qs 1000w builds

devo1223 · Apr 7, 2019

Ok I think there are maybe three us now so let's start our own thread. QS 1000w middrive builds. I just bought mine, waiting for it to arrive.

It's pretty wide, I don't think it will fit between my crankarms so I plan on placing the motor away from the pedals a bit.

Also, last time a checked with them they will only supply the motor with the pulley wheel, not a 219 sprocket so I need to make an adaptor.

eee291 · Apr 7, 2019

Hey, that's my hand! :lol:

devo1223 · Apr 7, 2019

I admire your work. I'm going to copy it unless you have an extra one laying around you will send me...

larsb · Apr 7, 2019

It's strange, they now have the sprocket as a standard option for the 3000w. Thought they had developed an interface that they could apply to all the motors.

maitilupas · Apr 8, 2019

yes costs about more 15 dolars for a 428

Skaiwerd · Apr 8, 2019

Cool

Things are moving fast with this motor. I see it attached to a swingarm soon. I’ll keep an eye on the adapter progress in case I want to ditch the belt for my 1st stage of reduction. Need a bigger rear chainring cyclone has a 90 tooth doesn’t give enough reduction for a single stage. So easy to ditch one idea for another.

Grantmac · Apr 8, 2019

7~8:1 should be a fine reduction ratio for this motor on 26" wheels and a 40mph top speed. That is possible with a single stage of 219.

devo1223 · Apr 8, 2019

maitilupas said:
yes costs about more 15 dolars for a 428

Who are you ordering from? I can't even get them to install a temp sensor on aliexpress

larsb · Apr 8, 2019

Www.cnqsmotor.com

maitilupas · Apr 8, 2019

yes qs company in aliexpress they will provide you the sprocket

https://www.aliexpress.com/store/4393030

maitilupas · Apr 8, 2019

devo1223 · Apr 8, 2019

yeah but you ordered the 3000w. The 1000w isn't even offered on your link. It doesn't seem they are offering the same support with the 1000w. I messaged them again to see if they would do 428.... :roll:

eee291 · Apr 8, 2019

Whoa, I didn't know they made a sprocket that was made after the stock axle...nice!
I'm gonna have to get this in case mine breaks.

devo1223 said:
yeah but you ordered the 3000w. The 1000w isn't even offered on your link. It doesn't seem they are offering the same support with the 1000w. I messaged them again to see if they would do 428....

It depends, if the axle has the same measurements as the 3000 version you can just buy the sprocket and have a mechanic pull off the existing pulley.

Skaiwerd · Apr 8, 2019

The 1000w does not have a tapered shaft.

eee291 · Apr 8, 2019

Having a straight shaft actually makes it easier then.

All you would need is a machinist.
https://www.ebay.co.uk/itm/13t-428-Pitch-Nas-Kupplung-Motor-Ritzel-Go-Kart-Gokartfahren-Rennen-Racing/332491279366?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20180816085401%26meid%3D0fbc593baaac48028453ba18b8c20b19%26pid%3D100970%26rk%3D1%26rkt%3D6%26sd%3D332491279366%26itm%3D332491279366&_trksid=p2481888.c100970.m5481&_trkparms=pageci%3A0e790d0e-5a92-11e9-a7f7-74dbd180c243%7Cparentrq%3A00d195fe16a0ac3df2c17054fffec84c%7Ciid%3A1

crossbreak · Apr 9, 2019

Skaiwerd said:
[...]Need a bigger rear chainring cyclone has a 90 tooth doesn’t give enough reduction for a single stage. So easy to ditch one idea for another.

Why not use a custom lazer cut one? I mean there is plenty of space, a 400mm or 16 inch dia #219 one with ~160t to 12t would be a 13:1 reduction. I dont know how fast this thing wants to spin, but i think that is in the range of the OEM swing arm with belt reduction, that was i think 5 to one but with a quite small wheel

At least this sounds much simpler + lightweight to me than an additional reduction stage if it is not really necessary

crossbreak · Apr 9, 2019

Skaiwerd said:
The 1000w does not have a tapered shaft.

can you pls provide the dimensions so i can make a CAD model of the #219 that can be lazercut?

Skaiwerd · Apr 9, 2019

The motor shaft is 17mm in diameter with a 5mm key down the side. The shaft is about 18mm in length.

Unconfirmed. Please test print with a 3d printer before sending your file out for cutting. Don’t know if nominal or actual etc. I’m not responsible basically. Please confirm on the motor you receive.

Grantmac · Apr 9, 2019

They quoted me as 3000rpm@72v and 3500rpm with FW. That seems like a very small FW gain for an IPM (which they confirmed this is).
But that calculates out to needing perhaps 7-8:1 for a 40mph ebike on 26" wheels.

devo1223 · Apr 9, 2019

No luck with the sprocket from QS. My motor is coming with the pulley and maybe a sprocket later that will probably be tapered and not fit. A CAD model for the 219 sprocket would be awesome!

The struggle is real, fellas

devo1223 · Apr 9, 2019

I guess with a little filing this would work. I think 15mm is standard for 219, I wonder why QS uses 17mm

Skaiwerd · Apr 9, 2019

If you can take a picture of the one you want in the correct tooth count, but incorrect center mount I may be able to help with a cad file. Please make sure there is a tape measure or ruler in the picture, I prefer metric. A lot to ask but this is how I work. I’ll double check the diameter size when I get home.

Old photo

Skaiwerd · Apr 15, 2019

From another es post.
http://www.gizmology.net/sprockets.htm

Basically instructions for designing your own sprocket.

What’s desired? Chain type and tooth count for the sprocket?

devo1223 · Apr 15, 2019

#219 with 12 teeth would be great. Here's my progress so far. My motor should be here next week. My wooden mockup in its place for now.

Skaiwerd · Apr 26, 2019

My day job has me faced with an additional 2 hours added to my commute daily. I’m sure there’s a teary eye somewhere for me, ha ha. So... back burner for the 219 chain sprocket cad work. If someone can do the outline of the sprocket in cad I could get the ball rolling faster. Dxf file. I have to focus on my own project. Wheels are in and I need to make this type of mount. Don’t want to mess with my disc brake mount position etc so attaching directly to the hub seems more doable. This is an advanced method from the 2 stroke guys that’s an upgrade to the rag joint mount. I can buy a mount and adaptor totaling $70 bit it would still need work as it’s not for 32 spoke wheels which is what I have. Going to look up a referral of a water jet cutter nearby. Ok tapping holes on a curved surface looks difficult. Might have to modify something like the last picture.

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