Tweening a weld

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#1

I am trying to make a piston system but I wont get it working. I can’t seem to wrap my head around ToObjectSpace and welds.

Heres a gif representing what I want the parts to do with the White cube being Part1 and the Black cube being Part0:

WeldCFrame

This is my attempt at making this:

local Piston = script.Parent;

local weld = Instance.new("Weld");
weld.Parent = Piston;

weld.C0 = Piston.Part0.CFrame:Inverse();
weld.C1 = Piston.Part1.CFrame:Inverse();

weld.Part0 = Piston.Part0
weld.Part1 = Piston.Part1

local ts = game:GetService("TweenService");

local cfValue = Instance.new('CFrameValue')
cfValue.Value = weld.C0

local base = weld.C0

cfValue.Changed:Connect(function()
	local travel = weld.Part0.CFrame + cfValue.Value.Position;
	weld.C0 = travel:ToObjectSpace(weld.Part1.CFrame)
end)

local goal = {Value = CFrame.new(weld.Part0.CFrame.LookVector * 5)}

local cfTween = ts:Create(cfValue,TweenInfo.new(10),goal)
cfTween:Play()

wait(3)

ts:Create(weld.Part1, TweenInfo.new(4), {Position = weld.Part1.Position + Vector3.new(0,5,0)}):Play()

How would I recreate this in a script?

#2

maybe try to use motor6d instead of using weld ?

#3

Doesn’t Motor6D use the same technology as Weld?

#4

weld are for keeping part at the same distance
motor6d are for moving part

#5

or you can just use WeldConstraint because you can still move part that are being welded to other part

#6

The thing with WeldConstraints though are that they don’t work with tweens

#7

did you try to unanchor part0 yet

#8

yes its just the math that is wrong

#9

I realise im about 2 years late but have you ever found a solution? Currently got a similar problem and ive got no idea on how to fix it…