Author Topic: MessnerMoto - CB750 f2 - Some Parts are now available from build!! (Read 84524 times)

754 · « **Reply #100 on:** September 13, 2015, 04:18:55 PM »

Hard part is getting the tubes bent as well as where they end up.

MessnerMoto · « **Reply #101 on:** September 14, 2015, 05:54:46 AM »

Quote from: Gman on September 13, 2015, 03:02:25 PM

MM,
Beautiful work all around - I love watching your expertise and attention to detail as your vision comes to fruition.

If you don't mind sharing your ideas (for instance the swingarm modded for a mono), you could rent out your wooden forms. They disassemble and pack flat, so you could ship it easily. Someone could pay you $?? to use it, then return it when done. You wouldn't have to do any extra fabbing for all the guys drooling over your parts. Just a thought...

I don't have a 750, otherwise I would be begging for you to make 2 of everything.

Peace,
G

I can give out drawings for swingarm wood form. It is cheeper then shipping including laser cutting.

Quote from: 754 on September 13, 2015, 04:18:55 PM

Hard part is getting the tunes bent as well as where they end up.

If someone needs it PM me.

I have all the bents of tubes in 2D. I will try to find CNC bending... But it can be done with tries and error without that. I have 6m od tubing

Tube is 35mm diameter wall 2mm, probably I could have gone with 1.5mm wall.... Rounded ends will be filed on lathe...

MessnerMoto · « **Reply #102 on:** September 17, 2015, 12:54:18 PM »

Today I made endings for tubes on swingarm. I made duplicates just in case. Picture quality is bad because I forgot my phone....

SOHC4 Cafe Racer Fan · « **Reply #103 on:** September 17, 2015, 02:34:18 PM »

Are you using regular mild steel for the axle plate/brackets?

MessnerMoto · « **Reply #104 on:** September 17, 2015, 02:56:02 PM »

It should be regular steel because swingarm is mild steel also... But because I didn't want to wait for material to come I used 4732(42CrMo4). It will be welded to mild steel tubing... no advantage there in using 4732. If I wanted to make swingarm from scratch I would use 4130 tubing with addition of 4321 for brackets...

Trad · « **Reply #105 on:** September 17, 2015, 07:56:44 PM »

MessnerMoto, can I ask what your profession is? You are doing some amazing stuff in here.

MessnerMoto · « **Reply #106 on:** September 18, 2015, 01:15:27 AM »

Quote from: Trad on September 17, 2015, 07:56:44 PM

MessnerMoto, can I ask what your profession is? You are doing some amazing stuff in here.

Thanks! First of all my name is Mirko;) I am an IT guy. To be precise currently working as a mobile developer. But this is my dream

MessnerMoto · « **Reply #107 on:** October 03, 2015, 07:39:53 AM »

I made progress on several fronts...

I made spacers for back wheel. Wheel I am using is made for 25mm axle... I had to make spacers for 20mm axle...
Also I changed wheel bearings from 6205 to 6304(25mm ID to 20mm ID).

Wheel is perfectly centered in swingarm. Tolerance +/- 0.1mm

Because I wanted to save time I bought brake that goes with this wheel(KTM adv 1190 R)

But I didn't think about how it will look. That brake holder will never go with my bike. It doesn't look good.

So the solution was to design and make holder...

This one is better looking

... Also I had my forks disassembled, straightened, assembled(note to everybody: there is a big chance that you are buying forks from crashed bike. Always check if forks are bent, and usually they are

.

Fender holders are cut. There is not a trace of them anymore

RAFster122s · « **Reply #108 on:** October 03, 2015, 12:45:43 PM »

What are you going to do about the chain sprocket offset from the motor to the rear wheel?

MessnerMoto · « **Reply #109 on:** October 03, 2015, 12:56:05 PM »

Quote from: RAF122S on October 03, 2015, 12:45:43 PM

What are you going to do about the chain sprocket offset from the motor to the rear wheel?

Look at Page 3. I made custom sprockets

SOHC4 Cafe Racer Fan · « **Reply #110 on:** October 03, 2015, 08:31:16 PM »

Mirko,

That brake carrier is elegant. I like how you milled off the front fender mounts, too.

MessnerMoto · « **Reply #111 on:** October 06, 2015, 11:38:38 AM »

Quote from: CB750 Cafe Racer Fan on October 03, 2015, 08:31:16 PM

Mirko,

That brake carrier is elegant. I like how you milled off the front fender mounts, too.

Thanks Don

Small update....

I received my disks today. They are Brembo ORO series front for GSXR. For rear also Brembo for KTM. They match perfectly... Like the rounded look

Also I did make my set of stainless bolt for from disks. To eliminate clearance issues with my 3d fender I had to make bolts with thiner head. Originally it is bolt head is 3mm my bolt have 2mm thick head. Bolts have tighter tolerances then originals. Also they look better in stainless(304)

I made 100 bolts just in case

754 · « **Reply #112 on:** October 06, 2015, 11:46:49 AM »

Did you cut the hex in the bolthead with a wobble broach?

MessnerMoto · « **Reply #113 on:** October 06, 2015, 11:53:53 AM »

I think yes. It was done by the shop. If you are talking about this

SOHC4 Cafe Racer Fan · « **Reply #114 on:** October 06, 2015, 11:57:18 AM »

Quote from: MessnerMoto on October 06, 2015, 11:38:38 AM

Also I did make my set of stainless bolt for from disks. To eliminate clearance issues with my 3d fender I had to make bolts with thiner head. Originally it is bolt head is 3mm my bolt have 2mm thick head. Bolts have tighter tolerances then originals. Also they look better in stainless(304)

I made 100 bolts just in case

I like those, too!

MessnerMoto · « **Reply #115 on:** October 06, 2015, 12:01:19 PM »

Quote from: CB750 Cafe Racer Fan on October 06, 2015, 11:57:18 AM

Quote from: MessnerMoto on October 06, 2015, 11:38:38 AM
Also I did make my set of stainless bolt for from disks. To eliminate clearance issues with my 3d fender I had to make bolts with thiner head. Originally it is bolt head is 3mm my bolt have 2mm thick head. Bolts have tighter tolerances then originals. Also they look better in stainless(304)

I made 100 bolts just in case

I like those, too!

Did I say you will not get them?

...

MessnerMoto · « **Reply #116 on:** October 16, 2015, 06:53:31 AM »

I am currently in Berlin. Buy chance I stumbled on custom bikes displayed at Gestalten bookstore. Bikes from Wrenchmonkeys, Autofabrica... are on display... It is a promotion of this book http://shop.gestalten.com/the-ride.html
You can't imagine how happy I was to see some bikes from my favorite builders

MessnerMoto · « **Reply #117 on:** November 17, 2015, 02:06:26 AM »

There is a lot things going on with the build. I just don't have time to upload... Overvalued with work this days.
I will just give you small update because I think this is interesting.

This is how I enlarged swingarm pivot holes on the frame.... After a discussion with Hondaman in PM one month ago I realized how critical are tolerances around pivot bolt for good and safe handling. Originally pivot bolt is 13.8mm and holes are 14.15mm. I think Honda made this loose fit because they could not produce two pivot holes to be exactly on same axis... The problem is that pivot bolt will move under heavy load. Adding to a lateral movement of back wheel. And I am using 16mm pivot from later DOHCs(15.95mm exactly)

My goal was to reduce that gap from 0.35mm to 0.1mm. Guys from CNC shop made all this happen.

Holes are of the axis so we had to use one hole as a guide. We inserted one tube of 14mm in first hole as a guide. Grabbed that tube with
special CNC tool for 14mm diameters. Then clock was used to fine adjust parallelism of the hole(fine taping the frame here and there). Then we fully tightened the frame for working table. Similar process was done for second hole but with longer tube spanning from first hole to almost entering second hole. Missing pictures for that second part.

So at the end holes are 16.03-16.07mm(Larger at the entrance of boring)... And pivot bolt is going in first in to a first hole easly with slight taping to for second hole....

This can be done better using frame neck as a parallel guide but it is beyond needed. Also it is not a bad thing to do it with bolted engine.

MessnerMoto · « **Reply #118 on:** November 20, 2015, 04:24:49 PM »

I am finishing with CNC parts. Several more and I am finished. Handlebars are 22mm with 8 degree angle. Designed by me... made by my good friends from CNC shop. There will be no clamp bolts

You will see in several days how the handlebars are clamped to forks

FunJimmy · « **Reply #119 on:** November 20, 2015, 05:22:47 PM »

Internal wedge inside the bar.
Not new.

MessnerMoto · « **Reply #120 on:** November 21, 2015, 05:16:33 AM »

Yep something like that

brandEn · « **Reply #121 on:** November 21, 2015, 09:09:23 AM »

WOW! Those are cool.

754 · « **Reply #122 on:** November 21, 2015, 09:13:08 AM »

I would have just bored them first then mounted on a plug with a washer and bolt.
Way less machining and material.. .they look good.

MessnerMoto · « **Reply #123 on:** November 21, 2015, 11:29:20 AM »

Quote from: 754 on November 21, 2015, 09:13:08 AM

I would have just bored them first then mounted on a plug with a washer and bolt.
Way less machining and material.. .they look good.

We tried that but part was moving during machining. This is a second try

. Probably there is even better way to do it...

RAFster122s · « **Reply #124 on:** November 21, 2015, 04:02:20 PM »

Not sure which portion was moving and difficult to machine. I would have milled it and not cut the round portion leaving the outside edge half cut with maybe 30-45 degrees or the cut not cut for the last 1/3 of the radiused end. Program the cnc to cut the sides of that section so you have parallel sides respective to the end for the boring. Then the part free with edges squared to be able to clamp so your boring can be aligned to the end. You will of course have to check with a laser or plumb line that your drill or milling bit is going to bore into the part straight. If it is off by much you may be able to see that with the bar ends attached.

Ideally you perform all the machining without removing the part of all the angles align. (Within the bounds of the programming...)
It is interesting, I guess you have a strong desire to have something no one else has or you enjoy seeing designs come to life.

What is your testing method going to be for critical parts since you are reinventing/reengineering many parts on the bike?

David

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Author Topic: MessnerMoto - CB750 f2 - Some Parts are now available from build!! (Read 84524 times)