Questions tagged [machining]

Questions about shaping material with removing material from raw material, i.e. subtractive manufacturing. Posts may have [mechanical-engineering] and relevant material tag such as [steel] and if needed process tags such as [milling].

Filter by
Sorted by
Tagged with
2
votes
1answer
33 views

I have a small piece of stainless steel that I need to remove 1-2mm of material. The hardness is 200. What type of file do I need to get?

This is a part of a mounting system for an Olight pistol flashlight. The universal adapter that they include isn't so universal when it comes to a Canik handgun. I've talked to the people at Olight ...
2
votes
3answers
78 views

What is an acceptable tolerance for a non-engineering dimension

I have part that I'm dimensioning and setting tolerances on. Some of the dimensions/features have engineering requirements (e.g. press fit) and I have the tolerances set correctly (e.g. H7). But I ...
-1
votes
0answers
16 views

Which is a good cutting insert for toughened carbon steel material?

We are using a conventional CNC machine on which we intend to machine a with Ra value of 1.6 Material hardness is 55 HRc. Kindly suggest a suitable insert with tool signature.
1
vote
1answer
24 views

Boring bar holder for lathe tool post

I want to be able to hold a 1/2" diameter shank boring bar on my existing lathe tool post but don't know how to buy the correct one. The post we have is a Phase II 250-111: https://www.mscdirect.com/...
2
votes
2answers
31 views

Smallest possible elliptical hole

I am trying to fabricate a very small elliptical nozzle; if possible, 10um x 20um. I am almost certain that this cannot be achieved with regular machining. Ideally, the material would be corrosion ...
1
vote
1answer
26 views

From advanced prototype to low-volume production

So to the point. In our project (Robotics project) we mostly use sheet metal and PLA printed parts to build. But we want to level up and be ready for an advanced run and even low-volume production of ...
2
votes
5answers
83 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
votes
1answer
17 views

Uses of orifice in Water Jet Cutting?

I wonder whats the usage of orifice/orifice plate in Water Jet Cutting Machines. To increase pressure(due to a smaller diameter with respect to the entrance cross-sectional area) or to convert to ...
1
vote
3answers
96 views

Do the hole patterns drilled in laps really help ensure uniform expansion and contraction?

Some laps have patterns of holes drilled into them - two examples are below. In both cases the user claims that the holes (among other techniques) help ensure that the laps stays close to round when ...
0
votes
1answer
54 views

How to rotate the blade?

I have developed a design for a river cleaning machine which can cut and collect weeds. The problem which is facing is how to rotate the circular blade which is attached in front of the machine. I ...
1
vote
2answers
63 views

Hydraulic linear actuators as CNC axis instead of screws

Lately I've been watching some videos on machining and hydraulics as it always interested me. I was toying with the idea of building a budget CNC mill with threaded rod for the axes, but the issue of ...
0
votes
0answers
45 views

Fitting a sprocket on a small motor shaft

I have a bit of a newbie question. I've inherited a mechanical system, wherein the motor has a D-type output shaft with a diameter of 8mm. (https://www.ebay.co.uk/itm/DC-High-Torque-Worm-Reducer-...
-1
votes
1answer
45 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 ...
4
votes
2answers
68 views

Is my aluminium drill swarf okay?

So I've been drilling standard 1/4" aluminium in a small (250W) consumer drill press. I've used a little oil to help, but I'm not sure if I'm doing it right. The holes seem okay though. They're 10mm ...
0
votes
0answers
45 views

Cutting lego “+” cross-axle holes, lego knobs?

In short, I'm looking for ways to reasonably precisely machine a "+"-axle hole, Lego compatible sockets, Lego compatible knobs, Lego compatible round peg/axle holes, and other cutouts for Lego-...
2
votes
1answer
42 views

Why is the fluted edge of a twist drill bit sharp?

My intuition on how a twist drill bit operates is that the cutting is done by the end of the drill bit and that the fluted section carries away material as it's cut. When I look at twist drill bits, ...
0
votes
0answers
23 views

How can I model two attached rotating rings?

I am trying to model an object in which there are two rings who are attached to each other and can rotate independently along the Y axis (see attached image). The object needs to be machined and not ...
2
votes
4answers
216 views

When reaming a hole to fit a bearing, can I get an underfit by icing the workpiece?

It's my first time working with bearings, but this is a necessary part of my robotic arm project. I have some $10 bearings that are 24mm OD. I want to fit these tightly in a hole, ideally getting a ...
3
votes
1answer
120 views

What mechanism do I use for this pen-like design?

I am trying to make a pen-like product that moves out fluid from its tip for some special chores, but I am having issues about the motion of the clutch. The picture you see is a sectioned concept ...
1
vote
1answer
64 views

Visible markings for plasma cutting?

I'm new to plasma cutting with a hand-held plasma cutter (as opposed to CNC). Its straightforward to cut with a fence/guide and I am getting good results that way. However, when I want to freehand a ...
0
votes
1answer
85 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 ...
0
votes
1answer
80 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....
1
vote
1answer
55 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?
1
vote
0answers
32 views

Tolerancing considerations for temperature rated mechanical assemblies

I am currently designing a mechanical tensile testing setup to operate at different temperatures (-20 to 100 C) in a wet environment. I plan on machining two sets, one from stainless and one from PMMA....
1
vote
1answer
59 views

How to track parts through high-temperature oven and abrasive treatments?

I have been thinking of a problem and I would like to brainstorm about it with the community. Scenario: Machined parts going through termal treatment in an oven and further abrasive treatments. ...
0
votes
1answer
27 views

meaning of 1“ baseplate fitting to mount to a standard 1” feedthrough port

I was looking at this page to figure out how I would install a manipulator onto my chamber. It says 1" baseplate fitting to mount to a standard 1" feedthrough port" So, I would have to have a ...
3
votes
1answer
44 views

Speed and Feed values for log slitting of paper

Context: I have a paper roll of about 8 in (20 cm) diameter mounted in a 3 inches core (7.62cm). Its length is about 1.2 m. The paper is bond of 95 g/m2. I have to cut slices of it of about 10-18 cm ...
2
votes
1answer
385 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 ...
1
vote
0answers
70 views

How to calculate the thickness of the residual stress layer generated by a machining process

Machining a metal part will create residual stresses on its surface due to the deformation that the process introduces to it, is there any model to estimate how thick will this stress layer may be?
1
vote
1answer
339 views

Tolerance on dowel pin length

Is the length of a steel dowel pin standardized to a certain tolerance? McMaster-Carr provides tolerances on the diameter of dowel pins but not the length. In the event where I want a dowel pin to fit ...
1
vote
0answers
28 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 ...
1
vote
2answers
101 views

I have an unidentified press-fit nut that I need to reproduce, can anyone tell me how to find this?

I received these fittings as part of a package, but now we need more of them. Can anyone identify this assembly, or even better help me learn how to recreate it? My coworkers and I are stumped. ...
1
vote
1answer
68 views

Blind bearing bore design

I've tried to find some rules of thumb about this without any luck. I'm designing a part with a blind cartridge bearing bore. It's a 624 bearing (13x4x5) and the fit size guides point me to a ...
1
vote
3answers
207 views

deformation / bending problem with anodized aluminium panels

I recently had a machine shop machine some aluminium panels (3mm thickness) which I then sent to an anodizing shop where the panels were bead blasted and anodized. When they came back they were ...
1
vote
1answer
47 views

Document Feathering Tolerance on Drawing

I am recreating an engineering drawing package from old quotes for a large assembly. In the quote they say "All length edges not to exceed 1/32" deep feathering". For some context this is for a bunch ...
2
votes
3answers
122 views

Understanding metalwork manufacture — How are Purchase Quotations prepared?

I have been involved with a number of metalwork design projects lately and I'm increasingly finding myself asking for quotations for small prototype runs (often one-off jobs) to verify the validity of ...
0
votes
1answer
53 views

Calculating the angles for gear cutters

I need to design some custom involute gears for a project that I am working on and this is my first dive into gears. I worked out how to calculate the size of gears by the required numbers of teeth ...
2
votes
1answer
47 views

Gear cutting books in metric system

I am learning about gears, hobs and things of this sort. The main book is the machinist handbook which does a pretty good job of explaining things but things are in imperial scale. This causes me a ...
3
votes
3answers
207 views

Is there an intuitive explanation for the Kinematic Viscosity unit of mm^2/s?

I've learned that a high viscosity means that the fluid is more thick. Dynamic Viscosity thus represents the resistance to shear forces. Presumably, higher resistances are represented by higher ...
0
votes
2answers
172 views

How is sand blasting different from abrasive jet machining

All I know is sand blasting is used for cleaning and etching purposes and abrasive jet machining (AJM) is used for making cavities and slots. But I think AJM can well also be used for cleaning and ...
0
votes
1answer
958 views

Circular keyways - advantages / disadvantages?

What are the advantages and disadvantages of using circular section ("Scotch") keys, keyseats and keyways? I am not referring to Woodruff style, I am only interested in the type where the key itself ...
1
vote
2answers
105 views

Increasing the stiffnes of a structure by adding stiffener, but at the same time reducing main surface thickness

Let's say I'm designing a table surface which has to be stiff, rigid, but at the same time, not too heavy. It is rectangular in shape and ratio of length:width is quite large. It is only supported on ...
1
vote
2answers
742 views

Part to “increase” the diameter of a small shaft, what is is called?

In my lab we have dressing tools for sharpening grinding wheels. The tools are diamonds mounted on a steel shank and the shank fits into a custom holder with a set screw in our machine (pictured). ...
10
votes
7answers
2k views

How to make factory machine hard disk drive more durable? How much its estimate life span?

I wonder how can I make hard disk drive more durable? Specifically, I works in a factory environment. And almost every few months, hard disk drive in some of the factory machine are corrupted, and ...
0
votes
2answers
248 views

Cutting Small Stars From Sheet Metal

I have a project where I need to cut a typical 5 point star shape (i.e. ★) out of brass sheet. The stars are small (~8mm across) and in high quantities. I was thinking of making a punch and die of the ...
-1
votes
1answer
499 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.
3
votes
2answers
2k views

Hand thread taps for stainless steel

I'm finding myself doing quite a lot of thread cutting in stainless steel lately, particularly 304 and 316, often these are moderately deep threads ~ 25 mm or so and at M12 it is becoming a bit of a ...
1
vote
0answers
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"...
1
vote
1answer
72 views

What are reasons to use cutting speeds different from recommended? [closed]

In my experience, many companies do not use the recommended cutting speeds for materials. In general, it seems they opt for lower cutting speeds. Is there a reason they typically do this?
1
vote
1answer
108 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 ...