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  2. Though both words are frequently interchanged, strictly speaking, a strainer(also called sieve) physically screens finer particles from more coarse ones by size-screenibg solid particles from fluid(gas or liquid) while a filter physically or chemically separates a desired substance from its mixture irrespective of their phases by means of membranes and absorbents
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  4. Hello! I am working on a project to see how workplaces should better enable engineers during COVID. I would really appreciate your insights, the survey is pasted below. COVID-19 Engineer Adaptability Survey
  5. I am wondering the difference between the two. Is there something I am missing?
  6. https://www.growmechanical.com/2020/06/the-ultimate-guide-to-mechanical-seal-part-1.html Mechanical seal Mechanical seal is a mechanical device which is used to prevent the (leakage) liquid coming from inside casing to outside though between static and rotating parts. Mechanical seals are used in centrifugal pumps. There are many types of mechanical seals used in the many equipment’s. It is classified on the basis of design, working, and arrangement. The Seal face is the most important part of the seal. Because the face material is the most expensive part of the seal and that creates a seal between static and a rotating part of the equipment. The description of types of the mechanical seal below. Types of seal
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  8. Troubleshooting of centrifugal pump There are many types of problems happens with a centrifugal pump that is mentioned below. Flow not develop or low flow Low pressure and low head Power consumption is high High noise in pump Guide to troubleshoot of centrifugal pump mention below, and we will take a view and try to troubleshoot of centrifugal pump. Flow not developed or low flow
  9. This shows How to make a metal bender for artist metal: https://www.youtube.com/watch?v=F0yJohdG_GY
  10. Your numbers disappeared from the problem statement. Please try to fill them in. DrD
  11. As far as the horizontal positioning goes, I think esthetics is probably the main concern. I would suggest supports about 12 inches from each end, but then I'd also make a scale drawing and see if it looks right to you. The bigger question is the vertical support point. You need to look the wall supporting the bottom end of the leg and see where it can best take the loads. Remember that there will be both vertical and horizontal components of the load against the wall. DrD
  12. First, some background. I own an 84 Chevy S10 with a 2.8l V6. I've been fighting the stupid Verajet II carb since the day I bought it. It's been fairly reliable, but the power was always awful, it idled terribly, and didn't get nearly the gas mileage that I think a 1900lb vehicle should get, regardless the style of induction. Now, I am a fairly capable mechanic, and as such, I was not content to simply let this continue. No sir'ee, I had to fix it, so I went to my carb box, selected a suitable carb, (an autolite 2150 seemed appropriate) and proceeded to tear that Verajet off in a hurry. Much to my dismay, the Verajet has a very unique bolt pattern that didnt match any of the carbs in my box. Problem. I needed an adapter, so off to Oreilleys I went, purchased a universal 2bbl adapter, and went to slap it on. No dice. Not a single pattern fit. "Hmm," says I. Looks like I'll have to make one. My MIG welder was out of wire, so steel was not an option, and my TIG welder was loaned out, so aluminum was also not an option. But wait! A wild idea emerged! Sitting right on the spool of my 3d printer, a fresh roll of Shore 95a TPU. Experiment time. Most Chevy's run at about 210 degrees Fahrenheit on the water gauge, or a bit under 100deg Celsius, and my printer will only start effectively melting the TPU at around 230-240deg Celsius, but I knew little about how it would handle that kind of temperature for any period of time, so I took a previously failed print, stuck it on a piece of aluminum foil, and threw it in the oven at 250 degrees F for an hour. Upon removal, the print had held it's shape, and though it was noticeably more rubbery, it did not melt or collapse, and it returned to it's previous consistency as it cooled. This might work! So I set about designing an adapter and printing it. 16 hours later, I have a spacer. As a strength test, I set the new carb on top of the spacer, and the spacer on the floor, and pushed it around. it seemed fine enough, but I wanted to take no chances, so I coated the outside with a few layers of fiberglass resin, and supported the upper bolt plate with a pillar of JBWeld on either side, then siliconed everything to ensure I wouldnt have any vacuum leaks. A few bolts, some cursing, and an improperly utilized cotter pin later, and my truck has been carb swapped! First fire went great. I didnt touch a single adjustment screw and she's purring at a nice, smooth 800rpm. Revs beautifully. NOW HERE'S THE INTERESTING PART: Carb spacers are usually made of something solid and inflexible, like metal, and sometimes hardwood. This one is basically rubber. As the engine revs, the carb will rise almost 1/2 inch above the position in which it sits at idle, stretching the spacer, while still maintaining a seal on both gasket surfaces, thereby increasing intake runner length automatically, and proportional to engine RPM unloaded (its difficult to see when driving as I still have a hood.) Now, my current theory as to why this happens is this: A venturi is essentially a circular wing, and uses the same principle as an airfoil to achieve a different result. In both cases, air is forced to split and travel at different rates to reach the same end point, which forces velocity along the wing edge to increase, and the pressure to decrease. This effect also occurs along the bottom air filter plate on a standard dish filter, which in my case, is bolted to the carb. I think the engine vacuum is drawing the air past the bottom dish FAST ENOUGH TO GENERATE LIFT, and because the carb is mounted on a stretchy plate, it's actually trying to fly! I am currently in the process of designing Spacer/adapter V2, to try to take better advantage of this phenomenon, or really, just see if running an adaptable intake runner length makes any noticible changes in performance. This was quite an exciting discovery, and I'd appreciate your thoughts. I will try to get a video up when I have the daylight.
  13. https://www.growmechanical.com/2020/06/type-of-pump-positive-displacement.html Type of pumps Pumps are used for extract the liquid and transfer one source of liquid to another source. Pumps are uses in many industries like refineries, petrochemicals, oil and gas, pharmaceuticals, power plants, hospitalities and home application etc. It also is very useful mechanical device. On the basis of working and construction pumps classification into many types. On other site
  14. https://www.growmechanical.com/2020/06/type-of-pump-positive-displacement.html
  15. Hi All, I have a question on sealing surface roughness specification as below. A connector with FIP gasket specifies the sealing surface as '4.7/ Ra Max 0.4'. I believe 'Ra max 0.4' is 0.4μm surface roughness spec but what it the 4.7? I've taken a look in EN-ISO 1302:2002 but it doesn't appear to clarify this. Help appreciated.
  16. @The Big B Dude you are an amazing person. Thank you. I was more meaning to light them all with one button without usbs, waterproof. But I will reverse your calculations and find what I need I used this powerbank just for leds before had no problems other than usb getting unplugged from vibration. Maybe I can be a little more optimistic and get like 60 mins life and this power bank? I have fake airpods case I could use for charging and for the button, waterproof it easily.
  17. We need more details to address this question. Do you mean an air powered siphon? Do you mean air bubbles rising in a vertical pipe producing an upward movement of the surrounding water? A picture of the device would help.
  18. Design automation helps you achieve up to 70% faster design cycles by reducing a day’s work to a few hours.
  19. PMS Engineers is an established supplier of world class bearings and power transmission products. We are the first-choice channel partners for some of the world’s biggest bearing and lubricant manufacturers including Timken, NSK-RHP, NIKKI, Gamet Bearings and Motherson Sumitomo – Solid Carbide Cutting Tools. With a powerful distribution network and support team in place, we collaborate with clients round the clock to minimize downtime, reduce working costs and improve the overall quality of operations.
  20. PMS Engineers is an established supplier of world class bearings and power transmission products. We are the first-choice channel partners for some of the world’s biggest bearing and lubricant manufacturers including Timken, NSK-RHP, NIKKI, Gamet Bearings and Motherson Sumitomo – Solid Carbide Cutting Tools. With a powerful distribution network and support team in place, we collaborate with clients round the clock to minimize downtime, reduce working costs and improve the overall quality of operations.
  21. I tried to find any references or any industrial/companies that are currently using this type of joint for those materials. Unfortunately I cant find any. Which lead me to this raised question.
  22. It is definitely possible, there are just a lot of variables to consider when deciding if it is right for the application. The immediate problem is this would make it challenging/unrealistic to remove and repair either part individually. If this is not a problem, I would probably start looking at weaving/looping the carbon fiber around the mild steel structure. That way you have the structural strength of the carbon fiber holding them together, not just the adhesive. I don't know this for sure, but it may not be ideal to adhere something to the surface of the carbon fiber, because it may be more likely to just pull the lamination apart before completely structurally failing. If anyone has experience with this I would love to hear more.
  23. Two months before my third birthday I changed all the light bulbs on the Christmas tree to be red yellow green red yellow green... I dismantled the radio at age seven and the television at eight. These were the old kind with vacuum tubes and did not survive the process. I rebuilt my first engine at eleven and was working as a professional mechanic by fourteen—before I could drive a car. I have a grandson who is three and destined for the same path. My father didn't know which end of a screwdriver to hold. The engineer gene came from my maternal grandfather.
  24. Fluids above the critical temperature are called "super critical." We sometimes call a liquid above the critical pressure "super critical." For example, in most large coal-fired steam power plants, the feedwater entering the boiler is about 4400 psia (30 MPa). The critical point is where the saturated liquid and vapor are indistinguishable; that is, a distinction is physically meaningless. There are no bubbles formed when boiling a liquid above the critical pressure. This is why you must have special equipment to clean (i.e., "polish") the feedwater in a supercritical coal-fired plant, as the boiling process doesn't naturally separate out impurities and they build up over time. The pressure at the bottom of the sea is above critical. There are "vents" in sea floor where the water is spewing out at near 700ºF (371ºC), yet there are no bubbles. You can find videos of these sea floor vents online. Refrigerants have a much lower critical temperature and pressure. You can also find online old black-and-white videos of a supercritical refrigerant flowing in a clear pipe undergoing a transition from "liquid" to "vapor" but you can't see any difference or tell where it happens, which is completely different from what this process looks like at subcritical pressures. Interesting things happen around the critical point, which is why we study this region and some designs focus on this. For example, there is considerable current interest in supercritical CO2 systems.
  25. Hello. My question is where to locate the two 4 x 4 support structures I am going to use beneath a garden window which is suspended off of the house. We estimate the weight of the garden window to be about 300 pounds. I would like to position them at an angle from the bottom of the garden window to the house with lag bolts. The dimensions of the garden window are 72 inches wide by 30 inches high by 24 inches deep. The 24-inch dimension is the portion that extends from the house. Thank you. GW Support.pdf
  26. Hello, I'm currently studying engineering science, more specifically how volume, density and pressures effect one another. iv been working this question for a while now and hit a bit of a wall. it could be the way the questions written but i cant seem to finish it. All help is greatly appreciated. here it is: A ship is in dry dock in Portsmouth and water is allowed in until it floats. The volume of the water is measured and found to be . The dry dock is 84m long and 19m wide. When the ship is floating the depth of water is 6m. Calculate the displacement mass and the volume of the ship. The density of the water is . If the ship were to sail up the Rhine to Cologne where the density of water is only what will be the new displacement of the ship?
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