# What is Automatic: Definition and 99 Discussions

An automatic rifle is a type of autoloading rifle that is capable of fully automatic fire. Automatic rifles are select-fire weapons that are capable of firing in semi-automatic and automatic firing modes (some automatic rifles are capable of burst-fire as well). Automatic rifles are distinguished from semi-automatic rifles in their ability to fire more than one shot in succession once the trigger is pulled. Most automatic rifles are further subcategorized as battle rifles or assault rifles.

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1. ### Auto/Motor Building an Automatic A0 Paper Folding Machine: Tips and Tricks

I want to make an automatic A0 folding machine that I can use myself. But I couldn't find the mechanism in the videos I watched, I want to get your opinions.
2. ### Comp Sci Automatic Market Research Program

I was given an Excel that contains a list of products, my teacher would like us to scrap through the website hktvmall.com to find respective similar products and list out their prices and description. FYI:
3. ### Automatic Window Opener - how does it work?

Hi friends I'm working in a community center repair workshop once a week. One of our customers brought us an automatic window opener used for a greenhouse, and we were not able to find out how this contraption really works - but it does work, by using solar energy only. It consists of a hollow...
4. ### Automatic parking slots detection using Python

TL;DR Summary: How to automatically detect the parking slots using Python? I have a Deep Machine Learning course and would like to do my course project about "Available Parking Slots Detection using Deep Machine Learning Based on Image Processing". My plan is to split the project into two...
5. ### How Secure is an Automatic Hair Comb in Your Pocket?

Hey guys! I've got an OTF comb (a.k.a. "out the front," where the plastic hair comb "blade" ejects straight out from the handle) that is held in the closed position with 1 lb, 12 ounces of magnetic force. I.e, upon measuring it takes 1 lb, 12 oz. of finger pressure against the comb switch to...
6. ### How good are automatic watch winding mechanisms?

I have been looking at 'Horology' forums but they all seem to be more about buying watches and less about the way they work and about mending them. (Money money money). I sort of hoped that good old PF might have some ideas about my problem. When I was 21, my parents bought me an Omega...
7. ### Automatic TV attenuation with thumb drive....Possible?

Greetings from Tennessee. I am not an EE but I like to tinker. So you are watching TV and the commercial comes and all of a sudden you are getting blasted out of your recliner. Also when I'm watching Andy Griffith on Amazon prime? Everything is going along fine and then they play some music and...
8. ### Automatic Tire Chains - Onspot's Efficient Idea

Interesting idea. I wonder how efficient it is. It's from a company called Onspot.

19. ### Python More cool automatic differentiation (Hamiltonian)

Well I think it is cool anyhow ;) Here is a dependency-free variable-order double pendulum simulation in about 120 lines of Python. Have you seen the equations of motion for this system? As usual, this is based on code that I have provided here, but trimmed for maximum impact. Can you see...
20. ### How to Detect (possible) Automatic Renewal Scam?

Hi, I am being charged yet again for an account I had closed two years ago. My customer dashboard was set to "Automatic Renewal" , which I believe I had disabled. I have now disabled this Automatic Renewal and I took a screenshot of it . QUESTION: Were the settings in the dashboard to be...
21. ### A fascinating fault with my automatic soap dispenser

I have a Dettol automatic soap dispenser (see fig. 1) which uses a little propellor-type pump to let out a small amount of soap when you put your hand in front of the passive IR sensor. It's been working fine until just before, when I turned the lights off in the kitchen (night time, so...
22. ### Delete automatic updates ... problem?

Windows 10 automatically updated my computer day before yesterday, and yesterday I woke up to find all my files missing. It took me a while, but I recovered all my files. However, now there are several important functions that either do not work, or are missing altogether. :H So, my main...
23. ### Python Need an automatic way to move files between computers

I have a system of 3 PCs all connected to the same router, I need some way to automatically move files from two PCs to the third, how do I even begin to approach this?
24. ### Automotive Why does automatic emergency braking not work in all speeds?

Adaptive/active/radar cruise control (Update: It is not adaptive cruise control. It is automatic emergency braking) works only at or below 50 miles (per hour) in some high end cars like range rover, and even below that in other cars. Does anyone know why?Thanks a lot
25. ### How to choose automatic voltage levels from a battery

Hi.. I have a 40 volt (2.5Ah) , Lithium Ion battery. I need to use this battery for 20V application as well as 40V application. How to make an automatic voltage level chooser module for respective application?
26. ### Automotive Engine Torque Control to Automatics & DCTs

Hi guys, I have a question about engine torque control in automatic transmissions and dual clutch transmissions. I've seen cases where the engine torque is decreased on an up-shift and increased during a downshift. Why is this done?
27. ### Automatic Window Lift: Get Help Setting Up Low-Cost, Efficient System

Hello all! I'm an electrical/controls engineer by day and farmer by night. I need some insight on an issue I'm having at the farm. We have a greenhouse where I've setup automatic temperature controls. A small PLC reads temperature in the greenhouse. If the temperature gets too high, we open...
28. ### Advice for the design of an automatic door opener

Hello all, I need to design an automated trap door opener incorporating a motor and at least one of the following: gears, springs, or power screws. It is 36 inches wide and 48 inches long. It is hinged along its width. The door weighs 60 pounds. When closed it is flush with the floor. It must...
29. ### Is a Lid Stay Suitable for Lifting a 10 kg Part at a 45 Degree Angle?

Hello, We are working on a mechanism to open an application.And we were thinking to use a LID STAY but we are not sure if this item is suitable for the movement that we need to obtain. The application requires lifting a 10 kg part. The part is connected to one end of a horizontal lever. When...
30. ### Automatic Load Frequency Control in a power system

I am studying ALFC and I have a few questions about it. Consider the flyball governor in this system. It senses the changes in speed of the turbine. If load is increased, the balls will slow down and will move inwards, moving point B upwards. Now, this will open some additional valves to allow...
31. ### B Calculator automatic rounding is screwing up my calculation.

Hi, When I type into my calculator 13.6/(1.000000001) the calculator returns the answer 13.59999999 Then, when I type 13.6/(1.0000000001) the calculator returns the answer 13.6. Obviously, both 13.6/(1.0000000001) and 13.6/1 cannot equal 13.6, so what's the deal with the calculator...
32. ### Design a automatic locking mechanism for two concentric cylinders

How much force required to pull the actuator pin from the solid cylinder Weight of the solid cylinder is 15kg And angle of inclination 30 , Coefficient of friction 1.5
33. ### Automatic hydraulic jack -- choosing motor

What type of motor can I use for this jack ? It's running from a 12V battery
34. ### Automatic diving watch problem

I wondered, If I have an automatic diving watch that is designed to withstand, say 20 atmospheres of water pressure, is it safe to swim with it? When you dive, you do not hit the water as hard and with so many repetitions as you do while swimming. Do you think it is safe for the automatic...
35. ### Automotive Automatic brake applying system

Hi fellas! I need to develop a system for a self driving car which involves automatically presses brake,clutch and accelerator when required.I am planning to use a servo for this purpose and have some trouble identifying the torque requirements! How much torque do i need?assume the lever...
36. ### MATLAB MATLAB how to automatically read a number of files

I would like to plot a number of 3D graphs from different data files. For example I am using fid = fopen('SS 1.dat','r'); to read the first file and then plot a graph. How to set the program to change the name to 'SS 2.dat' automatically? Also for the tenth file the name becomes 'SS 10.dat'...
37. ### Expandable Gear CVT: Michael Warren Reed's Project

Hi there, I started working on an idea for an expandable gear CVT about 3 years ago, while out of work for a few months. I had some exciting progress on an idea that I think might be worth pursuing more, but I now have 2 kids, 2 jobs, and no time. I have brought up the project idea with a few...
38. ### Can a Toy Helicopter Be Programmed for Automatic Hovering?

Heya everybody, I am trying to write a code that will make a toy helicopter to hover. I have cameras that are constantly tracking it, reporting at real time about it's position and angles. I have control on the yaw (Z axis rotatio), pitch (forward/backward movement), and rotors speed. I have...
39. ### Automatic electrical switch to between two paths

I need a switch that will alternate the flow of electrical current between two diverging wires at a decided rate. Are there switches that function this way? What are they called?
40. ### Need Help Designing Mechanism for Automatic Spring Return

I'm trying to design an entirely mechanical system for returning an extension spring to its extended state, without the assistance of electronics, pneumatics, hydraulics or any other form of auxiliary power. It's for a soft exosuit concept that simply enhances the speed and ease of walking or...
41. ### How Can a Sensor Accurately Control Inflation to 2 PSI?

Hello all, I am trying to design a system with a sensor that can detect when an inflatable is inflated to 2 PSI. I am trying to inflate something small, around 6 liters. I currently have a system that uses a solenoid, the compressed air, and a mechanical timed relay that tells the system when...
42. ### Creating an Automatic Fish Feeder Without Jamming

I'm making an automatic fish feeder. It uses a very low torque, low RPM, low energy motor to turn a paddle wheel. The paddle wheel pushes the food off a ledge and into the tank. I plan to make the paddle wheel using a gear. I also have access to a 3d printer to make the part. The motor is...
43. ### Automatic sorting with barcode identification inside a refrigerator

I'm endeavoring to prototype a challenging sorting mechanism inside a fridge and would appreciate any tips on how to get from the specs to a plausible design. #Problem The aim of the game is to identify and sort food items in the limited space of a fridge - such that a user would push...
44. ### How to turn off windows automatic update

This is part of Microsoft's generally charming ways; I like it when I'm unable to turn my computer off because there's a Windows update that must be installed _right there and then_ . It's charming,specially when you're in a hurry ,need to stop your computer work and go somewhere else, or if...
45. ### Hydraulic Jack, Automatic 12 volt DC - College Project

Hello Frnds, I am presenting my engineering final year project. It is a 12 volt DC hydraulic jack. This jack is made to lift light motor vehicles and light commercial vehicles. Its capacity can be increased by changing some parameters. The project consists of a 12 volt DC...
46. ### Automatic rail system vfd type vs torque

Working on a problem with an automatic rail system used to transport cows. This rail system carries a substantail amount of weight so starting torque is the issue coupled with washdown ( rust) issues. The system runs well normally even fully loaded. However has nuisance over amps on startup...
47. ### Mysterious Automatic Wake-Up on Old PC

Hello. I'll try to describe a strange phenomenon I look on a PC. My recent PC is temporarily out of order and sent to repair. So I use my old PC ( 300 MHz Win-2000 ) and what happens ... Although I correctly stop this PC in the evening, during the night it starts alone without any human...
48. ### Automatic gear changing system

if we keep a spring attached to a trolley on moving vehicle we find the force by f=kx and the potential energy by 1/2kx^2. thus we calculate the friction, the slope of the road and device an system to automatically change gear.we already know the petrol consumed, speed and acceleration and...
49. ### Automatic pattern recognition and data modeling

I can't help but think that some day, someone will figure out a way to get a computer to recognize patterns in a given set of data, and fit an equation, if there is any, to that set. Such a system could be used in areas like forecasting stocks, weather, and sales, or even in air traffic...
50. ### Fortran Automatic array allocation in Fortran 95?

The following code seems to run ok under fortran 95 (g95 compiler), but I was unsure about the exact nature of the array assignment. As you can see it is a variable sized array, without any explicit "allocate" command. The code works even when the array size could not be known at compile time...