Questions tagged [cnc]
Computer Numerical Control: the computer or digital control of tools in a machine shop like lathes, mills and drill presses.
75 questions
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H-bridge transistors are too hot
I have built the following H bridge for driving my 48V 500W spindle for my DIY CNC Mill. The optocoupler part works well and I started to test the H bridge, however the transistors are heating up like ...
3
votes
2
answers
498
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How can I convert ±10 V input to 0-10 V w/ run/stop/reverse signals?
I have a CNC lathe and the DC spindle motor went out. It's too expensive to replace, so I'm going with an AC motor and VFD.
The original control outputs -10 V as full speed reverse, 0 V stop, and 10 V ...
-1
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0
answers
35
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stepper motor cable connection to enclosure
My cables (DB-15, GX16) come with wire ending. I do not want to insert the cable into the enclosure, but rather have connectors on the back panel for them.
Image source:
https://www.omc-stepperonline....
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0
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86
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Kicad and Flatcam - how to route internal cutout areas
I use Kicad for PCB design these days, and usually get the boards made professionally. However, sometimes I want something quickly, and if it's very simple or I just want a space model I sometimes ...
- 101
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28
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Flatcam creating command uncessesary M6
I create a cnc file from a gerber file, B-cu (bottom copper side).
When trying to mill this with Cancle, I get an M6 error.
Since this is only milling with 1 tool Vshape 20deg 0.1mm, I do not ...
0
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1
answer
43
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230V 3-Phase Power Supply for VFD and PSU Repair
I am repairing CNC electronics and need some lab equipment. I need a 3-phase, 230 V input for the power supply and VFD to debug them. Where should I look to get a supply for this? Is there something I ...
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2
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1
answer
144
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Identifying unmarked IC in CNC controller board
I have a Camxtool v3.5 CNC controller (similar to this, although this is v3.4) that has an unmarked IC that I haven't been able to identify:
The IC is connected between pin PB3 of the ATmega328P (...
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0
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Candle CNC shrink
Today I tried to use the CNC for my first PCB and the result was only 1/3 the size of the Eagle diagram I made. Where should I input the machine parameters to get a proper size PCB? The CNC is working ...
2
votes
1
answer
303
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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 ...
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1
answer
102
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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 ...
0
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0
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83
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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
...
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0
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118
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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 ...
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0
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251
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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 ...
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1
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162
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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 ...
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1
answer
610
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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 ...
3
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1
answer
2k
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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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1
answer
99
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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 ...
- 169
0
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0
answers
570
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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 ...
-1
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0
answers
43
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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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3
answers
418
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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 ...
0
votes
1
answer
549
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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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2
votes
1
answer
360
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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 ...
0
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1
answer
411
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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, ...
- 395
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2
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973
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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 ...
0
votes
1
answer
1k
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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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0
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1
answer
517
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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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1
vote
2
answers
88
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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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1
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201
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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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1
answer
220
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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
votes
3
answers
204
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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
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0
answers
74
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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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1
vote
2
answers
752
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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
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1
answer
119
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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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2
answers
4k
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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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1
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40
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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 ...
1
vote
2
answers
588
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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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2
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89
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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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0
answers
529
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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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3
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1k
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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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1
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76
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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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0
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1
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539
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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
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708
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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 ...
- 391
0
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0
answers
825
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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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1
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48
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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
1k
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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
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1
answer
257
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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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0
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1
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469
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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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votes
1
answer
263
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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 ...
- 15
1
vote
0
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44
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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 ...
- 11
0
votes
1
answer
333
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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 ...
