Help with some of my welds?

So i'm making a spinning helicopter like tool that I finally figured out how to put together and I got it to spin how I want it to spin and everything. The one problem i'm getting is that after a while the blades of the helicopter which are welded to the rotate piece will somehow will teleport somewhere else still welded to the rotate piece but have changed CFrame's . What is my problem here is my script.

while true do
    wait()
        local mouse = game.Players.LocalPlayer:GetMouse()
        local tool = script.Parent 

        local w = Instance.new("Weld") 
            w.Parent = Rotate1
            w.Part0 = Rotate1
            w.Part1 = Blade1
            w.C0 = Rotate1.CFrame:inverse()
            w.C1 = Blade1.CFrame:inverse()
            print ("weld1 made")                        

        local w2 = Instance.new("Weld")
            w2.Parent = Rotate1
            w2.Part0 = Rotate1
            w2.Part1 = Blade2
            w2.C0 = Rotate1.CFrame:inverse()
            w2.C1 = Blade2.CFrame:inverse()
            print ("weld2 made")            

        local Handle = tool.Handle
        local Rotate1 = tool.Rotate1

            local rotate = Instance.new("Motor",game.JointsService)
            rotate.Part0 = tool.Handle
            rotate.Part1 = tool.Rotate1
            rotate.C0 = CFrame.new(3,0,0) * CFrame.Angles(0,math.rad(90),0)
            rotate.C1 = CFrame.new(0,0,0) * CFrame.Angles(0,math.rad(90),0)
            print ("rotate joint made")

            local Moving = mouse.Button1Down:connect(function()
                rotate.MaxVelocity = math.rad(30)
                rotate.DesiredAngle = math.rad(99999999999999999999999999999999999999999999999999999999) -- Couldn't figure out to make it go forever so i just put a number so large that it would take more than a lifetime of spinning to finish
                print ("Spinning")
            end)

        local stop = mouse.Button1Up:connect(function()
                rotate.MaxVelocity = math.rad(0)
                rotate.DesiredAngle = math.rad(0)
                print ("stopping")
        end)
    end