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 Drum Bearings

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Chris R

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Location : Pinetop-Lakeside, AZ

PostSubject: Drum Bearings   Tue Aug 30, 2011 12:19 am

My plan is to use a "dead axle" (I think that's what it's called) for my drum, and place bearings on the drum as to reduce friction with the axle. My question is, do you guys use bearings in your drum or vertical spinner bots? If so, which do you recommend?

It is a 15# bot.
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jeeves_m_d
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PostSubject: Re: Drum Bearings   Tue Aug 30, 2011 10:04 am

OPEN Roller Bearings!!!!

I have used them, and can vouch that they work beautifully and can take a beating!

The rollers are very crush resistant compared to the ball type!

They are also relatively cheaper, but the biggest advantage is there size, they typically have a much smaller OD, meaning you drill a smaller hole in the side of your Beater/Drum arm allowing you to keep more material where you need it most!
Mcmaster has almost anysize you need
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Chris R

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Registration date : 2011-08-30
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Location : Pinetop-Lakeside, AZ

PostSubject: Re: Drum Bearings   Tue Aug 30, 2011 12:36 pm

Thank you, I appreciate it. Exactly what I needed.

That also leads to another question however:

How would I mount the axle to the frame? Weld it on?

And the pulley on the drum, do I put bearings on that and bolt it to the drum?
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Koolaid64
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PostSubject: Re: Drum Bearings   Tue Aug 30, 2011 1:54 pm

you are fresh to the world of robotics, nothing wrong with that.

first major question: what kind of shop/tooling access do you have?
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Chris R

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Location : Pinetop-Lakeside, AZ

PostSubject: Re: Drum Bearings   Tue Aug 30, 2011 2:30 pm

I am indeed quite new to the field. santa

We have access to a 3-axis CNC machine (limited to 12", though), mills, a lathe, and a few other large machines.
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Koolaid64
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PostSubject: Re: Drum Bearings   Tue Aug 30, 2011 8:23 pm

lathes and mills, good.

what you will want to do for the shaft is to drill and tape on a lathe the largest bolt size you can in the ends without compromising the shaft. then you can bolt it to your frame, you may also want to make small recess the size of the shaft for it to sit in, this way all the stress of impacts isn't directly on the bolts. another method is to simply use shaft collars but i prefer bolting it on myself.

as for your bearings you want to drill out your pulley and end caps (again on a lathe) one fractional drill bit undersize of the bearings OD then use a reamer that is the same size as the bearings OD. then you can simply press fit the bearings in.

bolting the pulley to the drum would probable be the easiest solution, you could probable counter sink the the holes and use flat head screws for smaller, cleaner profile

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Chris R

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Location : Pinetop-Lakeside, AZ

PostSubject: Re: Drum Bearings   Tue Aug 30, 2011 9:27 pm

Wow, very informative. Thank you. I will definitely do that.

The roller bearings I have chosen are of the "needle" variety. OD is 11/16", with a width of 9/16", max load of 1,550lb's and max RPM's of 15,000. This is well within my expectations, but will this be sufficient for a drum?

Also (I apologize for asking so much. rendeer), the location in the drum where the bearings will be mounted, should the width be equal to that of the bearings (in this case 9/16")?
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