Swing part on axis

local increment = .05 -- best to keep it to a 5-base of 1(0)-base increment

function RunAnimation(p)
    local p = p or script.Parent
    local rightframe = p.CFrame + p.CFrame:vectorToWorldSpace( Vector3.new(1,0,0) * p.Size.X/2 )
    for i = 0, math.pi/2, .05 do
        wait()
        local newframe = rightframe * (CFrame.Angles(0, -i, 0) * CFrame.new(p.Size.X/-2,0,0))
        p.CFrame = newframe
    end
end

RunAnimation()