I tapped thru but never run the screws that far thru. I like them to be able to move while I'm positioning things. If at any time I find I'm even getting that far in I'll screw up the bottom few threads. I'm actually good at screwing up threads!
I think the issue is that the bolt can bottom out when the nut is being tightened.
Yeah, I'm aware of that but since I have a very limited supply of 3/8-16 anything it's rarely long enough to get all the way thru the nut, let alone to the bottom of the slot. Eventually I'll make a bunch of threaded rods and make the thread on the side that will go into the nut shorter. I did that on my screwless vise when the original fell apart (worthless pressed fit).
My commercial T-nuts just have two chisel marks on the bottom thread, works fine.
Ed
Not my top-quality Te-Co products, in both the 3/8-16 and 1/2-13 sets. Full threads down to about 1-1/2 to 2 turns before they'd break through.
For the record, I did smash a couple of threads with a punch tonite, then screwed a 3/8-16 into it. There was a little resistance and then it cleaned up the threads. Guess I need to try a different tool.
Just for argument sake. (we all like those).
I've heard the story of the stud bottoming out and while tightening the nut it jacks the T-nut up and breaks a chunk out of the table. Maybe we could get Myth Busters involved. I'll give you that when your bolting down a vice the table is totally in compression between the T-nut and the base of the vice. BUT when you use the straps that come in the clamping kit the stud with T-nut on the bottom is pulling the same tensile force on the table (with nothing directly above it) as the bottomed out stud does.
Well if its all the same to you guys, I don't wanna be that guinea pig.
(04-06-2015, 09:06 PM)Vinny Wrote: [ -> ]For the record, I did smash a couple of threads with a punch tonite, then screwed a 3/8-16 into it. There was a little resistance and then it cleaned up the threads. Guess I need to try a different tool.
Try using a ball bearing to purposefully roll over the bottom thread.