Fixturing a thread rolling head in a modern CNC machine can be enhanced with the addition of a fixturing flat on the shank of the tool. The present design of the modern EVO style Fette thread rolling tool can be effectively anchored by machining a flat anywhere on the 360-degree circumference of the tool. This is effective due to the ability of configuring the closing ring in to any position required.
The multitude of older tools that were designed with a fixed closing handle had to be carefully positioned to identify the accurate location of a fixturing flat. Without a fixturing flat on the shank, it was probable that the tool could spin if something went wrong with the process. This in turn could lead to a collision problem and probable tool breakage. Machining a flat from the manufacturer was not possible since it was unclear where and on what machine the tool would be installed.
We can help with strategies to fixture the tool accurately once we know the machine detail. Contact us for processing assistance.
Thread rolling on CNC machines unattended requires a closing scheme to reset the head after each rolling cycle. This is accomplished with a program move that will cycle the closing handle past a fixed point within the machine that will wipe the handle closed. Typically, a program change to the parameters must restrict turret movement to one fixed direction.
Two alternatives exist permitting the tool to close. The first is with a coolant driven attachment. The second locks the tool in a closed position and uses a Roll-On Roll-Off™ strategy. The two attachments achieve the desired result with the coolant closer using elevated coolant pressure available on some although not all CNC machines. The locking attachment can operate on virtually any machine at a significantly lower cost. The two strategies allow the parameters of the machine to remain unchanged and frequently do not add additional cycle time to the process. We are always available to discuss the most practical and cost-effective solution to your application.