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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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20 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
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1answer
42 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
17 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
29 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
52 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
58 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
31 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
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0answers
23 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
73 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
29 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
57 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
33 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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2answers
81 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
34 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
30 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
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3answers
109 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
113 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
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1answer
259 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
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2answers
73 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
286 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). ...
9
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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 ...
0
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2answers
110 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
306 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
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2answers
639 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 ...
2
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0answers
24 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
61 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
75 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
46 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
108 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
60 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 ...
5
votes
3answers
106 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
42 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?
4
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2answers
48 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
57 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 ...
0
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2answers
3k 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
543 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" ...
2
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1answer
160 views

How can I drill a long, narrow hole into the end of a steel circular bar?

I'd like to drill several very small (~0.015") but relatively long (~1") holes into a bar of stainless steel, as shown in the diagram below. I did a quick check on McMaster and all the drilling ...
6
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4answers
12k views

How to define Knurl on drawing?

I made this kind of knurl on shaft : but I am not sure how to be define on the drawing. I found some examples but not sure if they are correct. On the examples there type (GV) and depth of knurl and ...
2
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0answers
93 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 ...
4
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2answers
240 views

What diameter hole will a twist drill bit of a given size actually make in a piece of metal?

I have a piston of diameter 0.7 mm exactly and a 0.7 mm drill bit. Let's call the diameter of the piston $r_1$, the diameter of a hole at the end of a tube $r_0$, and the final-actual diameter of the ...
3
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7answers
3k views

How can I cheaply drill a 0.1 mm hole in a small piece of tungsten?

I have a 10 mm diameter rod of 99.5% pure tungsten that I want to drill a 0.1 mm hole in using my Grizzly G0768 lathe. The hole only needs to be between 0.1 mm and 1 mm deep and is for a 3D printer ...
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1answer
78 views

What chuck arbor do I need for a Jacob's JT #33 chuck and G0768 grizzly lathe?

The chuck I have is: Jacob's 0-1/2" JT #33 The lathe I have is: G0768 I'm wondering what chuck arbor I need to buy / how to determine that. Related: the chuck has threads in its hole, but I see no ...
2
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1answer
127 views

What's the most cost-effective cutter bit material that can be used to machine aluminum oxide?

Al2O3 is a hard, white material used for making firebricks and numerous molded ceramic parts. Say I had a firebrick, took a core out of it using a thick-walled diamond hole saw and a drill press. ...
4
votes
1answer
60 views

Placing machine visions targets with high accuracy

My company is working on a machine vision application. One of our requirements is that the camera peer through a frame (like a picture frame - see here ), where the top and bottom border are etched ...
5
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2answers
980 views

What prevents using a toothed blade with a cutoff saw designed for abrasive discs?

I have an abrasive cutoff saw that I use to cut metal, it runs at 3800RPM. You cannot cut aluminum with these saws, so I bought a carbide blade rated for 3800RPM. I went to install it, but after ...
4
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1answer
595 views

How much larger must the ID of a cylinder be than the OD for a Slip Fit? Material: Delrin (Acetal)

I am prototyping a nested waveguide made of four cylindrical sections. Each piece is turned on a lathe from Delrin (acetal) rod. Each piece fits inside the next larger one. There are no moving ...
4
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2answers
413 views

How to specify and tolerance a “sharp” point?

I need to have an electrical probe machined; but I am unsure how to specify my requirements. I am an electrical engineer with only moderate mechanical knowledge. The probe will be machined from 0....
3
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2answers
950 views

How do you apply fits and tolerances when designing hole and shaft?

I am familiar with the basic concepts of fits and tolerances, and I am aware of the various online calculators for determining them. However, I don't understand how to apply those numbers to my actual ...
2
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0answers
52 views

Identifying coefficients to determine cutting speed for PA6 plastic

As part of a study at work, I have to calculate the cutting speed and feed rates for cutting plastic. I have found a formula for cutting speed calculation: $$v={{C_V*K}\over{T^m+t^{x_v}+s^{y_v}}}$$ ...
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1answer
313 views

Are there any materials that can not be drilled or sawed?

Are there any materials, such as a type of tempered glass, that can not be drilled or penetrated by any means (steel drills, diamond drills, saws, lasers, ablation with focused ion beam machines, etc) ...