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Questions tagged [bearings]

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0
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1answer
24 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
votes
1answer
36 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
47 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
61 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
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1answer
56 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
35 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
111 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
votes
1answer
32 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
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1answer
123 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
vote
1answer
33 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
votes
1answer
44 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
122 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
64 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
votes
1answer
78 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 ...
3
votes
2answers
267 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
155 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
30 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 ...
1
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0answers
37 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
114 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
133 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
votes
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
votes
1answer
27 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
198 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 ...
1
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0answers
19 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
42 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
votes
2answers
202 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
94 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
50 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
votes
1answer
56 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
301 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 ...
0
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0answers
122 views

How to connect rotating bar to stationary support

I have a square, weight bearing steel bar, that will rotate. I need to have the weight rest on a stationary support. What kind of connection can I make between them? My research leads to a thrust ...
1
vote
1answer
41 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 ...
3
votes
1answer
972 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
votes
1answer
53 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
votes
1answer
557 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
votes
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
votes
0answers
183 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
votes
1answer
262 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
546 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 ...
6
votes
1answer
216 views

Could linear bearings bear axial load?

With linear bearings, could they be used to join one rod with another to form a cross-junction and rotate with around a 0.3N-mm torque? Suppose the rods are fairly thin, eg, 5mm in diameter. That is, ...
2
votes
1answer
107 views

Using a Teflon bushing as a roller

I have a situation where a 5mm steel rod needs to be in contact and rolls over segments of a 80mm steel pipe's inner face. Would it be a good idea to loosely slip a Teflon bushing over the rod and use ...
5
votes
4answers
267 views

What type of bearing could be used to keep a utensil level while being moved from plate to mouth?

I need a bearing that the inner bore will stay level and balanced when the out ring is rotated. My son with autism lacks the motor function to feed himself with a spoon. He can turn his wrist, when ...
1
vote
1answer
42 views

Evaluating replacement pulley axle strength

Repairs... My garage door has counterweights, and the weight of the door is connected to the counterweights with a steel cable which runs over two pulleys. The original (cast iron) pulleys had needle ...
4
votes
1answer
605 views

How to secure a rotating disc so that it has no wobble

For a 3D printing application, I need to have a spinning disc(that I will rotate via geared stepper motors) that will wobble as little as possible. By wobble, I mean that it will only rotate around it'...
4
votes
1answer
78 views

Are Rolling-Element Bearings Practical for Light Loads?

I have a 5" x 4" x 3/8" plastic panel (wall thickness of 1/8", ribbed). I need to slide the panel over a 12" plastic track that is U-shaped (like a skateboard ramp). This motion could be repeated 2 ...
7
votes
2answers
3k views

How can the wobble of a rotating cantilever shaft be reduced?

I have a cantilever shaft 6inches in length supported on one end using a ball bearing. I am having problems of shaft wobbling in the bearing. I cannot have support on the other end. How can I help ...
10
votes
1answer
359 views

Detailing Fixed Cotton Duck Bridge Bearings

I'm looking for a justification for the use of cotton duck bearing pads without a sole plate. I'm specifically considering their use with precast I-girders. Say I have a two span bridge, simply ...
4
votes
3answers
258 views

Bearing to allow a sphere to roll freely

I want to know what bearings might allow a sphere (5cm diameter) to roll in-place most freely. The closest mechanism that matches what I might want to achieve is a "ball transfer", I believe the term ...
2
votes
0answers
245 views

Plain bearings (plastic) in backlash free joints

I need to design some backlash free rotational joints for slow and intermittent movements (device for human-computer interaction) for my uni project. Possibly loaded in any direction; the loads won't ...
6
votes
2answers
394 views

How to design a narrow bearing that supports shear direction load

I need to connect two flat bars of metal with some kind of bearing that doesn't increase the joint thickness by more than 2-3mm (the less the better), as shown here: There are almost no axial loads ...