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Author Topic: Because I don't have enough to do, building new frame for my Ducati.  (Read 2760 times)

Offline jag767

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Almost a year ago when I started to build my ducati 160, I scrounged up parts around the shop to make a bike to go with the motor. I never planned on this being it's final form, but since people seemed to like it so much I haven't changed it. Well, that's about to change.

A couple of days ago I pulled the engine for some more aggressive top end work, especially since I have resources available to me I didn't have previously to really get it right. While it's out, I started playing with the build a whole new frame idea again. My goal was to come up with a simple design that I could build without a frame jig, using only a tube roller and hand cutting all my notches. After a little playing around, I've done just that. My plan is to make everything other than the swing arm a single tube, so I can draw it out with the correct angle/radius, and just lay the parts on the drawing to confirm its correct. I've seen some builders to it this way with success.

Best I can tell with 2" .125 wall tubing, using the frame as a stressed member, I'll be good to go. I think the end result will be a bit lighter, but more importantly it will look awesome. I just ordered the tubing, plan is to screw around this weekend. In the mean time I'm open to suggestions, especially on the rear monoshock, front end, and wheels. I'm really trying to keep this lightweight, and I'm digging the idea of a supermotoish style.

Here's a very crude sketch of what my initial idea is.

Offline doc_rot

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  • Oh the usual... I bowl, I drive around...
Looks like a cool project. How will you ensure the headstock is true to the swingarm pivot without a jig?

Offline jag767

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Looks like a cool project. How will you ensure the headstock is true to the swingarm pivot without a jig?

It's all gonna be flat since it's a single tube and I'll tack it right to the table. That's the main reason I'm making everything from 2 inch tube.

Offline jag767

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And already I screwed up, er kind of. Ordered 2 inch material for the neck so it would be uniform with the frame, and the neck bearings are a smidge larger than the steel. Luckily I have 2.5in 7075 billet aluminum laying around, so I will undercut the neck to account for the length of the aluminum cups I will add. It'll actually look pretty cool in the end, I'll turn a nice radius onto the outside of the cups, much easier than having to do it to steel anyway. I'll machine it extremely tight and press them in, should work well from what I gather. I need the finished outside length to be 6 7/8".

Offline Alex jb

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Evolutionary design, itís what garage builds are all about!

A colleague left the company we worked for designing off highway machines and went to work (at the same site) for Royal Enfield, heís mad keen on bikes and I really hope working in the volume industry doesnít beat the love out of him


Sent from my iPhone using Tapatalk

Offline jag767

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Yup, this is evolution all right. Spent a little time on the lathe, but got cut short. Once I get a couple more hours in I'll get some pretty photos on here. At the risk of being ridiculous, I think i'm going to use the overkill spare 998 front end I have, and make the needed parts to run it with a front drum. Ironically, being much larger, it's not much heavier than the little 31mm I was using. I'm hoping  it doesn't look silly, definitely going to give the bike an English bulldog-like appearance.

Offline jag767

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Got some lathe time in last night, and figured out exactly how to make the parts of the neck with a little trial and error. Now that the error is out of the way, I will finish up the parts tonight. Should look pretty awesome for a neck.

Since i promised photos, heres the ducati front end im using.

Offline DesmoDog

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All this for a 160 engine? I had a 160...

Boy, you ain't quite right.  ;-)


Offline jag767

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All this for a 160 engine? I had a 160...

Boy, you ain't quite right.  ;-)

Lol I really like the little guy. That and I want to build a frame for the sohc cb750 motor I picked up, and this seems like a fair stepping stone.

Offline jag767

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Well this just took a violent left turn. While I do want a different frame for my 160, through a series of semi logical events, I'm going to use my m750 motor for this instead.  The short of it is I wound up with different wheels, and at this point all I need is a seat and tank to have an entire second bike. I hate my 750 other than the motor, and have intended to make a frame for that too, and I figured out an awesome design which will still be doable without a jig. It's hard to follow my chicken scratch drawing, but the downtube, backbone, seat post, and radius swinging into it are still a single tube. The 2 radius (what's plural for radius?) Going down between the backbone and downtube will be on each side of the motor for motor mounts. I need to make sure the strength is there, but I think it'll work.  I finished making the neck (pictures tomorrow) so next my buddy will take measurements for this and make a model so we can get exact figures to build the frame.