A recent project request came into CMRP from one of our customers to help them in recreating a unique feature for one of their clients. The client wanted to add a truly standout ornamental showcase for their building based on a piece they encountered elsewhere. The piece was designed to be a decorative crown for a circular tower with a prominent location on their building. A varied combination of tubes, plate, and sheet would be needed to recreate the leaf-like crown display. Continue reading A Crowning Achievement
Since January 1, 2018, trucking rates have risen 20 to 40 percent. This holds true for LTL (less than truckload) loads and full truckloads. According to the American Trucking Association, there is a shortage of 51,000 truck drivers nationwide this year – that number is up by 20,000 in 2013 and 36,500 in 2016. And by 2021, there will be an expected shortage of 100,000 drivers. Most of this shortage in the industry is the result of the new electronic logbook devices (ELD) requirement. Every truck newer than the 2000 model year is required to implement an ELD. Continue reading A Perfect Storm is Brewing
It was Thursday, March 29th just a day before the Easter Holiday weekend and while the phones were quiet for most of the day due to a vast majority of the industry gearing up for time away from the office; just after lunch the expected lone phone call rang through seeking much-needed help in a time of despair. The project was 24-02 49th Ave, Long Island City, NY. The building was purchased as a combined office/warehouse in 2016 but plans to turn the building into creative office spaces took a few years to come to fruition. Continue reading The Only Problem was Time
In today’s world of complex steel fabrications, we are all governed by allowable tolerances. Tolerances are important as they ensure a clean/neat fit up and or proper clearances. This confirms that at time of assembly everything fits as how it was designed; thus alleviating headaches or issues at critical points in the project where any mistakes could lead to bottlenecks and negatively impact the manufacturing or fabrication process.
But many times, and especially in the bender roller industry, we are presented with contradictory tolerancing. This is especially true on frame rail members made for the construction and or agricultural industry. These parts usually consist of a single kick bend (primarily less than 45deg), with two long tangents coming from both sides of the bend; with the critical dimension to hold, being the offset from straight at the far end of the member. (This issue can be observed not only in these specific parts but any bent member where the far end tangent position is critical). This offset from straight is usually toleranced at +/- ¼” deviation. At the same time, the degree of bend is toleranced at +/- 1deg deviation. It should be noted that in most applications +/- 1deg allowable deviation on the bend made is industry standard.
The issue between these two tolerances increases as the length of the tangents increase and we move further away from the bend. In looking closer at the +/- 1deg tolerance on the degree of bend, this allowable deviation is problematic in nature as it is derived from the slope and is linear in its function. This deviation can be expected to exhibit itself incrementally, and as tangent lengths increase the deviation equally increases. This places the measurement of the offset at the far end of the tube out of tolerance while maintaining a +/- 1deg .
This issue can be observed in almost all parts with tangent lengths longer than 1ft or 12”. In order to hold the +/- ¼” tolerance placed on the deviation in the offset from the straight dimension, the tolerance placed on the degree of bend must be fractional at best, which in most cases is extremely difficult to hold and or maintain.
Architects and sculptors are continuously coming up with new ideas to use steel pipes and tubes in their designs and work. Steel is a popular artistic medium because it is impactful to the viewer, seeing such a hard material twisted and curved, often on a large scale. Architects and sculptors also like using steel because it is a material that stands the test of time. Now incorporate technology, and a steel artwork or sculptures becomes even more awe-inspiring. Continue reading Curved Pipe and Technology in Modern Architecture
In the past few years the nation’s capital, Washington D.C. / Baltimore, MD has seen a growth/development boom that it hasn’t seen since the mid-nineties. Once considered one of America’s most dangerous cities, it has grown and further developed over the years to become one of the hottest and most desired places to live. Every few blocks appears a new tower crane or a new construction site. 2017 saw over 16,000 construction permits issued, covering major Continue reading MGM National Harbor
Frequently in the steel bending and fabrication industries, our work focuses on the somewhat austere nature of steel. Even though it is curved, steel still maintains a sturdy, rigid aspect. The solid nature of the metal is a defining characteristic that isn’t easy to shed. Though there are some artists and designers who can push those notions. Continue reading Helical Curved Pipe for the Arts and Sciences
With projects increasing in complexity and size, customers complete material tractability has become the norm in the industry. Although there has been a recent increase in this type of request from customers, complete material traceability is not something new.
Whether for LEED certification, tax credits or quality assurance or insurance, project managers are requiring a paper trail for each steel member installed in their project. In some projects, it is necessary to trace each component including the alloying elements, testing results from the producing mill, manufacturing/fabrication processes, and storage. Continue reading The Importance of Material Traceability in Metal Fabrication
When steel is curved, it is important to keep the stress-strain curve ratio in mind. Below is a stress-strain graph that reviews the properties of steel in detail.
If tensile force is applied to a steel bar, it will have some elongation. If the force is small enough, the ratio of the stress and strain will remain proportional. This can be seen in the graph as a straight line between zero and point A – also called the limit of proportionality. If the force is greater, the material will experience elastic deformation, but the ratio of stress and strain will not be proportional. This is between points A and B, known as the elastic limit. Continue reading Exploring the Stress / Strain Curve for Mild Steel
We just produced some very thick and very wide rolled steel cylinders. For this particular industrial application in the chemical industry, the customer required a special grade of plate A572-50 with increased resistance to atmospheric corrosion. The yield strength of the plate was +50,000 psi, much higher than regular A36 steel plate (+36,000 psi). The higher yield directly impacts the amount of force needed to induce permanent deformation in the plate as you can see in following Strain/Stress graphics. Continue reading A572-50 Rolled Steel Cylinders