I have a little problem with my motor mount. Like I told in my build log, I made my own motor mount and this works quite good. But it is getting lose from my trucks.
Does it have only one bolt for clamping?
If so, then that could be part of the problem.
You are also using bolts for clamping where you should use set screws instead. They’re made of stronger steel so they can clamp harder.
Another question is, what size is your clamping hardware? Most mounts I’ve seen using a similar arrangement use m6 screws. If yours are smaller, that could be contributing as well.
It haves 3 clamping bolts. And these are machine bolts. I worried that I would rip out the heats of setscrews, I had this problem multiple times with my old mount.
I think the biggest problem is that my trucks are tapered and are slowly slipping of.
I can’t re tighten the mount because I ripped of the bolts head by hitting a rock.
Yh looking at your trucks they seem very much like paris trucks which are a pain to make mounts for without milling or filing down a side. Options for you are buy a proper paris truck mount and replace the diy one, weld the existing mount in place or try and drill out /remove the headless bolt and re-drill and tap. Also when using bolts make sure to use loctite threadlocker to secure those bolts and to prevent any vibrations from the drive system loosening them
If you want to have a more permanent solution then drill a small hole through the mount into the truck and tap it for a screw, the loctite it in place…almost as good as a weld
If you want a better fit and have access to a lathe then chuck the truck in it and turn it down to a constant diameter and ream the mount to an interference fit with it and tap it on with a pipe
I will tell a little bit more about wat I have done.
I custom designed the mount to fit on my trucks. I drilled 3 holes from each other and taped thread in it. Than I put the ring on my trucks and tried to put it on as tight as possible with a hammer and tightened the screws with combination of some locktite.
So the two opposing bolts work against one another - tightening down one works against the other. You want to get the surfaces to mate, not the setscrews. If anything I’d remove one of the opposing bolts and try that.
TBH I’d just weld this guy on and call it a day. It’s not worth messing around with. One and done. Hopefully you get the mount orthogonal to the trucks! Good luck!