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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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1answer
324 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 ...
0
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1answer
34 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 ...
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0answers
54 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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1answer
41 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 ...
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2answers
111 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 ...
1
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1answer
63 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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1answer
69 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 ...
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1answer
61 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 ...
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0answers
38 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 ...
0
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1answer
138 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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0answers
69 views

High Voltage Surge From CNC Router Spindle

I am thinking about building a cnc router with an ebay 400w spindle and the motor of choice. My question is, will any significant high voltage surge be created by the motor that could possibly fry a ...
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2answers
406 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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2answers
506 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 ...
2
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2answers
3k 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 ...
0
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1answer
3k 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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1answer
361 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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0answers
57 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) ...
4
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3answers
750 views

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 ...
2
votes
1answer
1k views

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 ...
0
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1answer
156 views

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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1answer
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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1answer
719 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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2answers
171 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 ...
2
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1answer
1k views

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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1answer
3k views

Difference between half stepping and full stepping

I am currently making a stepper motor controller based on this schematic however I was wondering about the difference between half and full stepping and what would be the best method for a stepper ...
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2answers
2k views

Stepper motor failing. Electrical interference?

Update: This question is already so long, I'm hesitant to add to it but it occurs to me to ask if electrical interference between the stepper motor wires could cause this sort of behavior (motor ...
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2answers
219 views

Using a function within a function

Hi I am a novice at using stepper motors, and I am learning as I go on. However, I was wondering if there was a way to delay the steps between each step in my stepper motor without using the delay, ...
1
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1answer
6k views

G-code compatiblity with H-bridge L293d

I'm trying to make a 3 axis bipolar stepper driver and I think using L293Ds and Arduino is the best cheapest option. I have seen people using grbl to run their steppers easily but with grbl they ...
3
votes
1answer
6k views

L297 stepper motor driver inhibit issue

I've knocked together a L297/L298 stepper motor controller and have a problem with what seems to be half the output. On the final 4 output lines after the L298 and diodes, I have 2 bipolar LEDs to ...
5
votes
1answer
1k views

Eagle V6 and CNC router

Any one used Eagle V6 and CNC router to produce prototype PCB boards. I have a high res CNC router HighZ1000-s/T which accepts G-code and HPGL. I am pretty sure that at the end of the day it will well ...
8
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3answers
3k views

A CNC machine for PCB manufacturing [closed]

I'm looking for a CNC machine that can be used for different PCB manufacturing tasks such as: Drilling PCBs (using a rotating head) Pick and place (to assemble PCBs) Soldering This CNC does not have ...
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2answers
789 views

Continuously Measure 3-Phase Motor Current

What methods are there for continuously monitoring the current in a 3-phase servo motor for a CNC machine and giving an alarm when the current is less than some value?
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1answer
142 views

Upside down printing

I am working on a project to print and CNC PCBs double sided simultaneously. The design for this project would require me to install my printer upside down. Can anyone think of any part of the printer ...
2
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2answers
409 views

Gear maker with 2 stepper motors

I would like to make a simple 2 axis CNC machine to create gears. One stepper motor could spin the gear, and the other could move a drill bit in a single axis. On ebay, I can find double h bridge ...
3
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2answers
5k views

EMC2, Arduino & stepper motors - Have I got this right?

I'm building a CNC mill based on Patrick Hood-Daniel's machines I'm also playing with Arduinos, and I'm beginning to wonder if I have this right: I have 5v 1A steppers. I'll be using EMC2 (Linux-...
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3answers
2k views

Which would better suited for a CNC drilling machine: gerber or gcode?

I am planning to develop a CNC drilling machine for a college project. The idea is to export the hole coordinates and drill size directly from a .brd file on Eagle, which will later be read by an MCU ...