https://www.auveco.com/nutserts

How would I insert them into the wood that a screw into them? I didn’t intend to use self-piercing screws, so I would have to thread the inside of the Nutsert?

... without warping the thread. I've used them on metal, and I am sold on the company and the product. They also make a similar system for wood. If you're going to use particle board and your holes are going to be close to the edge, there are plastic inserts that are screwed into an oversized hole with a screwdriver. There are also simple devices for attaching panel that don't use screws. A lot of Ikea furniture use these systems. So they're cheap, available and dependable. If you have a good Ace hardware it'd be a good idea to go see what they have.

Go online and search on Thomas register: https://en.wikipedia.org/wiki/Thomas_Register

https://www.thomasnet.com/

I was a mechanical designer and draftsman in a previous lifetime, I'd be glad to consult with you gratis.

I will attach 4x4 sections to that base. The large screws will anchor the braces that I will use on the 4x4s to the base wood, then I will run smaller screws through the braces and into the 4x4s.

Helicoils are not the only brand, or type, of screw thread insert. McMaster Carr is a huge industrial distributor, who is accessible by their (awesome) website. If you do not have a wholesale account, they will hang up the phone if you try! They have EVERYTHING!

here's a link to some things might work for you! https://www.mcmaster.com/screw-thread-inserts/flanged-tapping-inserts-for-softwood/

looked at. I believe they have distributors that would handle smaller amounts. On my first examination, I didn’t see what I was looking for, but I will follow the link you gave and re-examine.

Their catalogs weigh several pounds, and are NOT easy for "civilians" to get, let alone order from. You have a direct link to what you need there. I've been using them for 40+ years, personally and professionally. On the computer, they will sell things in "personal"quantities - and give both the individual and quantity price.

McMaster Carr appeared to have had the best design during my initial investigations.

The McMaster Carr inserts were too small for the key holes that I will need to make, they are adequate for three smaller holes, though. The standard size goes up to 3/8, the size I need is either 1/2” or an alternative M12 (McMaster Carr only goes up to M10).

I am VERY happy with the Kobalt 24v cordless line of tools at Lowe's. I use the angle grinder and impact wrench on an almost daily basis. I have had the tools and battery for 3 years. Battery lasts a couple days between charges with heavy duty use on both tools. I have left the battery for days and it doesn't lose power in the interim. The tools have a 5 year warranty. The batteries have a 3 year one. That is amazing for a battery. They are brushless tools and they are awesome.

live.

I can find a Tee-Nut that would catch more of the screw.

My guess is that I need to catch at least 25% of the screw if I used a Tee-Nut, otherwise the dynamic loading over time will case problems. One advantage of tangles inserts is that I can stack them in a hole, generating close to 100% coverage for the screw thread.

starting to build. I will check the drill idea, the voltage seems right for what I am doing, along with it being brushless.

For a hammer drill or heavy duty-Milwaukee. I use my Dewalt daily. Most carpenters use Dewalt.

business with them. But he has owned the tools for years. A number of the recent reviews that I read about DeWalt drills implied that the quality had slipped badly, things like the tool dead out of the box or only lasted a few weeks or months. That gave me pause.

Looks like a cordless drill is going to be a diceroll regardless of which brand I buy. I will buy what I hope will be a good one and keep the receipt as well as send in the warranty card. One consistent thing that I read was that brushless cordless drills were better choices that the cordless alternative.

I may even just wimp out and buy a cord drill.

The time is right for buying right now, tis the season. So you want to watch the adds in home depot and lowe's ,always there is a good deal on battery pack drills this time of year.
I have a dewalt 18 volt more than 15 years old ,and 2 bosh 18 volters . You should be able to find a good deal the drill,two batteries and a charger for under $ 100.00 before Christmas. If you are concerned about the defect factor ,fill out the warranty card and send it in. It is just that simple. They mail you a replacement asap. However I doubt you will encounter an issue.