Welcome to Matus1976's Akira Bike Project - Building a fully functional high performance recumbent motorcycle inspired by Kaneda's ride in "Akira"
After some time at Crazy Horse, I did finally get my shop space setup. It was a little crowded, and I had no power for my welding equipment.
These are the motors we build, these are the engine cases, and this is a before and after of some of the 4th Axis machining operations. CNC machines can have an aribtrary number of Axis, they are not limited to the 3 you might think of in physics or cartesian co-ordinate systems. Basically like a typical axis it is any plane the machine can move along, so you have your conventional X,Y,Z axis, which is up/down, left/right, and forward/back. Basic machines are 3 Axis. In this machine we have a 4th axis installed, it is the red block on the side, it has a rotary table which the engine case is bolted to.
Shortly after my arrival I took a trip down to Oklahoma City to pick up our frame Jig made by Sam Well's. I was disappointed I didn't get to make the jig, but Sam is the best in the business.
Here is our Jig with a frame in progress mounted into it. This is a good reliable jig with numerous rigid mounting points but which also allows for easily removing the entire frame after welding. A frame jig holds all frame parts in place while they are being welded together. This thing weighed probably 800 lbs. Ok, on to actually making some bike parts First up, I was unhappy with my front end parts and decided to remake them on the CNC, it would be a good part to learn on as well. First up, is the fixture for holding the part.
So here is an aluminum block machined square with two holes in it for bolts. The intention is to bolt the work piece to this, and then clamp this down inside a machinist jaw. It's interesting in machining that sometimes the most difficult problem is how to hold a part while you are machining it. A good machinist will keep all the fixturing in mind when designing the part, and our machinist joked that he would often get parts that it was just completely impossible to clamp it down. Sometimes it can be quite a puzzling challenge.
So here we see my part ready to be made. The two holes in the middle were drilled to match the holes in the other block, and then this piece is bolted down to that small block above, and that small block as clamped in this vice. A quick run was done of the outline just to make sure the part would fit. This piece is thicker than the final piece, so the messed up outline is just removed. Good thing we checked because it would not have fit. I had to make do with scrap pieces and this one just barely worked.
So here it is, completed. You can clearly see why it had to be held from below with a small block, because the machine cut the curved outer shape and holes all the way through the work piece, so you couldn't hold this with the vice grip from the edges. It turned out though that the piece could move a little no matter how much you tightened those bolts down. So this was a second piece and the block was remade with threaded holes instead of straight through holes
So here it is next to the original. This is the leading link. The large hole on the bottom takes the whole weight of the front of the bike, transferred from the forks, and the large hole in the middle is the spindle, so I wanted to beef these holes up and give them enough room to also allow for bearings to be pressed in. The old leading link on the right was cast by hand by me in my kiln in a previous update, and then machined by hand without a CNC
Next was the leading link. Here it is clamped down using the same fixture block I made with the two holes. Again an outline was machined in to make sure it fit. Looks good!
Almost done! Here I started to get concerned about how thin the aluminum section was getting. Worrying these pieces could suddenly break off and go flying. Instead of milling this down from the top, the way I did, it should have been milled from the outside in. Here our machinist re-programmed it to cut the correct safer way.
All done! Here are the two new leading links and the two new caliper mounts next to, on the right, the old leading link and old caliper mount. Honestly I stare at these sometimes I think they are quite beautiful.
Next up was the fork ends. Again I was unhappy with the old ones, which were hand cast and of low quality. Here is a stock 3" diameter aluminum bar cut to length and clamped in the CNC vice.
The top side is flattened now, some holes are drilled and tapped, and the rounded profile in the end is milled in.
Then the part is flipped over and the other side is done.
The front fork mockup
Lastly, it is stood up vertically as the hole in the end is milled in (it's not there yet)
Here are the new fork ends completed, with the fork sticking out of them. Ideally, these would be much better designed, shaving a lot of weight off while keeping most of the strength, and you should never have drastic changes in the thickness of a part (for example, from the fork end to a suddenly very wide thick tube) even just cutting an angle into it makes the transmission smoother. Sharp drastic changes in thickness become places where stresses focus and accumulate cracks. But since this is just a test vehicle that will be only temporarily used, I'm not too concerned about fatigue related failures.
I used a hydraulic press to push the bearings into the leading link and caliper mounts
Next I glommed a tire / wheel from the shop, I wasn't happy with the tire / wheel combo I was using. Unfortunately this one only had holes for the brake rotor on one side, so we stuck it in the CNC and drilled and tapped 5 holes to make it a dual rotor.
The rotors I had around the shop didn't have a large enough internal diameter hole so I put them on the lathe to open that hole up
The Front End, current progress, looking good! It's still missing a piece though...
Next we machined a pair of torque bars out of 1" solid square steel bar stock.
This image shows where they fit, and after the mounting hole was drilled into the back end. The aluminum piece on the left is the caliper mount, this holds the brake caliper, the part that actually squeezes the rotor and slows you down. Notch allows it to rotate about 20 degrees. You might be wondering why I didn't make this a clevis joint or just drilled a hole in it, the main reason is there simply wasn't room between the existing fork tubes and I would have had to remake my entire fork. But the force on these is a pushing force, not pulling force, so the notch should work well.
Around this time I took a trip out to CT to rebuild one of our motors that was from one of Paul Jr's builds. This is the motor that was submerged and damaged from hurricane Sandy.
Here is the completely rebuilt motor, beautiful!
My father and I dropping it off at Jr's shop, meeting Vinnie and Cody
In the Summer of 2013, we had to move our entire shop out of the 10,000 sf facility we had been in for years into a 2,200 sf facility about 10 miles away. Here is my bike project loaded up and being moved... again...
Setting up things in the new shop
Getting everything wired up AGAIN. This is the 7th time I've had to do this
Making room for almost 30 full pallets of motorcycle engines cases, heads, and cylinders. Each palette weighed over 1,000 lbs. Because our palette jack was the wrong size, there was a lot of hand dragging these pallets across the floor of the truck that brought them. Man what a work out. Cross Fit take note
A few months later and we got a VF2 again, here I am with the bike and the CNC
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2013 was a year of slow progress and some major life changes, but by the end of it the front end was updated with new CNC parts I designed and machined and our shop got a new HAAS VF2 CNC which I'm able to use and learning to operate. Look for more parts coming off the CNC
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