Connecting The Shafts To get Transmission Of Energy: Couplings

What is it?
Coupling is a device that connects two shafts together at their ends with the purpose of transmitting power. They normally do not allow disconnection of shafts during operation, however there is torque limiting them which can slip or disconnect when some torque limit is exceeded.

To join two pieces of rotating devices while permitting some degree of misalignment or end movement or both is the couplings primary purpose. By careful selection, servicing and of installation them, substantial savings can be made in reduced maintenance costs and downtime.

What is gear coupling?
It is a mechanical device for transmitting torque between two shafts that are not collinear. It consists of a flexible joint fixed to each shaft. The two joints are connected by a third shaft, called the spindle.

Each joint consists of a 1:1 gear ratio internal/external gear pair. The tooth flanks and outer diameter of the external gear are crowned to allow for angular displacement between the two gears. Mechanically, the gears are equivalent to rotating splines with modified profiles. They are called gears because of the relatively big size of the teet possess higher torque densities than common joints designed to fit a given space while common joints induce lower vibrations. The limit on torque density in common joints is due to the limited cross sections of the cross and yoke. The gear teeth in a gear coupling have high backlash to allow for angular misalignment. The excess backlash can contribute to vibration.

Gear couplings are generally limited to angular misalignment, we.e., the angle of the spindle relative to the axes of the connected shafts, of 4-5°. Universal joints are capable of higher misalignment.

Single joint gear couplings are also used to connect two nominally coaxial shafts. In this software the device is called a gear-type or flexible coupling. The single joint allows for small misalignment such as installation errors and modifications in shaft alignment due to operating conditions. These types of gear couplings are limited to angular misalignment of 1/4-1/2° generally. Check – Cardan Shaft Manufacturers.

It is generally observed that even with the most exacting precision in the original installation, subsequent misalignment can rarely be avoided over a period of time, foundations may settle, bearings ultimately wear and measurements change with heat range.

The misalignment also takes place due to vibrations. These Flexible Gear couplings are available in two configurations – Full Geared and Half Geared Half Rigid.

Full Geared Coupling: Here both the halves are identical and consist of two Hubs and two outer Flanges Sleeves bolted collectively. This type of Coupling is capable of accommodating both Offset as well as Angular misalignment.

Half Geared Half Rigid Coupling: Here instead of two identical halves one half is geared and the other half is rigid. There exists a single Hub in this type since the other aspect is rigid. This type is used for taking care and attention of only Angular misalignment.

How To Track A Lost Phone

What must you do immediately?

Once you find the phone is missing, do not panic. If you find your mobile missing for just a short span of time, there are greater chances that you get back your mobile. After relaxing yourself for few seconds, call your mobile phone from your friend’s cell phone and check out if you are able to find it. There are chances that you could have placed it somewhere and forgotten it. There are several applications that can be installed to track the stolen phone. We shall discuss the features of those applications and measures that can be taken to keep your device safe.

Change passwords

As your mobile is for your personal use, there are chances that you have your bank account or social networking sites to be accessible. The immediate step that has to be taken is to change the passwords for everything that you believe can be reached from your mobile. If you have applications installed in your phone, then activate them by going online. You will have provisions to lock your data or back up your information or at times if you feel they are very confidential, you can also delete them.

Block your card

The second important step that has to be taken is to call your service provider from the cell phone of your friend and block your card as there would be a lot of phone numbers available in it. Once you block your card, file FIR in the police for your lost card. If you do not have your invoice with you, go to the retailer where you purchased the mobile and get the duplicate copy and photocopy it and submit it to the police station. Note the IMEI number from the invoice and update it any database of lost mobiles. On buying second hand mobiles, people are likely to check these databases, if the phone is a stolen one.

Applications that help you track your phone

‘Lookout’ is a well-known app for tracking your lost phone. It has a feature to turn on your front camera and take a snap of the person using it. You can trigger that option from your laptop. The photo will be sent to your mail immediately when the internet is turned on. This app generally sends mail from front camera, every time the lock code is used wrong for five continuous times. For iPhones, there is an application ‘Find My iPhone’ exclusively for this model of mobiles. When you log into your iCloud account, you will have permission to delete all your mobile data and also trigger a sound alarm from the phone. You can trace the location of your mobile and also use this app to send message to the person holding it. There are other applications like bull guard and F-secure which have features that help you track the phone. Bull Guard provides space in its server that helps you to back up the data.

Safety measures to be taken when you use phone

It is always advisable to have these kinds of applications installed in your mobile, though you keep your mobile always safe. After you purchase the cell phone, keep the invoice and warranty card very safe. Insure the mobile when you buy it, as there is a theft insurance which allows you to get back money for your lost mobile. It is always advisable to have a same position for your cell phone and always take care that you place your mobile only there.