Questions tagged [cnc]

Computer Numeric Control (CNC) is the automation of machine tools that are operated by precisely programmed commands encoded on a storage medium (computer command module, usually located on the device) as opposed to controlled manually by hand wheels or levers, or mechanically automated by cams alone. Most NC today is computer (or computerized) numerical control (CNC), in which computers play an integral part of the control.

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1answer
46 views

Is G-code used also in NC or just in CNC machines?

I am trying to really understand the difference between NC and CNC machines (not just to see the "old dark-green display" to know that it is an NC machine). On the web people are saying that ...
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33 views

Did I buy the wrong SBR rails? They don't seem to attach or align

I have bought some SBR12 rails and bearing blocks in an attempt to make a fancy flatenning jig for my router. I haven't been able to see 100% everything that other people have done on the YouTubes due ...
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18 views

Is it possible to have a reference pulse interpolator for a CNC machine with dc drive?

Is it possible to have a reference pulse interpolator for a CNC machine with a dc drive? it should work with alternating current drive but I am not sure about the direct current drive. please help me ...
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14 views

Mill spherical recess using Fusion 360

I am trying to mill a spherical recess into stock on a 3-axis mill. I am generating the G-code in Fusion 360. I need some guidance on the best tool path generation option in Fusion 360 as every ...
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58 views

Active noise canceling for CNC enclosure

this is my first post here! I wanted to share my ideas for this and get some input on them. My parents were kind enough to let me put a cnc machine in the loft. (shapeoko 3 xxl) In order to make them ...
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2answers
70 views

Professional threaded insert in plastic?

I'm getting some plastic parts (made with HDPE) CNC machined. A few of these parts require the addition of threaded inserts. I've printed the parts myself using a 3d printer and when I add the ...
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1answer
42 views

Software correction of CAD or Gcode based on machine measurements

I own a CNC machine (Shapeoko 3 XXL) which I use to make projects that require good 90° angles, and I have been through several steps of improvement/calibration of the machine that are described in ...
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50 views

Design a Jig and Fixture for 3-axis CNC Milling Machine

Newbie Here!!! This is my assignment task. I am required to design a Jig and Fixture for 3-axis CNC Milling Machine. The workpiece will be a simple aluminium block and it will be cut and shaped into a ...
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33 views

What is an "Optical Axis Rod"?

I'm in the process of designing a CNC/3d printer and I came across the term "Optical Axis rod" which seems to be the "standard" rod printers like Prusa use. But I can't find ...
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2answers
99 views

Why are entry-level CNC mills cheaper than entry-level manual mini mills?

Having used some big, old, manual Bridgeports in school, I was looking into getting a small mill (manual or CNC) for hobbyist home use on metal and wood. I was surprised to see many CNC milling kits ...
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14 views

Grinding Forces Problem - CNC on Zerodus

We, my colleague and me have follownig problem and now weIwanted to ask if you can provide us any help. It's the first time we are posting in this forum, so we are thankful for any ideas or input ...
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1answer
34 views

How to calculate value of force required to move CNC rounter? [closed]

I want to design CNC rounter. I want to know how much force required to move router in to material. How to consider this. I guess there are many factor like Material Feed rate Depth of cut number of ...
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33 views

Mdf cutting seems to require absurdly low spindle speed for the right chip load

I've been trying to calculate the correct spindle speed and feed rate for my setup and it took me to some absurd settings. Can you do the math and check the sources hand in hand with me, plase? My ...
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1answer
49 views

Precision of a steeper motor and gears vs multiple motors

We are a student team trying to design a low cost CNC plasma cutting machine. The CNC will be a table with two rails and a bridge moving on them in which the head of the plasma torch will be. Now we ...
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1answer
53 views

CNC side linear rails

I've been wondering why most (hobby) CNC machines have two actuated linear rails like this: Besides the extra force for moving the spindle, is there a need for both rails to be actuated? Could the ...
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1answer
36 views

Vertical cnc or skipper

We are going to be increasing our capacity in our component company next year and I am looking for a little advice. We are thinking about using our loader/unloader CNC for cutting part outlines only ...
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5answers
107 views

Low cost molds. Can such molds be produced?

I recently found the following link https://anglingai.com/224b-4-4-blood-line-swim-bait-mold/. There you will see that they sale hundreds of different aluminum molds related to fishing. These molds ...
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5answers
316 views

What is a purpose of learning G-code?

I might be wrong here. The solid modeling done in CAD like Catia, NX, Solidworks,etc can be taken as input in CNC and the desired shape and size of piece can be obtained.The CAD itself convert the ...
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1answer
118 views

Solidworks hole table export data format

I'm trying to help a student with a project. The task is to generate CNC G-Code from a Solidworks hole table export (CSV) using VBA. The problem is the export format is going to be a difficult to ...
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1answer
293 views

Is it possible to grayscale a MPO file (3D camera) for a CNC carving

I had/have a 3D camera back in the day, and I gotten a few pictures. I kinda stopped using it since there wasn't anything I could do with the MPO files. However, the camera might gain a new life if I ...
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3answers
51 views

Where to find springed pegs with screws for a CNC mill?

I need to hold small pieces of wood in place to be drilled by a mini computer-numerical control (CNC) mill. I have a book stand (no affiliation) that has two "springed pegs" fastened with screws: ...
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1answer
306 views

Can a 3018 or 1610 CNC router cut aluminum (foil)?

I'm wondering if anyone has any experience cutting aluminum foil on a very cheap CNC or laser cutter. I have a lot of 3d printers but haven't yet purchased a CNC router. I am talking about aluminum ...
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32 views

Getting From 3D a model to CNC router

Apologies if this is not the correct SE for this sort of question. But, this is the only place I've seen an appreciable number of CAD questions. If this isn't appropriate for engineering.se, a pointer ...
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35 views

Permission Denied copying to (User Data) dir -Haas Next Gen Control

We recently purchased a new Lathe - Haas with Netshare, Next Gen Control. We are copying a file to the Haas Drive's (User Data) folder from a network PC. The problem we're seeing is random and ...
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26 views

Limited resources for learning Fanuc Macro B programming, I need some direction as to how people learn this language

Why is it that the only 2 books on CNC macro programming are by Peter Smid and one S K Sinha. Am I looking at this the wrong way? What am I missing? Is Macro programming one single thing that can be ...
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1answer
86 views

Automating the Coolant Top-Up for CNC Machines

I am designing a liquid dispensing system for CNC machines that will top-up a mixed solution of coolant & water at the required concentration. Present concentration in the machine sump will ...
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1answer
453 views

Curious of drawing a hole for M3 countersunk screw, 5.5mm or 6.5mm?

Hello all I am drawing a hole for M3 countersunk screw(flathead) I have checked the specs online the diameter of the head is largest 5.5mm thick 1.65 90degree But when I draw a 5.5 hole 90degree it's ...
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1answer
64 views

How much space should I leave between round bushing and the rotating parts to minimize the play?

Hello everyone I am designing a parts that needs to rotate so I am planning to insert a round bushing. But I am curious of how much space I need to leave between the round bushing and the parts that ...
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2answers
61 views

CNC round-over bits with thin shank

I want to use a round-over bit on a CNC router after cutting a profile with a 3mm (1/8") bit. So the round-over bit needs a shank thinner than that. I could only find shanks with 6mm (1/4") diameter. ...
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1answer
535 views

Scalable alternatives to CNC router and laser cutter

I am doing calculations on costs for alternatives for manufacturing this children's toy I invented, a puzzle where letters in plastic fit into wood. I have been using a CNC router to carve subtract ...
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1answer
108 views

Mechanical tolerances on a CNC machine

I have a project which involving several mating parts and also shaft guided through bearings, my issue here is that I don't have much experience with tolerances and manufacturing processes and I ...
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0answers
24 views

Best way to resume aborted cnc job without endstops by zeroing in on known hole…?

I have a very simple little T8 CNC without endstops that I use for PCB's. After a failed drill job, the position of the machine is lost and I would like to resume the job. The machine is running GRBL ...
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1answer
152 views

System for aligning/truing objects to each other in a plane for CNC machine

I apologize for the vague title. I know my problem, but I am having problems describing it in concise words, which is making it difficult for me to google. I am building a CNC machine that is similar ...
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1answer
103 views

Tapping small hole on titanium

So I want to tap a super small hole on grade 5 titanium alloy with M1.8x0.2 (which should be possible according to this Quora's answer. But is there any tap available for me to do this job? I mean M1....
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53 views

cnc z axis motor huming when homing

I am using GRBL and UGS with an arduino uno and its CNC shield. Once I send the $H command, the z motor is moving a little bit and then it goes crazy. I mean it's starts to hum and doesn't move ...
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1answer
62 views

What is relief amount in grooving operation

Can somebody please explain what relief amount at the end of cut in a grooving operation on lathe is?
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1answer
43 views

Weird texture on faces when using Shapeoko CNC

when I run an operation that mills a face down on my CNC, it leaves this weird texture. It's hard to describe, so I attached an image. What is it caused by and how do I fix it?
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1answer
544 views

End mill vs Drill Bit Flute Geometry

What is the fundamental difference between the flute geometry of an end mill as opposed to a drill bit? Obviously drill bits are not intended to cut horizontally so what difference about them makes ...
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31 views

How can I get the spindle driver current internally?

I am working on monitoring research. During it I found a lot of papers use Hall effect sensors to get spindle current. However some of them are accessed internally to spindle driver current. I will be ...
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1answer
144 views

How Can I do punching of 0.22mm in stainless steel sheet (Sheet thickness 0.5mm)

Wanted to press punching of 0.22mm dia (Bottom) and on (top) 0.6mm dia Please suggest how can I make such die?
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2answers
862 views

Looking for program and file format for CNC Milling

I am creating subwoofer boxes out of MDF or Baltic Birch. My local makerspace has a CNC machine. I am going to make all of the cuts with it. What software is generally used or will work to get a ...
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1answer
536 views

Disadvantages of wire cut cnc edm

Before purchasing Wire cut cnc edm I just wants to know about disadvantages of it over using mechanical lathe machine.
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26 views

How do I configure g-simple so it does not use G81 code?

I have a CNC that does not understand the G81 code for drilling. G-Simple looks to be configurable but I am finding it difficult to find information on it. It looks to have a "USE" command with a "G81"...
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1answer
154 views

Milling aramid composites produces unwanted fuzz at surface

I use standard end mills for cutting carbon fibre sheets. Generally the cutters are 2 to 3 mm diameter, with a flute length of about 8 mm. I use 3- and 4-flute end mills. These work quite well if they ...
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1answer
403 views

CNC engraving single line fonts [closed]

I want to engrave some letters from a 2D dxf file with single stroke fonts. Is this easy to do in most CAM software? I have not decided what CAM software to use yet, because the ability to do single ...
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2answers
244 views

Design for CNC -cut sheet+bolt connection

I'm making a corner shelf for spare toilet paper from a thin plywood sheet, say 5mm. I want to connect the plywood to the corner walls with a bolt/nut joint like this: My question is -- how do I ...
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3answers
254 views

CNC milling of large cutouts

I have a part made from 5mm alloy plate and I need to cut a large cutout in the middle of said part: As seen above I intend to use a small cutter to cut through the stock (not necessarily plunging as ...
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2answers
277 views

What resolution (pixels/mm) should I use in SVGs for CNC

I am planning a mechanical 40% keyboard build and are coincidentally on the home stretch of a homemade CNC project. The only thing the CNC needs to do for the keyboard project is to drill 7*48 holes. ...
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0answers
105 views

Standard parameters for machining aluminium?

Sorry for the weird question but I was wondering about the standard machining parameters for Aluminium (if there is even a standard). Particularly the values for a CNC process (preferably in SI) for a ...
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229 views

How to cut evenly spaced uniform holes in a plate of metal?

I've looked everywhere for this seemingly simple question, but I cannot for the life of me find out how to easily cut a specific amount of holes in a plate of metal with my cnc. Am I going to have to ...