The Not So Cool Mini Buggy Build

[n1kogr]

new chain tensioner in.. Much simpler design without use of a spring. So far i rode the crap out of this buggy for a good 2 hours and i had absolutely zero problems with the chain falling off even with me beating on it so hard even jumping it on a lil hill a few times. So far the buggy is holding up great and its a blast to drive only thing ive noticed is my lower a arms have gotten a tiny bit of slack and turned at full lock i can see both wheels slightly jerking around.. other than that i am very happy!!!!

 

[brandongeiger2]

Is that a 420 or 428 chain? Because I was wondering if its 428 where you got the sprocket ive been looking for one that would bolt up to an aluminum hub like that.

 

[n1kogr]

its a 420. i got it from bmi's clearance center with the hub included

 

[brandongeiger2]

Oh okay than thanks

 

[n1kogr]

uhhh ohhhhhh i think something broke

 

[machinist@large]

Soooo, just how much air time did you get before the final landing? More than a skateboard at the "X Games"?

Seriously, that's pretty much a textbook example of cold lap. The only reason it lasted as long as it did was because the area of greatest penetration was at the bottom.

Looking at the parts in question, it looks like these were premade parts?

 

[OzFab]

Well, you just outdid mysteryboy. nothing broke with his wheel toss.

That's gonna be a fun fix for you. Murphy's law says "if one side broke, the other side will break eventually"

 

[B man]

heres a trick. If you try this setup again then when you make the spindle drill the hole the size of the bolt you going to use and stick it through the back side then weld it from the back. should end up much stronger.

 

[OzFab]

You don't think the big hole in the back will weaken it?
Start with thicker wall material, that'll make it stronger

 

[n1kogr]

my plan is go get some thick plated steel and drill 5/8 holes in them and then go get a grade 8 5/8 bolt and use both sides of the spindle to weld it to opposed to the one side like this.. I think it will beef up the spindles pretty good

 

[n1kogr]

Started the spindle project but i got a little problem.. I went to lowes and got two 5/8 by 10" bolts but they have a little play when i put them in the hub bearings. Anybody know where i can get two 5/8 by 8" spindle bolts??

 

[n1kogr]

Pics

 

[B man]

Those look alot better. also when your done. grind em down good and put a good coating of paint on them.

 

[n1kogr]

Thats most defiantly in the plans i just need to figure out what im going to do with the bolt

 

[B man]

Thats most defiantly in the plans i just need to figure out what im going to do with the bolt

wait. are your bearings us standard or metric? cause 5/8" is 5/8" no matter where you get it or in what form.

shouldnt have play if there 5/8'' bearings.

 

[OzFab]

They may be 17mm. 5/8" = 15.87mm. That's a difference of 1.27mm or 0.05". 11/16" = 17.4625mm

You should've waited to weld the front plates on & fed the bolt from the back; they'd be much stronger that way. How hard would it be to cut them off?

 

[n1kogr]

I am going to feed the bolts from the back. I just have to drill the holes pretty easy then slide the bolt through... The hubs are from bmi and say they are 5/8 inner diamiter bearings but the bolts have a tiny bit of play as the old shafts fit more snug. Maybe ill bring the hub with me and see if they have any metric bolts of that length to fit

 

[fowler]

Well the bolts are probs not acctually 5/8
They never designed the bolts to be axles, the sizes are just a guide to help u choose the size u need
16mm is the best bet

All the bolts will be a tiny bit differant
How much play is "some" play

If u want a perfect fit then get some 17mm steel bar and get someone to lathe u up some accurate ones

 

[OzFab]

I am going to feed the bolts from the back. I just have to drill the holes pretty easy then slide the bolt through...

Fed from the back & welded to the back aren't the same thing. How much access do you have from the back; from what I can see in the pics (we never do see the back) it's little to nothing.

The hubs are from bmi and say they are 5/8 inner diamiter bearings but the bolts have a tiny bit of play as the old shafts fit more snug. Maybe ill bring the hub with me and see if they have any metric bolts of that length to fit

Do you have vernier calipers? Measure the two shafts & see what you get. Also, measure the bearing.

Remember that, when a thread is cut, the OD of the thread ends up slightly smaller than the specified size. If your bearing is sitting on the thread, that's where the extra movement wil be.

Also, just because a bolt is 5/8" doesn't necessarily mean the shaft is 5/8", just that the thread is 5/8"

 

[n1kogr]

More work done on the spindles just need to weld them up front and back (correct bolts found)