Dear Geeta, your Factory as stated by you "mechanical production company" comes under Minimum Wages Applicable for Engineering Industry
The categorization of Wages for Engineering Industry is on the basis of Skill of Employee i.e
Highly Skilled
Skilled
Semi Skilled
Un Skilled
Please follow Highly Skilled/Skilled Employee salary for HR Executive
For your ready reference, i am attaching herewith MW for 2017-18 for your perusal.
While raising question, you are supposed to give complete details of your Factory.I presume that you are registered under The factories Act, 1948 in Karnataka