I'm designing a new gearbox that operates submerged in water, and working on calculating how much oil I need, and if I need a breather for the vapor pressure buildup (hoping not).
What references exist for determining oil type and level required?
What references might you have for determining...
Following up from this conversation: thread821-159659
Can a cylindrical roller element bearing support a moment load?
I would assume the calculation would be the assumption of a point contact at the ends of the roller from a radial force couple. The equivalent radial load being that due to the...
@WKTaylor, is there another coating process for aluminum, particularly 7075 series that can be both cosmetic and have a lower effect on fatigue life? Or just suck it up and consider the expected load capacity/fatigue reduction?
here's a reference I found regarding fatigue life for anodized...
These are all great responses and I appreciate the detail.
@WKTaylor I've never heard of the epoxy primer surface coating, is this acting as a chemical surface passivation? Also, I often will lead a hole (the lip) with a chamfer to help with bearing insertion, but are you saying you...
Thanks jgKRI. My experiences has also been for threads it doesn't make much difference since there's clearance in the threads anyway. For bores though the the 0.0005" can make a difference. I'm usually operating in the 1/2-2in diameter bore range. I had a supervisor who just oversized his bores...
I've got some bearing bores that I want some tight tolerances for proper interference fits. Should I have the machinist mask the bore prior to anodizing, or specify tolerances on finished part, fully anodized?
I guess I'm wondering how to account for the plating thickness (since it can vary)...
Oh, great recommendations. I'm looking into the plain bearings now.
I had never heard of the rocking contact pin joint, though I have been considering something similar for another application that uses straps to enforce the no-slip rolling condition. Thanks for that recommendation, it's good...
Thanks.
What about starting torque (stiction) between a plain bearing and needle? You noted higher efficiency expectation for the plain bearing due to shorter radial distance to the applied friction for similarly rated component. But I wonder is the static friction or roller inertia greater...
I don't see this in practice much so I wanted to know: if anyone as experience with using a split bearing cap to make a housing for a rolling element bearing. In particular I'm looking to use a relatively narrow section (6903) deep groove ball bearing with a rotating shaft for oscillatory...
I've been digging through the catalogs but have had some difficulty finding the allowable axial misalignment of a needle bearing (drawn cup or otherwise). I've got an oscillatory application (~10degrees motion) that has limited radial space, and requires a yoke to reach to either side of the...
