I would recommend figuring out what your axle setup (hardware wise) will be before buying the joints. That will dictate the large joint size you need. SRM uses ~6mm screws for the radius rods on their more robust HD 3 links so I don’t see a reason to go larger than that.
depending on your manufacturing capabilities, you have various options, however I think the most "plug and play’ soliution would just be to use the SRB bushings.
Im still curious to how these trucks steer differently to a rkp with the axle in the centre of the bushing seats.
Lets say we put a joint bearing in the bushing face and a needle bearing in the pivot cup seat so that there is no play , place both trucks at the same angle towards the ground, wouldnt that kinda be the same thing?
No, because the forces would still allow slop with that idea. Flipsky just came out with a truck that uses a spherical bearing pivot cup in an rkp if you want to check that out.
The srb nkp has a huge lever arm to resist deflection/slop. Also the bushing and center rod end bearing combination offer proper bushing utilization. Where shoving a spherical in an rkp isn’t as good in that respect.
Oversimplified but gets to the core of the advantage.
Hi @MoeStooge - how much motor shaft length is needed to run the pinion gears?
I cut my motor shafts to 24mm long to fit BN gear drives, and I’m wondering if I can still use those motors on the SRB setup.
I feel like this depends on where your slave gear sits on the setup.
almost 1"
that’ll do. you only need 19 - 25mm ( 3/4 - 1") to get through the motor mount and have enough purchase for a grub.
don’t thinks so. usually wheel gear is aligned to pinion zone which is aligned as close as reasonable. to the motor mount.
Wouldn’t that vary on hub and slave pulley spacing? Or is it not really a thing? I didn’t get to the step of meshing theming
perhaps, but literally all the variables are adjustable and the least likely thing you’d do is move your pinion further out when you can move your spur gear in.
Looks like it will be close for me because I’ll be using 30mm to 44mm adapter plates.
24mm - 3.2mm (mount) - 5mm (adapter - guessing here) = 15.8mm shaft left over (0.62").
I wouldn’t get the axle all the way through the pinion, but perhaps I have enough on there. The set screw would be on the inside next to the mount plate.
well another life hack is to use two bolts only, and you can make it fit in the slots of the srb mount without an adapter.
If it’s enough axle for the set screw you might be fine? Set screw plus green loctite, could be enough
Brian out here stopping the threadlocker racism
Yeah that’s what I’m thinking too. I’m checking gearing options for the lacroix and the 44, and swapping the 151kv reachers onto the race board just makes more sense.
Puts both boards at 43mph average, and >500 newtons of force.
The reachers don’t already come with 30mm mounting holes?
My 6355 does.
v4 does, v5 does not 
Well they sorta do. But it’s used to secure the mounting plate tor he stator. In theory you could just get. Longer m4 to replace it thru the Motor mount into the plate and the stator.
We run the pinion very close to the wheel sidewall and as close to the motor plate as possible. Excess gets cut off due to interference.
How much preload is right on the bushings? Should there be a gap or should i tighten these down more?
Close the gap is where to start. 1/4 turn does a lot.
