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Saw blade with 24mm bore

Hello, not sure if its the right place to ask.... I'm looking for a new blade for my 190mm compound saw. It requires a bore of 24mm. I've searched and cannot find a blade with this size bore, nor can i find reducing rings this will reduce to 24mm. Does anyone know if such blades are available?

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Brad

It would help if we knew the brand of the saw and even more if you have a model number?

Bosch do have a 24mm adapter ring available overseas, @MitchellMc may have a local contact with Bosch?

A quick google shows that 20mm is the common bore size for that diameter of blade.

beebee

Sorry Brad, a model might help.... Its an old 800w GMC MS190

JDE

Beebee

Good luck with that one. Have you tried getting a bush for say a 22mm to blade bore size and filing it out with a round file to 24mm that way you could swap to a more common blade. You would only need to take out 1mm all around or get a 24mm, 15/16 drill bit and drill it out.

JDE

MitchellMc

Hi @beebee,

I see you have already received some advice from @Brad and @JDE which is fantastic. I thought I would mention it might be worth considering an upgrade to a saw that runs a standard blade. When you add the price of the blade you are looking for and potentially an arbor bush pack to suit it you're getting close to half the price of a new saw. The Ozito 210mm 1600w Compound Mitre Saw is double the power, has a larger blade (which is included) and a three-year replacement warranty all for $99.

I would imagine the "old 800w GMC MS190" might have a limited lifespan left and it would be a shame to install a new blade on a saw which could possibly stop working in the near future.

Mitchell

Brad

A good test of a mitre saw is to carefully put pressure on the side of the blade to see if you get movement. My Bosch monster has none noticeable and my cheep no name has around 1mm sideways movement.

You can buy 180mm blades with a 30mm bore and shop online for a bush. I don't feel confidant that I could drill out a standard 190mm blade with a 20mm bore to get it to fit and run true, so as Mitch says upgrade time might give you the best result.

gdownie

On the shaft the backing plate comes off and you can turn it around it has a 20mm bore.

Noyade

That's what ELU used to do @gdownie - by turning the inner flange you could alternate between a 30mm or 32mm bore.

EricL

Hello @gdownie

Welcome to the Bunnings Workshop community. It's sensational to have you join us.

Thank you for sharing your knowledge regarding compound saws. We're keen to hear more about all your projects and plans around the house and garden. Please feel free to reach out whenever you need assistance or would like to share a project with the community.

Eric

Nailbag

Hi @beebee

GMC in the early days used US sized blades on both their mitre and circular saws that had bores not standard to AU available models. This meant you could only source limited replacements from them.

You can't/shouldn't attempt to physically resize (drilling/filing) any other blade to fit without a reduction ring. Doing so will most likely unbalance the blade in high-speed causing vibration. You would be much safer to take @MitchellMc advice on purchasing a new saw.

Regards, Nailbag

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