Questions tagged [bearings]

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2
votes
4answers
69 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 ...
1
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3answers
35 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 ...
2
votes
3answers
179 views

Jet Boat Engine Part Identification

If anyone can provide me information about this part right here, please tell me.
0
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0answers
19 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?
0
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1answer
29 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 ...
0
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0answers
30 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 ...
0
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0answers
26 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 ...
0
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0answers
20 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 ...
0
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1answer
19 views

Cad file for turnstile mechanism/ one-way clutch/ one-way rotation?

I am writing my first 3D cad-file and I want to place into it a turnstile mechanism (a mechanism that allows a fixed axis to rotate only one way, and not in the opposite). Are there cad-templates for ...
1
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2answers
75 views

Refute my assumption: Bearings Don't Improve Efficiency

If two surfaces rub together with a normal force between them, friction is generated. You could add lubrication between those two surfaces and reduce that friction. Bearings essentially consist of ...
0
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1answer
63 views

Name that bearing!

Does anybody know the name of this type of bearing?
0
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2answers
41 views

Designing a joint with bearing, how much do I need to protrude for the bearing to stand? With pictures

Hello all I'm designing a joint that needs a bearing to fit central but I'm wondering whether I have to protrude a bit on both parts so there will be some gaps between the bearing and the parts which ...
0
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1answer
31 views

What kind of bearing should be used for free rotation under load?

Let's say I have a 300 rpm motor and a roller connected to it's shaft and I would like to use it for pulling fabric from a printer-kind machine. But think that printer's printing speed is changing ...
2
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1answer
38 views

Waterproof Pan control/bearing/mechanism

Please bear with me - I'm not an engineer, I'm a software developer so lack the language / knowledge to describe what I want precisely. I'm controlling a servo to rotate /pan a platform to hold a ...
2
votes
1answer
89 views

What is the type of bearing used on swivel base chairs?

I'm designing a chair from scratch and I'd like it to have a swivel base. For this my initial idea was to press fit a bearing (thrust bearing) in the shaft of the base and connect the seat by press ...
1
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0answers
125 views

How to calculate bearing loads in a two stage helical gear box?

Here P, Q, R, S are the bearings and G1, G2, G3, G4 are four helical gears. The gear forces tangential(Kp), Axial(Ka), Radial(Kn) are known. All the distances are known. The forces acting on bearing ...
2
votes
2answers
91 views

How does an air-bearing “pre-load” work?

I've been reading into air bearing recently and keep coming across the term "pre-load". References online and wikipedia both state that a pre-load helps stiffen the bearing such that their is less ...
1
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2answers
42 views

Dose adapter sleeve hinder the axial displacement of inner ring of spherical roller bearings?

This is supposed to be the locating bearing in my design, the outer ring is supported by the housing and a taconite seal (taconite seal is hidden). So it is fixed in place and can't move at all. ...
0
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2answers
366 views

Do wave washers need to be on either end of bearings in double bearing induction motor

I have a typical small electric induction motor given to me in pieces. It has two wave washers which I am told should sit between the bearing and the assembly. I am not sure which bearing needs the ...
2
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1answer
35 views

What is the typical rpm variance-tolerance of a roller bearing?

I have a high speed roller bearing rated at 3000rpm. I know in the electrical industry that tolerances of around 10-15% are built into components so that they continue working in fluctuating ...
1
vote
1answer
346 views

What does 1 x rpm or 2 x rpm or 3 x rpm in vibration analysis mean?

a description for virbation monitoring of industrial bearings states: peak amplitues at 1 x rpm should be an indicator for a fault in my case. Can somebody explain me what I have to understand ...
1
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1answer
40 views

Blind bearing bore design

I've tried to find some rules of thumb about this without any luck. I'm designing a part with a blind cartridge bearing bore. It's a 624 bearing (13x4x5) and the fit size guides point me to a ...
0
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1answer
57 views

What's the difference between simple and deep groove ball bearing

What's the difference between simple ball bearing and deep groove ball bearing? EDIT: I read about them in my textbook of design. The book has only mentioned that there are teo types of ball ...
2
votes
2answers
184 views

What does it mean that a ball bearing can handle thrust load but a roller bearing can't?

I can't wrap my head around it so if someone could explain this to me. According to http://www.vncbearing.com/roller-bearings-vs-ball-bearings-major-differences/ ball bearings can handle thrust loads ...
0
votes
1answer
71 views

Can a sleeve bearing adapter be used with a plain bronze bearing?

I am looking for a replacement bearing for an old lathe. The lathe spindle assemble features a collet-like bronze bearing with a nut for tightening the inner diameter. Unfortunately, I cannot find ...
0
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1answer
124 views

Pan and tilt mechanism

this is my first project that i am working on. I want to make a IR sensor mount using stepper motors. I seen this on youtube and would like to make a similar design. I plan on using aluminium ...
2
votes
2answers
374 views

Sealing a rotating shaft in a 3D-printed part

I need to seal a rotating shaft that protrudes through a wall in a 3D-printed enclosure I am designing for a school project. The enclosure is for what will be a small generator that will be used in ...
7
votes
1answer
201 views

What is this kind of bearing called

I came up with this concept for a partial rotation, lubricant free, low friction bearing for a robotics application. Two complementary sets of tensioned tendon-like cables (or tapes) serve both to ...
1
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0answers
35 views

double effect roller bearing or two needle roller bearing

Good morning, I need to source 30 or 50 bearings such as the picture. This is a double effect roller bearing and the mid washer is drilled as you can see. Shaft diameter: 17mm Height: 22.26mm Speed ...
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0answers
40 views

Coefficient of Friction, Passive Magnetic Bearing

While comparing magnetic bearings to others ceramic bearings, a rough first point maybe to compare would be the two different bearings' coefficients of friction. This is just a thumbnail comparison ...
2
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1answer
150 views

Bearing and Bearing Housing for Said Design

The system that I'm working on has a rotating cylinder (cleaning head). It needs to rotate vertically between two arms, much like a cleaning brush in a car wash. Note: I have not considered how the ...
1
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2answers
158 views

Multilayered Bearing Spinner

I have a few questions relating to a multiple layered spinner that uses ball bearings to reduce friction, kind of similar to a fidget spinner. The image below is an example of the multilayered bearing ...
0
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1answer
32 views

when is an inclined force analysed?

problem 1-5, James M. Gere's mechanics of materials text book in the given example : for a, b and c he used the full 12k value of P to get the bearing and shear values. my logic was to analyse the ...
0
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1answer
30 views

What is the hardware called that can step a lever N degrees upon manual force?

I'm trying to build a step stool that has a rotating chair back that will rotate from top position (e.g. chair) into bottom position (e.g. step stool). I do not want a free rotation of the chair back ...
2
votes
1answer
283 views

Does oil actually “attract” dirt?

The conventional wisdom consistently holds that "oil (or grease) attracts dirt", giving rise to the need for seals and dry-lubricants. But I've always considered that to be loose thinking, the truth ...
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0answers
21 views

Angular Contact Bearing Dynamic Loading

Does having multiple angular contact bearings together increase the total dynamic loading of the system linearly? Example: Angular contact bearing with rated dynamic loading at 50kN, thus 3 of them ...
2
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0answers
47 views

Rotating four cylinders with one motor/actuator

I have a setup with 4 cylinders placed next to each other in following configuration. The cylinders are made of .2mm stainless steel. I would ideally want to rotate them along their axis using a ...
0
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2answers
262 views

How to design a rotating base?

I have no formal training or professional experience as a mechanical engineer. I would like to design a rotating base that is powered by a motor. I would like to accomplish the following: Smooth, ...
2
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2answers
96 views

Motor needed for large scale disco ball!

I am working on fabricating a large scale revolving disco ball for an event in Cincinnati. The scale is 10'diameter and the frame is flat bar steel. the exterior is cardboard, duct tape, and adhesive "...
0
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2answers
58 views

Bearings for a contra rotating tubes

Consider a mechanical setup, in which there are two concentric tubes, both to rotate counter to each other ie in a contra rotating fashion. Inner tube runs clockwise, and outer tube runs counter ...
0
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1answer
59 views

What are a few low-cost options for building linkages?

I'm working on a project trying to combine a pantograph linkage with a four-bar linkage. I'd like to build it out of relatively at-hand materials (AKA, nothing requiring a machine shop), and I'd like ...
6
votes
1answer
325 views

What makes crosshead bearings hard to lubricate?

Regarding crosshead bearing failure, I have read that at slow speed it is difficult to establish a lubricating film because there is an imbalance between forces due to combustion and forces due to ...
1
vote
1answer
45 views

Weather Station Gimbal Support

I am currently designing a small weather station that will be suspended from two fiber optic cables and a power wire. You can imagine for now a three point attachment to each wire with a wind vane ...
2
votes
1answer
1k views

How to measure a bearing temperature in a pump?

I found that Resistance Temperature Detectors (RTD) are mostly used for bearings, but it's not easy to drill the casing and we need to take a signal out to PLC and LabVIEW. Is there a sensor that can ...
0
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1answer
57 views

What kind of connection allows rotation at only one end?

We are looking to connect a non spinning coolant pipe to a spinning drill pipe. The connector needs to spin on the end with the drill pipe but be stationary on the end with the coolant pipe. Is there ...
0
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1answer
579 views

How does the SRI “Abacus” rotary transmission work?

I'd like to understand the new SRI "Abacus" transmission, recently reported at http://spectrum.ieee.org/automaton/robotics/robotics-hardware/sri-demonstrates-abacus-rotary-transmission I haven't been ...
0
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2answers
46 views

Terminology for motors with custom bearings [closed]

I am interested in buying electric motor components separately so I can add my own bearings, not use a motor with sealed OEM bearings. I do not know the correct terminology for this type of ...
2
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0answers
213 views

Designing a clamping mechanism for linear sliding stick

the problem I'm prototyping for a musical instrument based on sliding sticks (see https://vimeo.com/170450482) but I'm struggling to make a robust, yet smooth clamping mechanism for the sticks. The ...
0
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1answer
284 views

Quiet Turntable Bearing for 3D Zoetrope

I'm working on building a 3D Zoetrope like the Disney Zoetrope in this video. The part that has me stumped is the bearing. I bought a lazy susan bearing but it's a bit loud, doesn't have any mount ...
3
votes
2answers
593 views

Use of sleeve bearings for linear motion

I am designing a system wherein an assembly has to be moved up and down( 4 inches) at regular intervals ( every 5 mins) using a Linear Actuator. I wanted constrain the DOF and ensure that the entire ...