Did you ask the right questions?
Where is the machine?
What is the machine used for?
Did you buy the machine or build it?
If the machine is in your home and it it used for a hobby and you built it, then it is personal property and MIGHT be covered in your house insurance, though watch out for exclusions and definitions in the policy. Hope you saved all the receipts and have a photographs and a note from your grandmother that you actually did build it. If you make ANY money EVER though the use of the machine, the insurance company COULD say the machine is used for commercial purposes and disallow the claim. You know those insurance companies, all they like to do is collect premiums and deny claims. Ruins their day when they actually have to write a check....
If the machine is used for commercial purposes, and you purchased it, it will be insured individually as equipment by a commercial lines carrier.
But laws are different in all 50 states and as with all insurance, and, as usual, it depends how to insure it.
As much as you may not like to, the best course of action would be to contact an insurance agent.