Hello Julie,
Nice machine that 347, first of all have you put the needle in the right way round, flat side to the back? if you have the open the slide plate to make sure the raceway is moving round, check this by turning the balance wheel towards you,if the hook still does not pick up the thread then the chances are you will need the machine retiming either at a shop or I can type up full instruction for you on how to do it, try the above first of all and if you need the instructions just e-mail me drivewithken@blueyonder.co.uk
drivewithken@blueyonder.co.uk, November 2007