Epoxy Chemical Resistance Chart
Epoxy Chemical Resistance Selection Guide

I went to SKF to learn how to design a proper bearing arrangement and share their knowledge with you all. Thank you to Roger and the team at SKF for supporting the Marble Machine :)

Download the Roller Bearing pdf here:
https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf#cid-121486

Download the SKF SIMPRO QUICK Simulation Software here:
https://www.skf.com/group/support/eng...

The above two tools are really powerful, hopefully they can help guide your own projects correctly.

All metals except gold, platinum, and palladium corrode spontaneously

[...]

According to the DOD Technical Bulletin Corrosion Detection and Prevention there are 8 separate types of corrosion, with only a few having a major impact on stainless steel. Please be advised the descriptions below are extremely brief and written in laymen terms. //

Guideline for Selection of Fasteners based on Galvanic Action

– 304/L Stainless Steel
304/L grade of stainless steel is one of the more popular grades for making components that will hold up well when exposed to salt water but not submerged in it. It is an austenitic alloy that includes chromium and nickel and is lower in carbon than the standard 304 grade of stainless. Laser fused, wide flange, 304L stainless steel beams have been used as a corrosion resistant building material in theme parks where marine animals are the center attraction, requiring salt water tanks and pools.

– 316/L Stainless Steel
Another popular material for marine environments is grade 316/L stainless steel. This is also a lower carbon, austenitic alloy containing chromium and nickel. The addition of molybdenum provides an increased level of corrosion resistance than 304/L. Laser fused c-channels, made from 316/L stainless steel, were used to make the manatee gates that protect this endangered species in Florida’s waterways where salt water meets fresh water. This alloy was also the best choice laser fused beams used for Epcot’s Caribbean Coral Reef Aquarium.

Stainless steels are iron-base alloys containing 10.5% or more chromium. They have been used for many industrial, architectural, chemical, and consumer applications for over a half century. Currently there are being marketed a number of stainless steels originally recognized by the American Iron and Steel Institute (AISI) as standard alloys. Also commercially available are proprietary stainless steels with special characteristics.

With so many stainless steels from which to choose, designers should have a ready source of information on the characteristics and capabilities of these useful alloys. To fill this need, the Committee of Stainless Steel Producers initially prepared this booklet.

Deutsch Connector User Guide. Assembling and dis-assembling Deutsch DT, DTM and DTP Series Connectors.

if you're going to use osb, keep the noise frequency and material mu in mind. For wood that's about 700Hz for 1". Use an app like Spectroid to determine the frequency of your rain noise. If it's 1400Hz, then a half inch will work, 2800Hz=1/4", whereas if it's 350Hz, then you'll need 2" to absorb the wavelength. You'll get hardly any Db attenuation from 1/2 wavelength thickness, and a linear-like reduction from 1/2Mu to 1Mu, where it will be mostly blocked.

Alloys are listed in the order of the potential they exhibit in flowing sea water. Certain alloys may become active and exhibit a potential near -0.5 volts in low velocity or poorly aerated water, and at shielded areas.

Alloys are listed in the order of the potential they exhibit in flowing sea water. Certain alloys indicated by the symbol (symbol) in low velocity or poorly aerated water, and at shielded areas, may become active and exhibit a potential near -0.5 volts.

Many people mistakenly believe that all stainless steel is the same. This is not true. The type and grade of stainless steel fasteners that you invest in will determine just how corrosion resistant they are and, of course, how durable and long-lasting you can expect them to be. Whether you are buying nuts, bolts, nails and screws, rivets and pins or anchoring systems, you must take the environment into consideration.

Professionals must know what the difference is between 18-8 vs. 304 vs. 316-grade stainless steel. We’re going to help simplify it for you. Here’s what you need to know about each of these three different grades: ///

18-8 and type 304 are the same alloy

BRITISH & EXOTIC MINERALOGY
All 2,242 illustrations from James Sowerby’s compendium of knowledge about mineralogy in Great Britain and beyond, drawn 1802–1817 and arranged by color.

Working out the dilution rate for concentrated commercial cleaning chemicals can be difficult. correctly and accurately diluting cleaning chemicals with water is a skill that must be mastered.

Let's jump right in...

OK, so the label says 32:1 but how much water and how much cleaning chemical concentrate do you put in the bottle, bucket or cleaning machine tank?

a. Total amount of 'Ready to Use' or RTU cleaning chemical solution required is...
6 litres or 6000ml

b. Recommended dilution rate is...
1:32 or 32:1. That’s 33 parts… 1 part of chemical and 32 parts of water. It’s important that you always add the 2 dilution ratio numbers together for the calculation below!

c. Ready for some magical cleaning chemical dilution maths?
Divide the total amount of solution required (1. 6L or 6000ml) by... the total number of dilution ratio parts (33) and that will equal how much cleaning chemical you need in your bucket.

d. The maths looks like this....
6L or 6000ml / (divided by) 33 parts = (equals) 0.182L or 182ml of cleaning chemical concentrate.

Here are the 3 important numbers you need before you start…

1. Final chlorine solution volume = 100 litres = 100,000ml (because 1 litre = 1000ml)

2. Final chlorine solution concentration desired = 200ppm

3. Initial chlorine solution concentration = 12.5% solution = 125,000/1,000,000 which can also be expressed as 125,000 parts per million (ppm) because 1ppm = 1ml in 1,000,000ml ///

1% = 10,000 ppm (10,000 / 1,000,000)

The calculator below can be used to determine the temperature delta or rise for a given cooling water application (heat load or power dissipated and cooling water flow rate) using the first formula above.

Botanical name: Chlorocardium rodiei
Family: Lauraceae
Default name: Demerara Greenheart
Other names: Sipiri, Sipiroe, Itauba Branca

Wood description
The height of the tree is 21-35 meters (maximum 40 meters) and the branch-free straight cylindrical trunk is 15-25 meters long with a diameter of 40 to 60 cm. The heartwood is light to thunder olive green in color, sometimes drawn with brown or black stripes. These color differences can occur in one trunk, which sometimes gives this type of wood a colorful appearance. The sapwood is light yellow or greenish, usually 30x60mm wide and has no sharp transition to the heartwood. This type of wood is a type of wood with exceptionally good strength properties.

Wood properties
Demerara Greenheart is a heavy one hardwood having all of the following:

Volumic mass (at 12%): 970-1020 kg / m³
Bending (at 12%): 240 N / mm²
Shrinkage (at 12%): rad. 3%, pliers. 4.5%
Sustainability
The heartwood is durable (class 1) and it is very resistant to insect attack.

Editable
Drying - Very slow with a lot of tendency to tear and forming surface cracks. The deformation of the wood during the penetration is not too bad.
Edit - Quite difficult because Demerara Greenheart has a high density.
Nailing / Screwing - Moderate, pre-drilling recommended for splitting.
Finishing - Good.

Applications
Due to the high durability, strength and large dimensions in which the wood is available, it is mainly used for heavy construction work (water bridge and ship bolt, lock gates and harbor works). It can also be used for heavy workbenches and company floors.

What level of CO2 is toxic to humans?

This could occur when exposed to levels above 5,000 ppm for many hours. At even higher levels of CO2 can cause asphyxiation as it replaces oxygen in the blood-exposure to concentrations around 40,000 ppm is immediately dangerous to life and health.

How much c02 in the air is dangerous?

The American Conference of Governmental Industrial Hygienists (ACGIH) recommends an 8- hour TWA Threshold Limit Value (TLV) of 5,000 ppm and a Ceiling exposure limit (not to be exceeded) of 30,000 ppm for a 10-minute period. A value of 40,000 is considered immediately dangerous to life and health (IDLH value).

How much CO2 is too much for humans?

350 to 1000 ppm is a good quality concentration in an enclosed room. This is what the Earth is, a confined space. 1000 to 2000 ppm, the air quality is low. From 2000 to 5000 ppm, CO2 concentration starts to cause problems (headaches, insomnia, nausea).

IP2Location™ ISO 3166-2 Subdivision Code is a free data offered for your download. This data contains the ISO3166-2 code for the states/regions used in our geolocation database. You can easily retrieve the ISO3166-2 code by mapping the country code and subdivision name.

Internal volume vs. volumetric shelf space:

*Assumes 1.5-foot shelf depth with shelving along both long walls. While you can technically make a perfect shelving system that creates more space, these conservative calculations are based on designs that we have found to be cost-effective and practical for accommodating features like doors and climate control units.

The numbers above are calculated using the interior dimensions of shipping containers. When using these numbers to determine what you can store in your container, we recommend using a packing efficiency modifier because it’s nearly impossible to use every square inch of space. For example, if you need to gauge the volume of dry goods you can fit in a container with shelves, multiply the volumetric shelf space by a packing efficiency modifier of .8 or .7 to create a realistic estimate.

Means of Transport CO2 equivalent emissions per passenger km
Short Flight ✈️ 255g
Medium Car (Gasoline) 🚗 192g
Medium Car (Diesel) 🚗 171g
Medium Flight ✈️ 156g
Long Flight ✈️ 150g
Bus 🚌 105g
Medium Motorcycle 🏍 103g
Gasoline Car (Two Passenger) 🚘 96g
Medium Electric Vehicle 🚙 53g
National Rail 🚂 41g
Ferry ⛴ 19g
Eurostar (International Rail) 🚞 6g

Flying on a short flight or driving alone are the most carbon-intensive travel methods. However, adding one more passenger to your car ends up cutting the emissions in half, making driving more efficient.

, it’s worth breaking down categories of flights more, as their emissions depend greatly on their route length:

• Short Flights: For example, domestic flights within a European country, or flights within a U.S. state have the highest individual carbon footprint.
• Medium Flights: For example, international travel within Europe, or between U.S. states, have a significantly lower carbon footprint per person.
• Long Flights: Flights over 3,700 km (2,300 mi), about the distance from Los Angeles to New York, have the lowest carbon footprint per person.
  Why are longer flights far more eco-friendly than short-range flights? It’s because take-off uses much more energy than the ‘cruise’ phase of a flight. For short flights, the efficient cruise phase is relatively short-lived.