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Background

I would like to buy a dado stack, but 30mm is hard to come buy due to laws forbidding selling them in Europe. Using them for personal use is ok, so I can order from abroad.

Question

I have a Dewalt DW7492 table saw with a "30mm" arbor, but it is 14mm (9/16") wide and 30mm (1") long. It uses a flange washer that centers the 30mm ID blade on the shaft.

blade with flange

arbor width

arbor length

I suspect this is the same arbor as North American models with a different flange.

Can anyone support this theory? Is there anything I should be weary of trying to do this?

Update about the law

This law appears to have gone in effect in 2012. You can find links to the EU directive here, which is defined in Article 12.3 based on this ISO standard.

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    Normal North American arbors are 5/8". If it was me, I'd doublecheck yours with calipers.
    – Aloysius Defenestrate
    Oct 20, 2020 at 19:52
  • Thanks. I'll do that. How much tolerance would you think to be acceptable?
    – ryanjdillon
    Oct 21, 2020 at 6:21
  • From this thread on Fine Woodworking, an alleged machinest says 0.001-0.000, which mean I would need a bushing if my arbor is indeed 14mm. finewoodworking.com/forum/changing-arbor-hole-size-on-saw-blade
    – ryanjdillon
    Oct 21, 2020 at 6:29
  • Totally OT, but why in the world is a 30mm dado stack illegal to sell in Europe???
    – FreeMan
    Oct 22, 2020 at 11:04
  • One saw blade? Fine. Put two or more in a room together and you're asking for trouble.
    – cchoe1
    Oct 28, 2020 at 17:25

2 Answers 2

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I decided to go out on a limb and buy a stack to know for sure, and...

It fits! There is a verry small amount of play before tightened, but any less and the blades would scrape over the arbor. I believe this is a proper 5/8" arbor.

I do not know about other manufacturer's arbor dimensions, but if you have a DeWalt, you may be in luck.

If you are interested in dados and buying a contractor saw in Europe, in addition to the arbor diameter the DWSE942 also has a long enough arbor to support the full blade/chipper stack with some (not all) of the spacers provided in the Freud 6" Pro Dado Set.enter image description here

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  • So can you tell us about your results with the dado blade on the DeWalt, did you in the end use it?
    – Samball
    Dec 25, 2021 at 15:28
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    @Samball It has worked flawlessly. I've mostly cut box joints with it, and they come out perfectly. The smaller diameter blades are more than enough and, in theory, should help it break faster. It appears to break in about the same time as a standard blade.
    – ryanjdillon
    Dec 25, 2021 at 18:20
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The short answer is "no," but I'll elaborate.

The dimensions are very critical in this area since small variances at the arbor can have huge effects at the edge of the blade. Also the motor spindle could have been treated differently for the euro model and it could bend or break.

If the arbor is even a small fraction oversized, the blade won't fit. If the arbor is a fraction too small it would potentially induce a variance in the blade height that could (in theory) cause the blade to bite into the wood and send it back in your direction(kickback) or in the best case just give a very poor quality cut.

There are companies that will sell you a dado set with any sized hole you want for a very small fee for the 30mm size. I can give you my favorite, but send me a private message for that.

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    SE has a PM feature now? Where??? How??? It is OK (especially here at WW, it seems) to make specific product recommendations in answers so long as you indicate your affiliation (or lack thereof) with the mfgr/retailer. It's not OK, however, to ask for product recommendations. "Companies like ABC Corp (I'm a fan of their high quality products) can sell you a dado set with any size arbor you'd like. I think their prices are quite reasonable." or "I work for PDQ Co and we can sell you exactly what you're after." - including links is optional
    – FreeMan
    Oct 22, 2020 at 11:10
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    Well, if it's not against the rules, then the company is Ridge Carbide. I'm not affiliated with them in any way, but I do use their blades on every saw they make a product for.
    – Mr. Mascaro
    Oct 22, 2020 at 12:12
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    I haven't updated the question yet, but after going to measure the arbor a second time with calipers, I found that the arbor is ground on two sides to allow the flange to groove onto it. Measuring from the outside rounded edge, it appears to be 5/8". I'd find it strange if Dewalt made its European arbor only slightly off from 5/8, intended for 30mm blades... seems asking for somebody to try this and have problems, like me :)
    – ryanjdillon
    Oct 22, 2020 at 12:58

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