I got the reading from a metal screw in the caseing and the SS drum inside to a copper pipe assuming the pipe would earth.
To me this implies the washing machine or the circuit its connected to isn’t “earthing” a fault.
As you say the copper pipe is “earthed”, you shouln’t have a difference in voltage between the two. ie; if the “earthed” parts of the washing machine are at 110v, so should the copper pipe.
I’d plug the washine machine into a different circuit and test again, also test the copper pipe to nuetral as it could be the copper pipe is introducing a fault. Use a testing lamp if possible.
110v is a nasty shock if your in laws touch the machine and the copper pipe at the same time.
Get it checked out ASAP!!!!
There is a lot of confusion as to what “earthing” or the correct term “equipotential bonding” is for in a property, but its generaly to bring all exposed parts to the same volage in a fault situation. Thats why my thoughts are that the copper pipe should also be at 110v.