How to Rotate a Welded Part

[ArctixDeveloper (ArctixRBLX)]

My goal for this script is to have it rotate a mesh that is welded to a bunch of other meshes without rotating all of the meshes/parts that are welded to it.

So, there is a plow that is welded to the car automatically by A-Chassis. When my current code runs, it rotates the entire car instead of just the plow mesh.

Current Code:

local blade = script.Parent.Blade
local rotationAmount = 20
local rotationSpeed = 1

function rotateBlade()

	local currentRotation = 0

	while currentRotation < rotationAmount do
		blade.CFrame = blade.CFrame * CFrame.Angles(0, math.rad(rotationSpeed), 0)
		currentRotation = currentRotation + rotationSpeed
		wait()
	end
end

rotateBlade()

Video demonstrating what happens currently:

Please let me know how to do this or if it is even possible.

[EmbatTheHybrid (Embat)]

I believe if you want to rotate a welded part you have to manipulate either the C0 or C1 properties of the weld rather than changing the CFrame of the part directly, which means you have to use a standard weld rather than a weld constraint

A post with a similar issue to yours has been posted before and has a solution set so perhaps that could help you out

Rotating a Welded Part?

I believe what you’re looking for is CFrame:Inverse(). Try referring to this code: local tpart = workspace.TargetPart local cfpart = workspace.CFPart local w = Instance.new("Weld",tpart) w.Part0 = tpart w.Part1 = cfpart local cf0 = tpart.CFrame local cf1 = CFrame.new(0,10,0) * CFrame.Angles(0,math.rad(45),0) w.C0 = cf0:Inverse() w.C1 = cf1:Inverse() You’d have to update this weld’s CFrame via RunService because Part1 will always update according to Part0, but if you really need to…

[ArctixDeveloper (ArctixRBLX)]

This method doesn’t seem to be working for me and just glitches out the plow, or “Blade”.

[EmbatTheHybrid (Embat)]

Might mean you need to change around how you set the weld

Perhaps try something like this to change the rotation?

weld.C0 = weld.Part0.CFrame:ToObjectSpace(CFrame.new(weld.Part1.Position + weld.C1.Position) * CFrame.Angles(0, math.rad(rotationSpeed), 0))

[ArctixDeveloper (ArctixRBLX)]

Using a standard weld results in this happening to the plow.

[EmbatTheHybrid (Embat)]

You might need to change the value of C1 around to fix that, or change the rotation itself

[ArctixDeveloper (ArctixRBLX)]

This is what happens with this code,

local blade = script.Parent.Blade
local rotationAmount = 20
local rotationSpeed = 1
local weld = blade.ImportantWeld

function rotateBlade()

	local currentRotation = 0

	while currentRotation < rotationAmount do
		weld.C0 = weld.Part0.CFrame:ToObjectSpace(CFrame.new(weld.Part1.Position + weld.C1.Position) * CFrame.Angles(0, math.rad(rotationSpeed), 0))
		currentRotation = currentRotation + rotationSpeed
		wait()
	end
end

rotateBlade()

[ArctixDeveloper (ArctixRBLX)]

Thanks for the help, I was able to get it working with this code after changing around some things.

local blade = script.Parent.Blade
local rotationAmount = 20
local rotationSpeed = 1
local weld = blade.ImportantWeld

function rotateBlade()
	local currentRotation = 0

	while currentRotation < rotationAmount do
		weld.C0 = weld.C0 * CFrame.Angles(math.rad(rotationSpeed), 0, 0)
		currentRotation = currentRotation + rotationSpeed
		wait()
	end
end

rotateBlade()