There are many solutions to your problem, but this is the way I would do it. I would use a "threaded insert" on the table portion of the legs and a machine bolt or screw on the removable part of the leg. See below for an example of a 3/8" threaded insert: http://www.constantines.com/product.asp?0=234&1=233&3=576
A 1/4 inch insert may work fine.
Drill a hole through the center of the removable part of the leg and countersink it on both sides. Insert a bolt that matches the threads of the insert through the hole in the removable leg. There should be a washer under the bolt head and a washer plus two nuts on the other end of the bolt. The bolt head and nuts should all be countersunk below the surface of the removable leg, and the bolt should extend out to the depth of the threaded insert. Drill the correct size hole for the threaded insert (to prevent splitting of the wood). Thread the insert into the main leg portion, remove it, coat the outside of the threads with epoxy, and re-insert it into the main leg portion. Make certain that you don't get epoxy inside the threads!
The removable leg portions should screw easily onto the main leg portions.
- 15 Old House Features We Shouldn't Abandon
- 13 Lazy Cleaning Tricks for a Spotless Home
- Laundry Room Ideas to Knock Your Socks Off
- Insanely Easy 60-Minute Home Improvements
- 12 Sheds You Could Live (or Work) In
- Assembly Required: 15 DIY Kit Homes
- 7 House Sounds You Never Want to Ignore
- 10 Surprisingly Simple Woodworking Projects
- Worth It: 8 Renovations That Pay You Back
- Organize Your Life with 12 Dollar-Store Buys
- 9 Totally Amazing Mobile Home Makeovers
- Don't Make These 7 Mistakes in Small Spaces
- 16 Sneaky Storage Ideas
- 15 Totally Unexpected DIY Flooring Alternatives
- 7 Easy Budget-Friendly Backyard Makeovers
- 10 Closet Cures That Cost Less Than $100
- 11 Easy DIY Projects to Declutter Your Home
- 10 "Zero Dollar" Garden Hacks
- 10 Killproof Plants for a No-Effort Landscape
- 9 Insanely Easy 1-Hour Backyard Projects