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Go to Datum curve and select through equation, in equation select cartesian .
paste the below equation,
x=(15+10*t)*cos(360*5*t)
y=(15+10*t)*sin(360*5*t)
z=0
explanation:
x = ( radius + increment * t * nrofturns ) * cos ( t * nrofturns * 360 )
y = ( radius + increment * t * nrofturns ) * sin ( t * nrofturns * 360 )