I deposit my pay checks through banking machines. Do i need to wait a few days or whatever for the cheque to clear to spend my newly deposited money. My balance is updated right away but im not so comfortible spending money from a cheque that hasnt been processed yet.
Whenever I am concerned over the value of a check, I go to the bank it is drawn on and cash it rather than deposit it to my account.
On the other hand, if these are paychecks and your employer is at all responsible and solvent, then you should have no problems. I believe that employers who pass worthless paychecks to their employees would be subject to severe retribution, as they violate not only fraudulent check laws but also wage-and-hour laws because they have failed to pay you on time.
Your mileage may vary, I am not a legal expert. 
Check with your account agreement. Most banks place a hold on newly deposited funds for one to as much as fourteen days after the deposit. Often, the length of the hold varies depending on the size and form of the deposit. One bank I used to deal with made the first $100 immediately available, held cash for one day if presented in person and two days if dropped in a depository (hold imposed solely for the purpose of verifying amount and authenticity of currency), and held checks for from one to ten days depending on the amount of the deposit and what bank it was drawn on. Funds deposited via ATM machines may be held for longer times than those deposited at the counter, too.
Just because the funds appear in your balance does not mean they are available for withdrawal. A check which cannot be honored without drawing into held funds is normally held until the other hold clears, but under some circumstances the bank can return the check dishonored instead.
Of course, direct deposit funds are never held (they are in the form of a wire transfer and are guaranteed good on presentation), which is a damn good reason to use direct deposit payroll if at all possible.
Are you concerned that the check may be returned, unpaid, from the other bank or are you concerned that your bank may place a hold on the funds? Either could be a valid concern. If you have some concern about the check being returned, KneadToKnows advice is good - cash the check at the bank on which it is drawn then deposit cash to your account. If that is not possible, then give the check time to clear before you draw on the funds. In the US a local check (same city) should clear in 2 business days, a check drawn in the same state should clear in 3 business days and a check drawn on an out-of-state bank should clear in 5 business days, as required by federal regulation CC (Reg CC). They will often clear faster than that but the only way you can verify is to call the bank on which the check is drawn and ask if that check cleared. You’ll need to supply the account number, check number, and amount.
If it is a hold you are concerned about, talk to your branch manager. Ask about the likelyhood of a hold being placed on your paycheck. The decision to hold funds is usually based on your account status (how long it’s been open, average balance, how the account has been handled) and the amount of the check deposited. The bank is required to notify you of any hold placed on a deposit but if you use the ATM that notification will likely be by mail. You won’t know about it until the notice gets to you 2-3 days later. You could call your bank or check your balance after the deposit posts to your account to see if the funds are available. Holds are also covered under Reg CC.