[RnD] How do you equalize caster wheel and drive wheel?

[Aleksandr Motsjonov]

Guys, Look at the picture - Imagine you have a motor, mount, platform, and a drive wheel attached to the motor. And you have a caster wheel. I want combination of all these things to make my platform horizontal.

But caster wheels and drive wheels are all specific diameters. How would you solve this problem?

Also, I have very urgent project and I can't wait china->oz time delay. I have these motors: http://www.ebay.com.au/itm/12V-DC-100RPM-High-Torque-Gear-Box-Electric-Motor-/320914239665 and I have mounts for them: https://www.pololu.com/product/2676

What I need is caster wheels (I want 2) and drive wheels (2) for these motors. I was looking at these cheepies: http://www.ebay.com.au/itm/2-50mm-Caster-Wheel-Swivel-Bolt-Castor-PICK-UP-AVAILABLE-Heavy-Duty-/190999211213 though I don't get what does 50mm stands for, is it the height from the ground to mounting plane? If so, I need wheels exactly 134.6mm in diameter. =\

I was thinking making wheels myself. Laser cut disks and do some cover for outside rim?

Anyone has an advice, experience, something to sell?

Sasha

[Aleksandr Motsjonov]

Just took a ruler and realized that 50mm is too much for mu project and resulting wheel d is too F*** big. I need much smaller caster wheel, 20mm max

[Aaron Power]

Not sure I if this is what you mean, but take a look at this example:-
    eBay - Basic Robot Chassis

They mount the caster with some threaded stand-offs between the platform and the caster. You can then adjust the length of the stand-offs to make your platform level.

Regards,
Aaron.

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[Nick Johnson]

If you need something smaller, consider a ball bearing roller instead.

[Gav]

Sasha, 

I've probably got one of these at home: http://www.ebay.com.au/itm/2X-StainlessSteel-Ball-Caster-Roller-Ball-Bearing-FlexibleTransfer-Caster-/291600837103?hash=item43e4c3a9ef:g:GZoAAOSwYHxWLxBU

Let me know if you want it and I'll bring it in. 

Cheers,

Gavin 

[Aleksandr Motsjonov]

Thank you, Gav. This will drive on a carpet like surface, so I am not sure if ball caster is what I need. And I need two.

I think I will go with what bunnings can offer, they have one with 40mm wheel size.

[Samuel Bruce]

Pages for castors on the bunnings website list an overall height in mm in the product details - as you put it, height from the ground to the mounting plane. If it's not on the site it will be on the packaging.

Dealt with a similar question when building a cabinet recently. That thing is the perfect height now.

[Ada Lim]

On 23 Nov 2015 10:23 pm, "Aleksandr Motsjonov" <sos...@gmail.com> wrote:
>
> Guys, Look at the picture - Imagine you have a motor, mount, platform, and a drive wheel attached to the motor. And you have a caster wheel. I want combination of all these things to make my platform horizontal.
> But caster wheels and drive wheels are all specific diameters. How would you solve this problem?

Smaller caster.   Shims.

[Aleksandr Motsjonov]

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