The number of workers needed to operate an automatic block making machine can vary based on several factors, including:

1. Type of Machine: Fully automated machines may require fewer operators compared to semi-automated ones.
2. Production Capacity: Higher capacity machines may need more workers for monitoring and maintenance.
3. Shift Patterns: The number of shifts (e.g., single shift, double shift) can influence staffing needs.
4. Maintenance and Supervision: Additional workers may be needed for maintenance and quality control.

Typically, for a fully automated block making machine, you might need:

• 1-2 Operators: To monitor the machine’s operation.
• 1 Maintenance Technician: For regular upkeep.
• 1 Quality Control Inspector: To ensure product quality.

In total, around 3-4 workers could be sufficient, but this can vary based on the specific operational setup and requirements.