Plastic filament won't work for bearings here, because the bearings must move
freely on rods even when twisting pressure is applied.

My main problem is a dire need to make 8 mm bearing seals that actually fit
the 8 mm rod. The silly rubber seals that come with cheap bearings have a gap
wide enough to allow tiny particles into the bearing.

Any ways to make close-fitting but easy sliding bearing shields out of
whatever material?

Thanks.

On 06/04/2021 21:41, John Doe wrote:
Plastic filament won't work for bearings here, because the bearings must move
freely on rods even when twisting pressure is applied.

My main problem is a dire need to make 8 mm bearing seals that actually fit
the 8 mm rod. The silly rubber seals that come with cheap bearings have a gap
wide enough to allow tiny particles into the bearing.

Any ways to make close-fitting but easy sliding bearing shields out of
whatever material?

Thanks.

Design something and print it with TPU filament with an ID a bit smaller
than 8mm, that's assuming your 3D printer can handle flexible filament.

On 04/06/2021 01:41 PM, John Doe wrote:
Plastic filament won't work for bearings here, because the bearings must move
freely on rods even when twisting pressure is applied.

My main problem is a dire need to make 8 mm bearing seals that actually fit
the 8 mm rod. The silly rubber seals that come with cheap bearings have a gap
wide enough to allow tiny particles into the bearing.

Any ways to make close-fitting but easy sliding bearing shields out of
whatever material?

Thanks.

8mm valve stem seals.

Viton® fluoroelastomer, Teflon... no silly rubber.

And springs wrap around them. See?
https://i.ebayimg.com/images/g/ZfIAA...N8m/s-l800.jpg
Nothings getting past these.

On Tuesday, April 6, 2021 at 1:41:59 PM UTC-7, John Doe wrote:

Any ways to make close-fitting but easy sliding bearing shields out of
whatever material?

For sliding on a rod, a good seal is a bellows around the rod... which
also keeps dust off the sliding surface.

Another traditional method is to use felt (oiled, perhaps) or leather against
the sliding surface.