I assume you haven't put a reel of film onto the projector and looped it through to the back spool. The front spool usually 'freewheels' whilst the film is pulled through the projector and taken up by the motor driven rear spool.
It is possible that the friction drive and/or drive belt have deteriorated with age, as the mentioned projector is a rather elderly 'classic' of the dual 8mm series.
If in doubt, don't risk your family pictures. Try the unit with an old piece of film on small spools.
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