Make a part that spin faster and faster

[AK4t5u]

1. What do you want to achieve?
   I want to make a part spinning
   
   
2. **What is the issue?
   I can make it spin, but I can’t make it spin faster after a certain amount of time.

sphere = script.Parent --This means that you have to have the script in the sphere part
a = 0
repeat
	sphere.Rotation = Vector3.new( 0, a, 0)
	wait(10)
	a = a+1
	sphere.Rotation = Vector3.new( 0, a, 0)
	wait(10)
	a = a+2
	sphere.Rotation = Vector3.new( 0, a, 0)
	wait(10)
	a = a+3
	sphere.Rotation = Vector3.new( 0, a, 0)
	wait(10)
	a = a+4
	sphere.Rotation = Vector3.new( 0, a, 0)
	wait(10)
	a = a+5

[index_l (index)]

There are much easier ways to make a part spin. Check out this forum