This is an updated version of my original tire (tyre) jig, also available on Cults here:- https://cults3d.sitegames.net/:2017601
Tire gluing jig for slim 2WD 1/10th scale off-road buggy front tires.
Gluing the front high sidewalls of rubber tires is a must for racing on high traction surfaces (dry grippy astro, carpet etc.), to prevent traction rolling.
In one of the images ed you can see the gap on an unglued Cut Stagger sidewall Vs the same tire once in the jig.
These jigs are designed to give you a low profile tire with minimal sidewall movement.
They’re also designed in a way that allows you to work around the jig incrementally tightening the tire within the jig, giving an even squeeze onto the wheel and avoiding a pinch point of rubber, which you often find with a number of other designs (or even using a hose clamp!)
They have locator lugs on opposite sides to guide each section into place.
The key difference with the MKII is the introduction of a slot to slide in a thin M3nS (Metric 3mm nut Square), meaning the bolt has a secure anchor.
[NOTE: These are the THIN M3nS (≤5.5mm x ≤1.8mm) nuts!!]
I personally don't believe this is strictly necessary however, a couple of people have requested a design change of this nature and, I have noticed that when you’re using tires with inserts the tension on the bolts is heightened, so it can only help?!
NOTE: Since I captured the images I've updated the design to;
Move the nut slot nearer to the screw head. The tolerance of the machined nuts seems quite varied and some just fall out when the bolts not in them so, with the slot moved you should be able to slacken the bolts further to insert the wheel without the bolt leaving the nut.
Added a through hole to the underside of the nut. Just in case you needed to push the nut out again then you can without ruining the jig piece.
To use -
1. First I would test the nuts with your bolts before inserting into the jig, I’ve bought a few and found the threads to be knackered out the packet.
2. Next, insert the x6 thin M3nS nuts into the slots, push them down and look down the bolt hole to make sure they’re aligned for the bolt to screw into.
3. Build the hoop (without a tyre at first) by inserting and tighten the x6 M3x14 bhcs bolts. I recommend that when tightening the bolts to do it by hand and not using an electric driver. When the bolt gets to the nut for the first time it might take a little fiddling, you might find you need to remove the nut and rotate or switch out for a different nut, obviously you shouldn’t need excessive force to screw the bolt through the nut, you’ll strip the bolt thread or it’ll get locked up.
4. Once the hoop is built then slacken each bolt off equally, enough so you can slide a wheel, with tire fitted, inside.
5. Wiggle the wheel about, find the sweet centre spot, so it’s all even side to side
6. Work around incrementally tightening the bolts back up.
7. Apply super glue (I go for a couple of applications)
I strongly recommend printing with a brim, helps prevent the thin end of the piece from lifting off the bed.
I also recommend printing with a 90% infill modifier around the nut slot end of the clamp piece, to add strength.
150924 stl Update - I've moved the nut slot a bit further back for more strength, when under pressure with a wheel and tyre inside. Also added a hole on the inside curve, if you need to push the nut out (per updated description above).