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How-to-do-it guide to eliminating machine vibrations
One
of the most common causes of severe machinery vibration is the
misalignment of drive shafts and other components. Machinery Vibration:
Alignment, by Victor Wowk, gives you a practical resource for aligning
shafts, bearings, gears, pulleys and a wide variety of power
transmission components in machines without further training. You get
step-by-step procedures for balancing, resonance, structural
vibrations, isolation, instruments, diagnostics, and trending. Many of
the methods described require only simple tools, eliminating the need
for a $20,000 laser alignment system.
Case studies covering
everything from simple fans to high-speed turbines give you examples of
real-world problem solving. You will find the extensive coverage of the
FFT spectrum analyzer a valuable addition to this hands-on toolkit.
From the Back Cover How
to Correct One of the Most Pervasive Machine Problems - Misalignment.
The misalignment of shafts and other components is one of the most
common causes of vibration and failures. Here, at last, is a practical
handbook that enables you to eliminate this costly problem. Written by
a pioneering enigneer and author in the field, this easy-to-follow,
step-by-step resource shows you how to: Diagnose Misalignment - using
vibration instruments, noise, dial indicators, hand feel, and visual
observations. Perform Precision Alignments - using dial indicators,
lasers, optical, and electronic measuring instruments. Graphical
plotting techniques are illustated with examples of the
reverse-indicator method, face-and-rim, and many variations. Move
Machines - from small ones to the largest ones with orchestrated
positioning techniques. Judge Acceptability - with alignment tolerances
based on speed and stresses at the joints. Deal with Complicating
Factors - such as faulty foundations, bent shafts, soft foot, bar sag,
piping strain, and thermal growth. Align Specific Machines - from
normal tw-machine one-coupling horizontal systems, to long drive
shafts, large and heavy machines, multiple machne trains, vertical
shafts, single-bearing generators, and reciprocating machines. This
authoritative guide also covers bearing alignments, gear alignment, and
pulley alignements. It also includes specific chapters on couplings,
optical tooling, and laser systems. Plus a valuable appendix contains
generic alignment specifications and drawings to make an alignment
fixture.
A creditcard is a system of payment named after the small plastic card issued to users of the system. A creditcard is different from a debit card in that it does not remove money from the user's account after every transaction. In the case of credit cards, the issuer lends money to the consumer (or the user) to be paid to the merchant. It is also different from a charge card (though this name is sometimes used by the public to describe credit cards), which requires the balance to be paid in full each month. In contrast, a creditcard allows the consumer to 'revolve' their balance, at the cost of having interest charged. Most credit cards are the same shape and size, as specified by the ISO 7810 standard. The most common creditcard size, known as ID-1, is 85.60 × 53.98 mm.
A user is issued credit after an account has been approved by the credit provider, and is given a creditcard, with which the user will be able to make purchases from merchants accepting that creditcard up to a pre-established credit limit. Often a general bank issues the credit, but sometimes a captive bank created to issue a particular brand of creditcard, such as Chase, Wells Fargo or Bank of America, issues the credit.
When a purchase is made, the creditcard user agrees to pay the card issuer. The cardholder indicates their consent to pay, by signing a receipt with a record of the card details and indicating the amount to be paid or by entering a Personal identification number
(PIN). Also, many merchants now accept verbal authorizations via
telephone and electronic authorization using the Internet, known as a Card not present (CNP) transaction.
Electronic verification systems allow merchants to verify that the card is valid and the creditcard customer has sufficient credit
to cover the purchase in a few seconds, allowing the verification to
happen at time of purchase. The verification is performed using a creditcard payment terminal or Point of Sale (POS) system with a communications link to the merchant's acquiring bank. Data from the card is obtained from a magnetic stripe or chip on the card; the latter system is in the United Kingdom commonly known as Chip and PIN, but is more technically an EMV card.
Other variations of verification systems are used by eCommerce
merchants to determine if the user's account is valid and able to
accept the charge. These will typically involve the cardholder
providing additional information, such as the security code printed on the back of the card, or the address of the cardholder.
Each month, the creditcard user is sent a statement indicating the purchases undertaken with the card,
any outstanding fees, and the total amount owed. After receiving the
statement, the cardholder may dispute any charges that he or she thinks
are incorrect (see Fair Credit Billing Act for details of the US regulations). Otherwise, the cardholder must pay a defined minimum proportion of the bill by a due date, or may choose to pay a higher amount up to the entire amount owed. The credit provider charges interest
on the amount owed (typically at a much higher rate than most other
forms of debt). Some financial institutions can arrange for automatic
payments to be deducted from the user's bank accounts, thus avoiding
late payment altogether as long as the cardholder has sufficient funds.
Creditcard
issuers usually waive interest charges if the balance is paid in full
each month, but typically will charge full interest on the entire
outstanding balance from the date of each purchase if the total balance
is not paid.
For example, if a user had a $1,000 transaction and repaid it in
full within this grace period, there would be no interest charged. If,
however, even $1.00 of the total amount remained unpaid, interest would
be charged on the $1,000 from the date of purchase until the payment is
received. The precise manner in which interest is charged is usually
detailed in a cardholder agreement which may be summarized on the back
of the monthly statement. The general calculation formula most
financial institutions use to determine the amount of interest to be
charged is APR/100 x ADB/365 x number of days revolved. Take the Annual
percentage rate (APR) and divide by 100 then multiply to the amount of
the average daily balance (ADB) divided by 365 and then take this total
and multiply by the total number of days the amount revolved before
payment was made on the account. Financial institutions refer to
interest charged back to the original time of the transaction and up to
the time a payment was made, if not in full, as RRFC or residual retail
finance charge. Thus after an amount has revolved and a payment has
been made that the user of the card
will still receive interest charges on their statement after paying the
next statement in full (in fact the statement may only have a charge
for interest that collected up until the date the full balance was
paid...i.e. when the balance stopped revolving).[1]
The creditcard may simply serve as a form of revolving credit,
or it may become a complicated financial instrument with multiple
balance segments each at a different interest rate, possibly with a
single umbrella credit limit, or with separate credit
limits applicable to the various balance segments. Usually this
compartmentalization is the result of special incentive offers from the
issuing bank, either to encourage balance transfers
from cards of other issuers, or to encourage more spending on the part
of the customer. In the event that several interest rates apply to
various balance segments, payment allocation is generally at the
discretion of the issuing bank, and payments will therefore usually be
allocated towards the lowest rate balances until paid in full before
any money is paid towards higher rate balances. Interest rates can vary considerably from card to card, and the interest rate on a particular card may jump dramatically if the card user is late with a payment on that cardor any other credit instrument,
or even if the issuing bank decides to raise its revenue. As the rates
and terms vary, services have been set up allowing users to calculate
savings available by switching cards, which can be considerable if
there is a large outstanding balance (see external links for some on-line services).
Because of intense competition in the creditcard industry, credit providers often offer incentives such as frequent flyer points, gift certificates, or cash back (typically up to 1 percent based on total purchases) to try to attract customers to their program.
Low interest credit cards or even 0% interest credit cards are available. The only downside to consumers is that the period of low interest credit
cards is limited to a fixed term, usually between 6 and 12 months after
which a higher rate is charged. However, services are available which
alert creditcard holders when their low interest period is due to expire. Most such services charge a monthly or annual fee.
A secured creditcard is a type of creditcard secured by a deposit account owned by the cardholder. Typically, the cardholder must deposit between 100% and 200% of the total amount of credit desired. Thus if the cardholder puts down $1000, he or she will be given credit in the range of $500–$1000. In some cases, creditcard issuers will offer incentives even on their secured card portfolios. In these cases, the deposit required may be significantly less than the required credit limit, and can be as low as 10% of the desired credit limit. This deposit is held in a special savings account. Creditcard
issuers offer this as they have noticed that delinquencies were notably
reduced when the customer perceives he has something to lose if he
doesn't repay his balance.
The cardholder of a secured creditcard is still expected to make regular payments, as he or she would with a regular creditcard, but should he or she default on a payment, the card
issuer has the option of recovering the cost of the purchases paid to
the merchants out of the deposit. The advantage of the secured card for an individual with negative or no credit history is that most companies report regularly to the major credit bureaus. This allows for building of positive credit history.
Although the deposit is in the hands of the creditcard
issuer as security in the event of default by the consumer, the deposit
will not be debited simply for missing one or two payments. Usually the
deposit is only used as an offset when the account is closed, either at
the request of the customer or due to severe delinquency (150 to 180
days). This means that an account which is less than 150 days
delinquent will continue to accrue interest and fees, and could result
in a balance which is much higher than the actual credit limit on the card.
In these cases the total debt may far exceed the original deposit and
the cardholder not only forfeits their deposit but is left with an
additional debt.
Most of these conditions are usually described in a cardholder
agreement which the cardholder signs when their account is opened.
Secured credit cards are an option to allow a person with a poor credit history or no credit history to have a creditcard which might not otherwise be available. They are often offered as a means of rebuilding one's credit. Secured credit cards are available with both Visa and MasterCard logos on them. Fees and service charges for secured credit cards often exceed those charged for ordinary non-secured credit cards, however, for people in certain situations, (for example, after charging off on other credit
cards, or people with a long history of delinquency on various forms of
debt), secured cards can often be less expensive in total cost than
unsecured credit cards, even including the security deposit.
Sometimes a creditcard will be secured by the equity in the borrower's home.[3][4] This is called a home equity line of credit (HELOC).
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