blade thickness

[bobpuga]

i,d like to know if you could shim the blade out from the arbor with brass shim stock(veritas) so that i dont need to have a diferent rail for the ripping blade .i figured you guy's could perfect this idea :

 

[The Dude]

What difference is your mic. showing between the two kerfs?  My eyes are getting a bit tired with age, and my hands are not as steady as they once were, but I am reading the same kerf between the Universal blade and the Panther blade?  At least, well within my tolerance for not having to change my rail/splinter-guard for a cut; especially in a rip environment.

Just my opinion, but I wouldn't mess with it, shimming that is!  Once again, JMO

Timmy C

 

[semenza]

Hi,

  According to the package labeling- the universal and panther blades have the same kerf. But the fine blade is thinner by  .3 mm  so that would be .15 mm per side.  Shim huh, maybe? ???

Seth

 

[The Dude]

Riddle me this then....check my logic here without trying to overthink this shim question....'cause I still wouldn't do it!

Once the blade is on the arbor...does it not seem to rationalize that the "inside" edge is independent of kerf; unless you were concerned about the "off-cut" side?

In other words, the distance from the splinterguard is irrelevant with relative to the kerf?

Hmmm,

I still wouldn't shim...deep question.

T

 

[Tinker]

Unless the teeth are set to allow for that .15mm per side, the teeth will be in .15mm closer than with the crosscut blade.  What would one shim with to make that up? 

Hell, I can't SEE anything that thin.  I can hardly see the difference between 1mm and .5mm.
Tinker

 

[The Dude]

Good Point on the tooth set Tinker.  Festool is precise, however, I am not that precise....what would that equate to in inches?

Timmy C

 

[Ned]

What difference is your mic. showing between the two kerfs?

I think Bob's trying to adjust the clearance between the rail's rubber strip and the blade.  Since the blade teeth (and the kerf) are wider than the blade body, a wider blade will cut into a rubber strip already prepared for a narrower blade. Then, when you remount the narrow blade, the rail's rubber strip is not exactly the left edge of the cut--it's off by, say, 0.15mm.  Shimming when using a wider blade would avoid this.

I understand the concern, but my question is how much it matters.  0.15mm is 0.0059 inches. 

Ned

 

[The Dude]

AHHH, gotcha!  And thank you Ned for the math. 

Timmy C
I thought this was no labor day???

 

[bobpuga]

please see post by dreamer on 7/31 "using saw guide on diff blades" this is where i should have posted this as it is really a reply to this thread which i have been thinking about for awhile

 

[semenza]

Hi,

    Some how whenever I do a blade swap it seems to make a bigger difference than the measurement of .15mm would  indicate.

Seth

 

[greg mann]

The critical dimension is not kerf but the amount of offset between the mounting, or inside, face of the blade and the inside cutting edges. We can assume the teeth are centered on the blade but that doesn't really tell us anything. Are the bodies the same thickness? Theoretically, the kerf on one blade could be twice as thick as another blade and still cut to the splinterguard exactly the same as long as the mounting surface to splinterguard side cutting edges distances are the same. All the difference would show up on the side away from the splinterguard. First chance I get I will set a couple blades up on a plate and check this offset with an indicator.

 

[semenza]

The critical dimension is not kerf but the amount of offset between the mounting, or inside, face of the blade and the inside cutting edges. We can assume the teeth are centered on the blade but that doesn't really tell us anything. Are the bodies the same thickness? Theoretically, the kerf on one blade could be twice as thick as another blade and still cut to the splinterguard exactly the same as long as the mounting surface to splinterguard side cutting edges distances are the same. All the difference would show up on the side away from the splinterguard. First chance I get I will set a couple blades up on a plate and check this offset with an indicator.

      I measured the blade bodies on the universal and fine at the edge between the teeth. They are both .65 inches. Unless the blades are diferrent in the center near the arbor hole? 

Seth

Seth

 

[greg mann]

Seth,

I am not sure but I think you must mean .065 and .075, although that seems thin to me. At least it does without having the blades in front of me.

 

[semenza]

Seth,

I am not sure but I think you must mean .065 and .075, although that seems thin to me. At least it does without having the blades in front of me.

      Yes, thats what I meant. Be one heck of a kerf otherwise, eh?   Sounds thin until you realise that the kerfs on them are all less than 1/8" (.125)

Seth