Why won't this code work?

I'm trying to make 'Jericho1' move smoothly to a position, but when I use the code below it jumps to the last digit.

for i = 1, 50 do
   Jericho1:SetPrimaryPartCFrame(CFrame.new(-31.209-i, 3.451, -126.11))
end

Could someone please tell me what's wrong and/or what I need to do to fix this?

Thanks.