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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Unknown motor with continuity across all windings. Help identify star vs. delta

I'm converting an old milling machine (Optimum F40E) machine to be driven with a VFD, and I have it working. The head is a geared head, and with correct settings (torque compensation) in the VFD I can ...
Lee Hambley's user avatar
0 votes
1 answer
53 views

EMI issues with CNC TIG welding machine

We're having some super weird issue with a CNC TIG welder that we're building. To start the arc (and complete the circuit for DC TIG welding), bursts of high voltage (making a taser-like sound) at a ...
Wissam Kadamani's user avatar
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0 answers
57 views

Calculating spindle current if measuring 3 phase line current

I currently have a spindle that is being powered by a 3 phase supply. I am measuring the line current in each of the 3 cables using 3 current transducers. I am trying to calculate the instant ...
Matt's user avatar
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68 views

Why extending the wire of stepper motor leads to vibration?

I'm almost newbie in hobby electronics and I'm trying to extend the wires of my Nema17 stepper motor. (Model: Stepperonline 17HS13-0404S1, 12V, 0.4A) But somehow extension leads to vibration. It's ...
she hates me's user avatar
2 votes
0 answers
90 views

Adding PWM function to a XL Semi XL4015 5 A 180 kHz 36 V buck DC to DC converter to create a NUBM44 laser driver board

I am asking this question just to make sure I haven't missed anything important because I am at best a novice when it comes to electrical engineering. What I am trying to do is build a laser driver ...
Cameron A's user avatar
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0 answers
78 views

FlatCAM drilling: CNC tip goes away

I want to have the holes of my CNC machine circuit board drilled. I'm using FlatCAM 8.993 while doing this. After creating my CNC output from the settings, the numbers given are far from each other, ...
Mehmet Emin ARSLAN's user avatar
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0 answers
247 views

Driving 3V NEMA 17 motors with GRBL + CNC V3 Shield

I want to drive some motors using the GRBL + CNC V3 Shield. Seeing the specs, I see that it can drive four A4988 or DRV8825 stepper motor drivers. These drivers, are suitable for 8.2V~45V stepper ...
user1584421's user avatar
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1 answer
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CNC Servo System Grounding

Here it's a sketch of a simplified CNC servo system. The servo drives are non isolated (Digital GND connected to Power GND, drawn as GND) (My main question on the picture too) #1: Why some ...
Buruhazard's user avatar
0 votes
1 answer
528 views

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 ...
Sgele Mkhonto's user avatar
2 votes
1 answer
1k views

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 ...
Jeffrey Lawton's user avatar
1 vote
1 answer
83 views

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 ...
Steven Lutz's user avatar
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0 answers
504 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 ...
Juan Pablo Pino Bravo's user avatar
-1 votes
0 answers
43 views

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. ...
Muhammed Sevinçtekin's user avatar
-1 votes
3 answers
289 views

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 ...
Muhammed Sevinçtekin's user avatar
0 votes
1 answer
317 views

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 ...
PSz's user avatar
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2 votes
1 answer
282 views

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 ...
Daniël van den Berg's user avatar
0 votes
1 answer
287 views

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, ...
Guilherme's user avatar
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2 answers
694 views

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 ...
Max Peglar-Willis's user avatar
0 votes
1 answer
1k views

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 ...
David W's user avatar
0 votes
1 answer
402 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 ...
ma9's user avatar
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0 votes
2 answers
70 views

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 ...
Harry Braviner's user avatar
0 votes
1 answer
167 views

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 ...
Emre Mutlu's user avatar
1 vote
1 answer
180 views

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 ...
wcase's user avatar
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0 votes
3 answers
133 views

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 ...
Halford's user avatar
2 votes
0 answers
64 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 ...
Han Yolo's user avatar
1 vote
2 answers
608 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 ...
Peter Wone's user avatar
2 votes
1 answer
111 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 ...
Rodrigo's user avatar
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1 vote
2 answers
3k views

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 ...
Rulon Rock's user avatar
0 votes
1 answer
34 views

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 ...
Bader Khalid's user avatar
1 vote
2 answers
458 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 ...
Hades's user avatar
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0 votes
2 answers
80 views

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 ...
Rodrigo's user avatar
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1 vote
0 answers
462 views

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 ...
she hates me's user avatar
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 ...
Hackstaar's user avatar
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0 votes
1 answer
73 views

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?
ManulMad's user avatar
0 votes
1 answer
514 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 ...
Foad's user avatar
  • 223
0 votes
1 answer
613 views

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 ...
Fusseldieb's user avatar
0 votes
0 answers
791 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 ...
RunoTheDog's user avatar
0 votes
1 answer
48 views

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 ...
xakepp35's user avatar
  • 405
0 votes
2 answers
983 views

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 ...
John's user avatar
  • 3
1 vote
1 answer
247 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 ...
Ahmad 's user avatar
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0 votes
1 answer
428 views

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 ...
Yuri's user avatar
  • 15
-1 votes
1 answer
229 views

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 ...
Yuri's user avatar
  • 15
1 vote
0 answers
43 views

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 ...
Morpheus's user avatar
0 votes
1 answer
310 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 ...
MFX Workshop's user avatar
0 votes
2 answers
840 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 ...
Mark's user avatar
  • 1,179
0 votes
2 answers
1k views

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 ...
Hans Neve's user avatar
  • 103
2 votes
2 answers
5k views

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 ...
Udit Sarkar's user avatar
0 votes
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 ...
Shanki Bansal's user avatar
1 vote
1 answer
724 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 ...
Justin C's user avatar
1 vote
0 answers
67 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) ...
DimP's user avatar
  • 173