Is it safe (for the machine motor, for example) to set the Domino 500 to cut 28mm deep by 10mm thick mortises on both sides of a joint, and custom cut the 10mm by 750mm Domino bar-stock to 56mm lengths (2 X 28mm) for an 6mm longer Domino? Will the gain in strength of that joint be very much stronger than a regular 10 X 50mm domino? What if its multiplied by 2 or 3 Dominos? Not sure my math is correct but it looks like the gain in glue surface area would be a little more than a square centimeter for each face of each domino. Is that really significant over just using a standard 10X50 Domino (usually 2 or 3 per joint)? I'm not working on any particularly tough woods, it's usually true mahogany or Spanish Cedar, and most joints are two or three Dominos, and most of my projects are chairs. Should I just buy the XL!?!? I bought the 500 before the XL was available, so I'm just trying to get the most out of the 500 without having to spend the extra for an XL. Thanks.
Longest safe domino size for Domino 500
- Thread starter DrNono
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reservoir for extra glue,think condom(couldn't resist)
Holmz
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Even the 5-mm ones are pretty strong.
I suspect that the domino would be stronger than the base material (cedar, mahogany)
Probably stringer in tension the longer the domino is as the force would be shearing of the glue joint.
In sideways shearing of the domino, I am not sure. If the domino is longer then it would have more material to spread the force over to provide break out strength, however if the base material has a long unsupported length then it could fail at the root where the mortice ends.
There is one way to know for sure, and that is to make a joint and beat on it to the point of failure.
But these seem incredibly strong.
If I had a 500 - I would try a 6-mm or 8-mm and throughly put the joints to the test. If the wood has a lot of area then two 6-mm might be better than a 10-mm?
I think a picture of the joint and the forces imposed upon it, would help people to answer in a better and more thorough way.
I suspect that the domino would be stronger than the base material (cedar, mahogany)
Probably stringer in tension the longer the domino is as the force would be shearing of the glue joint.
In sideways shearing of the domino, I am not sure. If the domino is longer then it would have more material to spread the force over to provide break out strength, however if the base material has a long unsupported length then it could fail at the root where the mortice ends.
There is one way to know for sure, and that is to make a joint and beat on it to the point of failure.
But these seem incredibly strong.
If I had a 500 - I would try a 6-mm or 8-mm and throughly put the joints to the test. If the wood has a lot of area then two 6-mm might be better than a 10-mm?
I think a picture of the joint and the forces imposed upon it, would help people to answer in a better and more thorough way.
I'd recommend sticking w/ what's in the supplemental manual. Although I can't say for sure that there's a specific harm in doing 28mm x 10mm with the 500, I wouldn't advise it. When in doubt, go by the book.
(And as a member of the Festool marketing team, yes, I definitely think you should be the XL. [wink])
(And as a member of the Festool marketing team, yes, I definitely think you should be the XL. [wink])
tjbnwi
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If the machine is not harmed by cutting a 28 mm deep mortice in one piece why would a 28 mm deep mortice in the other piece harm it?
I don't think you find an appreciable increase in strength.
As noted the tenor needs to be short with reliefs so you don't hydraulic lock the tenon putting it in the mortice.
Tom
I don't think you find an appreciable increase in strength.
As noted the tenor needs to be short with reliefs so you don't hydraulic lock the tenon putting it in the mortice.
Tom
tjbnwi said:
Just out of curiosity. . . It appears to me that all the other depth stop setting cut slots just slightly deeper than the stated amount. For example a 15mm setting cuts a 15mm+ deep slot. Why wouldn't that hold true for the 28mm setting also. Thus, putting a 28mm tenon in that slot shouldn't cause any hydraulic locking problems since the slot is still slightly deeper than the proposed tenon. Just wondering... I actually don't understand why the 28mm setting is available to use on the 500 since none of the 500's tenons are long enough to use that depth.
grbmds said:
Remember that the bottom of the cut is not flat, it has a curve to match the sweep of the cutter. If you measure the depth of cut be sure to measure it at the edge.
For me I wish that it had a 30mm depth of cut because if you are using 50mm dominoes and going into 25mm thick material on the flat you have to offset so as not to cut thru. 20mm on one side and 28mm on the other doesn't fit a 50mm domino and you have to cut them down.
tjbnwi
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grbmds said:
The tenons are 2 mm short if I recall correctly. I'll measure a few tomorrow.
The 28 setting allows you to plunge 28 into an end or edge grain then use 12 to plunge into face grain. This allows you to use 6 x 40 Dominos. I do this all the time to join 3/4" material.
Tom
tjbnwi said:
Exactly right.
Seth
I have used a 3/8 drill bit and chisel to deepen 10mm Domino mortises for a wide screen door. The Domino slots act as a guide for the bit. This worked pretty well, but took a long time and I went out and bought a DF700 soon after. Although I rarely use it, I'm really glad I've got the bigger model; it's allowed me to be cost effective on some really fun projects. The 500 is what I find myself using 90 percent of the time.
Cheese
Member
w802h said:
An aftermarket extender is available...it's called a Forstner bit. I've extended the depth of a 10mm mortise by setting up the board on a drill press and using the original Domino opening as a guide for the Forstner bit. Easy does it...
Seneca Woodworking makes a long 5mm cutter for the XL700.
http://www.senecawoodworking.com/products/5mm-cutter-for-domino-xl
Another reason to buy the XL700 if you have the money.
Jack
http://www.senecawoodworking.com/products/5mm-cutter-for-domino-xl
Another reason to buy the XL700 if you have the money.
Jack
