T Nuts
T nuts are made to be nailed into wood and provide a threaded nut that stays attached to the wood. A bolt is screwed into this nut. There are three or four spikes that hold the T nut. T nuts do no do well in MDF. You can use hurricane nuts (available from PE) or glue small pieces of plywood (1/4 inch recommended) on the back of the opening for the driver where the screws go through the MDF and nail the T Nut to the plywood.
Home

Introduction

Project overview

Bill of Materials & Costs

Material Properties

Cutting Holes

T Nuts

Manufacturing the parts

Cut List

Top and Bottom Pieces

Brace preassembly

Assembly of Box

Precision Ports

Preparing to Finish

Finishing

Final Assembly

Grill

Final Product

Lay the driver in the hole and mark the location that the screws will go through the MDF. Remove the driver when marked.
Glue small pieces of plywood when the T nuts go through the MDF on the BACK of the piece. I used 3/8 inch plywood, but would recommend 1/4 inch. With 3/8 inch I needed 1/4-20 2 inch screws. 1/4 inch plywood will allow 1 1/2 inch screws to be used.
Place the driver on the piece, aligning the holes to the plywood pieces on the back. Carefully drill 1/4 in holes through the MDF and plywood. Remove the driver, then drill out the larger hole for the T Nut diameter about 1/2 inch deep in the plywood. Check to see that the T nuts work, then hammer the T nut into the plywood.
Copyright 2005, Trtinkerer