Look into FS wizard app... its handy.

10/4/21 #3: Chipload Calculations for Sawblades ...

Mark B

In your example the arbor diameter or RPM is meaningless. RPM is RPM period regardless of diameter. What matters is the diameter at the cutting edge. So in a chip load calculator you would put in your tool diameter (350mm), your RPM, helix angle, depth of engagement, feed rate, yada yada. In a table saw application (other than feeder fed operations) your feed rate would likely be the Achilles heel. If your feeder fed, you have that. At that point its all pretty much relative.

10/4/21 #4: Chipload Calculations for Sawblades ...

Timothy Becker

Member

Absolutely on both points you made, when calculating chip load on an endmill the radius in considered (I use GWizard personally) but in the sawblade chip load calculator (Feed speed(fpm) x 12)/(RPM x #of teeth) it isn't considered, and that is my question, why not? Second, RPM is always RPM yes, but distance traveled / time is the point I was trying to get across( the arbor measurement is arbitrary, just a comparison, as valid as an 8" blade vs a 12" blade) , and distance traveled puts more or less teeth in the workpiece as long as my feed rate is the same ( yes, it is auto-fed, yes I control the feed rate) meaning, more or less of a chip load per tooth. But good point, I should be able to use the calculations for a endmill chip load compared to the sawblade chip load to determine the effect the radius on the chip load.

10/4/21 #5: Chipload Calculations for Sawblades ...

Mark B

Im not sure what the issue with the arbor is because Ive never considered it.

Lie to the calculator and make the arbor the same diameter as the tool diameter?

10/7/21 #6: Chipload Calculations for Sawblades ...

Bill

Member

Mark B

Where can I find the FS Wizard?

Thanks
Bill

10/7/21 #7: Chipload Calculations for Sawblades ...

Mark B

Bill,
Its an Android App but a web version is available here
https://app.fswizard.com/

Im not sure if there is an apple version but Id imagine so.

https://app.fswizard.com/

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