How to attach HEAVY tabletop to Base?

[Intex]

I now need to attach a 3" round tabletop to an X-base. The top is probably 100-150 lbs and the base at least 50 lbs. They really arent going anywhere once one is on top of the other, but with little kids I do not want to ytake any chances.

I am currently thinking of using figure-8 connectors inset into the top of the X Base (maybe 4 or 8?) Any better ideas?  These will be put together on site

Pictures enclosed

 

[Dogberryjr]

Dowels and silicone

 

[Alanbach]

The figure eights will work fine. The other alternative would be make four wooden cleats to attach to the inner edges at the top of the base. They would need oversized slots cut in them to allow movement in both directions. They would be permanently affixed to the base and then screws would go through those cleats into the top.

 

[Michael Kellough]

That X looks good enough for a clear glass top!

 

[DeformedTree]

Dowel pin in the center point straight up into a hole, stops shear movement, gravity does the rest.

 

[Intex]

Dogberryjr : wHAT DO YOU MEAN BY dOWELS AND sILICONE ? Outi8ng a rounfd Oak dowel in each leg of the base and corresponding one in top bottom, then siliconing it together?

 

[Dogberryjr]

A couple of dowels to align the two pieces and prevent shear (as described above), and a few daubs of silicone to adhere the base to the top. 

 

[Svar]

I'd prefer a method that keeps two peaces together when the table is lifted. I.e. 8-shaped washers are fine. There is various more sophisticated cabinet knock down hardware, similar in principal to Festool connectors.

 

[Cheese]

I guess I'm a fan of the single dowel in the center along with a couple of small dabs of silicone. The center dowel guarantees the concentricity for every dimension/feature while the small silicone daps provide both a physical connection while also allowing for wood movement. 

 

[DeformedTree]

Issue I see with silicon is when you need to move it again, it will be a problem to get apart.

An alternative could be some velcro pads. Have the pin, and then the velcro to add some hold, but not something that can't be overcome.

 

[Mario Turcot]

Like Cheese, I'll go with a dead center 1" dowel affixed under the top. 8 heavy duty L angle should be plenty to hold the top in place.
L angle 2" 1/2 x 3"

 

[Sparktrician]

Given how heavy that rascal likely is to move, I vote for a sturdy rounded-over dowel at the center of the base set a bit proud of a single domino in each of the four base quadrants; dominoes glued in a tight mortise in the base quadrants; unglued slipping into loose mortises on the top.  And given the weight of the top, I don't think that L-brackets will be necessary.  I doubt that the wind will blow the top off...  [big grin]