yossarian19
NAXJA Forum User
- Location
- Grass Valley, CA
Right. So I'm building a bastard pack. OEM center pins have a 1/2" head & 5/16" body.
5/16" allen bolts, though, have a head from 0.457" to 0.469". This sounds like nothing, but I was concerned because, y'know, neurosis. I wanted to avoid thrust angle issues (drive wheels out of alignment, steering the car form the rear)
The worst case scenario is you have one center pin mashed all the way forward in the hole & the other all the way back with bottom-of-spec allen heads. So if I'm picturing this right, you can double the difference between that .50 center pin & the .457" allen head, getting .043", for a total of .086" (one screw back, one screw forward) misalignment over ~4 foot (actually 43.5"), serving up a maximum thrust angle of 0.11* - or .01* past the rule of thumb spec of 0* +- 0.1*
So... worst case scenario using 5/16 allen screws... you're still just fine. Maybe some accelerated tire wear. If your axle is moving enough to be worried about shear... your axle is moving too much.
Also... Wolfram Alpha. It's pretty cool. Like Google but nerdier.
5/16" allen bolts, though, have a head from 0.457" to 0.469". This sounds like nothing, but I was concerned because, y'know, neurosis. I wanted to avoid thrust angle issues (drive wheels out of alignment, steering the car form the rear)
The worst case scenario is you have one center pin mashed all the way forward in the hole & the other all the way back with bottom-of-spec allen heads. So if I'm picturing this right, you can double the difference between that .50 center pin & the .457" allen head, getting .043", for a total of .086" (one screw back, one screw forward) misalignment over ~4 foot (actually 43.5"), serving up a maximum thrust angle of 0.11* - or .01* past the rule of thumb spec of 0* +- 0.1*
So... worst case scenario using 5/16 allen screws... you're still just fine. Maybe some accelerated tire wear. If your axle is moving enough to be worried about shear... your axle is moving too much.
Also... Wolfram Alpha. It's pretty cool. Like Google but nerdier.