Jig grinding machines are used for precision grinding of complex shapes and holes, and are used in industries such as aerospace, automotive, and machine tool manufacturing. Here are ten manufacturers that are well-known for producing jig grinding machines:

1. Moore Tool Company, Inc.
2. Hauser S 40 CNC (A member of the JUNKER Group)
3. SIP-HAUSER S50DR Jig Grinding Machine
4. Mikromat GmbH
5. Hardinge Inc.
6. Jig grinding machine cnc Hauser S 35-400
7. Strohm GmbH
8. Shimada Kikai Co.,Ltd
9. DATRON AG
10. Star Cutter

This list is not exhaustive and in no particular order. it is based on market share, reputation and industry standards in specific countries and industries. Additionally, there are few more specialized manufacturers that focus on specific applications like aerospace or medical.