is there a way to attach a ray to a object?

so ive been making a sword combat system and i am using raycasting too detect collisions but i dont know a way too make the ray stay on the sword so i ended up just casting a bunch of rays every wait() but the problem is that its very inaccurate so is there a better way to do this?

script

for i = 1,8,1 do
    wait()

    local ray = Ray.new(script.Parent.Position, (script.Parent.CFrame.lookVector).unit*4)
    local hit, position = game.Workspace:FindPartOnRayWithIgnoreList(ray, {script.Parent, script.Parent.Parent.Head, script.Parent.Parent["Left Arm"], script.Parent.Parent["Left Leg"], script.Parent.Parent["Right Leg"], script.Parent.Parent.Torso, script.Parent.Parent.HumanoidRootPart})
    if hit then
        if hit.Name == "Head" or hit.Name == "Torso" or hit.Name == "Right Arm" or hit.Name == "Left Arm" or hit.Name == "Left Leg" or hit.Name == "Right Leg" or hit.Name == "HumanoidRootPart" and hit.Parent.Hit.Value == false then
            game.ReplicatedStorage.Events.KIllerEvent:FireServer(hit)
            print(hit.Name .. " Was Hit!")
            hit.Parent.Humanoid.Health = hit.Parent.Humanoid.Health - 13
            hit.Parent.Humanoid.MaxHealth = hit.Parent.Humanoid.MaxHealth - 4
            wait(0.1)
            hit.Parent.Hit.Value = false
        else
            print(hit.Name .. " is not a valid part")
        end
    end
end