What is Pin: Definition and 163 Discussions

A pin is a device used for fastening objects or material together, and can have three sorts of body: a shaft of a rigid inflexible material meant to be inserted in a slot, groove, or hole (as with pivots, hinges, and jigs); a shaft connected to a head and ending in a sharp tip meant to pierce one or more pieces of soft materials like cloth or paper (the straight or push pin); a single strip of a rigid but flexible material (e.g. a wire) whose length has been folded into parallel prongs in such fashion that the middle length of each curves towards the other so that, when anything is inserted between them, they act as a clamp (e.g. the bobby pin), or two strips of a rigid material bound together by a spring at one end so that, when the spring held open, one can insert some material between the prongs at the other end that, the spring allowed to close, then clamp the inserted material. According to their function, pins can be made of metals (e.g. steel, copper, or brass), wood, or plastic.

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  1. U

    Three dimensional collision with bowling ball and pin.

    Homework Statement In order to convert a tough split in bowling, it is necessary to strike the pin a glancing blow as shown in the figure. Assume that the bowling ball, initially traveling at 15.0 m/s, has eight times the mass of a pin and that the pin goes off at 75° from the original...
  2. A

    Dynamics: disc released horizontally, with pin fixed to edge (rotation)

    Hi guys, I am really stumped by this 1st yr Dynamics question, and would appreciate any help on how to approach the question. Homework Statement Homework Equations Torque equations and Force equations Moment of inertia for disc rotating around centre: (mr^2)/2 After using parallel...
  3. K

    [static equilibrium] pin and link support type

    Hello every one I am confused between two support type: the pin, and the link On the textbook, it says, the pin prevents the object from translating vertically and horzontally, therefore, it provides fx and fy reaction forces. but another type of support is much identical to the pin...
  4. H

    Force exerted on bar by pin support

    Homework Statement The 8kg slender bar is released from rest in the horizontal position. When it has fallen 45 degrees, what are the x and y components of force exerted on the bar by the pin support A? Homework Equations F=ma where a= a t_hatt + v^2/p n_hat sin(45)=cos(45)=1/sqrt(2)...
  5. W

    How to Calculate Reactions and Forces in a Pin Jointed Frame?

    Homework Statement [PLAIN]http://img847.imageshack.us/img847/1704/pinjointed.png Calculate the reactions at A and E and the forces in all members. The attempt at a solution At a loss regarding the reactions, tried equating vertical and horizontal. As for the members I guess its just a...
  6. C

    Bend Angle After Bending a Bar Around a Pin

    I think this is the right place to put this. If not I apologize. Feel free to move. I am trying to solve the bend angle for a bar given specific dimensions. The bend angle is acute as in the bar traverses the pin for more than 90-degrees. The bend angle is the angle of the projected lines...
  7. R

    Venturi and a pin hole in a water pipe

    Dear Experts, I was looking at Venturi effect and a question popped into my mind. When I use a water hose and turn on the tap, the water rushes out of the hose. If there is a break along the hose, eg. a small puncture, some water would also leak through this hole am i right? At least this...
  8. J

    Bowling: What's the effect of rotation of the ball has on the pin action?

    Does more rotation of the bowling ball result in faster pin? Here's my understanding, please check my physics. The ball has 2 forms of energy, kinetic due to its momentum and rotational due to its angular momentum. When it hit the pin, there're transfer of energy. The pin will pick up...
  9. F

    How can I accurately calculate the cooling effect of an AGR fuel pin?

    Hello and here is my problematic 1st post. I have a problem which i need help with, I'm an electrical engineer so my understanding on this subject is basic. I need to calculate the cooling effect of a AGR fuel pin and I'm not sure were to start. Here is some background on the question...
  10. P

    What is the purpose of the NO CHIP pin on a 7 segment display?

    7 seg display NO CHIP pin?? hello wise ones. I've recently taken delivery of some 7 segment led displays for a small project, (i'm brand new at building electronic ccts) 3 of theese single digit displays will be driven from a microcontroller the 7 segment display units have a pin labelled...
  11. T

    Earth pin in a standard UK plug.

    Hi friends, simple question here. I have a system that needs to be earthed, currently I am connecting it to an earthing rod which I have outside, however it would be more convenient for me to have the system indoors. Would wiring the Earth connection to the Earth pin in a standard UK plug...
  12. L

    Solving Constant Angular Velocity Homework: Pin Velocity & Acceleration

    Homework Statement Given the above diagram and that the arm R swings at a constant angular velocity theta dot (dtheta/dt), we are to solve for the velocity of the pin and the acceleration of the pin. Homework Equations h= (theta dot)*r^2 dtheta/dt = v v= (theta dot) * dr/dtThe Attempt at a...
  13. L

    Ground 2-Pin Plug: Prevent Electric Shock with TV & Laptop

    I get an electric shock whenever I connect my digital camera or camcorder to my TV. The shock occurs whenever I touch the camera. The TV plug has only 2 pins. So my first thought is to provide a ground return for the TV power. The shock hazard occurs only with the 2 pin plug equipments like...
  14. R

    Calculating the diameter of a pin in double shear

    Homework Statement Calculate the diameter of a meduim carbon steel pin in double shear subjected to a suddenly applied shearing force of 150000N? Homework Equations A=p/t p=300000 ( double shear) t=580 ( ultime shear strength) The Attempt at a Solution Double shear 150000...
  15. bcrowell

    Measuring g with an index card and a pin

    Ca. 1996 a colleague bragged to me about an undergraduate lab he'd worked out where they did a high-precision measurement of g (I think he claimed 3 sig figs) using an index card, a pin, and a stopwatch. He didn't tell me any details. I've long since lost contact with him, but I was thinking...
  16. T

    .Calculating Reaction Forces and Moments for 3 Pin Frame ABCDE

    A 3 pin frame ABCDE is supported at A and E. it supports vertical loads of 60 kN at B 80 kN at c and 100 kN at D as well as a horizontal UDL of 50kNm along DE. Calculate the reaction forces. I have REV = 124 kN and RAV = 116 kN. REH = 115.3kN and RAH = 215.3 kN. Are these correct Next...
  17. I

    Falling rod which is fixed at the pin

    Hi I am trying to solve this problem. I already got the answer but have some questions. A long uniform rod of length L and mass M is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest in a vertical position, as shown in Figure P10.61. At the...
  18. C

    Bowling physics 10 pin bowling

    Bowling physics... 10 pin bowling... I'm an avid bowler... and trying to figure out the reduction in force into the pins when using a 14lb ball as opposed to a 15 lb ball as opposed to a 16 lb ball. I am reasoning that a lighter ball has less impact power (as in getting hit with a 3 lb brick...
  19. M

    What Affects the Forward Voltage Drop of a PIN Diode?

    hii... you all know about IV Characteristic PIN diode.. I fabricate PIN diode and want to analysis my result.. what is the forward voltage drop for PIN diode? are the voltage fix o variable.. ??
  20. M

    Fabricating PIN Diode with Boron, Si and Phosphorus

    Hii... I already fabricated PIN diode using boron (P), Si (N-type), and phosphorus (N). For the method, I etching two contact at Si wafer then doping the boron and phosphorus... there are width I-region (Si) between the contact. A already measured the I-V characteristic of PIN diode but...
  21. P

    Calculate Torque for Pin: L=100.9 cm, M=3.98 kg, m=537 g.

    Torque of a pin. Please Help! Homework Statement How much torque must the pin exert to keep the rod from rotating? (L=100.9 cm, M=3.98 kg, m=537 g.) I attached the picture of the problem. I am unsure how to approach the problem. I am looking through my College Physics and cannot find an...
  22. P

    How Do You Calculate Reactions at a Pin and Roller on an Inclined Beam?

    Determine the reactions at the pin A and at the roller at B of the beam. I honestly have no idea how to do this problem. It gives the answers as... Ax = 192 N Ay = 180 N By = 642 N Please help.
  23. D

    Vertical reactions of pin supports of a weightless Beam with a UDL applied

    Homework Statement The question is: The weightless beam, ABCD, shown in Figure below is supported by a pin support at B, and a roller bearing at C. There is a 4 kN/m UDL along the whole beam, as shown. There is an 11.2kNm clockwise couple at A. The vertical reactions of B and C...
  24. M

    Designing a Stepped Attenuator Using Pin Diode Switches in Microwave Office

    i am designing a stepped attenuator using pin diode as a switch in microwave office. i am having difficulty in using pin diode as a switch. i knw it is operate in forward bias and open in reverse bias. if i am giving a rf signal between 300 Mhz to 3 Ghz then how can i switch it to reverse bias...
  25. X

    How are member forces calculated in a pin jointed truss structure?

    Hello all. I am give a pin jointed truss structure. (Look at attached jpeg image) I have a worked solution of: F2*4 + F1*3-Av*6=0 Av=1/6(3F1+4F2)=600kN Ch=F2=600kN Cv=Av-F1=200kN Member forces: S1=-5/4 Av = -750kN S2=-CH=-600kN S5=3/4 Av=450kN S3=-5/4 s4=250kN...
  26. J

    How Do You Design an RF PIN Diode Switch for High Isolation?

    Hi, This is my first encouter with anything to do with RF design. I'm trying to design an RF PIN diode switch to meet certain specifications. I'm having considerable difficulty putting together a circuit schematic that will accomplish this. My specs are: Center frequency: 15GHz Bandwidth...
  27. Y

    How Do You Calculate the Force Required to Pull Out a Pin?

    Hello, I need help calculating the (Initial and sustained) Force required to pull a round pin that is under load. I have attached a dim diagram showing the system. Please assume no friction since I haven't selected the materials. Also if you could help me calculate the Sheer force (again...
  28. F

    Forces on pin Did the problem but cant check answer

    Homework Statement We are supposed to compute the force supported by pin at A for the slip joint pliers. The book says they are under a 30# grip. I summed forces about A to find B, then broke B up into components by dividing by \sqrt{2} and then I summed forces for Ax and Ay and found A...
  29. I

    How Do You Calculate Forces in a Pin-Jointed Truss?

    Hi all, been here several times and found good help for several questions, but this time I'm out of luck, so here I go. Homework Statement By taking a section through the pin-jointed frame as shown, and considering the quilibrium of the structure to either the left or right of the section...
  30. G

    Stress in a hole due to pin force

    Hi everyone, What is the area should be taken to determine the compression stress of pin-hole in tention force (i.e plate with known thickness having a hole for lifting shakle pin) where the hole diameter is greater than the pin diameter (> x3) (theoretically, it is not an area just line of...
  31. jegues

    Statics (smooth pin reaction + tension)

    Homework Statement See figure. Homework Equations \sum F_{x} = 0 \sum F_{y} = 0 \sum M = 0 The Attempt at a Solution See figure (written in my writing). Are the tensions A and B suppose to be the same? I imagine not because they are at different angles so they have...
  32. J

    Reading Multiple Buttons with one IO Pin

    Hello All, I have been working on this problem for a few hours now and it's really beginning to bug me. I did a search on Google for methods of monitoring multiple push-buttons (tact switches in my case) using a single analog IO pin from a microcontroller. So far, I have come across a few...
  33. A

    What force is the pin exerting on the rod?

    A thin rod of uniform mass M and length L is attached to a string at one end to the ceiling and a pin at the other end to the wall. The rope (connecting the ceiling and the horizontal rod) is cut at t = 0 s. 1) What is the force of the pin at t = 0 seconds? 2) When the rod swings...
  34. L

    Where is the Earth Pin Connected in a Laptop Power Converter?

    I was looking at my laptop power plug - one has a 3 pin and the other is 2 pin. The power coming into the laptop has only 2 connections - GND and +DC If I remember rectifiers, we only used the AC mains to convert AC to DC, not the earth. I am wondering, where is the the Earth pin connected...
  35. S

    Possible Combinations | ATM Pin

    Homework Statement To gain access to his account, a customer using an automatic teller machine (ATM) must enter a four digit code. If repetition of the same four digit is not allowed (for example, 1111), how many possible combinations are there? The Attempt at a Solution I figured two...
  36. R

    Understanding PIN Photodetector Bandwidth for Vibration Sensing

    I'm trying to design a fiber optic sensor to sense vibration via intensity modulation. I'm new in this field and i don't know whether I can use a PIN photodetector for low frequency or not... what's the bandwidth of a PIN Photodetector? Does it mean its responsivity is limited in low frequency...
  37. J

    10 Pin Dual 7 Segment Display cant find documentation

    Hey Guys, So I was scrapping parts from an ancient present I found up in the attic called the "Singing Machine". Point is I managed to retrieve a dual 7 segment display. The only documentation I can find online is for 14 pin versions of these things. Strangely this only has 10 pins and I can...
  38. I

    Help with 7536A-1 and a 8 pin IC with no numbers

    I am trying to replace some pieces in a circuit that produces police siren sounds and can't find new ones. one i believe is a transistor with the numbers 7536a-1 and an 8 pin IC with no numbers on it. Can someone please help me identify these. I am new to electronics and not real familiar...
  39. S

    Analyzing the Motion of Pin P in a Parabolic Slot

    Homework Statement A guide with a vertical slot is given a horizontal motion of x=200cos(0.3t), where x is in mm, t is in seconds and (0.3t) in radians. The guide controls the motion of pin P, which is also constrained to move along a fixed parabolic slot as shown below. The parabolic slot has...
  40. C

    Calculating Friction in Pin Joints for Linkages | Homework Help

    Homework Statement I'm trying to determine the friction of a pin joint that will be loaded differently depending on the position of the linkage. Homework Equations I know the equation for frictional force is F="mu"*N, where "mu" is either the coefficient of static or kinetic friction...
  41. K

    Max Magnitude P for Pin Shear Stress < 80 MPa

    Homework Statement The beam is supported by a pin at A and a short link BC, as shown in Figure 3.0. Determine the maximum magnitude P of the loads the beam will support if the average shear stress in each pin is not to exceed 80 MPa. The diameter for each of the pins is 18 mm. The Attempt...
  42. P

    LM317 LDO pin compat replacement for CC op?

    Hi. I use an LM317 in constant current mode to vary the current from ~20ma to ~400ma, the voltage use is about 3 to 5. I just don't like that there's a 3 volt drop out for the 317 design. I'm wondering if anyone knows of any pin compatible replacements with a lower drop out? I wouldn't mind...
  43. C

    Reaction forces at pin joint on a frame

    Homework Statement Basically, I am looking to find the reaction forces at the pin joint on the right side of the structure. I just realized it is not labeled on my diagram, but it is the pin on the link opposite of E. Where the 13 degree angle is measured from. Homework Equations I have...
  44. N

    How much torque must the pin exert to keep the rod from rotating?

    Homework Statement How much torque must the pin exert to keep the rod from rotating? (L=1.011m , M=3kg , m = .301kg) So I am guessing the point of rotation is the pin?? But then how does the pin exert any torque if it is at the point of rotation? I'm not quite sure there is a...
  45. E

    What Are the Pin Assignments for the TLC0820AC ADC?

    Hello, I am building my senior design project and need some help with the pin assignments for the 8-bit ADC --TLC0820AC (TI instruments). I've taken a look at the data sheet. Which has helped out some. http://focus.ti.com/lit/ds/symlink/tlc0820a.pdf The pins that I'm troubled with are the...
  46. J

    Calculating Electrons in Silver Pin: 10g Mass, 47 e-/atom

    Homework Statement (a). Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b). Imagine adding electrons to the pin until the negative charge has the very large value of...
  47. A

    Why is earth pin longer than other two in a plug top?

    Why is Earth pin longer than other two in a plug top?
  48. M

    Mechanical Engineering - Pin joint Framework problem

    Homework Statement A framework of pin jointed members has to be designed to support a plug introduced into the reservoir wall to prevent leakage and further progression of a crack along the wall. The plug is cylindrical, has a diameter of 0.35 m and is supported by a single pin joint. The...
  49. U

    Depletion depth in a PIN diode

    Hi guys, I'm trying to find a reliable formula for calculating the depletion depth in a PIN diode at a given voltage and knowing the doping of the layers. Does anyone have one? Formulae for the PN diode are common, but don't apply to the PIN directly as far as I can see. I found a formula...
  50. Q

    Solve Pin Jointed Frame Q1: Evaluate Reactions, Calculate Forces

    Hey Guys, I've got a pretty simple (I think) pin joint frame question. I am pretty weak in this area of mechanics so if someone could advise me on how to go about doing this question i would really appreciate it. The Figure Q1 (The Attatchment) shows a pin jointed frame. The frame is...
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