Author Topic: MessnerMoto - CB750 f2 - Some Parts are now available from build!! (Read 85985 times)

754 · « **Reply #125 on:** November 22, 2015, 11:13:21 AM »

Many trees the line is much wider.. Do you think cast would be safe. ? I do not....

This may help if you build more..
What i was talking about is holding the 8degree angled stub.....in a 3 jaw chuck on the lathe....the handlebar part is INSIDE the chuck .. This would require minimal rough miling on the stub.. 3 spots would do.
Then machine the internal features of the stub.. Then take out of lathe, mount on handlebar..... Then clamp handlebar in lathe chuck... And turn stub round to match handlebar..

On the ones you have now, instead of rounding by hand, machine inside of stub, mount on handlebar, then finish rounding on lathe..

MessnerMoto · « **Reply #126 on:** November 22, 2015, 12:06:23 PM »

Original cb750 top triple is also cast... Yield strength of cast part can go high. Dia casting can produce yield strength above bilet alloys yield strength(look at aa 390 cast alloy parts). Also castings can be hardend to t6.... But I think nothing fancy was done with triples. Cast a356 t6 alloy have yield strength around 160MPa

...for machining we will see how to speed up the process if we decide to make more. I admit the way we did it is currently not cost effective. I will tell abou the advices you provided to cnc shop guys. Pretty sure we can make it without all the extra manual work

754 · « **Reply #127 on:** November 22, 2015, 12:24:18 PM »

The top tree is not the major concern.. The lower takes the punishment.
On a casting the part line should be very thin, otherwise waste of material and extra cleanup cost. A mm would be a lot.
Forgings go thru trimming dies.... Then it may get tumbled or ball burnished.. The part line then may appear untouched..
Another issue is part lines on castings are easiest to do if they are single plane...ie, a straight line. To change that part line to a curve or multi step on a forging, is of little consequence , but major deal when casting..
Here is a pic of a Bultaco tree.. Note how thick the part line is... On many trees you can see evidence of triming dies on the part line.

MessnerMoto · « **Reply #128 on:** November 22, 2015, 12:46:07 PM »

The point is that I designed my triples according to gsxr triples. They are cast.

754 · « **Reply #129 on:** November 22, 2015, 12:56:38 PM »

Hey,no problem in strength in what you are building, and its very nice work..

MessnerMoto · « **Reply #130 on:** November 22, 2015, 02:30:53 PM »

Quote from: 754 on November 22, 2015, 12:56:38 PM

Hey,no problem in strength in what you are building, and its very nice work..

It ok

I am always open for discussion. I am pretty sure we will use some of your advices for machining when when I remake this part

MessnerMoto · « **Reply #131 on:** November 24, 2015, 09:17:11 AM »

In the end this is how the ceiling was made. Not my idea

And we started immediately something new. Probably the last complex part I will make for this build.

MessnerMoto · « **Reply #132 on:** November 27, 2015, 12:12:55 PM »

I am getting close to finish all CNC stuff... Controls are still not polished... Finishing touches left for the weekend

SOHC4 Cafe Racer Fan · « **Reply #133 on:** November 27, 2015, 01:16:10 PM »

Amazing!

MessnerMoto · « **Reply #134 on:** November 27, 2015, 05:34:41 PM »

Thanks Don

Retro Rocket · « **Reply #135 on:** November 27, 2015, 05:50:16 PM »

Quote from: CB750 Cafe Racer Fan on November 27, 2015, 01:16:10 PM

Amazing!

+1, I love to see someone fabricating simply because they can...

MessnerMoto · « **Reply #136 on:** November 28, 2015, 02:12:13 PM »

Quote from: Retro Rocket on November 27, 2015, 05:50:16 PM

Quote from: CB750 Cafe Racer Fan on November 27, 2015, 01:16:10 PM
Amazing!

+1, I love to see someone fabricating simply because they can...

Speaking of fabrication... Things are speeding up.

With the help of my good friend munizabap(old soho uk forum member) and a rally excellent fabricator who has his own custom shop we started making some progress.
Majority of work went in to making one giant banding wheel. It has diameter of 360mm for 35mm tubing. If you want custom stuff you need to make your own tooling

So we did all the bends on one tube without banding. Thats some really nice skills by my friend. Pneumatic press....

brandEn · « **Reply #137 on:** November 28, 2015, 06:31:16 PM »

wow.....

754 · « **Reply #138 on:** November 28, 2015, 07:36:23 PM »

Very nice, how thick is the wall of the tubing..?

MessnerMoto · « **Reply #139 on:** November 29, 2015, 02:17:08 AM »

Quote from: brandEn on November 28, 2015, 06:31:16 PM

wow.....

Thanks

Quote from: 754 on November 28, 2015, 07:36:23 PM

Very nice, how thick is the wall of the tubing..?

The wall is 2mm thick. So there is no need for fancy bending tools because tube is not deforming. Diameter of banding and diameter(35mm) of tube are big enough so there is no need for mandrel tool also. Probably this setup for bending is good enough for 1.5mm wall. Everything below 1.5mm thickness would require mandrel tool insert in tube during bending... I mean tube is for sure deformed during bending but currently it is not noticeable

SOHC4 Cafe Racer Fan · « **Reply #140 on:** November 29, 2015, 09:20:48 AM »

The bracing looks excellent.

754 · « **Reply #141 on:** November 29, 2015, 11:08:31 AM »

Where is your front master cylinder. Two bikes that had remotes were.. 80,s Beemers, and Z1R,s..
..I like the clean matched look... Better than hoses and mini reservoirs hanging in the breeze..

..Sometimes ..less is more.....

MessnerMoto · « **Reply #142 on:** November 30, 2015, 12:43:10 AM »

Quote from: 754 on November 29, 2015, 11:08:31 AM

Where is your front master cylinder. Two bikes that had remotes were.. 80,s Beemers, and Z1R,s..
..I like the clean matched look... Better than hoses and mini reservoirs hanging in the breeze..

..Sometimes ..less is more.....

Front cylinder is missing from front right control because of 2 reasons. First because I it is currently beyond my design and production capabilities. I can make it but I need to draw a line what I will do for this build. If I don't do it I will end up designing and making every part of bike

.

Second thing is the look. Yep it looks way better without front master. The inspiration came form CB750 cafe racer by Crowe/Tarantulas cb750 bike controls. I will reuse somehow front master from gsxr. Probably I will just modify brake leaver of gsxr cylinder so it is pulled by cable. Of corse it is all hidden under the tank.

The drawback is I am introducing one more system that can fail

MessnerMoto · « **Reply #143 on:** December 08, 2015, 05:31:21 AM »

I finished modeling assembly for light. All the parts will be 3d printed. Of corse skin will be hand formed aluminum. I am still waiting for led projector to arrive. I need to measure connecting points of led projector and then I will make support for it....

greenjeans · « **Reply #144 on:** December 08, 2015, 06:56:44 AM »

I quit. Beautiful work. I want to be a machinist when I grow up.

SOHC4 Cafe Racer Fan · « **Reply #145 on:** December 08, 2015, 08:41:46 AM »

This build continues to showcase your CAD skills. Very nice!!

MessnerMoto · « **Reply #146 on:** December 08, 2015, 12:53:09 PM »

Quote from: greenjeans on December 08, 2015, 06:56:44 AM

I quit. Beautiful work. I want to be a machinist when I grow up.

Start learning now

. I am not really machinist... I am just able to learn new things

Quote from: CB750 Cafe Racer Fan on December 08, 2015, 08:41:46 AM

This build continues to showcase your CAD skills. Very nice!!

Thanks! I think I finished all the design for the bike. I will concentrate on fabrication and engine from now

MessnerMoto · « **Reply #147 on:** December 09, 2015, 07:28:08 AM »

I've got my seat today. I first 3d printed the seat and than I sent it to a guy who made a mold from 3d printed seat. Printed version is in the middle. 3d print is dirty because of mold making material. Foam is some kind of polyurethane. I have several examples of seat to chose foam density for my butt

I've cut metal insert from ribbed aluminum sheet just for test fit... I will not use ribbed al... I don't like that look.

SOHC4 Cafe Racer Fan · « **Reply #148 on:** December 09, 2015, 08:14:12 AM »

Amazing as always. Now if only you could 3D print leather upholstery!!

ivanhoew · « **Reply #149 on:** December 09, 2015, 10:06:06 AM »

holy bloody mackerel!!!

what an amazing build ,thank you for the detail ,and taking the time to post ,as well as actually doing the project .

robert.

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Author Topic: MessnerMoto - CB750 f2 - Some Parts are now available from build!! (Read 85985 times)