Questions tagged [cnc]

Computer Numerical Control - the computer or digital control of ,typically, machine tools in a machine shop like lathes, mills, gougers and drill presses.

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Closed loop control of a stepper motor (i.e. servo system)

Crucial to the performance of a CNC is its ability to precisely, accurately and quickly move to the directed position. Stepper motors are perhaps the most popular (and therefore cheapest) motors ...
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2 votes
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Using Chinese 3018 CNC mill with KiCAD and FlatCAM for PCBs - "tool change"

OK here's the deal, KiCAD of course does a wonderful job with schematics, footprints, Gerber files, they even provide a pretty decent autorouter. Then you take the Gerbers and Excellons over into ...
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Having problems going from KiCAD -> Panelizer -> FlatCAM, outline not recognized

I'm a total newbie to FlatCAM but not to PCBs. I'm trying to use KiCAD and send the files through the common Panelizer (ThisIsNotRocketScience) software, I want to do two layer boards on my 3018 (...
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Eagle PCB G-Code bottom layer incomplete

I first started milling my own boards about 3 years ago using a grbl CNC mill and everything worked great. The designs have been done in eagle cad with the PCB gcode ULP. I put it down for quite some ...
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182 views

GRBL issue with PWM on Arduino CNC Shield

PWM with laser plugged in PWM with laser unplugged I'm having some issues with my PWM laser control. When I connect the laser, the voltage on the Z+ pin goes up to around 1V which is undefined in ...
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is it possible to make cnc without embedded motion controller over CANopen [duplicate]

I want to make CNC software. while doing this, I do not want to use any motion controller, PLC, FPGA, etc... I use three items. 1-USB to CAN converter, 2-servo motors, and their drivers, 3-a computer. ...
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Can a computer control up to 10 motor drivers directly via the CANopen communication protocol? [closed]

I guess my question was not so clear, so I am editing now. I want to make CNC software. while doing this, I do not want to use any motion controller, PLC, FPGA, etc... I use three items. 1-USB to CAN ...
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PWM to voltage for servo control

I have Chinese "no name" servo drives with following inputs for speed and torque mode: I have got a MESA 6I25 card and want to use LinuxCNC as a controller. I want to design a BOB (break ...
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DIY electromagnetic shielding (CNC mill)

I'm building a DIY CNC router. I'm running at a low RPM and only planning on cutting soft materials (wood and under, maybe a PCB). I'm currently having problems with magnetic interference. When ...
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Can someone tell me how i make the MACH3 software to communicate with this board?

I have a project to do in which I will need to use this board to move one of the axis of a machine. But I can't find the datasheet for that board. It serial number appears to be HW-3561224. Besides, ...
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Should I wire my CNC limit switches as NC or NO?

I built a CNC router about a year back and have had intermittent limit switch triggering for a good while. After doing everything I could to remove any EM interference from the system (run the signals ...
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Stepper motor skipping steps until I lower voltage

I have four of KL23H2100-35-4B stepper motors on my 3-axis CNC (doubled up on the y-axis); these are 3.5A 4-wire bipolar stepper motors with a rated 2.8mH inductance. I am driving them with the ...
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206 views

Trouble understanding OEM HP Sensor CB781-80006 circuit [closed]

I am having trouble understanding an OEM HP Sensor CB781-80006 circuit, I'm a beginner in electronics. Does anyone know to tell me what are the values ​​( VCC, GND, and outputs ) this sensor was ...
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Identifying a connector

Can anyone identify this connector? Female part: The crimp parts look like this: And the male part looks like this: Context: These came with a Smoothieboard v1.1. I keep messing up the crimp ...
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Stepper Motors that are connected to A4988 drivers shake and miss steps when MCU connected to galvanically isolated relay. What may cause this?

I have CNC machine that I built as a weekend project, it uses GRBL 1.1 and a custom Atmega328p board that I designed. It is based on the grbl Uno adapter plus the laser capabilities that I added. At ...
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Two pin PWM signal to control solenoid/electromagnet

I am building a whiteboard CNC pen plotter for my classroom out of some old 3D printer parts, a Melzi board running Ramps 0.92 and Inkscape to generate the Gcode. I have the machine up and running but ...
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0-5V signal output to start 230V DC circuit

I would like to ask you how to solve my case. I need output from PC's paralel port (something between 0-5VDC and low current) to switch 230VAC circuit. There is 24VDC/5A PLC power supply also, so I ...
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2 votes
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35 views

Three-phase rotary converter wiring questions

I am installing a 30 HP three-phase rotary converter on a 200 amp service in my home shop. I intend to run a CNC milling machine with a 15 HP motor. I am using 2 AWG wiring in 1" shielded conduit ...
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2 answers
359 views

CNC feedback mechanism

The GRBL library for Arduino looks very comprehensive but I like to understand how things work before I try to build them. Something I don't understand is how these systems get positional feedback. I ...
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2 votes
1 answer
69 views

Help on translating 5V rotary signal output to interface with lathe's cnc controller!

I have a hall sensor (OH137 - open collector) as an index signal on my lathe’s spindle. I have the sensor pulled high by a 1k resistor and can’t change it because they’re both glued in epoxy. This ...
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Wiring an e-stop with secondary reset

How can I wire an emergency stop that requires a secondary reset before the circuit is closed again? I am working on a CNC, and am brand new to the electrical component of them. The problem I am ...
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Endstop switched

I have a cnc machine and I need to connect an end stop switched to the motor and stages. first I need a simulation for this, that each snd stop is connected to a stage (x,y,z) and when the switch is ...
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1 vote
2 answers
249 views

How best to connect two optical limit switches to share one I/O pin

I'm trying to build a CNC laser engraver using a scrap industrial CNC gantry as a donor. The system already has optical limit switches for the max & min on each axis. I can't use the current ...
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Is this the right way to connect a Brushless Motor Driver Output Signal to a CNC BreakoutBoard?

I will purchase a Spindle Brushless Motor Driver to drive my Lathe Spindle, and I need to know if I´ll be able to connect an output signal from the Driver to my CNC BreakoutBoard (BOB), which is a ...
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Why stepper motor is slow with A4988 driver?

I'm using NEMA17 17HS13-0404S1 stepper motors with Arduino CNC Shield & A4988 drivers but I think they're much slower than they should be. Hard to explain how slow they are but compared to Ender 3 ...
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5 votes
3 answers
1k views

Cut 3D chunk out of PCB?

I would like to cut a small square out of the middle of a large square PCB. The tricky thing is, I don't want to cut all the way through the board, just about half way. This would create a 1mm-deep ...
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can use these printer motors to made CNC machine? [closed]

can i use this motor to make a cnc plottor ? is there any way to make a stepper motor using this motor?
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1 answer
469 views

using a vibration / noise sensor as edge finder in a CNC machine

I have a desktop CNC machine which has just the basic functionalities like controlling the speeds and position with a somewhat reasonable accuracy / precision. I also have an edge finder which I can ...
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1 answer
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Building a CNC with external drivers - RAMPS needed? [closed]

Well, I'm upgrading a closed-source CNC machine with Arduino (and GRBL), but I'm confused if I really need the RAMPS board. I want to drive the motors with external drivers. I have a RAMPS 1.4 board ...
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620 views

Grounding the components of a DIY cnc machine

I'm in the process of building a DIY cnc machine. It already runs, but I noticed it has some interference problems (steppers act weird on occasions, the full graphic smart controller LCD has trouble ...
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How to use coordinate strip electrically?

I want to build simple CNC machine, via reusing printer head, connected to arduino. As per motion its all right: I use L298N dual driver, and can control movement direction and speed via PWM, setting ...
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2 answers
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How to regulate voltage of transformer output for nichrome wire

I have a basic CNC machine for cutting EPS foam which uses about 9.5in/23.5cm long straight 28 gauge Nichrome wire as the cutting element. The nichrome wire is powered independently with a 220V-36V 5A ...
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1 vote
1 answer
210 views

How to contol the height of blade in a vinyl cutter machine? [closed]

I have a machine that has 3 axis x,y,z. The machine is a vinyl cutter. The x and y axis are stepper controlled, but the z axis is a coil so my question is how does the manufacture control the z ...
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Building a water jet cutter using Arduino, CNC shield and GRBL firmware

I am building a water jet cutter using Arduino Uno and CNC shield for control. The CNC shield uses A4988 drivers to control the stepper motors. I uploaded the GRBL (for this shield) firmware to ...
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-1 votes
1 answer
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How does G-code determine what pins I used to set CNC motors at? [closed]

I want to develop a simple C# application to control a self-made CNC machine using Arduino Uno. I want to use G-code to accomplish that. Now what I don't understand is how G-code is interpreted in ...
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1 vote
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How to use less Bipolar Stepper-Motor Drivers

I make a CNC machine with lot of drivers (12) and the quality ones are quite expensives. As I never use all the motors at the same time, and the fact that the unused/resting motors can be off is not ...
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1 answer
263 views

EMI shielding for VFD and DC PSU's for CNC controller

The plan was to mount a VFD (Spindle) and (x3) 48V Power supplies on MDF and near it I want to mount 4 TB6600's for motion controlling a CNC machine. I would like to make it enclosed with some small ...
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2 answers
793 views

What are the advantages of pulsed laser

I'm talking about laser diode for engraving/cutting cnc. As far as I know led or laser diodes are often driven by pulse signals to enhance their performances. Please note I'm not talking about the ...
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Repair help. Mosfet keep shorting

I have "repaired" a cnc power nad speed control board from yoocnc (china) and it worked fine for a day. the next day the spindle just started running as power was applied. the mosfet was shorted, the ...
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2 votes
2 answers
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Stepper Motors getting very hot after use

I have a hobby CNC machine running with three cd drive stepper motors in it using a 2amp supply for all of them, it is run by Arduino uno and EasyDrivers. Suddenly I noticed them getting very hot, I ...
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1 answer
4k views

Power Supply for Nema 17 motors [closed]

I'm using below things to make cnc plotter and cnc lathe : 3x Nema 17 Motor, CNC shield v3, 4x DRV8825 driver, 3x Endstop, Arduino UNO Some where in the post I read that if there is a CNC with 3 ...
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1 vote
1 answer
639 views

Pc lpt (parallel) port input pin, how much current does it draw

I need some help to understand what's going on with my project: I am building an cnc machine and i use the parallel port to communicate with it... I use the native port to drive the motors and ...
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1 vote
0 answers
62 views

What power relationship (between active and reactive powers) should I expect from a CNC machine?

I have collected loads of power data from a 3-phase CNC machine and it all looks like this: The 3-phase active and reactive powers can be seen above, as well as the Q (reactive) - P (active) ...
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4 votes
3 answers
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Eagle/Flatcam/LaserCNC: How to have "open pad" for futur drilling

I'm using Eagle, flatcam and a CNC laser machine. My problem is when I'm trying to export my board, all my pads are filled ! It means, when my board will be engraved (chimical method), I will not find ...
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2 votes
1 answer
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Advice on precision CNC milling machines for PCB prototyping

I am an EE professor at an University and I was asked to provide a solution (machine) for PCB prototyping. Specs are milling down to about 8 mil (0.2032 mm) trace thickness, 8 mil trace clearance, 8 ...
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LED can't stop blinking (AVR-C)

So here is the basis of my code, I have an array of different instructions for the prescribed LEDs to follow. The led will blink for the prescribed number of times in an interrupt before they stop ...
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1 answer
2k views

Sending info from python to avr-c

okay so my situation is that i am working an avr chip which is the atmega 328p and what i want to do is i want to lets say have a user input in python lets say the user types in a string and from ...
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1 answer
806 views

Power Supply For CNC Setup

I can't quite wrap my head around the power requirements for a CNC setup i'm building. I'm using 3 x Easydriver 4.4 for driving the Sparkfun Stepper Motors. I previously used a 22 V 800ma Power ...
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2 answers
322 views

CNC stepper motor driving CC vs CV

I am trying to design a small CNC maching for milling PCBs. I am using unipolar stepper motors driven by a microcontroller, but I am unsure of what tehnique to use to drive them. I once read that ...
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2 votes
1 answer
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Any better alternative to produce PCB than UV etching

I hope this is an appropriate question to ask it here. I work for a small start up company that has a limited budget. We have UV box, etching tank, etc from manufacturer like Mega UK. Our problem ...
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