STARRETT 284 ACME SCREW THRD RADIUS GAGE

Series 284

FEATURES:

• Standard for grinding and setting tools when cutting Acme threads. Acme threads have the same depth as square threads but the sides of the threads are at an inclination of 14-1/2° (29° included angle).
• The angles and edges of this gage are hardened, ground and carefully tested.
• The angle of the thread cutting tool is checked on the large-precision ground "V" at the end of the gage. The tool is then ground on the end to the width of the slot of whatever pitch is being turned. It is then set in the lathe using the half angle.

284 STARRETT ACME STD. SCREW THREAD RADIUS GAGE