Why does my 10" CM table saw only use 6" dado blades?

[ajchien]

I have a newer craftsman 10" table saw (2 years old). There is a sticker on the front that says only use 6" stacked dados. Not to use adjustable dados.

So, what's wrong with using a 8" dado blade? And why only stacked and no adjustables?

 

[neophyte]

A dado blade set removes a much larger amount of material than a single saw blade since it's essentially 6 to 8 saw blades stacked together. The motor might not be powerful enough to remove the full amount of material the dado set would be capable of in a single pass, and there are probably people who would try to do so and then ask Sears for warranty repair. The drive system may also not be strong enough to handle the start up torque necessary to get a full dado set moving which could lead to damage or premature wear.

 

[sasquatch12]

Not really sure, but think it has something to do with RPM, and Surface feet per minute.

 

[McFarmer]

I imagine an adjustable would vibrate more.

 

[woody 73]

Take a few minutes and read the following posts for some more insight into your question:

http://www.sawmillcreek.org/showthread.php?21494-Dado-blades

 

[Craptain]

Don't worry about it anyway. A dado is only for cutting a slot not cutting deep. 6" works for my needs.

 

[larry_g]

One reason is the force that a motor of given torque can apply. To make math simple lets say that your motor makes 12 lb/ft of torque. If you have a 3" radius blade then it can develope 48 lbs of force at the tooth. If you have a 6" radius blade on the saw then you are applying 24 lbs of force to the tooth. The force required to dig out a chip of wood goes up as the width of the chip increases. Horsepower comes into play when you start considering volume/minute removed.

lg
no neat sig line

 

[jakemac]

It's not just the motor that needs to be taken into consideration. The strength of the arbor and the materials that the mounts are made of are also factors. A cheap casting for the arbor mounts may not be able to handle the vibration of an adjustable dado set, or the torque required to spin up a larger diameter stacked set.