I presume you will buy and use a torque gauge from now on?So, I used too much torque on one of my welded studs on my Eve batteries. It broke off near the bottom. I've attached a picture. How do I fix this? Do I drill out the stud and tap a new larger thread in the terminal? I don't have much experience tapping threads. Would I be better off just buying another cell?
Thanks for the offer, but I'm in the Houston area.@neil_99 - Sorry, but I take back everything I said about backing that stud out. I was reading another thread on terminals and studs and found out that the welded studs are stainless bolts clad in aluminum at the base and welded onto the battery terminal. I don't think that stud is going to come out without a fight.
I would take it to a machinist to center drill and then drill to size and tap. I would not drill any deeper than the wide aluminum face of the terminal below the weld. Here is a photo I found in the other thread showing a stainless stud and its welded aluminum wrap.
If you are near Northwest Florida, I'll drill it for you.
I actually have a torque wrench, I was just ignoring what it was telling me because it didn't feel like the nut was near the bottom of the post. I didn't really feel like I was putting much force on it when it broke, but it had clicked. Expensive learning opportunity.Too short for a welded nut. Do as you like and be safe about it. In the mean time I would get a new cell on its way.
And by golly get a torque wrench. https://www.lowes.com/pd/Presa-1-4-in-Drive-Beam-Torque-Wrench
About 3 Nm or 25 in-lbs
That is my fall back. I believe I can get another cell locally, so my shipping time won't be so bad.Why not just grab a new cell instead of worrying about drilling, tapping, welding, or otherwise trying to remove it that could result in fire?
These are 304sIf you go to Docan, I’d be interested if they have these in stock. They are saying 2 months for male terminal EVE 280k
Stainless bolts with stainless nut don’t get along well, then throw in China QC and well you have a problem. I never use stainless with out a drop of oil. I have had them get a little snug and reversed and broke while backing up.I actually have a torque wrench, I was just ignoring what it was telling me because it didn't feel like the nut was near the bottom of the post. I didn't really feel like I was putting much force on it when it broke, but it had clicked. Expensive learning opportunity.
Good point. The place I had heard about is out of 304Ah batteries. Looks like I need to find a machinist in the Houston area.They told me no eta on 304s. Please let me know if they have any.
Be careful when trying to torque that. There's fewer threads than they normally come with and what they normally come with is easy to strip already.I took it to a local machine shop. They got the threaded rod out and retapped a few threads inside the hole. I've attached a few pictures for reference.
This is literally the worst, I have broken spanners, and ended up having to cut several stainless bolts that did this to me (not on batteries), they seize insanely easily without some lubricant.Stainless bolts with stainless nut don’t get along well, then throw in China QC and well you have a problem. I never use stainless with out a drop of oil. I have had them get a little snug and reversed and broke while backing up.