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Fun-Palpitation81 OP t1_j2pemzd wrote

Reply to comment by derphurr in Proper use of ball bearing for a vertical rotation (azimuth rotation for a ground station) by Fun-Palpitation81

thanks!

I'm a little confused about which side i would attach the dish too.

Here is a picture.

Does the dish attach to the inside, and if such, wouldnt all of the weight be on the bearings (as there is nothing to support it underneath).

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derphurr t1_j2pfymp wrote

Correct, they should have ratings, usually hundreds lbs to 30,000 lbs.

If there are teeth on outside, you can drive it with a belt or teeth. But the stationary side didn't have teeth.

You haven't indicated any idea what kind of weight you need to rotate.

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Fun-Palpitation81 OP t1_j2phrbb wrote

the dish is actually a model, thus the weight is not that important. However, I wanted to design it realistically to what would be done.

Thus, I should put teeth on the inside ring, and drive it using teeth on my stepper motor. To increase the "torque" on my stepper, I believe I can also use teeth ratio

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derphurr t1_j2plh38 wrote

Omg... Whatever

HOW MANY FUCKING LBS DO YOU WANT TO DESIGN THIS FOR? 20,100, 5000?

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Fun-Palpitation81 OP t1_j2pmvbd wrote

~ 500 grams

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derphurr t1_j2q1z2m wrote

Lolol. (Unless you meant kg)... You could mount it directly to stepper shaft. But technically risk eventually wearing out motor.

Maybe a small right angle gear box. https://www.ondrivesus.com/miniature-gearboxes

You certainly don't need any significant bearings.

I would personally hose clamp tubing between the two shafts as a coupler and put little wheels/dollies/ upside down ball bearing wheels for antenna assembly.

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discretion t1_j2soz24 wrote

Per the last comment he made that you replied to, this is for modeling purposes. So "just whatever" might work for a 500g dish, but it won't scale.

Just throwing that out there.

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