Hi all,

have you seen somewhere, or have an experience and can help with topic as follows:

Let's say we have 300t of electric cable spooled inside the cylindrical tank. Are there any guidelines how to calculate pressure exerted by this cable on the tank side walls? It's probably not so obvious, since cable friction can have an influence on the pressure.

Any ideas?

I mean, obviously it's 2¹⁶ - but I worry about my colleagues sometimes.

I am currently doing research on the use of Silicon Carbide in the world Fluid Dynamics, and I have hit a speed bump. I am looking for someone/a group that has experience in material engineering, that can give me insight on absolute roughness calculations using only the Ra or Rz values.

Any help is greatly appreciated.

Hello everyone, I’m a project management team in a FMCG personal care manufacturer.

We have expired perfume and expired cosmetics raw materials in every year.

We used to recycled expired perfume to a potpourri, scented ceramic, scented candles’ manufacturer.

However we have no ideas what industry needs expired cosmetics raw materials, such as lavender oil, gamat oil, wakame glycerin extract, and organic virgin sweet almond oil, and other 19 SKUs.

Anyone has any ideas what industry needs expired cosmetics raw materials?

Thank you.

Hi all, quick question.

I'm trying to find a local supplier of what I call star nuts (aka star fangled nuts, aka tube connector nuts) to see if I can find sizes to suit my particular application.

Image of the part https://www.jensonusa.com/globalassets/product-images---all-assets/aheadset/hs707z03.jpg

My searches are turning up only cycling specific parts, which is where I know these inserts from, or suppliers from the opposite sides of the world (US or Asia).

Does anyone know another name for these fasteners or a European supplier?

Hi, I often see drawings from engineering firms that indicate the alignment of existing buried utilities such as pipelines. I’m aware of the NPMS Public Viewer where I can see the pipelines from a broad perspective, but I am curious what resources are used to get the more detailed data for use on drawings. It seems like the more precise NPMS data access is reserved for operators. I realize that an on site survey with GPR may be required to get exact locations. Thank you for reading.

I'm working on an elaborate hobby project and I need some hinges for a small folding compartment, but I can't really find a source for precision hinges that aren't for large doors or european-style cabinet hinges, despite my googling.

I'm looking for a small flush-style hinge with 12mm leafs. Preferably stainless steel and with knuckles that aren't bent. So I guess I'm looking for something machined or cast to a tight tolerance.

Does anyone know a parts supplier with a wide variety of small hinges? Ideally it'd be something like mcmaster-carr or mouser but for hinges lol. M-C just seems to have door hinges.

EDIT: Thanks for the engagement everyone! I'm diving down rabbit holes as usual when faced with a new problem. Here's a short clip of the hinge action I need. The material is 12mm Baltic Birch Ply, and by "high precision" I just mean slightly better than the cheap loosely assembled bent-aluminum piano hinges you get at home depot.

Something made of steel or at least high grade aluminum. The problem is it also has to look nice so I was hoping for a non-mortise hinge where only the knuckle would be visible in the small slot near the rotation axis in that video clip.

Good morning!

I am a high school math teacher and father/coach of youth baseball players in search of some engineering help.

I've had an idea for a while to create a device to throw wiffle balls to youth baseball hitters. It would look something like those launches dog owners use to throw tennis balls.

Dog Tennis Ball Launcher

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The reason for a device to do this, instead of by hand, is the device would allow for it to throw other types of pitches besides fastballs. Mainly curveballs. Players need to see these types of pitches and most coaches are not very good at throwing them consistently.

I'm envisioning a device like the dog product, where there are few, if more than one, components.

I've tinkered with some ideas, but I'm discovering what you all already know... when I build a prototype it is very difficult then to make adjustments to it without having to build a whole new prototype.

If there is some type of CAD software that can design and model throws, that would be awesome. Me trying to learn the software in any reasonable amount of time, not awesome.

So, if anyone can help me out, I would certainly appreciate any thoughts you have. Thank you, so much!

Jason

Evansville, IN

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ps - I believe this adheres to the boards posting guidelines, but if not, please kindly let me know.

Like the title says, at my work volunteers were requested for helping to build a wheelchair ramp for an elderly woman. I designed a ramp following to the letter ADA ramp requirements. All in all the project was estimated to cost about $1300 US. Now HR, who is coordinating the project, wants me to redesign it to lower cost.

Having worked with wheelchairs and wheelchair patients in the past, I know how important a good ramp is. To significantly lower cost, I would have to reduce the overall length and increase the slope of the ramp considerably, making the ramp harder to use. I'm thinking that I just want to withdraw from the project, rather than put my name in something I know is not what the patient needs. Am I being overly dramatic?

Edit: Thanks so much for all the replies everyone. Here's some additional details I should have added. My company is hosting this project to support a local charity on behalf of this woman. The ramp is for her personal residence, so not for public access. I did the bulk of the work during company hours (with permission), and all the labor was going to be supplied for free by another department in the company.

I feel strongly that I should hold my ground and not compromise what I know to be the right design. I really appreciate all the advice from you all, it gave me a lot to think about and other ways of looking at the problem.

I'm a performance and test engineer shoe-horning myself into a much broader role that includes much more designing and fabrication. I realized I am lacking fundamental understanding of how to interpret and implement GDT.

Any recommendations for affordable self-teaching resources with walk-throughs and maybe even interactive content?

Has anyone else run into this? I'm working with a manufacturer that does not have any finished good drawings for their products. We use excel spreadsheets that list dimensions and other product requirements for our product groupings. The BOM is handled by our ERP system, which dictates exceptions to our spreadsheets.

It is mind boggling that we do not have finished good drawings. Something that would be easy to create and clearly define our requirements is not seen as a value add. Our teams spend a lot of time trying to sort out what our product requirements are and I've run into quite a few undocumented "product requirements". This isn't someone building a couple of parts in their garage; we have thousands of SKUs and a fairly large facility. It's been a very large source of frustration for me. Just wondering if anyone else has run into this previously and how common this is/ isn't.

Hey

I can't seem to find manufacturing tolerances for pneumatic tubes made of polyamide and PU. The search directed me to ISO 1307:2006, but I find it odd that there is such a big tolerance range.
Please guide me to right direction to find manufacturing tolerance for 8x6 plastic pneumatic tubes.

Best regards!

While disposing of my old concrete patio at the local landfill, the attendant signaled me to pull my SUV/trailer forward onto the 60 ton truck scale indicating 7304 lbs (3320kg). I walked off the scale to visit the cashier, noticing the display value dropped by 185lbs (84kg) reflecting my body-weight and accurately, to within 1/2% - in the context of the scale's capacity that division is 8.3e-6. A strain gauge and circuit configured to supply an 5vd ADC input over a variation of 60 tons would go from 5v down to .000004v. 24bit A/D converters have that resolving power, but the analog signal conditioning / amplifiers etc... seem impossible to me; wind was blowing, my engine was running, resonance, microwaves from nearby phones, nearby behemoth landfill tractors scraping the earth. Is this a feat of DSP or perhaps optics instead of resistance based strain gauges? Perhaps a highly segmented under-weldment with 100 individual strain gauges? I am looking forward to comments!

I am working on a project where I would like to connect a flexible hydraulic tube with a 4mm ID to a housing. The housing has a spare M3x0.5mm thru hole already and I would like to avoid modifying the housing if possible.

So what I need is a barbed hose fitting to straight thread connector. This is a pretty easy part to design and have made, but I feel like I should be able to find a COTS part.

I essentially need this part with an M3x0.5 thread on one end and a barbed fitting for 4mm ID hose on the other. I have limited experience with sourcing such parts, hence my search being exhausted with McMaster. If anyone could point me to another source for such parts, I would be much appreciated.

Thanks in advance.

Hey everyone!

I'm not very experienced with flow meters, however, I'm in need of a flow meter that can measure water flow rate regardless of pelleted material (2-4mm) flowing alongside the water in the pipeline.

The pipeline is 3" dia, and has a flow rate of 37 cubic meters per hour. However, I need instantaneous flow reading to complete an application where I can have pre/early detection of line clog-ups based on water flow rate reading.

I hope what I've written above makes sense, thanks in advance!

I am looking for a method to consistently separate resin beads from carbon granules to determine the ratio of each component in an unknown mixture. The main issue is that they have similar particle size distributions and densities so they don’t separate out with a sieve or in water.

The resin does tend to sit on top of the carbon when mixed in water, but not enough for a total separation. The resin is also pretty spherical so potentially some mechanical separation would work using the fact that it would roll more.

They are both small enough that they are effected by static so that didn’t work. I’ve tried oil & water separations since the resin is more hydrophilic,and while the carbon sticks to the oil and the resin separates, it doesn’t separate in layers, it just kind of creates globs that mix together.

I don’t want to use a solvent to dissolve the resin because I am trying to minimize waste as this would be a frequent analysis.

Any ideas for other methods to separate these two materials?

ETA: the resin is a different color than the carbon but imaging technology used previously ended up being too costly and tedious for a large scale application. This test would be done daily

Hey guys my dad wants me to ask if this is possible because pulsation dampeners are super expensive.

We have a Wilden AODD 3" Pump (There is six of them here, I'm not sure which exact one it is as of now). The pulsation dampener for this is like $7,000 (going off of this link: https://wildenstore.psgdover.com/products/surge-dampeners/item-71-8026-wilden-3inch-metal/)

My dad wants to know if it is possible for him to create his own. It doesn't have to be perfect or work anywhere near as good as I imagine the $7,000 one works.

From the very short list of YouTube videos we could find on custom pulsation dampeners, people seem to just hook up tanks to their pumps to act as a dampener. My dad was wanting to hook up a random tank to it but I told him I'd ask here first. I figured there was no way it would be as simple as adding a little tank onto it if the original one is so expensive.

Is there a lot more technical stuff to it than what meets the eye on a pulsation dampener? My dad is very good when it comes to working with metal and welding and we were asking ChatGPT for advice. All we were missing from the formula was the "Pump Discharge Stroke" which I couldn't find online anywhere for that pump.