When attaching wood tops of any kind whether it be a wood countertop to a cabinet or a table top to a table base you need to allow the top to move or it can split.
Attaching wood table top to metal frame.
Attaching a wood table top to a metal frame i would suggest enlarging the holes in your brackets on one side of the table.
Question i have a salvaged metal frame from a printing press and want to put a nice table top on it.
Above is an example of a finished table top using four simple metal legs attached using a kee klamp flange fitting for each leg.
Bolts need to be threaded completely.
Clear bonding gels can be a very strong adhesives.
The shape of the figure 8 fastener allows them.
I would also suggest using shorter screws with about 3 4 into the wood.
It is an inexpensive and easy to install and allows for a great deal of wood movement.
Sheeting clips were used to attach the plywood top to the base of this table.
Use flanges to attach the top if your table top is made of wood for example build the table frame using kee klamp flanges.
Flat twin circle clip figure 8 clip or figure 8 fastener easy to install and inexpensive.
Attaching a table top to a metal frame fasten in a way that allows movement at the connection.
Use 1 inch corner brackets to secure a plywood or particleboard tabletop to the frame.
My concern is to figure out how to attach the table top without risking it splitting.
Drilling the guide holes is done to slide the bolts on the wood into the metal frame.
The makers of museum gel claim their product can hold glass in place even through an earthquake.
Screw the enlarged side with a washer and pan head screw just snug it up leaving room for it to move then screw the other side solid.
Bolt the wood to the metal frame by pre cutting holes so the bolts fit through.
Secure the corner brackets.
Elongate the holes to allow for wood movement.
Another option is to build a complete table frame instead of attaching each individual leg to the tabletop.
Attaching a plywood tabletop.
If you re looking to keep the glass top stuck to the table frame more permanently this may be the best option.
You can use bolts that are made specifically to screw wood to metal or steel if you re attaching a wood flush.