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Video: Rolamite Linear Actuator Lowers Friction

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William K.
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Platinum
Re: No Lubrication Needed
William K.   3/22/2014 6:10:48 PM
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Don, the application was indeed a linear application, and the timing was just a few months after the rolamite was first presented as a fundamentaly new mechanical concept, like the wheel and the lever. Back quite a few years.

Donald Rich
User Rank
Blogger
Re: No Lubrication Needed
Donald Rich   3/22/2014 8:16:20 AM
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Sounds like you saw a rotary version of Rolamite. The linear version which I have employed

is very compliant in my design since the rollers are free floating and hence the carriage floats. Don

William K.
User Rank
Platinum
Re: No Lubrication Needed
William K.   3/21/2014 9:46:55 PM
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D.R For your Rolamite bearings to have compliance they must be an improved version of the originals. The very first ones that I saw were used in place of linear ball bearings, with non-grooved races replacing the standard ground groove races used for the bearing balls. The adjustment was for zero backlash, and they did exibit much less friction than the ball bearings, plus being more ridgid. So I had not heard of any with compliance, which is indeed required to survive contamination.. 

Thanks for the update, and the offer of communication, but currently I have no application for them. But now I know one more option to present to folks who need a solution to problems.

Donald Rich
User Rank
Blogger
Re: No Lubrication Needed
Donald Rich   3/21/2014 4:58:46 PM
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Hi Bill,

My Rolamite actually has built in compliance, while difficult to see the rollers float and can accomodate very significant foreign matter. Rigid bearings accomadate nothing. If you want more info give me a call...908 319 6767    Don Rich

William K.
User Rank
Platinum
Re: No Lubrication Needed
William K.   3/21/2014 3:39:57 PM
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Don, the Rolamite does have quite a few advantages over ball bearings and over any kind of bearings. BUT it seems to me that they would still be subject to jamming from dirt in the way, since there is no clearance of compliance inherent in the structure, at least none that I can see. So while it is more able to handle hostile conditions such as moisture, it may not be much more tolerant of dirt than a ball bearing, unless allowances are made in the design of a system. 

Donald Rich
User Rank
Blogger
Re: No Lubrication Needed
Donald Rich   3/16/2014 3:25:10 PM
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Rolamite Bearings are incredibly restistant to contamination. They do not freeze, skip,

or jam like ordinary ball or sliding bearings. They are an ideal choice for a hostile

environment type application. Don Rich  908-319-6767

Greg M. Jung
User Rank
Platinum
No Lubrication Needed
Greg M. Jung   3/16/2014 12:54:15 PM
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Low friction bearings that eliminate the need for lubrication could be very useful in 3D printers that runs for hours at a time.  Would these bearings also be resistant to the dust creation that also occurs with some 3D printing technologies?

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