Bobs 2024 Build Off Build

[bob58o]

So I unnastan what i'm looking at, (I'm purdy dense) the rectangle tubing in pic #1 with all the good stuff on it, is the main frame? No suspension?
That's my guess. 1.5 x 2 inch tubing?
You have a way of slotting the mounting points for the engine/jackshaft/axle? Just wondering about adjustments.
I think I read somewhere the tubing is .120 wall? This is a mini bike? Or an outrigger for a dual engine mega ton transport?
The tubing certainly up to the task if the former be the case. I like the heavy duty look that expresses.
Nice work! Just beware slippage at mounting points that are subject to our friend Tork! Never underestimate that!

Main frame yes.
No suspension on this beast.
1-1/2” x 2-1/2” x 1/8” rectangular tubes.

The pillow blocks have slotted holes which allows me to adjust the jackshaft and the axle shaft. I think each slot is 19mm. A 1/2” bolt leaves only around 1/3” of adjustment per shaft.

I’ll have to use a slotted engine mounting plate but should be able to adjust both the TC belt and the chain tension.

The outside of the main frame rails are about 15.75”apart leaving 12.75” in between the inside of the rails.

The wide bottom allows me to center the weight of the engine, drop the engine a bit lower, and allows space to mount the brake caliper in a tucked away location tween the inside of the rail and the tire.

I’m thinking somewhere around a 48” wheelbase.

Still not sure what I want to do for the rest of the frame.

 

[Rat]

Pretty sure Tork and Twerk are related somehow

 

[Master Hack]

Not much adjustment on the bearing blocks…
Please don’t drill and bolt all the way through both sides of the tube. Make some tee bolts to use inside the tube. It’ll look and work much mo bedder.
l see ya haven’t yet.
Looks good, and it’ll be hella heavy duty!

 

[Rat]

Not much adjustment on the bearing blocks…
Please don’t drill and bolt all the way through both sides of the tube.

Dumb question...
Aside from the obvious crush risk, why not bolt all the way through? Especially on something with a thick wall?

 

[Master Hack]

Crush risk is a biggy, appearance is another.
Bolt all the way through and ya have, in this case, the leverage of a 3.5 inch bolt trying to wallow out the holes. .120 wall isn’t that much when ya consider clamping force with tork and twerk working on it. Put a piece of 1/2 lD tubing inside the square tube to run the bolts through is one way, but tee bolts be mo bedder, as well as looking mo bedder. Make a tee bolt with some .120 or .187 flat stock cut 1 x 2 or so and ya have a nice big washer inside. Then ya get to f**k with em everytime ya unbolt things and they fall inside the tube.

 

[bob58o]

Mrs Esterhaus definitely has some heft.
But it’s not her duty; it’s her booty.

 

[busted_blocks]

Crush risk is a biggy, appearance is another.
Bolt all the way through and ya have, in this case, the leverage of a 3.5 inch bolt trying to wallow out the holes. .120 wall isn’t that much when ya consider clamping force with tork and twerk working on it. Put a piece of 1/2 lD tubing inside the square tube to run the bolts through is one way, but tee bolts be mo bedder, as well as looking mo bedder. Make a tee bolt with some .120 or .187 flat stock cut 1 x 2 or so and ya have a nice big washer inside. Then ya get to f**k with em everytime ya unbolt things and they fall inside the tub

Many years ago I'd drill right through the tubing and then tig in a round tube. Then I could clamp safely in that location without affecting the integrity of the tube. It's a bit of extra work but it's a good technique, just not for every situation.

 

[bob58o]

Weekend fun involved downloading and playing with a CAD app that I still don’t know how to use.

This is just for playing around to visualize ideas.

 

[Master Hack]

Looks like ya figgered it out. You designed a great mobile saw horse!

 

[bob58o]

Looks like ya figgered it out. You designed a great mobile saw horse!

lol I was thinking exactly the same. I had already screen shotted this before I read your post.

No need to reinvent the triangle.

 

[bob58o]

Two saw horses?
I see said the GAB-Man who picked up his hammer and saw.

 

[ezcome-ezgo]

Trihedral saw horse.

 

[bob58o]

It looks mo better the lower the engine is.
Pull starting is a young man’s game anyway.
In an attempt to minimize HP to weight ratio, we have replaced the recoil pull start mechanism with a 12V 18AH battery.

 

[Denny]

I thought you were trying to figure out how to build it out of 2”x4”s. Just so you know, wood will not work.

 

[bob58o]

I thought you were trying to figure out how to build it out of 2”x4”s. Just so you know, wood will not work.

Considering my welding ability, it’s very likely that steel won’t work either.

 

[Denny]

You flunked glue and paste in kindergarten?

 

[bob58o]

How bout zip ties?

 

[Denny]

Just make sure you cut the ends off and deburr them. Those scrape cuts are the worst!

 

[bob58o]

 

[Denny]

Bob, a lower or higher center of gravity really does not affect handling on an mc like it does on a car or kart. The reason is you are able to shift your body weight to compensate.