CMT 271.250.43M Thin Kerf

Intended purpose: Combination Rip and Crosscut – Thin Kerf
Tooth count: 42
Price: $69
Source: Carbatec

Tooth Grind: ATB (alternating top bevel)
Kerf: 1.70mm
Carbide thickness (measured front face to braze): 1.83mm
Carbide length: 4.45mm
Front face length: 3.80mm

Blade axial runout: 0.005″ (0.13mm)

Expansion slots: 3, curvy hook design with crack limiter

Anti-vibration slots: 3 x double lasercut. One a simple curve, the other a multiple S pattern.

The anti-vibration / anti-noise features of this blade are pretty typical for the CMT blades, and they appear to be effective.

Blade body thickness: 1.50mm

General Description:

This was a really interesting blade to try, not the least of which because I had not experienced a thin kerf blade before.  Even through I knew to expect it, I still got caught out by forgetting that the riving knife would be too wide for the kerf made by this blade, so I got trapped on it and had to abandon the first cut.  Rookie mistake.

I was fascinated by how easily the blade cut – it was a substantial difference to a wider kerf blade.  My saw is not underpowered, so it didn’t notice a difference, but it still was very noticeable as the operator – the force required to feed the work through was way down, even in comparison to blades that were pristine, razor sharp, on a powerful table, this blade was very nice to use.  There is a downside – obviously the blade can, and will flex a lot easier, and so in a difficult grained wood, it is more likely to try to follow the path of least resistance.  You would not think of coving with this blade for example.  However, understanding its limitations, this is still something that is worth having in your arsenal, particularly if working with expensive timbers where you want to minimise wastage.

The cuts:

Melamine (Particle Board Backing)

Top Edge

Bottom Edge

The blade states on it that it is excellent for laminates.  Unfortunately, the results say otherwise.

KD Hardwood Rip

A very acceptable rip of hardwood, with minimal scoring. This blade ripped very easily – the function of the thin kerf made these cuts a breeze.

Treated Pine Rip

A good rip of treated pine, with little surface defects.

Softwood (Pine) Rip

An even better rip of pine, with an excellent finish.

KD Hardwood Crosscut

A very good crosscut of hardwood, with little breakout. The white lines are a feature of the wood, rather than caused by the blade.  The combination nature of the blade had no trouble going from ripping to crosscutting.

Treated Pine Crosscut

A pretty good crosscut, the fine scoring is apparent here as well, with most fibres cut rather than torn.

Softwood (Pine) Crosscut

A similar result to treated pine, with a reasonable crosscut.

One Response

  1. […] next review from the “Battle of the Blades”. The CMT 271.250.43M Thin Kerf, 42 tooth combination […]

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