The solution to the problem proposed by the CNC lathe

Based on the previous article, we propose a solution to the problem of CNC machine tools.
1. Since the center of the threaded hole is on the centerline of the spline shaft, and the center of the tool turret of the CNC lathe turret passes through the center of the spindle when moving in the X-axis direction, you can consider using a reducing sleeve to install the drill and tap on the center line of the spline shaft. On the impact tool seat, use an ordinary CNC lathe to drill and tap the central threaded hole at one end of the spline shaft.
The CNC systems used by the three ordinary CNC lathes are all FANUC systems. The G codes of FANUC system have command code G74/G83 for drilling cycle, and command code G84 for tapping cycle. After testing, these three codes can all be used for lathes.
For the processing of this spline shaft, the processing plan is redesigned. One end is turned on the CNC turning center and the groove is milled, and the other end is turned on the ordinary CNC lathe, and the thread is drilled and tapped.
2. Selection and installation of fixture tools. When turning the other end of the ordinary CNC lathe, drilling and tapping the thread, the selected fixture is the soft three-jaw and the tail center. The internal thread size is M16×1.5-7H. When selecting the tool, the drill bit selects a straight shank twist drill with a diameter of 14mm, and the tap uses a universal shank machine tap M16×1.5-H3. When installing, use the corresponding diameter reducing sleeve to connect the drill bit and the tap. They are respectively fixed on the keyhole knife seat, as shown in Figure 2 and Figure 3.

3. CNC lathe processing program. During drilling, the drilling cycle G code command G74/G83 is not used, but the G01 linear interpolation command is used. This is another programming method available for drilling. The sample program is as follows:
M01; (Program selective pause command, the function is to stop the spindle)
T0202; (Change to No. 2 tool No. 2 tool compensation, this program No. 2 tool corresponds to the drill)
M08; (cutting fluid on)
M03 S1000; (Spindle rotates forward, speed 1000r/min)
G0X0.Z5.; (Quick positioning to coordinate (0.5))
G0l Z-30. F0.1; (The tool feeds linearly in the Z axis direction to -30mm, the feed speed is 0.1 mm/r)
G04 X1.; (Pause feed for 1s, smoothing processing)
G0Z50. (Quickly retreat to 50mm in the direction of the continent)
The example program of tapping thread processing is as follows, using the thread tapping cycle G84 command code for programming:
M01; (Program selective pause command, the function is to stop the spindle)
T0404; (Change to No. 4 tool No. 4 tool compensation, this program No. 4 tool corresponds to tap)
M08; (cutting fluid on)
M03; (Spindle rotates forward)
G0Z50.; (Quick positioning to 50mm in the Z-axis direction)
X0. ;(Quick positioning to 0mm in the X axis direction)
Z5. ;(Quick positioning to 5mm in the Z axis direction)
M29 S61; (Rigid tapping command, control spindle rotation and Z-axis feed synchronization, set spindle speed 61r/min)
G84 X0.Z-46.F1.48; (tapping the thread to -46mm in the Z-axis direction, the pitch is 1.48mm)
G0 Z100.
Note that if you are tapping a left-hand thread, you must change M03 to M04 in the program. When using the G84 command, tap the thread to the set position of the Z axis, and the spindle will reverse and exit by itself. The feed rate of the spindle is Fu003dS (spindle speed) × P (pitch), which is calculated by the system, and the system automatically controls the rotation of the spindle Synchronize with Z axis feed.
The command code G74/G83 of the drilling cycle has also been explored. These two commands can be used on machining centers as well as on CNC lathes. The G74 command is more suitable for end-face deep hole drilling, and the drill retraction amount can be set during the drilling process. G83 is suitable for high-speed deep hole drilling, but the drill bit is required to have water out of the center, otherwise the drill bit is easy to hit when it is fast-feeding after retreating.