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].

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1answer
49 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 ...
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3answers
42 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 ...
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0answers
31 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-...
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1answer
36 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
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2answers
45 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 ...
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0answers
30 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
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1answer
40 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, ...
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0answers
21 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
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4answers
99 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
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1answer
83 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 ...
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1answer
59 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 ...
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1answer
50 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
40 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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1answer
46 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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0answers
29 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....
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1answer
53 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. ...
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1answer
26 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
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1answer
38 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
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1answer
250 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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0answers
68 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?
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1answer
261 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 ...
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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 ...
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2answers
90 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. ...
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1answer
49 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 ...
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3answers
133 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 ...
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1answer
42 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 ...
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3answers
116 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 ...
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1answer
42 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
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1answer
43 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 ...
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3answers
166 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 ...
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2answers
155 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 ...
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1answer
638 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 ...
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2answers
93 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
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2answers
518 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). ...
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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 ...
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2answers
182 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 ...
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1answer
424 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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2answers
1k 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 ...
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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"...
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1answer
70 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?
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1answer
95 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
52 views

Machine that can paint a bulk of small objects all over [closed]

What type of machines are used to paint a bulk of small objects all over... things like buttons, keys, ping pong balls, paperclips etc.
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1answer
174 views

How do Cogs and belts work? / Cogs and belts in an ICAS exam

Does the left red wheel turn in the same direction as the leftmost orange wheel?If so P and S go up? If not, Q and S go up? My reasoning: If so Leftmost orange cc Left red cc (by assumption) ...
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0answers
64 views

How much time is needed to cut steel?

A sawblade cuts a piece of steel which has a rectangular profile with height $h$ and width $b$. The length of this piece is given by $\ell$ (not relevant for the cutting process). I have a sawblade ...
4
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3answers
169 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 ...
2
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0answers
45 views

How do I implement scientific experiment to derive a equation called Gerber Line? [closed]

How do I implement scientific experiment to derive a equation relevant to subject of stress and fatigue called Gerber Line equation? May you also provide some historical context to that?
3
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2answers
55 views

Which material is suitable to be fiiled in a thin-walled workpiece to increase the rigidity during the machining process?

My client is aksing me if I can manufacture a small but long strip-shaped aluminum-alloy (7075 T651) part. The sectional dimension is about 15mm by 12 mm and the length is about 1000mm. Ideally, this ...
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0answers
86 views

Lead calcuation for spiral bevel gear

I want to machine a spiral bevel gear on a manual universal milling machine using a involuter gear cutter. I also have a differential indexing setup for this job. But the difficulty I am facing is ...
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2answers
4k views

Accurately measure a bolt hole circle?

I need to accurately measure (+/-0.25mm) the bolt hole circle drilled into a heavy metal plate. There are three holes on one plate and nine holes on a second plate. The plates are approximately 300mm ...
1
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1answer
869 views

Hand-pressed metal stamping - fishing spinner blades [closed]

I want to stamp my own fishing spinner blades. They look like this: http://lurepartsonline.com/Online-Store/Colorado-Blades/Premium-Finish-Colorado-Blades.html Specs are usually 1mm thick, 3x2" ...