1970 Vespa 50s electrification project

General Discussion about large electric scooters and motorcycles and other things with no pedals.
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EddySPalm   10 W

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Re: 1970 Vespa 50s electrification project

Post by EddySPalm » Sep 19 2018 12:49pm

TilmanBaumann wrote:
Sep 19 2018 10:37am
Hi,

how did you determine the material and thickness requirement for your swing arm? What steel and thickness did you use?
I'm building one right now, and I think I'm building a tank. :oops:
I honest to god started with a 10mm thick 80mm wide flat section of steel.

photo_2018-09-19_17-43-37.jpg

If I don't fsck-up the welding I can use square tube for the arms for sure.
Hey,

First of all, you need to design the swingarm so that the forces from it's surroundings (mostly reaction forces from the shock and brake) yield as little bending and twisting as possible. Compression, tension and shear (to a certain degree) is favourable.

Square and round (or simply hollow) sections are brilliant because they can handle forces in most directions.

So if you make sure your forces are not acting with an offset to whatever your chosen section is, and if you keep your lengths of flat stock to a minimum (very prone to twisting, and even buckling) you're probably onto something!

Hope that gave some kind of general, boring answer 😅

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EddySPalm   10 W

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Re: 1970 Vespa 50s electrification project

Post by EddySPalm » Sep 19 2018 12:53pm

Btw my sections are from mild steel, 355MPa yield, all 2mm thick.

The front is 40mm round tubing
The middle pieces are 40mm square, and
The rear pieces are 40x20mm rectangular.

TilmanBaumann   100 W

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Re: 1970 Vespa 50s electrification project

Post by TilmanBaumann » Sep 19 2018 4:44pm

I think I will use some 40x20 section as well. (Stainless I think)
Gives me some girth and is way lighter. I can always tack stuff on it it wobbles.

Thanks for your help.

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EddySPalm   10 W

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Re: 1970 Vespa 50s electrification project

Post by EddySPalm » Sep 20 2018 1:57am

I reached a milestone today, and sent the swingarm in for final welding!
I used last night to drill and file out a slot for the spherical bearing cup to be welded in, and I got it both further back and up than I thought I would, so super happy with that. The welder at my local machine shop said he wouldn't have time for it anytime soon, but I'm alright with that.
Some pictures from yesterday evening:
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EddySPalm   10 W

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Re: 1970 Vespa 50s electrification project

Post by EddySPalm » Sep 20 2018 2:01am

Ohh and a little delayed bonus shot from the FLUKE IR thermocamera, showing maximum temp on the BMS during our 100A run. That's 56 degrees C.
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EddySPalm   10 W

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Re: 1970 Vespa 50s electrification project

Post by EddySPalm » Mar 07 2019 3:39am

Well things have been moving along, but at the pace of a turtle.
I procrastinated the making of a battery box way too long, and when I finally had one made which I was to some extent pleased with, it didn't fit the scooter :lol: :confused:

So what I have decided to do now is: I am just wrapping the batteries in a home sewn "case", and I am implementing all the support that the batteries need in forms of cell foam cushioning inside the scooter. This saves me a ton of space!

I am in the midst of trial fitting the battery, BMS and everything else into the scooter, to get it to the point where I can safely test drive it. This will give me a good indication of how and where I should locate things when time comes to do things permanently. I am having way too many questions nowadays to do final decisions at this stage.

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EddySPalm   10 W

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Re: 1970 Vespa 50s electrification project

Post by EddySPalm » Mar 07 2019 7:58am

A shot of the battery pack in a state ready for trial fitting.
2019-03-04 23.08.20.jpg
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SlowCo   100 kW

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Re: 1970 Vespa 50s electrification project

Post by SlowCo » Mar 07 2019 8:03am

Wow, you're building a sexy electric Vespa with kinky red leather battery bag.... 8) :lol:

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