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.
86
questions
0
votes
0
answers
18
views
Method to calculate required gear size and teeth size for a rack system for a certain amount of travel?
high school amateur engineer- and first-time poster- here. I'm making a Nerf automatic springer system, and I want to model it. However, I don't know what size rack and gear system I need. I need 60 ...
0
votes
1
answer
54
views
What is the hole tolerance in hand tap guide?
What is the tolerance for through hole to match the UNC 1/4-20 tap ⌀ 6mm? (tap shaft diameter ⌀ = 6mm) I want to make the diameter of the hole such that the tap stands in the hole and doesn't fall ...
- 103
0
votes
0
answers
61
views
Gcode coordinate transformations relative to rotation axis
I've tagged this as CNC, though I recognize that it is likely more of a math issue (which also explains why I am having trouble with it!).
I'm using a 4-axis CNC that contains two rotary axes. It is ...
1
vote
1
answer
58
views
150W laser cutting various materials
I have a few materials that I would like to get cut (in precise shapes that I cant do on a saw), these are
Quartz glass (1mm thick)
alumina wafer (1mm thick) (AL2O3)
copper coated alumina (2mm thick)
...
- 165
1
vote
1
answer
81
views
Workholding vacuum only on a portion of the workpiece
Consider an almost-rigid part on a vacuum table. There is a flat gasket underneath the part that exposes some portion of the bottom side of the part to vacuum. Let's say 50% of the bottom surface is ...
- 13
0
votes
0
answers
63
views
Some questions about linear rail systems
there are many linear rail system configurations. Some with only one lead/ball screw in the middle and a moving platform with wheels aligning outside/inside/on top of one/two framing rail(s). Others ...
- 131
0
votes
1
answer
77
views
Choosing Between CNC Lathe and Mill for my 3D Parts
I am on the verge of producing two parts in CNC Type III anodized aluminum, and was wondering what all your thoughts would be on whether to produce the parts on a CNC lathe or a CNC mill.
It is quite ...
0
votes
0
answers
31
views
Fabricating a Strong Hub Shell for a Bicycle
I'd asked this question over at SE Bicycles but they think this is more an engineering question.
The flange on my hub broke and I'm having to get one fabricated. The part is actually a cage that ...
- 101
0
votes
2
answers
51
views
Fabricating a Strong Hub Shell for a Bicycle
I'd asked this question over at SE Bicycles but they think this is more an engineering question.
The flange on my hub broke and I'm having to get one fabricated. The part is actually a cage that ...
- 101
0
votes
0
answers
30
views
How do I unminify a DXF file that appears to be minified?
I have tried so many different programs to convert this file to correct, but what I have is a DXF of an eagle. It appears to be minified in some fashion or created in some non-standard CAD program. ...
0
votes
1
answer
32
views
High RPM CVT for Spindle Motor
I have been messing about with a 20k RPM spindle motor and want to try to have some more low end torque. I was thinking about using a belt or chain CVT so I can smoothly change gear ratios but is ...
0
votes
0
answers
44
views
Issues communicating PoKeys57CNC and Mach4 running on Windows 11 Home PC in Custom Shell Kiosk Mode
Some background Information
I am using a Windows 11 Home PC to control a plasma cutting machine. The windows 11 machine uses Mach4 as the interface for controlling the plasma cutter and a PoKeys57CNC ...
- 1
0
votes
0
answers
26
views
What is the smallest standard CNC tool holder
I am looking at making a small CNC drilling machine for light duty PCB drilling. I would like to include a tool changer. I've been looking at tool changers and tool holders and they all seem massive ...
- 101
0
votes
2
answers
81
views
Is it acceptable to use a hand reamer on an X-Y CNC machined hole?
I would like to seat some bearings into a piece of aluminum, and I only have access to a small CNC machine. The CNC has ball screws and is calibrated to maybe 50um error in the actual travel on x and ...
- 273
0
votes
1
answer
51
views
What's the best way to zero a mill using a hole on the SIDE of the part
Lets say I have a block of metal clamped in a vice on my mill, and that part has a hole in the face that's facing me (parallel to the Y axis).
What's the best way to zero the X axis on that hole? The ...
- 1,991
1
vote
1
answer
53
views
'Know how' requirements for CNC / lathe manufacturing for open hardware projects [closed]
I've been asked to peer review a paper where the authors claim to be presenting an open source hardware item that is to be manufactured of aluminium using "CNC milling machines" or "...
- 115
1
vote
1
answer
104
views
Cutting carbon fiber plate with a sub-mm end mill
I have a 2 mm thick high-quality carbon fiber composite sheet. I want to cut a shape in it with a 0.8 mm diamond flute end mill. I need a cut this narrow because of the shape's detail. The shape's ...
- 126
0
votes
1
answer
55
views
Automatic letter connection for plasma cut parts with nested holes
Something I'm consistently running into as an issue is connecting letters so they don't fall out or leave a missing unconnected hole in a letter that is cut out of metal. Is there a way to ...
- 101
2
votes
1
answer
24
views
Asymmetrical collet nut snaps end mills
Could you clarify my suspicions. My spindle (HY HUANYANG, model: GDZ-80-2.2A) has come with a collet nut which has bizarre asymmetrical form of the supporting ring inside it (the ring for collet ...
0
votes
0
answers
60
views
Which CNC gantry support shape is more ridgid?
I'm in the process of designing a small CNC. There are two styles of side plates for supporting the gantry. The first one has an angled corner cut on the front, while the other has a backslash shape. ...
- 160
1
vote
2
answers
69
views
Why continuum robots aren't common on CNC machining processes?
So, I was searching on google/youtube about minimally invasive procedures and its tools to reach deep and delicate spaces of the human body, and it came to my mind the possibility of using it for CNC ...
- 51
0
votes
2
answers
1k
views
Reasonble position tolerance for 1.5mm dowel pins?
I am quite new to CNC machining and want to design two parts which should be accurately aligned with each other. I searched online and many people suggest the use of two dowel pins to align the parts, ...
- 101
0
votes
0
answers
256
views
I am getting error "G-code error: Bad character '\357' used" on my tormach 440 after I import gcode, why is this happening?
I am getting "10:39:49 | G-code error: Bad character '\357' used" in my class's Tormach 440 console when I import my code. Does anyone know any potential causes to this?
Edit: I don't know ...
- 1
0
votes
0
answers
411
views
Calculation of Cutting forces (tangential , feed and normal) in CNC Milling Process
I am doing my fyp project on 5 axis cnc milling machine.I need to calculate forces on each axis as mentioned in the below picture
I first calculated spindle power from https://www.machiningdoctor.com/...
0
votes
1
answer
100
views
What process is involved in freeform 3D tube bending?
I have seen 3D freeform tube bending in videos such as this, this, and this. I would like to ask what process is involved in such machines. I can see a swivel mechanism used for bending. What is it ...
- 101
0
votes
1
answer
2k
views
How to interpret general tolerances (e.g., ISO 2768)
I am quite new to mechanical engineering, but currently working on a project which I eventually want to sent to a CNC service for machining. Many services I found can manufacture to, e.g., ISO 2768-m ...
- 101
0
votes
0
answers
34
views
Handling bad g-code in typical CNC machines based on G02 example
I take the following example g-code
https://howtomechatronics.com/tutorials/g-code-explained-list-of-most-important-g-code-commands/
...
- 101
0
votes
0
answers
59
views
Does there exist a type of metal serrated sheet to place between two mating surfaces?
I'm trying to design a bolted joint between 2 aluminum members that will not shift in sheer under vibration loads.
The two straight members form a cross shape. Right now there are simply tight ...
- 1,991
0
votes
0
answers
46
views
Machining: Seeking Porting Tool for Milling Female 37deg Flare Ports
Been looking for a COTs carbide/ HSS cutting tool for milling standard 37 deg flare fluid ports, but am struggling to find anything applicable. Since these are common enough fluid fittings, I figure ...
- 140
0
votes
1
answer
20
views
Disk of solid wood debris on a 0.8 mm end-mill
The machine makes a cutout in a 6 mm-thick piece of hard maple using a 0.8 mm end-mill.
The end-mill accumulates a quite solid disk of wood debris. It has the consistency of soap and looks like a fine ...
- 126
2
votes
1
answer
414
views
Actual Chip Thickness Calculation for CNC Machine Endmills
Have a look at this image:
this image is from: https://www.guhring.com/Tech/endmillcalc
I would like to know how the formula for the "Actual Chip Thickness" is done
In this case, it is 0....
- 141
0
votes
0
answers
53
views
Which method is suitable for manufacturing this small scale geometry?
I want to have a channel manufactured in the dimensions shown in the picture. Which method is suitable for it. I think CNC can not achieve to work in such small scale. That rectangular prisms with 1....
0
votes
1
answer
134
views
Max length of 12mm OD steel rod for CNC axis [closed]
Standard rod used for CNC guides, outer diameter: 12mm.
Material: Ck55 steel, hardened to 60 HRC (according to store)
What would be the maximum length I can have before the rod starts to bend?
The ...
- 103
0
votes
0
answers
56
views
Does this CNC machine exist?
About ten years ago I had an idea for a cnc machine that was meant to basically use multiple axis to airbrush finished milled or printed 3d objects. I still have my detail drawings i worked up for it.
...
-1
votes
1
answer
162
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 ...
- 137
2
votes
0
answers
61
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 ...
- 121
2
votes
0
answers
23
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 ...
- 422
1
vote
0
answers
392
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 ...
1
vote
2
answers
225
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 ...
- 11
0
votes
1
answer
56
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 ...
- 141
1
vote
0
answers
126
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 ...
- 11
2
votes
0
answers
92
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 ...
- 159
2
votes
2
answers
149
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 ...
- 123
0
votes
1
answer
129
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 ...
- 133
1
vote
1
answer
58
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 ...
1
vote
1
answer
215
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 ...
- 1,033
-3
votes
1
answer
60
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 ...
- 25
2
votes
5
answers
156
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 ...
1
vote
5
answers
391
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 ...
- 133
2
votes
1
answer
289
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 ...
- 10.9k