Project Microtrac

[Steinbruchsoldat]

Ok guys, i`m building the Quadrotrac for several years now, and i can`t see when i`ll finish it. So i decided i need something simple just to drive around. Since i can`t use the Motodog any more i found a victim pretty fast :

The idea is to build a little tractor like thing, really easy and without rocket science, so there`s a chance to actually finish it. First mockup:

Cut everything off that i don`t need anymore:

Here`s the secand transmission that`ll go in. This gives me 18 forward and 6 reverse gears:

Here`s the input shaft:

Turned a flange with a register for the sprocket:

Flipped it around and turned a register for the input flange:

Transfered the holes:

Put it together nice and tight:

And welded it on:

The output sprocket is really beaten up, but i need the inner splined section. Btw. i know that the case is cracked. Someone repaired it a long time ago and it wirked fine since then. Since i said no rocket science i`ll leave it just like it is. Wait, maybe i`ll run some beads over the crack...:

It`s hardened so i put it in the oven to anneal it. :

Then i mocked up the front transmission mount:

Need to build th axle fist before i can start on the frame, so i cut off the drive sprocket from the Motodog:

Cleaned it up:

Flipped it around and turned down the other weld bead:

And pressed out the axle:

Then i reamed the hole:

Here`s everything that`ll be mounted on the axle:

Turned a flange for the brake disc:

All the finished axle parts:

 

[Steinbruchsoldat]

Started by cutting the square tubing for the frame today:

Then i roughed out the front crossmember:

And bored it to size:

Then i turned the front axle bearing housing:

Welded it in:

And pressed the bearing in:

Tacked the frame:

And mocked it up:

Then i turned down the annealed output sprocket:

And bored out the new one:

Fit`s like a glove:

Looks like i ****ed up something with the frame and the final drive:

Now i like it better:

How it looks all together:

 

[ripperj]

Cool!
I like following your strange creations.
What are you going to do with it?

Sent from my Passport

 

[Steinbruchsoldat]

No real plans. Cruising around town and hoping there are no cops around maybe? Maybe i`ll also build a blade for it to clear snow...

Made some mounting plates for the axle bearings:

Tacked them on:

Started turning the front axle:

Located the holes for the stub shafts:

And drilled them:

Turned the first stub shaft:

It`ll looks somehow like this. Will probably shorten the stub shafts a bit.

 

[ripperj]

Cruising around town would be cool, here in the US I would end up in jail.

When I was a teen my dad and I made a trike with a BMX bike front end and a typical go cart type rear, I had a blast with that thing and it would go anywhere . I kept breaking the spokes and bending the rim on the front wheel.

 

[Steinbruchsoldat]

Wouldn`t be too funny if i get caught by the cops here either... :Wow1:

Turned the second axle stub for the front axle today:

Tacked them on:

And mocked it up:

Then i put in a frame crossmember:

And made the rear tranny mount:

Then i made some tabs for the seat mount:

Bored out a piece of pipe:

And pressed in some brass:

Reamed it out:

And put in a grease zerk. This wil be the pivot for the seat mount:

Also made some seat mounts and tacket them on:

Starts to look like something:

 

[ripperj]

"Starting to look like something"
I'm not sure something is correct, "neat, cool, crazy, bizarre " maybe closer
Doesnt look safe for a 3 year old!

Sent from my Passport

 

[Steinbruchsoldat]

Started by notching the seat mount strut yesterday:

Then i put it together:

Made some mounts for the shock:

And welded them on:

Then i noticed that the spring rate was way too low, so i had to think of something else:

Now it works great:

Also need something to tow a trailer and a tow hook. So i took a plate and drilled some holes:

Welded on a small rod eye:

And put it on:

Today my rims arrived after going up and down through the whole country for the last 1,5 weeks. The tires appeared to be in a much better shape than it looked like in the auction pics so i decided to use them:

So it was time to machine some wheel flanges. Had a piece of 6" round that i cut in half :

Welded on some short pieces of pipe to grab it in the three jaw chuck:

Turned the flanges:

And put in some centers for the bolt circle:

Then i drilled them on the drill press:

Now i could mount the flanges on the axle:

And put the wheels on. Should be a roller by tomorrow.

 

[Steinbruchsoldat]

Started by turning the front axle stub shaft today:

This is how it`ll be mounted:

Cut up a rack and pinion steering:

Turned a tie rod extension:

Should go in somehow like this:

Turned a bearing seat for the steering column:

Pressed in the bearing:

Turned the upper part of the column:

All the pieces together:

For the steering wheel hub i cut off the end of an old vice handle:

Turned a register for the steering wheel:

And milled a snug fit square on the column:

Cut a thread for a set screw:

And welded it in:

The upper steering column completed:

And tacked in:

Aligned everthing in the lathe before welding:

Welded everything up:

Mounted the rack:

And the whole steering assembly mounted:

 

[Steinbruchsoldat]

Only things missing for it to be a roller was the steering arm on the front axle. So i started by boring out some round stock:

Milled on some flats for the bolt:

Slit it:

And drilled the cross hole:

that`s how it goes together:

Was able to salvage a piece from the Motodog for the steering arm, just had to cut a radius:

And tacked it on:

Put down some welds to prevent it from falling apart when i remove the jack stands:

And then i just had to put the tank back on even if i didn`t want to use it. I have to say that i really like it:

 

[2002maniac]

LOL! That thing is ridiculously awesome! The machining looks great.

 

[Steinbruchsoldat]

Thanks. :bike_rider:

Build the clutch system today. First i mounted the pedal to some flat stock:

Cut a thread:

To mount the clutch handle:

Milled a bracket for the cable:

Tacked it on:

Finished:

 

[Steinbruchsoldat]

Started with the brake pedal today. Had a hard time figuring out how to clamp it for milling:

Worked out better than i thought it would:

Bend up a lever:

Tapped the pedal:

This is how it should go together:

 

[ripperj]

That fixture plate is nice, how long did it takes to drill and tap, what size is it?

Sent from my Passport

 

[Steinbruchsoldat]

Luckily i bought it like that. It`s about 220mmx500mm and has about 678 M8 holes.

Continued working on the brake today. First i turned a pushrod:

Milled on some wrench flats:

This is how it goes together:

Bent it a little:

Perfect:

Then i turned a bushing for the gas pedal:

And brazed it on the other half of the vice handle that i used for the steering wheel hub: