The zero return sequence follows as such:

1. 4th Axis 
2. Z + 5th Axis
3. X+Y 
4. TC Arm

WARNING: The zero return sequence will ignore safe zones, if there is a tool present in the tool holder it can crash on the sheet metal, table or double arm. 

When safe zones are active there are limitations to certain axis movements to prevent crashes from occuring. The message box "RESTRICTED ZONE REACHED" will appear any time a user reaches these limits. 

If this message box appears in an area it should not, please re-calibrate Safe Zones.

If this issue persists please contact the Haas Service department. 

Max travels for the Z-axis are determined by the B position. 

The image shows the Z-max travel at B=0, the machine will be able to move to this position before registering a safe zone limit has been reached.

If B is rotated to its 90 degree position the Z-axis max travel  will change so that the B-axis casting does not crash into the table. 

The image showns the position where this max travel limit is located.

NOTE: All other movement is taken into consideration for safe zones, if the user tries to rotate the B-axis while in its max travel limit they will receive a restricted zone reached message.

The VR head can crash into the table at any non-zero position if the B-axis is commanded to move. 

A zero return sequence can cause the head to crash as it will rotate the B-axis first and ignore safe zones. 

Another possible crash zone can occur when there is a long tool or a test bar in the spindle.

If tool height offsets are not correctly set or SETTING 408 is set to 1 the B-axis can rotate enough to crash into the double arm or sheet metal. 

NOTE: The machine will also crash during the initial machien zeroing as safe zone are ignored regardless of setting 408.

The VR-Series uses HSK63F tool holders. All tools must be balanced to 20,000 RPM. Refer to the maintenance section for correct tool holder maintenance.

CAUTION: Never operate the spindle without a tool holder. The machine will generate Alarm 973 - FIXTURE CLAMP FAILURE.

CAUTION: Never leave a dirty or hot tool holder in the spindle overnight. This can cause the mating surfaces between the tool holder and the spindle to stick. Put a clean tool holder in the spindle at the end of the work day. The tool holder must be at room temperature, or it must be the HSK 63F Protective cone supplied by HSD.

Press [MDI] and type [T] and the number of the tool you want to load. Press [ATC FWD] .

The second home feature can be used to quickly put the spindle into position to load tools.

To set the second home position jog the machine to the position shown in the figure below. Press [settings] and navigate to the User Positions tab. Select Second Home Position and press [F2] on each axis second home position setting.

Press the [Second home button] on the side a the pendant to send the spindle to the tool load position.

CAUTION: Second Home can crash the machine if there is an obstruction between the current spindle position and the second home position.

With the tool in your hand press and hold the [tool release] button located on the Z-Axis cover or pendant. Insert the tool into the spindle and release the [tool release] button.

CAUTION: Make sure the tool is fully seated into the spindle so that the face of the tool holder mates flush with the spindle face. If the spindle clamps the tool holder prematurely there will be a gap between face of the tool holder and the spindle face. The spindle will not rotate, but a tool change can be commanded which will cause a tool change failure or the tool to be dropped.

Cycle the tool into the tool changer and repeat this process until all the tools necessary for your application are loaded.

The Vector Jog feature allows the operator to jog the machine along the vector of the current spindle orientation. Vector jogging can be used at any time. It is especially useful for recovering a tool if the machine loses power while machining a part.

To recover a tool after power loss during machining press [power up] . The Zero Return popup will appear.

Type VJ and press [HANDLE JOG] . Jogging in the positive direction will move the tool away from the part along the current spindle vector. Jogging in the negative direction will move the tool towards the part along the current spindle vector.

The Tap Recovery feature will automatically make use of vector jogging to recover taps form non vertical holes.