Custom frame for the Cyclone Coaxial motor

[Chambers]

Yeah, I have a bit of a plan to shrink it in all directions -

[Chambers]

Got a bit more fab work done over the last couple of evenings, I was struggling to find 44mm id tubing for the head tube then I had a brain wave.

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This old pit-bike frame looked to be close in dimensions

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Perfect!

Then I took to adding some strength to the motor mount plates

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This is 20 x 3mm flat bar - I tacked it at the start then slowly bent around tacking as I went then welded them up

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I had planned on TIG welding everything and leaving the welds (no sanding) but I got an air leak somewhere in my TIG torch/gas line which caused a bit of aggravation and a mess - I didn't take any pics of that bit - Was too busy being annoyed

Anyway long story short I went back to the trusty MIG (technically MAG but we don't need to have that discussion here) Got a few bits welded and mostly blended

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Someone asked on FB about the weight

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Excuse the butterfly scales that's 5.45 kg so far (That's about 12 pounds for the metrically challenged ) Hopefully should be able to keep it under 8kg including the swing-arm - A FUTR beta frame weighs 6.9kg for reference

[Chambers]

Bit more work done - Welding and strengthening the head tube area

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Weird camera angle on the last shot makes the frame look bent - I assure you it's not The pics don't really give a good impression of what it looks like TBH I'll post a vid when I'm further through.

[Pedrodemio]

I've been silently following this build for a while

If there is a dream bike for me, is someday building a similar frame as that, can't wait to see the results

Well done Chambers

[Chambers]

I've been silently following this build for a while

If there is a dream bike for me, is someday building a similar frame as that, can't wait to see the results

Well done Chambers

Thanks

[Chambers]

So I haven't completely disappeared - Apparently buying kids Christmas presents is more important than e-bike building .

Anyway with limited funds available and still waiting on parts I built a place holder swing-arm with some scrap I had lying around.

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Room left over for some additional strengthening of the pivot point..

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I will probably re-build this once I have the shock and hub in my hands (both on a VERY slow boat). Triangulation will be added between the pivot point and the hub and the rear most section will be replaced with some 6mm plate to hold the rear wheel.

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[Tommm]

Room left over for some additional strengthening of the pivot point..20210102_140123.jpg20210102_132914.jpg

If you are using an axle hole interface for the pivot it is better to weld some bushing holder instead of frame to axle action. Otherwise even if greased the pivot hole will be a half inch up and ovalised if you check it next year.

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[Chambers]

Room left over for some additional strengthening of the pivot point..20210102_140123.jpg20210102_132914.jpg

If you are using an axle hole interface for the pivot it is better to weld some bushing holder instead of frame to axle action. Otherwise even if greased the pivot hole will be a half inch up and ovalised if you check it next year.

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haha wow thats some good work!

[Tommm]

Room left over for some additional strengthening of the pivot point..20210102_140123.jpg20210102_132914.jpg

If you are using an axle hole interface for the pivot it is better to weld some bushing holder instead of frame to axle action. Otherwise even if greased the pivot hole will be a half inch up and ovalised if you check it next year.

Screenshot_20210103_051947.jpg

haha wow thats some good work!

What makes it better is the hole ovalised upwards on one side and downward on the other side. So there might have been some misalignment that is getting fixed (or getting worse) this way. When it gets long enough I plan on rounding the hole and making it take a press fit copper bushing. Maybe something harder.

[Chambers]

Bit of linkage testing in real life.

[BeachRider2016]

Man, maybe someone can help you 3d print that part then cast in aluminum. It’ll be solid ! Great build btw, I’m definitely following.

[Chambers]

Man, maybe someone can help you 3d print that part then cast in aluminum. It’ll be solid ! Great build btw, I’m definitely following.

Thanks! The plan was to make the first iteration out of steel for testing purposes then when I find the time to build my CNC router it'll be made from aluminium.
Casting isn't a bad idea though! thanks