my milwaukee m18 drill is making a weird grinding noise, is it safe to use?

No, you should stop using it immediately. A grinding noise indicates a serious internal mechanical failure, which could be dangerous.

FIX: Here's what you need to do:

1. Remove the battery pack to prevent accidental activation.
2. This type of internal defect is likely covered under the five-year limited warranty for the tool.
3. You'll need to send it in for service. Gather your proof of purchase.

IF THAT DIDN'T WORK: If Milwaukee's examination determines the damage is from misuse, alterations, abuse, or an accident, it won't be covered. Normal wear and tear is also excluded.

HEADS UP: To get service, you must return the tool freight prepaid and insured to a Milwaukee Service Center or Authorized Service Station. Call 1-800-SAWDUST or use the website to find the nearest location.