A concise process for coordinating the barfeed distance, facing stock, tool nose radius, and Z work offset.

An initial barfeed by stopper works by shifting the initial machine setup away from the production position, feeding the bar against a correctly positioned tool, and then facing the stock to establish finished Z0.

Process overview

1. Determine the barfeed distance. Define the total distance that the bar must advance.
   
2. Shift the initial work offset. In the initial Machine Setup, move the work offset in Z the amount you want to move the stock out. This creates room for the bar to advance into its production position. 
3. Include facing stock. If the finished face is Z0, leave the desired facing allowance beyond it. After feeding, the raw bar face should be at Initial Barfeed distance Plus Facing Stock 
4. Account for the stopper tool. Define the correct tool orientation and nose radius. Position the tool so its actual contact point—not simply its programmed tip—stops the bar at the required raw-face location. 
5. Create the barfeed-by-stopper operation. Position the stopper, release the workholding device, feed the bar, clamp the workholding, and retract the stopper. 
6. Face the stock. Run the facing operation to remove the facing stock and establish finished Z0.

Before production

Confirm that the Z-negative work-offset shift equals the planned feed distance, review the posted clamp and barfeed commands, check all machine clearances, simulate the cycle, and prove it out in single block at reduced rapid. Measure the first faced part before releasing the program for production.