Riving Knife/Splitter and Blades

**SuperB15** · 17th September 2017, 11:24 AM

Got a new Laguna Fusion saw in shed - but yet to use (almost finished setup). It is 1st decent saw and I am low in experience with saws.

Saw came with a 40t blade which I assume is classed as a combo. I have measured it and body is 2.mm and has a kerf of 2.87mm.

The riving knife which is stated as 2.3mm thick (it is very close to that maybe slightly thicker in places- are they tappered) has directions on it that says to use a blade with:

Min kerf of 3mm
Max body width of 2mm

I would like to get a dedicated rip blade and a separate fine crosscut. I had it in mind to get blades with same kerf so that measurements from blade were totally consistent. Is this the best approach?

I also want to have 16mm arbor and not use spacers as am not impressed with the Bosch blade and it's spacer that I have.

Looking on line I have yet to find a blade that seems to meet requirements noted on machine. From looking on line it seems that a lot of standard type blades are 3.2mm kerf (which meets needs) and body thickness of 2.2mm which does not meet machine direction. I realise that the blade body measurement of 2.2mm is still minutely thinner than riving knife but I am not sure if this is enough clearance.

I could go for thin kerf blades but would these be prone to more flex?

**rustynail** · 17th September 2017, 01:11 PM

It becomes a little confusing when you have to figure in both body thickness and kerf width. Think of it like this; the body of the blade requires clearance, not the teeth, they are engaged in the timber anyway. Provided the timber cannot clamp onto the body of the blade all is good. A splitter thickness between kerf and body thickness is ideal.

**SuperB15** · 17th September 2017, 03:33 PM

Originally Posted by rustynail

A splitter thickness between kerf and body thickness is ideal.

Yes that's what I figured. Finding a matching kerf for both a rip and crosscut to match riving knife is what I am finding difficult.

**elanjacobs** · 17th September 2017, 04:53 PM

2.2/3.2 is pretty much industry standard. Have you looked in to replacing the riving knife instead?

**Mehrdad** · 17th September 2017, 06:40 PM

Hi,
I have using my Fusion table saw with some of Freud blades for 2 years no problems at all, cut 65mm jarrah with glue line rip blade cut it with ease just feed it with right speed, as you know the saw is 2hp

**rustynail** · 17th September 2017, 07:13 PM

A slight set variation can be used to solve the kerf issue. Easier to do this than change splitter.

**SuperB15** · 17th September 2017, 11:41 PM

Originally Posted by elanjacobs

2.2/3.2 is pretty much industry standard. Have you looked in to replacing the riving knife instead?

Yes I have consider that. I could maybe make one out of 2.5mm sheet and get 2.2/3.2 standard blades. Just need to be easier on feed?

Originally Posted by Mehrdad;

I have using my Fusion table saw with some of Freud blades for 2 years no problems at all, cut 65mm jarrah with glue line rip blade cut it with ease just feed it with right speed, as you know the saw is 2hp

Being a Freud Glue Line Rip is that a thin kerf?

Originally Posted by rustynail;

A slight set variation can be used to solve the kerf issue. Easier to do this than change splitter.

RN that is something I have not heard of. Could I trouble you to expand on it?

Cheers

**rustynail** · 18th September 2017, 08:43 AM

When a blade is sent for sharpening, set should also be checked along with tension or warp. Usually the set of the teeth doesn't require altering and the saw doctor only needs to resharpen and check for flatness.
To overcome the kerf width issue the set on the teeth can be increased or decreased slightly to accommodate your existing splitter. This can be done at time of sharpening or just a reset.

**elanjacobs** · 18th September 2017, 09:09 AM

Carbide tipped blades don't have set

**Mehrdad** · 18th September 2017, 11:41 AM

Glue line rip 5/8" Arbor, Kerf 3.2

**ian** · 18th September 2017, 11:54 AM

Originally Posted by elanjacobs

Carbide tipped blades don't have set

granted.

but if I may draw upon your training, what is the proper term for the "overhang" between the width of the teeth and the thickness of the blade disc?

also on some ATB blades are the left and right teeth off set to their respective sides? Does this off set have a proper term?

also I have a Freud glue line blade where the square teeth are "shorter" than the trapezoidal teeth -- i.e. the blade doesn't leave a flat bottomed kerf. Does the difference in tooth height have a proper name?

**rustynail** · 18th September 2017, 12:33 PM

Originally Posted by ian

granted.

but if I may draw upon your training, what is the proper term for the "overhang" between the width of the teeth and the thickness of the blade disc?

also on some ATB blades are the left and right teeth off set to their respective sides? Does this off set have a proper term?

also I have a Freud glue line blade where the square teeth are "shorter" than the trapezoidal teeth -- i.e. the blade doesn't leave a flat bottomed kerf. Does the difference in tooth height have a proper name?

That is the set to which I refer. Not adjusted by tooth bending, but instead by grinding.

**rustynail** · 18th September 2017, 12:35 PM

Originally Posted by elanjacobs

Carbide tipped blades don't have set

The offset of the teeth is still refered to as set.

**SuperB15** · 18th September 2017, 01:36 PM

Originally Posted by Mehrdad

Glue line rip 5/8" Arbor, Kerf 3.2

Do you know the blade/body thickness?

**SuperB15** · 18th September 2017, 01:41 PM

Originally Posted by ian

granted.

but if I may draw upon your training, what is the proper term for the "overhang" between the width of the teeth and the thickness of the blade disc?

also on some ATB blades are the left and right teeth off set to their respective sides? Does this off set have a proper term?

also I have a Freud glue line blade where the square teeth are "shorter" than the trapezoidal teeth -- i.e. the blade doesn't leave a flat bottomed kerf. Does the difference in tooth height have a proper name?

Overhang info see this video:
https://www.youtube.com/watch?v=18fkoDZ_hyU

does this help

the square teeth are "shorter" than the trapezoidal teeth - is it tripple chip see this video:

https://www.youtube.com/watch?v=cne3EwRo5cY

I know I learnt from them!!

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