What is Belt: Definition and 230 Discussions

A belt is a loop of flexible material used to link two or more rotating shafts mechanically, most often parallel. Belts may be used as a source of motion, to transmit power efficiently or to track relative movement. Belts are looped over pulleys and may have a twist between the pulleys, and the shafts need not be parallel.
In a two pulley system, the belt can either drive the pulleys normally in one direction (the same if on parallel shafts), or the belt may be crossed, so that the direction of the driven shaft is reversed (the opposite direction to the driver if on parallel shafts). As a source of motion, a conveyor belt is one application where the belt is adapted to carry a load continuously between two points. The belt drive can also be used to change the speed of rotation, either up or down, by using different sized pulleys.

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  1. H

    Does tension in a belt drive system affect torque requirements?

    HiI would like to know, does the torque required to turn a pulley increases if you increase the tension? I have a system like this:pulley motor pulley car and a belt goes...
  2. H

    Advantage of using a bigger pulley in belt drive?

    Hi : lets examine the following scenario 1. M --------- o where M is a mass, o is a pulley with it's outter radius r attached to a mass by the belt drive -------. frictionless. 2. M ---------O same setup but the radius is now bigger, R. I was reading...
  3. dlgoff

    My daughter's 4th Dan Black Belt test

    I returned home yesterday from North Carolina and wanted to give an update via some pics. In the motel the evening before her test. https://imagizer.imageshack.us/v2/393x295q90/r/526/img0194hi.jpg Doing a little tune-up at the Masters dojo the morning before the test...
  4. K

    How to understand tension force existing in slack side of belt drive?

    Hi, For a long time, it is always unclear for me to understand that there is a tension force acting in the slack side of a belt drive. Tension acting in the tight side is quite straight forward and hence no doubt! When I see a belt drive in motion, I always see the slack side kind of...
  5. H

    Calculating Motor Torque for a Rigid Belt Drive System with a Load in the Middle

    Ok. Say you have a belt drive system that is run by a motor at one end. You have a load F located somewhere in the middle of the belt and the belt does not deflect (it is rigid). How would I determine the torque required by the motor to move this load F? Thanks in advance!
  6. Mordred

    Third Van Allen Belt Discovered - NASA Probes

    http://www.washingtonpost.com/national/health-science/van-allen-probes-spy-third-band-of-radiation-before-it-disappears/2013/02/28/19c7a66c-81c9-11e2-b99e-6baf4ebe42df_story.html Found this interesting article.
  7. H

    Belt Conveyor Problem: Finding Length and Weight | Grain Density 700 kg/m^3

    hey ... i need help with this problem Grain density=700 kg/m^3 velocity of belt=1.3 m/sec tan(theta)=tan(30)=0.6 hight=5m wide of belt = 50cm find: 1- real Length 2- conveing wight look at pic http://hh7.an3m1.com/Sep/an3m1.com_13608577291.png My answer : 1- sin(30)= 5\L L= 10 * 2.5= 25m...
  8. G

    Belt pull on v-belt mower deck

    Hi, I'm trying to find the belt pull on a mower deck. The deck consist of 3 spindles and a spring loaded back idler with one v-belt. The engine driving the spindles is a 20 HP twin cylinder engine operating at 3600RPM. Main drive spindle is 3600 rpm (1:1 ratio) Engine manual says max...
  9. E

    Help with correct diameter for a timing belt project

    Hello, I'm building some equipment that has a drum driven by a timing belt. The drum is roughly 11.25" in diameter. The drive belt used is H pitch - 1/2" spacing between the teeth. For the gear teeth on the drum I'm using another belt of the same pitch, inverted and epoxied onto the drum. The...
  10. H

    What Are the Benefits of Using Regenerative Conveyor Systems in Mining Projects?

    hey >>>> i have tow Questions about conveyor design: What are the Variables influencing the design of conveyor ? all i know is : Angle of surcharge
  11. N

    Solar Constant for Kuiper belt

    what is the value for our solar constant?
  12. M

    Solving Conveyor Belt Stress for Beginners: A Step-by-Step Guide

    Homework Statement I am pretty confused with how to go about answering this question: Calculate the maximum lenth of conveyor which can be used to avoid the belt failing from stress, for an installation carrying 140 t/h up a gradient of 10 degrees, if the belt width is 1.1m, the speed is 1.7...
  13. P

    Liquid flow over a conveyor belt

    1. A conveyor belt with one end immersed in a glycerin tank is used to transport small amounts of glycerin to a second tank. The belt surface is completely smooth, flow is laminar, and the specific weight of the fluid is 60 lbf/ft^3 with the belt velocity equal to 1 ft/s. Determine the volume...
  14. A

    Seat belt force mismatch between test data and calculations

    Hello! I have a question about seat belt force. In a 55km/h collision maximum chest acceleration is 60 g, and if say torso weighs say 40kg, then max force should be 600 m/s^2 * 40kg, which equals a lot, but if you look at test data of seat belt force it is only 8KN which is strange, compared to...
  15. S

    Does adding an extra bolt distribute seat belt forces evenly?

    Hi all, I'm having an online discussion and curious to know about the forces a 3-point seat belt has on a car. One guy is fitting this retractable belt to his car. The retractor and anchor mount at one bolt hole, the anchor is off centre, it attaches via a steel extension piece, the section...
  16. M

    2D kinematics - conveyer belt question

    Homework Statement Sand moves without slipping at 6.0m/s down a conveyer belt that is tilted 15°. The sand enters a pipe 3.0m below the end of the conveyer belt. What is the horizontal distance between the conveyer belt and the pipe? Not sure where to start.
  17. M

    Converting belt tension to radial compression force

    Imagine you are getting dressed in the morning and fastening a belt around your waste. You pull on the loose end of the belt, developing tension T throughout the length of the belt. Using this information, how can you determine the amount of compression the belt is applying to your waste? I...
  18. S

    Force required to overcome conveyor PLI belt tension?

    Force required to overcome conveyor PLI belt tension? I'm designing a conveyor. A very large one i might add. The conveyor has 3 rolls, one driven and 2 idlers. (kind of shaped like a right triangle) There is of course a belt (103.5" wide) tensioned at 15PLI. So I know that there are 1552.5lbs...
  19. F

    Belt Drive Pulley: Mean Diameter 300mm, Angle 180°, 920 RPM

    Homework Statement A belt drive pulley has a mean diameter of 300mm, an angle of contact of 180° and rotates at 920 rpm. Smaller belt tension is 50 N and coefficient of friction is 0.3 Neglect centrifugal Homework Equations V=piND The Attempt at a Solution pi*(920/60)*0.3=14.45 ms...
  20. T

    Acme leadscrew vs timing belt getting really high numbers

    Hey all, I'm on summer break so my engineering brain is almost completely turned off. So I would not be surprised if I am making some kind of silly error. I'm trying to compare different methods of linear positioning for a CNC project. ------------------------- Part 1 OK, so here's the...
  21. M

    Estimating torque conveyor belt

    Hi all, was wondering could anyone give me a hand with this calculation. So basically I want to estimate the torque required to turn a conveyor belt. I have drawn a diagram of what it looks like. I know the weight of the objects on the belt and their respective friction coefficients. Also the...
  22. S

    How to Calculate Load on Idler in Belt Friction System?

    I've done part a) and b) but I have no idea where to even begin with part c) on figuring out the loading on the idler!
  23. W

    What is the larmor radius of an electron in the inner van allen belt?

    Homework Statement What is the larmor radius of an electron in the inner van allen belt? This is for a General Astr class so I feel like I must be over complicating it. Electron Kinetic Energy in the inner VA belt: K≥30 [MeV] (much greater then its rest energy) VA Belt Radius: r~1.1-2.0...
  24. A

    Belt drives - frictional torgue, can anyone help please

    Homework Statement I have question in my assignemnt which i have no clue what to answer Discuss the effect of lap angle on the frictional torque that can be transmitted, for both the flat and the vee belt. Homework Equations Lap Angle (degrees) 60 90 120 150 180 Lap angle...
  25. H

    Nuclear Stability Belt: Why Mass No. 20+ Deviates from Y=X

    As we all know, the nuclear stability graph strays away from the y=x line from mass no. = 20 onwards. Why is that?
  26. Z

    Belt and Suspenders thread - what safety upgrades should older BWRs get?

    I'll start it off with a nice idea I found in another forum: http://www.energyfromthorium.com/forum/viewtopic.php?f=51&t=3433 Solar panels on the roof to keep battery banks for instrumentation and valves charged. Lovely and relatively inexpensive, might avoid the need for bigger battery...
  27. S

    Dropping sand onto a conveyor belt

    Homework Statement Sand is placed onto a horizontal conveyor belt. rate of sand placed = 0.5 kg s-1 velocity of conveyor belt = 2 m s-1 a) what is the power supplied by the system to keep the velocity constant? b) what is the rate of change of KE by the sand c) why is the answer in a and b...
  28. E

    Valles Marineras Origin and Origin of Asteroid Belt Linked?

    The aerial view of Valles Marineras has a strangely familiar look to it. As a kid I would shoot BB's at all sort of fruit and mud and stuff. Sometimes I'd hit a rotten apple or tomatoe with a glancing shot that would rip open a gaping tear for a distance as the BB would enter, force material out...
  29. M

    Minimum Turns for Equilibrium: Rope Winding on Cylinder with Belt Friction

    Homework Statement find the minimum number of turns the rope should be wound around the cylinder to maintain equilibrium of the weights the coefficient of friction is 0.20 and the mass1= 80kg and mass2-2kg.
  30. M

    Simple circuit to drive a small/medium conveyor belt for 5 seconds

    I am a hobbyist, and I am not too familiar on to how to run motors. Can someone help me design a simple circuit that drives a dc motor on pulley drive of a conveyor belt. The conveyor belt has to stay on for 5 seconds after a switch is turned on. The belt is about 48 inches long, the radius of...
  31. E

    Viewing the Sun and Planets from the Asteroid Belt

    At a distance of 2-4 AUs, (in the asteroid belt), would you be able to stare directly at the sun? What about the rest of the view from this distance? Other planets, if at all visible, would just be tiny specks, like they are when viewed from earth? Would Jupiter appear larger by any noticeable...
  32. I

    Solving a Belt and Pulley Question Using Simple Equations

    Hi guys, I am working on a simple belt and pulley question, as pictured below. To find the magnitude, I used the following equation: (g(M-m))/(M+m) So, 9.81(2500-600)/(2500+600) = 6.01 - Answer = 6kN Is this correct, or am I doing it totally wrong? I have searched for the...
  33. H

    Force of seat belt on person in when car collides into a piston

    A car moving at 20 m/s runs into a piston that compresses air in a cylinder and stops the car at 0.3m. The 70kg person stops in the same distance because of the seat belt. Determine the average force of the seat belt on person during the stop and what assumptions did you make? ~we just...
  34. J

    Unveiling the Belt Paradox: Exploring Interferometrics Cart Phenomenon

    Interferometrics Cart Imagine that a cart is mounted with two electric motors, connected each to a pulley. Between the pulleys is installed a belt of equidistant holes that always coincide at the same points in relation to the cart. This allows the passage of luminous flux. Like a...
  35. D

    Discharging a capacitor - the Van Allen radiation belt

    I've seen inner and outer Van Allen belt drawings that have the inner belt consisting of protons and the outer belt consisting of electrons. I am guessing this is due to differences in the mass density or the charge density differences of the two. So we have charge separation in the Van...
  36. S

    Calculate the coefficient of friction between crates and a conveyor belt

    Homework Statement Hi can anyone help me calculate the coefficient of friction between crates and a conveyor belt. The crate is moving up a 25O angle at a constant speed to a height of 12m. Homework Equations CoF=F/R The Attempt at a Solution I don't know if this is a trick...
  37. D

    What is the Iron Mass in the Main Asteroid Belt?

    I'm trying to find how much iron (by mass) is in the main asteroid belt. I'm finding a lot of sites that say 10% of the asteroids are M class, but is that by number or by mass? Does anyone know, and can you provide a reference?
  38. N

    Mars Conveyor Belt: Time Delay?

    Consider a very long conveyor belt from Earth to Mars. If we turned on the conveyor belt from Earth, would its opposing end instantly move on Mars? Or would the timing be slowed somehow from relativity? Thanks
  39. O

    Belt friction between two pulleys.

    Homework Statement http://imageshack.us/m/135/2262/beltz.jpg I do no understand as shown in the above picture why T1 = 1 to make e^u0 = e^-u0, could anyone offer an explanation as to why this is the case? Thanks Homework Equations All above The Attempt at a Solution
  40. M

    How can you use a belt transect to record changes in species distribution?

    I need to study the measurement of population size of density. However, I can't find information on this that is understandable. Has anyone got any ideas? The Attempt at a Solution I already know they consist of a line with black marks to indicate something
  41. D

    Does a Seat Belt Increase Risk of Injury in a Car Crash?

    I'm doing a project for physics involving crashing cars into walls and recording the forces generated... I've heard that a seat belt actually causes most deaths in the instance of a crash... is this true? Thanks, "Practice is necessary to improve an athlete’s performance without it, the...
  42. M

    Calculate Power Needed to Run Conveyor Belt with dm/dt kgs-1

    sand is pouring on a conveyor belt in a rate of rate of dm/dt kgs-1 if the velocity of the conveyor belt is v ms-1, what is the power needed to run the conveyor belt. My friend arrived at his answer in this way F = dp/dt = d(mv)/dt = v (dm/dt) N Power = Fv = (dm/dt)v2 Watts...
  43. R

    Automotive Efficient Automotive Timing Belt for Low Speed Applications

    I am choosing a timing belt for a 60kw continuous system at roughly 1100rpm. This is a relatively low speed application. After using the belt selection programs written by Gates, Emerson and Goodyear, they all seem to point towards quite hefty installations with large pulley diameters and...
  44. R

    Coupling DC Motors with Timing Belt: Vibration Concerns?

    Just a short question. As part of a dyno project, I am coupling two dc motors together with a timing belt. To allow the same rig to be used for different test motors, I am considering mounting this (test) motor on a table, which can be positioned in two directions on leadscrews. This would...
  45. P

    Calculating Orbit Time of a Hypothetical Planet in the Asteroid Belt

    Just looking for a place to start, not all the work. Homework Statement 3 The asteroid belt between Mars and Jupiter consists of many fragments (which some space scientists think came from a planet that once orbited the Sun but was destroyed). (a) If the radius of the asteroid belt (where...
  46. R

    Using a timing belt for a Dynamometer

    Hello, I was wondering if someone could help me understand this situation. I am designing a motor/generator dynamometer, which is to be arranged as shown in the attached picture. There is a fixed high power DC motor transmitting power via a Syncronous / Timing belt to a motor which is...
  47. U

    Mechanic of Machine - belt drive system

    Mechanic of Machine -- belt drive system Homework Statement An induction motor shaft, runnnig at 1200 rpm, drives a workshop main shaft by a flat belt drive. the diamter of the pulley on the motor shaft is 40cm n the main shaft is 70cm. another pully of diameter 45cm drives a countershaft...
  48. U

    Troubleshooting Gear Pitch and Belt Compatibility for a Stepper Motor

    Hello all! I am usually lurking and posting around the EE side of physics forums, but I have a project that deals with a little bit of mechanical stuff (please move this thread if I'm in the wrong place), and the mechanical aspect of engineering certainly isn't my forte. To be as superficial...
  49. B

    Navigation through the Asteroid belt

    How do scientists ensure that probes traveling beyond Mars avoid the asteroid belt? How are calculations made regarding the probe's journey through the asteroid belt to ensure that they are not hit by one?!
  50. onomatomanic

    Third (equatorial) desert belt during Mesozoic era?

    Hi board, I've just been reading up on the basics of meteorology, and http://en.wikipedia.org/wiki/Atmospheric_circulation" this claim: Unfortunately, no further information or references are provided, and the only google hits for "third desert belt" point right back to the article. I...
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