Questions about how to choose the correct size, grade, options, etc. for a known piece of equipment, given a well-defined use case.
Questions tagged [equipment-selection]
18 questions
5
votes
2 answers
How to evaluate new Vernier calipers?
I am looking to purchase some new Vernier calipers, but I am overwhelmed by the amount of specs which are being offered. I need help in understanding how to evaluate them.
I do not want a dial or digital set of calipers, but rather am interested in…
RobertBarington
- 51
- 1
5
votes
2 answers
How to select a low flow rate diesel flow meter
I need to select a precise flow meter for the following application condition:
Flow range: 0-150 liter per hour
Medium: Diesel
There are so many meters on the market that I am a bit lost. How do I determine whether a flow meter is acceptable for…
Maruf Hossain
- 51
- 2
5
votes
1 answer
Understanding a Caterpillar Excavator Recomendation for Increasing Life
I am trying to understand / interpret one recommendation I read on a Caterpillar website for maximizing excavator life:
**
Never dig over final drive.
**
Can anyone explain what this means? What's the "final drive" and what does digging over it…
curious_cat
- 432
- 3
- 10
3
votes
1 answer
How to determine the number of effective anchors in a base plate?
The situation is a steel baseplate that has to be anchored to concrete to resist lateral loads.
The lateral load on the base plate is great enough that more than one or two anchor rods are required. The base plate has room for 8 anchor rods.
The…
hazzey
- 10,682
- 9
- 42
- 93
3
votes
2 answers
What is the opposite of an uninterruptible power supply called?
The question title says it all. I'm looking for the opposite of a UPS, ie it won't turn back on if there is a power outage. I know they exist but, I can't remember what they are called or find them on Google.
user1543042
- 141
- 1
2
votes
1 answer
How can I find the price of a product if the manufacturer doesn't show it on their website?
I need to buy a particular brand and model of stepper motor and I have found the product on the manufacturer's web catalog, but with no price listed.
How can I find the price of device? I tried writing to the manufacturer but they haven't…
Andrew Kachalin
- 241
- 1
- 6
2
votes
3 answers
What's the easiest way to count high speed pulses?
I need to count digital pulses with a width of 30 ns and display the updated count to the user every second. The pulses have already been through a comparator and a pulse shaper. Resolution isn't a concern, my only concern is the counting the number…
Alex
- 21
- 2
1
vote
1 answer
Transistor choices for switching high speed data communication lines
So here's my situation: I'm a mechanical engineering student working on a product innovation for one of my courses. The product itself is fairly heavy into embedded programming, which I'm comfortable with. What I'm less comfortable with is the small…
agentroadkill
- 181
- 3
1
vote
0 answers
Compact way to regulate 3000psi (200bar) down to 30psi (2bar)?
This was originally posted on the Lego page, and closed because it's not actually about Lego itself. I thought I'd give them a chance first, in case someone had done this already and had some application-specific knowledge. But it looks like…
AaronD
- 581
- 4
- 8
1
vote
0 answers
Calculating the proper power of a motor
I'm trying to build a filament extruder with some basic available tools and materials. Simply the main principle of the machine is to insert some amount of plastic raw material ( ABS in our Case ) to a hopper , move them inside a barrel with the…
Ahmed M.Zahran
- 121
- 1
- 5
1
vote
0 answers
External Static Pressure on Open Gallery Fan
I routinely work on building designs that incorporate rooftop upblast fans over large industrial spaces such as this one:
When selecting these fans, as with every other fan, you need to determine the external static pressure that the fan will…
Secundus
- 561
- 3
- 19
0
votes
2 answers
How to transfer compressed gas GH2 from one tank to another at the same pressure?
The problem is to transfer all the compressed hydrogen from one tank on a ship at 400 bars to fill another tank on earth (also to fill it at 400 bars). What are the common technologies and equipment (compressor, valves, connections)?
Aron PE
- 11
- 1
0
votes
2 answers
How to take dimensions of an underground tank
We have a few underground tanks with only the manholes visible from the outside. All tanks are cubic-shaped. How can we accurately measure the dimensions (depth,length and width) of the tanks? Are there any types of equipment to do that? The tanks…
dInGd0nG
- 101
- 2
0
votes
1 answer
Identification of Foundry equipment
Good day! We (undergraduates w/o prior foundry experience) inspected a foundry for its health hazards, our problem is we are not permitted to be accompanied by a laboratory assistant, so we don't have any idea what the following parts are for,…
I_Love_Eng
- 97
- 1
0
votes
3 answers
Which material index should be maximized for a component in a car's manual type HVAC?
I was doing a case study on the plastic used in cars for controlling the AC in a manual type system which actually snapped in mine it just rotates according to the knob position in the dashboard, pushing and pulling with a stiff cable/rod. It…
Ahmad Shumayal
- 109
- 1