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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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How would you handle the rebalancing of a bearing cage?

I am a intern who was tasked with finding the correct amount to mill off (in an angle) of a bearing cage (basically an annulus with gaps in it to hold the balls or rollers) to bring it back into ...
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New Method for a Passive Magnetic Bearing

Is it possible to create a passive magnetic bearing by layering the outside of a shaft with a magnetic film and placing a magnetic ring on the outside. The outer layer of the film would have a north ...
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What is the difference between 7201 vs 7201 BEP Single Row Angular Contact Ball Bearings?

What does BEP mean when applied to types of ball bearings?
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One way bearings

I want to use one way bearings for a project, but there are some things I just can't figure out about them. So I know that a one way bearing restricts rotation of an axle in one way and allows ...
Jelle Lansbergen's user avatar
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Impact on high frequency radial forces on ball bearings

Dear Stackexchange forum, Do high frequency radial forces (e.g. 6kHz) do significantly increase wear and reduce the life span of ball bearings? I am looking for an expert in ball bearing research ...
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Moment at the end of the shaft, after a bearing?

I have an application with an interchangeable load. That can be swapped in a machine. The bearing and break are both mounted to different sides of the same plate The load is placed on two shafts that ...
Murtaza Bahrainwala's user avatar
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LED moving head bearing

I'm in the process of building a simple led moving head like This ADJ Pocket Pro, my POC will be much simpler but you get the direction I'm going. Electronics are working, now I just need a proper way ...
RektByMemes's user avatar
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how does this fastening system work

the bearing in the pictures below is securely fastened with some kind of rivet that doesn't take up any room on either side, so that the bearing can roll through some tight spaces while still bearing ...
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Gear systems' efficiency comparison

For a given system, that requires a shaft-gear(n)-shaft connection, which system's configuration would be the most efficient to use (in terms of total energy loss minimization). Where gear(n) is n ...
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In this “hybrid” ceramic 608 bearing is there likely a plastic piece holding the bearings?

I have some “hybrid” bearings that I purchased a long time ago on Amazon. They have silicon carbide balls and steel inner and outer races, as you can see in the photos. What I am wondering is what are ...
user391339's user avatar
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Is it acceptable to use a hand reamer on an X-Y CNC machined hole?

I would like to seat some bearings into a piece of aluminum, and I only have access to a small CNC machine. The CNC has ball screws and is calibrated to maybe 50um error in the actual travel on x and ...
user391339's user avatar
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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 ...
AirCraft Lover's user avatar
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380 views

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 ...
Daniel J. Greenhoe's user avatar
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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) ...
Kendrick Lee's user avatar
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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 ...
tinker102's user avatar
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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: ...
Saveer Jain's user avatar
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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 ...
Kaushik's user avatar
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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 ...
ERT's user avatar
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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 ...
xrosaber's user avatar
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1 answer
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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 ...
xrosaber's user avatar
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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 ...
Simon East's user avatar
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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 ...
itsazzad's user avatar
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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 ...
Ethan's user avatar
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1 vote
2 answers
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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 ...
ratib90486's user avatar
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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 ...
ratib90486's user avatar
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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 ...
jegenes's user avatar
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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 ...
php_nub_qq's user avatar
7 votes
6 answers
4k views

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. ...
Steve's user avatar
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1 answer
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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 ...
Motoko's user avatar
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2 answers
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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 ...
Kaushik's user avatar
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1 answer
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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 ...
joseville's user avatar
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1 answer
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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 ...
Sam Hammamy's user avatar
1 vote
3 answers
322 views

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/...
Bearingman99's user avatar
22 votes
5 answers
4k views

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 ...
Sam7919's user avatar
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1 answer
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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 ...
Gregory Kornblum's user avatar
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1 answer
52 views

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 ...
KevInSol's user avatar
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3 answers
654 views

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,...
BetterSense's user avatar
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353 views

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 ...
JCP's user avatar
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-1 votes
2 answers
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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 ...
nerdfever.com's user avatar
1 vote
1 answer
126 views

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 ...
jko's user avatar
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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 ...
scriptfoo's user avatar
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537 views

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 ...
Tony 's user avatar
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1 answer
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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 ...
roozbubu's user avatar
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1 answer
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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 ...
Ranjan Pal's user avatar