Questions tagged [bearings]

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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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1 answer
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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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0 votes
2 answers
69 views

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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1 answer
28 views

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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1 answer
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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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2 answers
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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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Ball bearing additional sealing

I have an aplication of grinding machine which uses set of grinders which are located on the shaft to grind grooves for rubber sleeves on inner surface of composite pipes (diameter of 300 mm to 3000 ...
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Positive and negative voltage readings across a rig simulating bearing contact, supplied with a DC source

I recently ran a few experiments to simulate the effects of shaft voltages on motor bearings through using a simplified experimental rig. The rig simulates bearing contact. I applied a DC source ...
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7 votes
6 answers
3k 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. ...
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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 ...
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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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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 ...
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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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1 vote
3 answers
162 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/...
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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 ...
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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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1 answer
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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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3 answers
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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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0 votes
1 answer
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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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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 ...
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1 vote
1 answer
62 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 ...
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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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0 votes
1 answer
70 views

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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1 answer
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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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1 vote
1 answer
75 views

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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4 votes
3 answers
279 views

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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4 votes
1 answer
128 views

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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2 answers
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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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2 votes
2 answers
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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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-1 votes
1 answer
44 views

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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4 votes
0 answers
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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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3 votes
0 answers
44 views

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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1 vote
2 answers
63 views

Wire bearings on actuators on military ships

While reading about the Korvette K130 Braunschweig class of corvettes for the German navy, I noticed that almost all of the weapon systems are held in what I'd call a wire bearing. I'd like to know ...
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1 vote
0 answers
189 views

Open bearings in a Schaublin 70?

I would like to clean and change de belt in a Schaublin 70 Lathe, but when removing the main shaft, I noticed this weird bearings: How would I remove it what should I take care about?
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3 votes
1 answer
842 views

What are 1 ball and 2 ball bearings?

When looking at various small fans (like those found in a computer or the bathroom) you often see in their specifications the type of bearings they use. And the typical values there are either "...
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0 answers
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Where do I learn about jewel bearings?

I would like to take a deep dive into the world of jewel sourced watchmaking components (including, but not limited to, bearings) but I am having trouble finding any textbooks on the subject. Are ...
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1 vote
1 answer
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Assess bearing force ratings [closed]

Suppose that a ball bearing has axial and radial force ratings of 300N. If the bearing is to hold a 1m long shaft in its bore with a 1kg load on the end of the shaft, will the ratings be exceeded? The ...
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1 vote
0 answers
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Secure loads to gearbox shafts

I have a sculpture that is designed to rotate over 3 axes at max. 30RPM and is mounted on an aluminium disc. My plan is to use 3 of these geared steppers and secure the sculpture to the Z-axis shaft, ...
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2 votes
0 answers
19 views

ZARN bearings vs thrust tapered bearing pairs

Does anyone know how needle assemblies like this stack up against having a pair of thrust tapered bearings back to back in terms of radial and axial load? That is, a bearing like this: as opposed to ...
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1 vote
0 answers
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What is the difference between sommerfield number and bearing characteristic number in bearing design?

After reading a few texts on the topic of sliding contact bearings I am confused between the bearing characteristic number and the sommerfield number. As per J.E shigley's text both bearing ...
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1 vote
1 answer
48 views

buying a mounted bearing determining radial vs axial load it can bear

Can anyone tell if these bearings load ratings are for a radial load or an axial load ? Bearing designed for an axial load is (sometimes?) called a "thrust bearing". Based on its mounting, I guess ...
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1 vote
1 answer
214 views

Why rotation factor of bearing for inner ring is 1 and for outer ring is 1.2?

V is a rotation factor to account for the difference in ball rotations for outer ring rotation vs. inner ring rotation. V = 1 for inner ring rotation V = 1.2 for outer ring rotation From Shigley's ...
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2 votes
1 answer
31 views

Linear guide ball bearings

I'm planning to drive a small linear guide (4cm long) with a servo in a setup like this: I wonder if the ball bearings inside would sustain too much stress due to the vertical forces exerted by the ...
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1 vote
0 answers
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Wobbling DC motor head

I have used 250 watt DC motor, for DIY electric potters wheel. Motor rated with RPM 3300 and geared reduction to 330 RPM. The issue I am facing is wobbling of the motor head. This issue is with the ...
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