9
votes
Accepted
Unit of "cN.m" used on torque wrench
100 cN.m are 1 N.m
The c before the N.m is pronounced centi. It's a standard SI prefix.
1 c ...
- 24.3k
6
votes
Can we build a tool that measure curvature on an arc?
For a circle, yes. Such a tool exists:
Digital Radius Caliper
There are also Digital Radius Gauges, which may be useful for smaller curves.
For a general curve, you can't measure the curvature ...
- 2,631
4
votes
Accepted
Cutting tool for hollow tubes
Probably a skilled metalworker will come along and lough at me for this, but I don't think you can cut to 0.1 mm accuracy with many hand tools. I see these ways:
using a small saw (your tubes are ...
- 4,772
4
votes
Accepted
Potentially fatal near miss: Due diligence in tool selection
As a busy engineer, I would say you did your due diligence. There are always more variables than we are given time to consider. The higher the risk of failure/injury, the more time we spend on it, but ...
- 7,904
4
votes
Making precise, intricate measurements
A relatively inexpensive and quite useful device would be a "pocket optical comparator".
They come with Several etched glass plates with features of size that you optically/visually compare to your ...
- 1,578
4
votes
Can we build a tool that measure curvature on an arc?
How about a Contour Gauge:
And here:
Wikipedia Article
Make your measurement
Trace it
Scan/digititize it
Analyze it (spline/curve fit) with some type of CAD software.
- 1,578
3
votes
How to regulate a vacuum pump?
The device you're looking for is called a vacuum regulator and sits between the vacuum source and the process. This page from Equilibar shows some examples and provides links that explain how they ...
- 2,145
3
votes
3D Representation of Magnetic Field Lines
There is indeed a 3 dimensional analogue of the iron filings experiment and it is often referred to as 'ferrofluid', a google search for the term will yield lots of interesting videos.
In essence it ...
- 15.2k
3
votes
Accepted
What prevents using a toothed blade with a cutoff saw designed for abrasive discs?
I would certainly hesitate to install a toothed blade on a saw designed for abrasive disks. My biggest concern would be that the dynamic loading is likely to be significantly different and as these ...
- 15.2k
3
votes
I would like to cut out arcs of the circumference of a cross section of PVC pipe so the arcs are precisely 60 degrees. How would I do this?
Use a pillar drill and a rotating vice which has graduations on it.
Drill a hole at 0 degrees then rotate for hole at 60 degrees.
Repeat for other holes then join with saw cuts, dremel etc.
- 15.5k
3
votes
Accepted
What's this tool?
It appears to be a base holding a scribe. Normally they are used to hold indicators (which are like touch sensors that measure how far the arm is deflected from their neutral position). You mount ...
- 5,237
3
votes
What is this welding tool in this video?
From what little is shown, it's a TIG welder hand torch, being used without welding rod. One does not typically allow the tungsten tip to contact the work (2:26), as it did in the video, welding ...
- 6,940
3
votes
How do you use an angle gauge?
I've never seen one but it looks fairly intuitive.
Figure 1.
The base.
Vertical adjust thumb screw. Release to move the measuring arc away from the base edge to accommodate the thickness of the ...
- 10.3k
3
votes
Accepted
Identify small internal turning tool
It looks a lot like a PH HORN 105 system boring insert, e.g.
R105105 TN35, Solid Carbide $36
And you can get a holder for it, e.g.
BU105 holder (new, 1" OD) $183
BU105 holder (new, 3/4" ...
- 424
2
votes
Do micrometer calipers have any advantage over vernier calipers?
Micrometers tend to be used for higher precision measurements and are usually specific to one particular type of measurement (thickness, depth, bore etc) they are defined by their vernier screw ...
- 15.2k
2
votes
Accepted
Difference between an angle grinder and an abrasive saw
Generally an abrasive saw is a bench-top tool. It looks like a miter saw but has a grinding disc instead of a toothed blade. The dist will be on the order of 12-16 inches in diameter for a typical saw....
- 4,531
2
votes
Difference between an angle grinder and an abrasive saw
In general they are not interchangable. But if they use the same speed and clamping method then they might be. Best to check with the manufacturer.
Some discs are meant to be used only on the outside ...
- 66
2
votes
What prevents using a toothed blade with a cutoff saw designed for abrasive discs?
Generally a company is not going to recommend you do something outside the scope of the intended product design because that would invoke liability. There are lots of variables like blade mounting ...
- 7,904
2
votes
Making precise, intricate measurements
Usually threads are done by some standard. You can use calipers to measure and than find closest in standard, if your product is from eu, its easy you need eu standards like this
ISO 68-1:1998 or ...
- 324
2
votes
Accepted
What are the electronic readout versions of Dial Indicators called?
In machine shops, the purely mechanical types are called dial indicators. For ones that can be read electronically, the classic ones are called LVDT's or Linear Variable Displacement Transducers. ...
- 14.3k
2
votes
Accepted
Why is the fluted edge of a twist drill bit sharp?
The edge is sharp to make sure the side of the hole is left smooth minimizing the cutting marks and to make sure that the resulting diameter is correct.
However, if a precise diameter is required ...
- 15.5k
2
votes
Why are angle grinder discs consumable?
as a traditional grinding wheel is used, the abrasive particles get shed in the process of removing material. this exposes fresh and sharp abrasive particles so the wheel cuts like new throughout its ...
- 14.3k
2
votes
Accepted
Trying to find this exact type of T Ruler?
I'd consider this to be an identification question related to engineering, rather than a product recommendation question.
A search using "scriber and depth gauge" presents a large number of ...
- 6,940
2
votes
Glass/Tile drill bits
A glass or tile drill has a cutting edge designed for that hard material which comes off as a dust.
A wood bit cuts more material faster so it has a fluting designed to remove that material.
Purchase ...
- 15.5k
2
votes
What is the name of this thing? (hex key reduction?)
Another name you might find it is Hex bit adapter.
or Hex Shank Socket Nut Driver Set Drill Bit
Amazon has a nice set that you might like
- 24.3k
2
votes
Accepted
How to make holes in granite without electrical or iron tools?
They had jeweled points set into bronze tube drills. Artisans used generations of experience and secret grinding methods with a good knowledge of metallurgy.
This is a related article old Egypt ...
- 22.1k
2
votes
If production line is for production, what is the name of the line for decomposition?
A production line works because it is a line producing a product.
There is no equivalent decomposition line.
The equivalent would be a recycling system because it depends on breaking down individual ...
- 2,467
2
votes
Accepted
Punch Hole Exactly in Center of Acrylic
The problem is you are missing a reference edge or hole to indicate anything off of, and you can't trust the edges of your rectangle plate.
Maybe cut out the acrylic in an oversized circle (for ...
- 5,237
2
votes
How to extract a broken 6.5mm plug from jack?
Best option is to open the device and use a tool or paperclip to push the remains out.
Does depend on having access though, or very fine tweezers but then you tend to be working blind...
Whatever you ...
- 15.5k
2
votes
Accepted
I would like to cut out arcs of the circumference of a cross section of PVC pipe so the arcs are precisely 60 degrees. How would I do this?
Put a hex-head plug in each end so you have a flat.
- 4,607
Only top scored, non community-wiki answers of a minimum length are eligible