Modernization of a lathe for work with CNC

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The children have grown up, and there is nothing to talk about with my husband

In our home workshop we have a Jet GBH-1340A metal lathe with a digital readout device (DRO). We have been discussing the possibility of adding a CNC to it for a long time, because without computer control, some types of parts are extremely difficult to manufacture with high precision. The article tells about the experience gained in this process, including the mistakes made and recommendations for avoiding them, and also reveals in detail the entire process from the initial assembly to obtaining the finished result.

Preparation

Nevertheless, we approached the project with a certain degree of procrastination. From the beginning, we selected a spindle VFD controller, NEMA 34 stepper motors and machine axis drivers based on what we found in our Tormach 770 milling machine. We also found a parallel port interface board for CNC control on the internet. One of the main criteria for choosing all spare parts was their cheapness, although in the end they had to overpay. As the saying goes, the miser pays twice.

Details of profit and have been put aside for about a year due to the large number of other active projects. We only used this occasionally to take some measurements and think about the exact placement of the stepper motors. The sudden failure of the spindle motor of our Jet made us fully switch back to the implementation of our plans. It was then that we got out all the prepared parts and got down to rework in earnest.

Project summary

Time Spent: Many Weekends Difficulty: Advanced Cost: $ 2,500- $ 2,800

Materials

Tools

  • CNC milling machine, end mills, boring bars, turning tools for machining motor mounts.
  • Drill, screwdrivers, wrenches, wire strippers, crimpers, etc.
  • Soldering iron and tin.
The whole reconstruction process was divided into three stages:

  • Modification of the mechanism itself.
  • Assembling the control unit.
  • Install and configure the control PC.

Machine Modification Part

This machine has the following features: 40 "center distance and 13" maximum workpiece diameter. By default, the spindle speed is controlled through a gearbox located behind the spindle and driven by a 230V single phase motor. The gearbox did not need to be changed; we just chose the optimal transmission settings, and then, when using the CNC, the speed control will already be carried out by the controller of the frequency converter. The failure of the original single-phase motor, in fact, only played into our hands, since its replacement with a three-phase analogue gave a greater degree of control and made it possible to double the maximum possible rotation speed, which for the deceased motor was 1,750 rpm. The best part is that the frequency converter was able to convert 220V from one to three phases. The original control box was removed from the back of the machine and some of its control relays, along with other parts, migrated to the new one.

The carriage holding the cutting tools had two options for controlling its movement along the Z axis. (On a lathe, the Z axis goes from left to right, and the X axis is the cross feed axis). There is a main lead screw for general cutting and a second lead screw that rotates in sync with the threading spindle. Both screws are driven by a single gearbox and are used to move the carriage using the control levers on the carriage itself. We decided to remove the tapping screw and the rod that controls the primary lead screw. This allowed us to drive the main lead screw using a stepper motor (SM) located at the opposite end and secured by a belt and pulleys. The main screw only took just over 50 rotations to move the carriage 1 ”and we figured this would give some degree of control over accuracy.

And is it possible to prepare for family crises

In our home workshop we have a Jet GBH-1340A metal lathe with a digital readout device (DRO). We have been discussing the possibility of adding a CNC to it for a long time, because without computer control, some types of parts are extremely difficult to manufacture with high precision. The article tells about the experience gained in this process, including the mistakes made and recommendations for avoiding them, and also reveals in detail the entire process from the initial assembly to obtaining the finished result.

Preparation

Nevertheless, we approached the project with a certain degree of procrastination. From the beginning, we selected a spindle VFD controller, NEMA 34 stepper motors and machine axis drivers based on what we found in our Tormach 770 milling machine. We also found a parallel port interface board for CNC control on the internet. One of the main criteria for choosing all spare parts was their cheapness, although in the end they had to overpay. As the saying goes, the miser pays twice.

Details of profit and have been put aside for about a year due to the large number of other active projects. We only used this occasionally to take some measurements and think about the exact placement of the stepper motors. The sudden failure of the spindle motor of our Jet made us fully switch back to the implementation of our plans. It was then that we got out all the prepared parts and got down to rework in earnest.

Project summary

Time Spent: Many Weekends Difficulty: Advanced Cost: $ 2,500- $ 2,800

Materials

  • Metal-working machine with digital display device (DRO);
  • 3-phase asynchronous motor Marathon # 145THFR5329 / $ 500, got up to replace the burnt out spindle motor;
  • Emerson Commander SK VFD Motor Controller / $ 450;
  • CNC control board for LPT port, namely C11G multifunctional CNC board from CNC4PC website. om / $ 68;
  • NEMA 34 stepper motor (2 pcs.) for X- and Z-axes, Model 34HS38-3008S / $ 110 each;
  • Stepper motor driver board (2 pcs.) .) GeckoDrive G213V / $ 150 each;
  • Computer with Linux CNC software (available on linuxcnc.rg). We used an ancient Pentium 4;
  • Roxburgh EMC filter (EMC) to suppress line noise;
  • 40 ″ Ball Screw with ball nut / $ 225;
  • Thrust bearings (4 pcs.);
  • Motor support (2 pcs.) Made of stainless steel and aluminum on a CNC Tormach 770;
  • Coupling sleeve (2 pcs.) , she is a flexible shaft coupling, on Amazon from $ 5 to $ 50 depending on size;
  • Control unit housing, steel, size 24 ″ × 16 ″ × 10 ″;
  • Switches for power supply, protective shutdown, etc.;
  • Wires: 12ga, 14ga and 22ga;
  • Relays, switches, etc. from disassembled parts of the machine;

Tools

  • CNC milling machine, end mills, boring bars, turning tools for machining motor mounts.
  • Drill, screwdrivers, wrenches, wire strippers, crimpers, etc.
  • Soldering iron and tin.

The entire reconstruction process was divided into three stages:

  • Modification of the mechanism itself.
  • Assembling the control unit.
  • Install and configure the control PC.

Machine Modification Part

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