CNC pitbike with qs273 conversion

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Samd
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CNC pitbike with qs273 conversion

Post by Samd » Sep 09, 2016 4:14 pm

Hey guys I got this frame cheap for $50Aud and waterjetted up the side plates for a battery cradle.

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Also got a bunch of cheap 13" scooter motors. Quanshun axles and magnets aren't exactly best in class but it will do. Mxus45mm up front for comparison.

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Pleased to crack open the motor and find a 273mm stator in v2 aluminium with 45mm wide guts. Image


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"Knowledge is knowing that a tomato is a fruit. Wisdom is knowing that a 165mm rear shock can't deliver 220mm of rear swingarm travel." - Oprah Winfrey.

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Re: CNC pitbike with qs273 conversion

Post by Samd » Sep 09, 2016 4:17 pm

Did some CAD work. Image


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"Knowledge is knowing that a tomato is a fruit. Wisdom is knowing that a 165mm rear shock can't deliver 220mm of rear swingarm travel." - Oprah Winfrey.

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Re: CNC pitbike with qs273 conversion

Post by Samd » Sep 09, 2016 4:20 pm

Forks needed a new steerer turned up. Image

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"Knowledge is knowing that a tomato is a fruit. Wisdom is knowing that a 165mm rear shock can't deliver 220mm of rear swingarm travel." - Oprah Winfrey.

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Re: CNC pitbike with qs273 conversion

Post by Samd » Sep 09, 2016 4:21 pm

Torque plates waterjetted for the steel swingarm. Image


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"Knowledge is knowing that a tomato is a fruit. Wisdom is knowing that a 165mm rear shock can't deliver 220mm of rear swingarm travel." - Oprah Winfrey.

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CNC pitbike with qs273 conversion

Post by Samd » Sep 09, 2016 4:22 pm

Front wheel sorted. Scooter tyre just clears.

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"Knowledge is knowing that a tomato is a fruit. Wisdom is knowing that a 165mm rear shock can't deliver 220mm of rear swingarm travel." - Oprah Winfrey.

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Re: CNC pitbike with qs273 conversion

Post by Samd » Sep 09, 2016 4:25 pm

Clamp ons need about 1.0mm reaming to fit.
Image

I've got a new FOC controller coming. 72v 200 batt amps. Specs seem unbeatable as does the price.


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Re: CNC pitbike with qs273 conversion

Post by E-Chopper » Sep 21, 2016 2:09 am

already looks good!!! although it is not finished .
am interesiert how the finished pitbike looks .

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Re: CNC pitbike with qs273 conversion

Post by Quokka » Oct 04, 2016 6:47 am

Holly crap :shock:
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Re: CNC pitbike with qs273 conversion

Post by E-Chopper » Oct 19, 2016 4:41 am

are there any Progress on this bike since last time ?

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Re: CNC pitbike with qs273 conversion

Post by spinningmagnets » Oct 19, 2016 8:13 am

What a great example of how water-jetting or laser-cutting can allow a builder to get fantastic results, even if you only have a garage to work in. Well done!

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Re: CNC pitbike with qs273 conversion

Post by liveforphysics » Oct 19, 2016 1:43 pm

That should be a beastly machine! Nice work!
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Re: CNC pitbike with qs273 conversion

Post by John in CR » Oct 19, 2016 10:19 pm

You'll want to extend the swingarm to be able to take advantage of the torque potential...and a big-ass controller too, since several hundred amps battery side with less than a 1.5:1 phase/battery current limit ratio is what the motor deserves. I have a 50mm wide with a Kv of about 18rpm/v and had no issues whatsoever pumping 425A battery side 510A phase limits. Well I did have one issue, which was keeping the front down with a much longer wheelbase and weight forward bias. Like LFP said, you'll definitely have a handful with the right controller.

BTW, you said they were cheap. Can you PM me the source?

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Re: CNC pitbike with qs273 conversion

Post by Samd » Oct 21, 2016 3:55 pm

Heya John, thanks for the advice. Yeah no surprises with the wheelbase issues. I'm a mech eng and am mindful of it.

The qs motors were stripped from a local scooter company's stock when they closed up. I have one that has well worn rims but seems functional if anyone wants. Pm me if so.

Controller wise I have something really special in mind. But too early to spill the beans yet.


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CNC pitbike with qs273 conversion

Post by Samd » Dec 25, 2016 12:52 am

Got some new clampons. Too hard to ream the old ones

Image


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"Knowledge is knowing that a tomato is a fruit. Wisdom is knowing that a 165mm rear shock can't deliver 220mm of rear swingarm travel." - Oprah Winfrey.

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Samd
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CNC pitbike with qs273 conversion

Post by Samd » Dec 25, 2016 12:57 am

Mobipus 72200 and 72600 controller testing looking good. Just bought a 7" tablet for the dash.


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Here's a video overview of what these oem level controllers can do.

https://youtu.be/_zL8zXFmEbI

I like that foc can be invoked at a given speed to increase top speed.


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"Knowledge is knowing that a tomato is a fruit. Wisdom is knowing that a 165mm rear shock can't deliver 220mm of rear swingarm travel." - Oprah Winfrey.

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Re: CNC pitbike with qs273 conversion

Post by Microbatman » Dec 30, 2016 1:08 pm

Great Work!! Another step forward in the ES forum.
Thank you for sharing.

That small diameter tire on a hub will work well.
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