Questions tagged [bearings]
A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts. The main use of bearings is to support a rotating shaft. There are several types of bearings, with different principles and rolling elements, for example: Ball bearing and roller bearing.
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What is the explanation of why does gasoline leaks from a bearing seal but oil does not?
The above is a bearing with rubber seal. Such bearing is used in automotive engine. With that rubber seal, the lubricating and cooling oil inside the engine the oil does not leak. But when the oil is ...
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Correct beam theory for calculating radial force in bearing due to a bending moment in beam?
I am designing a cylindrical shaft that has a round disc at its top. I am hoping to seat this shaft in 2 radial bearings and couple to a motor. The image below gives an overview of the loading diagram....
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Fundamental Frequency values for Rexnord ZA-2115 bearing
I am having difficulty coming to terms with the Rexnord ZA-2115 bearing technical specifications. This bearing is used in the NASA Bearing Dataset where the Rexnord bearings are tested at 2000 RPM ...
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How are sealed bearings assembled?
Sealed bearings are a common component on modern bicycles.
Even if you take off the plastic covers of sealed bearings, the ball bearings inside will not fall out.
How is such a part assembled in the ...
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Where would I place a bearing between 2 surfaces?
I'm a high-school engineering student, and for my final project I wanted to make a robotic arm.
However, I'm stuck on how to minimize friction between 2 surfaces (both made out of aluminum 6061-T6) ...
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Vertical reaction on a shaft with 3 bearing supports
I am doing an analysis on a shaft loaded by a gear at point B and supported by three bearings at points A, C and D. Is it possible to solve for reaction forces in the vertical direction for points A, ...
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How to specify bearing clearance fit for fabrication shop
I have a bearing with outer diameter 100mm and inner diameter 55mm. The bearing sits on top of housing unit A, and housing unit B sits on top of the bearing. Diameter d1 fits with the bearing's inner ...
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ball bearing on every gear?
I'm new to engineering but I have a project with a lot of gears.I was wondering if it was plausible/bad/good to just stick a bunch of mini ball bearings on every single gear. I was looking into these: ...
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How do bearing companies calculate their bearing's dynamic load rating?
I can find L10 and L50 life of bearings on the bearing catalog and use that to find the life of bearing for a certain load 'F'. But I can't really find any references on how these companies find ...
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How does bearing reliability factor effect the static safety values of a bearing?
I have a SKF 30202 style bearing and i found that the static safety factor of this bearing is 2.76 for a reliability of 90% how does the static safety factor change if my reliabilty was 99%? How can i ...
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What is the advantage of "carriage"-style bearings for telescope domes, lighthouse lenses etc.?
19th Century technology sometimes involves large-scale bearings. I am curious about the "chariot"-style bearings used in lighthouse optics, and the similar bearings used to support rotating ...
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Can lazy susan's handle moment loads? If so, how to determine the magnitude of moment load it can take?
Can lazy susan's like this or this handle moment loads? If so, how to determine the magnitude of moment load it can take?
I've searched online but couldn't find anything on whether the bearings of the ...
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Will a lazy susan in the pan mechanism of my pan-tilt system be suitable?
Currently, I'm trying to up with a design for the pan mechanism. The pan-tilt system itself will be mounted with a couple different antennas such as yagi-uda and patch antenna. I'm designing the ...
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In AutoCAD 2015 is it possible to dynamically label a line with bearing and distance?
In my AutoCAD 2015 project, I would like to label lines with a bearing and distance, similar to the image below, ideally in a way that allows them to dynamically update if I adjust the lines.
I've ...
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Can Friction Pendulum Bearing/System (FPB/FPS) suppresses the effect of an earthquake from every direction or only from one direction?
Can Friction Pendulum Bearing (FPB) AKA. Friction Pendulum System (FPS) suppresses the effect of an earthquake from every direction or only from one direction?
Please take a look at the tests which ...
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Bearing housing tolerances for mountain bike suspension pivot with through axle shaft
I have a Privateer 161 full suspension mountain bike. Ever since I bought it, most suspension pivot bearings run roughly when pressed into the frame. After the first 3 months I had the bike, I removed ...
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Passive magnetic bearing coefficient of friction
Imagine two axially-magnetized ring-shaped permanent magnets in a repulsive configuration where one is levitating on top of the other (and somehow radially constrained so the PMs remain ~concentric). ...
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Will the cart steer to the left/right by itself in this design?
I'm trying to retrofit a pull cart with electric motor. So, one wheel will have an electric hub motor and it is connected to a rotating shaft to the other non-powered wheel. The driveshaft is ...
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Could radial bearings with brackets hold the weight and load of a large cart
Me and my partner are trying to build electric pull carts to assist elderly Korean women and men who collect paper boxes for a living. These boxes are sold for recycling.
They work virtually at every ...
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How to Keep Bearings From Binding
This is a capstan for a stringbender for an acoustic guitar. When actuated, the String Wheel turns about 15-18 degrees. It does NOT spin, but simply turns, then is pulled back to "zero" when ...
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Does the corbel angle govern in this scenario? If not, how is load spreading allowed for, when a load is supported by a wall on a beam
The following outline is inspired by something I noticed today and couldn't figure out.
It shows what I guess is a fairly common generic situation - an upper floor masonry partition wall supported by ...
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Can ball bearings pop out of housings?
I'm making a 1 seater vehicle. The rear axle is split into two drive axles both of which are supported on a set of a couple ball bearings mounted to the frame with housings like the following:
I ...
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Is there such a thing as a sand-proof bearing?
I am working on a piece of art that has parts that rotate slowly, at about 1RPM, thanks to a couple of bearings. There is a possibility that it might be installed beside a beach for about a week. ...
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What type of ball bearing is this?
I don't have engineering background. I'm looking for this telescope' altitude bearing below. I understand it's a type of ball bearing, but does anyone know the exact name of this type?
There are 2 ...
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How to calculate press load for an interference fit with no friction coefficient between the materials (shaft & hub)
Press-fit load calculation always takes friction into consideration and gives you the load expression as follows,
$$F = µ\cdot PA$$
where µ is the friction coefficient, P (Interference Pressure) is ...
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Is there such a thing as a double roller/bearing? Two rollers/bearings that share one axis, but can roll independently. [linear/pivot]
I'm looking for two track rollers or bearings that share an axis, but can roll independently of each other. Ideally, they are compact as well ($\leq 1 \text{ in}.$ diameter) and can handle a moderate ...
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What does a dual bearing motor mounting system look like?
I came across the following excerpt about how to mount wheels:
The most robust system is the dual bearing system. In this, the wheel
axle is mounted on two bearings and chain driven. This takes all ...
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Why does the taper on tapered-roller bearings help support axial loads?
My assumption is that the taper/conical shape helps separate pure axial/radial loads into a combined load.
For example, a pure axial load should also produce a radial load component in the conical/...
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How do ball bearings not crack from a load concentrated on an infinitesimally small point?
How do ball bearings last? Most bearings in a standard hub (bottom of the image) are not actually taking a load. Only the single ball that happens to be at a particular location while spinning takes ...
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What equipment do I need to install a bearing?
I am not a mechanical engineer :) I feel much better with electronics, but I have a project in your domain now.
So, I have an aluminum housing, a steel bearing and an aluminum axis. I need to put them ...
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Inconsistant load cell readings - (static) fiction perhaps?
First off I'm not an engineer so please excuse the simple language I use to explain my question!
I have an arrangement whereby I have a steel plate suspended from basically a bridge. The plate is free ...
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Conventions regarding sliding and press-fit tolerances for shafts and bearings
I often build things (3D printers, skateboard wheels, bicycle parts) that use off-the-shelf ball-bearings. These ball bearings are available in nominal mm sizes, and to the limit of my measuring tools,...
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What type of fastener / rivet is this please?
I think I may have worked this out but I would love it if a real engineer could confirm it please? Is the fixing shown in the photos a shoulder rivet? Semi tubular? For the record the pictures show ...
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Appropriate bearing to spin a dove prism?
I want to spin a dove prism (image rotating prism) around it's long axis at a controlled rate (100 to 300 RPM). The purpose is to get a de-rotated image of a spinning object (by looking through the ...
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Applying ISO fits to radial bearings
Do you need to take the bearing size tolerance into account when creating the tolerances for the mating hole/shaft when using ISO 286 tolerances?
For example, a 125 mm OD bearing with a desired H7 ...
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How this adapter inside the bearing is called? How to find/make a replacement?
This is an ABEC7 bearing with a 12 mm hole and a 19 mm external diameter:
It has a tightly mounted adapter (the black part), which in turn has a 6mm hole and two external diameters: 12 mm (partially ...
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one way bearing in solidworks
I'm relatively new to solidworks and i would like to know if there is a way to mate a bearing in solidworks such that it acts as a one way bearing. In the rack and pinion setup in the figure, the rack ...
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How does the Nest Learning Thermostat bezel rotate without bearings?
Looking at both the Nest iFixit teardown and this Nest bezel replacement tutorial, it looks like the Nest stainless steel bezel mounts directly to the PCBs and displays inside.
The Nest bezel is able ...
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Identify bearing dimensions from its bearing number
In motors/pumps generally following bearings are used (ref: https://www.nke.at/en/bearings-applications/applications/electrical-motors):
Deep groove ball bearings
Cylindrical roller bearings
Angular ...
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How to mount skateboard wheels to an t-slotted framing
What is the best way to attach skateboard wheels to an t-slotted framing?
Also, is there a more economical way?
Bonus: How to design shock absorber for it?
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How to disassemble this eccentric bushing
This eccentric bushing:
belongs to the hand crank of this machine:
It cannot be seen clearly in the photo, but the small blocking bar inside the bushing is not hovering over but rather, is sunk into ...
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What is the correct method to remove or tighten this splined "nut"?
This photo shows the input shaft of an air compressor head.
The splined cog-looking disc around the shaft is actually a sort of threaded nut which screws into the larger disc around it. It serves to ...
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CNC side linear rails
I've been wondering why most (hobby) CNC machines have two actuated linear rails like this:
Besides the extra force for moving the spindle, is there a need for both rails to be actuated? Could the ...
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Off-centre actuation
I'm trying to lift a platform with several guides using a linear actuator, but off the centre as follows:
The load on the platform will be around 100kg, which is just within the linear actuator's ...
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Radial vs thrust bearings for assembling a lift mechanism
I'm a total novice and self taught, currently designing and building a workbench for woodworking with an adjustable height top. This is the last major part to finish and I'm having trouble determining ...
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Is there a reason for the bearing to be held in place by this flimsy star chamber rather than a solid seating?
I have no engineering background at all, but when I bumped my small electric heater and it started whining and creating a burning smell, (since it's labor day with no stores open to buy a new one) I ...
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How can I prevent twine from wrecking spindle bearings in a mower?
I have a grasshopper 725D mower. This is a 3 blade ztr mower.
Blades are mounted on 1"shaft that passes through a pair of 1" x 2" x 1/2" bearings. Bearings rest on a step in the ...
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Looking for specific bearing
I am new to mechanical engineering so I don't know the terms for different bearings.
I'm trying to make a honey extractor. I have a rotating basket made out of stainless steel that is going a maximum ...
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Worm Drive Clutching Mechanism
Problem Description
I have a project where I will need to be able to engage and disengage a worm drive (actually two of them). The worm drives are quite small. The worm gear is 49.2mm in diameter ...
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Can You Identify This Deep Groove Ball Baring Bearing and/or Give an SKF Equivalent?
I am changing out my motorcycle engine bearings from the Chinese CJB brand to a high quality brand like SKF (Explorer range).
I am still waiting on a heat gun in order to remove the bearings from the ...
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