Fences and Gates - what does this project take?

I don't know squat about what I'm asking. But---here goes: Got a wood privacy fence. One post has a gate on it, and it sags outward. I'd like to put a 45 degree brace on it. The post is over a big slab. I'd have to do something in my concrete to make an anchor for brace. It would need to be something fairly big (deep 1/2" thread, or maybe even 3/4". It would need to go down some to have the necessary holding power. There would be the vertical part. What's the thing that would go around the threaded part and make a connection for a 45 degree angle (probably use small cable for this deal). What do I use to put a good size hole down so that the concrete anchor can work?

See if your hardware store has eyebolts. Get one with 3/8 or !/2 inch thread on the bolt part.
Also get and extension nut and some threaded rod the same size. All together it should end up at 12 inches long. Also get some exterior grade epoxy glue.
Also get an eyebolt for the wood post that fits all the way through the post and gets nutted on the other side. Place washers on each side of the post eyebolt so it does not dig into the wood.
Get aircraft cable that they use for winches on jeeps. Also get the cable protecters for the ends you are going to loop. Get a turnbuckle for the cable also. Place at least 2 clamps on each cable loop. So you'll need 8 clamps.
Drill a 1 inch hole in the concrete 3 feet from the post. Deeper than 12 inches. Fill the hole with the epoxy and bolt keeping the eye level to the concrete. After 24 hours set time place your cable between the eye in the post and the eye in the concrete. Tighten the adjuster to pull the post straight.

Wonderful. Good info.

What's the best way to drill a 1" deep hole? Not sure what tool to use.

rbig,

An inch deep in the concrete isn't going to cut it. You need to go about 3" deep, assuming that the concrete is about 4" thick. If it's thicker than that, go deeper.

How tall is the post? Go a foot less than that horizontally across the concrete. THAT'S where you want to epoxy this eyebolt in. Put an eyebolt in the post a foot down from the top.

Use a 3/16" SS cable with a 'hook and eyed' turnbuckle attached to one of the eyebolts and extend the cable to the other one.

Rent a roto hammer drill to do the hole. Use a 1/2" bit and install a 1/2" diameter eyebolt in the concrete. And if you angle the hole at about a 45 degrees angle back towrds the post you can use a 5" eyebolt.

Simpson epoxy -- they have a small pack that fits a standard caulking gun. Costs about $12. You'll find that at a real lumberyard. I've never seen it in either of the big box stores -- the orange one or the blue one.

What tool do I ask for to go down through concrete 1" diameter, and maybe 12" depth?

First off, you don't need a 1" hole. You need a hole that's about 1/8" larger that the size of eyebolt you'll be using. And you dont need to go down a foot with the hole. The slab that you are dealing with is probably ony 4" thick. If you angle the hole back towards the post you need to drill a hole 6" deep. There's no sense in punching through the bottom of the slab and trying to put epoxy in the dirt.

Rent a rotohammer to drill the hole -- I'm pretty sure that you don't have laying around in your garage or shop.

Simpson epoxy. The small pack fits a standard caulking gun. That's about $12 to $15.

Cable that is 1/8" to 3/16" will work just fine.

Many thanks for great info !!!