Questions tagged [bearings]

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43 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 ...
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3answers
55 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,...
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1answer
69 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 ...
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2answers
36 views

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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1answer
43 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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1answer
53 views

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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105 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 ...
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1answer
29 views

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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1answer
34 views

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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1answer
43 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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29 views

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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1answer
52 views

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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1answer
49 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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3answers
204 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 ...
4
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1answer
79 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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2answers
41 views

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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2answers
64 views

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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1answer
41 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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0answers
71 views

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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0answers
41 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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2answers
57 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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20 views

How to fix a shaft in position, vertically [duplicate]

I am doing a project where I have to mount a gear shaft with two bearings on either end (deep groove ball bearings) but I am worried that they may fall through the bearings during operation as the ...
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0answers
103 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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1answer
750 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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0answers
31 views

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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1answer
31 views

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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0answers
18 views

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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0answers
17 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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0answers
65 views

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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1answer
41 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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1answer
107 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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1answer
25 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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0answers
89 views

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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65 views

Etymology of the term “journal bearing”

Typically the word "journal" refers to a collection of written records, experiences, or transactions. However, there is a common type of bearing known as a sleeve bearing, radial bearing, or journal ...
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2answers
172 views

What is the exact concept of bearings?

Mechanics books always highlight that the main advantage of bearings is to reduce friction, especially when we talk about them in rotational motion applications. The example of ball bearings is always ...
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2answers
79 views

Cascaded ball bearings

Around where I live there's these soapbox/gravity kart races (google "carros de rolamentos") in which the wheels are built simply from ball bearings. As I was building my own, I began wondering how I ...
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123 views

Rotating vertical pole setup

software person here, venturing for the first time in the design of a mechanical system for a hobby project. Please note I have some experience in disassembling, fixing, reassembling mechanical ...
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1answer
40 views

How/why lubricating a rolling bearing would make them spin less time (dissipate energy faster)?

I have lubricated the ball-bearings of two hand spinners (the anti-stress toys) and contrarily to my expectation the time they keep on spinning has been divided by four. One fact I have noticed, the ...
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4answers
67 views

bearing keeps burning seals

The front shaft support bearing on my front deck lawnmower keeps burning out its seal. Typical scenario: PTO coupling catches long strands of grass which wraps around the PTO coupling, and also ...
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1answer
643 views

Difference between Allowable Bearing capacity Service and Ultimate?

When we calculate the dimension of a foundation we always use the allowable SERVICE bearing capacity (lets call it qs) and all the necessary checks are based on this value qs. My question is why does ...
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28 views

What type of bearing should I use to allow a ring to rotate around a fixed axle

What type of bearing should I use to allow a ring to rotate around a fixed axle. Axle is horizontal. The rings inner diameter can be flush with the stationary rod or have a gap as needed. What type ...
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2answers
67 views

What kind of mechanisms are there to give an object free rotation?

I am doing a project where there is a plate with a hole on it where one ring will be mounted. The ring and plate need to be attached somehow. However, the ring must be able to rotate around the roll ...
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4answers
398 views

When reaming a hole to fit a bearing, can I get an underfit by icing the workpiece?

It's my first time working with bearings, but this is a necessary part of my robotic arm project. I have some $10 bearings that are 24mm OD. I want to fit these tightly in a hole, ideally getting a ...
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3answers
65 views

How to make a choice between rolling element bearing and journal (plain) bearing?

I wonder if there exist a formal guideline to help engineers choosing the right type of bearing. Except in some few cases, this is not very evident to me. As far as i know, the plain bearing ...
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4answers
533 views

Jet Boat Engine Part Identification

If anyone can provide me information about this part right here, please tell me.
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0answers
26 views

Why can't we use air bearings for Hyperloop? Why isn't it feasible?

Why isn't the usage of air bearings for HL feasible?
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1answer
389 views

How to choose between two possible arrangements of tapered roller bearings?

I don't know how to decide between the $X$ and $O$ arrangement, i don't have any specific example at this moment, but i want to know. Catalogues offer only some basic calculations. I'm not quite sure ...
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38 views

Can I lift 15 tons on air bearings with 0.2 kg air/s?

The air is at 13 kPa and 400 K. I can raise both the supply temperature and the pressure if necessary. No problem with that. I could get 1.7 kg/s for the air bearings, but I have no more air. I ...
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30 views

Is this is a valid estimation for the mass flow required for Hyperloop air-bearings?

In Hyperloop air bearings, the air escapes through the rear cross-sectional area of each ski, you know? Yes, there is a pressure differential, but the air comes out of the skis, crashes into the tube ...
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34 views

Why have some Hyperloop researchers abandoned the air bearings initial idea?

Air bearings are a cheap solution for Hyperloop, unlike the costly magnetic levitation system. I'm consulting some sources and it seems there's enough air in the tube at 100 Pa to feed the air ...