Metal machining requires different parameters of work – as for automatic and numerically controlled (CNC) milling. It should be adjusted to the stage of machining (initial, precise) and type of the alloy.Different types of metals require dedicated procedures of machining, and adjustment of key milling parameters, such as:

This subject is sometimes misunderstood and overly complicated for paint and coating systems. Capital items require intricate analyses to identify the full financial impact. Paint and coating systems are basically expense items without salvage value or depreciation considerations. However, they are tax-deductible in most instances. Only a few calculations are needed to compare one system with another and to measure each system’s true cost in comparable dollars.

The costs in the guide are not intended to be absolute, nor are they intended for use in estimating or negotiating. Specific job costs will vary depending on the job size, geographic location, logistics, competitive climate and other factors, including available working hours, allowable time to completion, traffic restrictions and level of inspection required.

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An additional calculation, called the Average Equivalent Annual Cost (AEAC), is popular with many engineers. This simply converts the entire stream of present and future costs to a present worth (NPV) and then distributes that sum in equal annual amounts over the structure’s life. The formula5,6 to calculate this is (i = interest; n = structure life).

For each candidate system (using a separate sheet for each), develop a timetable for the design or projected life of the coating on the structure).

Table 8: Paint Removal Containment Multipliers Guidelines Containment Designation is in accordance with SSPC Technology Guide No. 6, Guide for Containing Surface Preparation Debris Generated During Paint Removal Operations

Compare these values, particularly NPV, for a direct comparison of number of painting operations and each system’s true cost in monies today. See Table 2 for an example of a Present Value Analysis (PVA).

Metal machining is a technological procedure of shaping a vast variety of metal alloys by milling machines. It can be achieved by usage of manual tools, hand tools, and dedicated machines (mills, lathe, manual, automatic, and CNC controlled). The goal of metal machining is the production of a shape or part with specific parameters. The complexity of that process is related to the type of machined alloy. The higher its rigidity, the more specialized tools, and procedures are required. Still: the metal milling process has been well-known for ages. Parts made in that process are important elements of many machines.

Hot dip galvanizing is a shop-applied coating (installed by dipping the parts in special cleaning and molten zinc baths), which provides a combination of physical properties that can be superior to many other coating systems. A galvanized coating consists of a progression of zinc-iron alloy layers metallurgically bonded to steel substrates. The resulting coating is anodic to steel, resists underfilm corrosion, has excellent abrasion resistance and provides excellent film build at sharp corners, edges and projections. The service life, material costs and all labor and equipment costs associated with surface preparation, fluxing, dipping and cooling for hot dip galvanizing are included in Tables 4A and 6.

Regulations on containment, capture and disposal of removed coatings (especially coatings containing hazardous metals) continue to impact the cost of painting projects and may not be captured by the estimates in this guide.

Note that this “practical” maintenance sequence is based on one approach, but it may not always represent the most economical approach to maintenance painting. The determining factors are the amount of corrosion present and the physical characteristics of the existing coatings. These factors should be assessed prior to the next scheduled painting operation. In some cases, multiple cycles of touch-up and maintenance repainting can be performed, pushing the need for full repainting further into the future.

The life and cost of the repainting steps following typical maintenance painting practices will vary according to whether the original work was shop or field applied. Table 1 provides estimated costs for a typical maintenance painting sequence, based on both shop and field application for the original work. This table includes multipliers for determining the approximate cost for each field repainting step based on whether the original work involving all coats was done in the shop or field.

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This guide defines a wide variety of coating systems in terms of required surface preparation and generic coating product(s). In the tables 4A through 9, the practical service life of coating systems in atmospheric exposure is defined for four different standard service environments. The service life for coating systems in water immersion service is defined for three categories of water exposure. Service life data for metallizing and hot dip galvanizing is included.

Deburring tools shape edges and remove burs, especially in holes and slots.

The purpose of the guide is to provide an easy-to-use, practical means to identify, compare, select and justify suitable, cost-effective protective coating systems for specific environments, and to answer fundamental questions such as the following.

National Association of Corrosion Engineers, Houston, Texas, TPC Publication 9, “User’s Guide to Hot Dip Galvanizing,” Appendix C.

Surface preparation techniques that use water or non-traditional abrasives may adequately remove coatings and may reduce potential risks to the environment and the workers involved in coating removal.

Decisions involving whether a full repaint is required, as opposed to another maintenance repaint or touch-up, should be based on the results of an investigation of coating thickness, adhesion, substrate condition, and the extent and distribution of corrosion.

How long a coating system will last depends on the user’s approach to, and philosophy of, maintenance painting. Is protection alone important or is appearance also a primary consideration? Is painting viewed as an unfortunate necessity or is cost-effective corrosion protection the objective?

On new capital projects, coating costs may be capitalized, which will require considerations for depreciation. However, most maintenance costs are tax-deductible, and when deducted, reduce the taxable income of the owner. The same PVA outlined in the example should be followed for making the coating selection and the analyses turned over to project management for further financial treatment and tax considerations.

Metal milling can be divided also by its technological aspects, related to machining many types of metal alloys. The technological classification of milling is:

Worksheets were developed by the authors to aid in preparing initial installation costs but could not be included due to space limitations. The worksheets are available upon request.

Reproduced with permission from NACE International, Houston, Texas. All rights reserved. Authors Jayson L. Helsel, P.E. and Robert Lanterman, KTA-Tator Inc., Paper No. 7422 presented at CORROSION/2016, Vancouver, B.C. © NACE International 2016.

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For water immersion service, there are three service environments corresponding to exposure to potable water, fresh water and salt water.

The general procedures outlined in this guide may be used to determine installed costs and life-cycle costs for any combination of maintenance painting sequences. Table 9 can be used as a guide to determine maintenance repainting risk (that is, whether the existing coating system might be a candidate for repair).

To calculate the NPV, or what $12.76 (NFV) is worth today if invested at current interest rates (10 percent) for five years, use the following formula2,3 (i = interest rate; n = number of years):

Field touch-up, however, may lead to a spotty appearance and special handling procedures are necessary to protect the finish during shipping and erection. An alternate approach, when a spotted appearance due to touch-up is unacceptable, involves the application of all coats in the shop except the finish, which is applied in the field after erection.

Metal milling is a process of machining blocks of metal alloy. It allows to form an element or part of the expected shape – usually with a routers: manual, or CNC controlled. Metal machining uses a high-speed spindle with a specialized cutting tool. It is able to remove small parts of metal blocks (in form of shavings and dust) to shape elements.Metal milling is a form of shaving machining. During that process, the excess material is removed in the form of shavings. The machining tool itself has structured geometry and amount of blades. That process can be performed in many axes. Thus creates a possibility to produce complex elements and parts with various shapes. Such features allow repetitive production of identical parts and elements. But still: time-consuming.On the other hand: CNC milling improves the process. Allows fast production of a high quantity of repeatable parts with minimal tolerances. Usage of CNC machining can improve the speed and precision of production. And that can lead to quick manufacturing of high quantities of cost-efficient parts.Despite these advantages, classic milling (sometimes called "automatic" or "manual”) is stillimportant. Especially in production of a single or small quantity of elements.

The Containment Multiplier Guidelines in Table 8 are included to aid in developing approximate costs for paint removal depending upon the containment type. These are to be used in conjunction with surface preparation costs developed in Table 7. The containment type (class) is based on SSPC4 Guide No. 6, “Guide for Containing Debris Generated During Paint Removal Operations.”

2.Federal Highway Administration, Turner-Fairbank Highway Research Center, Bridge Coating Technology, “Metallizing: The Illinois Experience,” http://www.tfhrc.gov/hnr20/bridge/ill.htm.

K. A. Trimber and D. P. Adley, Project Design – Industrial Lead Paint Removal Handbook, Volume II, Steel Structures Painting Council, SSPC 95-06, Chapter 2.

This guide produces a base cost of painting steel on the ground at the site that is then adjusted to an installed cost, using multipliers based on input from painting contractors. Most elements used in the guide have come from these contractors and have proven to be practical over the guide’s long history.

J. Helsel, R. Lanterman and M. Reina, “Expected Service Life and Cost Considerations for Maintenance and New Construction Protective Coating Work,” CORROSION 2014, Paper No. 4088.

Table 1: Examples Using Practical Maintenance Sequence: System with 20-Year Practical Life and Original Shop-Installed Cost of $4.10 per Square Foot, and with 20-year Practical Life and Original Field-Installed Cost of $5.11 per Square Foot.

For each system, indicate in the timetable when all painting operations will take place: original painting, touch-up, maintenance repainting and full repainting. If the analysis is based on the design life of the structure, repeat the painting cycle(s) as necessary to achieve the desired life. Insert the current costs for these operations (that is, the costs if they were performed today).

It should be noted, however, that the distribution of the breakdown must also be considered when making judgments regarding the feasibility and costs of maintenance painting. For example, a 5-percent breakdown that occurs in well-defined areas can be practically repaired through localized touch-up, whereas a 5-percent breakdown uniformly scattered across 100 percent of the surface may be beyond practical spot repair. At a minimum, a full coat is required, if the coating is even salvageable. The guide does not address these differences, but the user must take them into consideration when making painting decisions and determining the costs of painting.

Metallizing is the application of zinc and/or aluminum directly to a steel surface. For atmospheric exposure, a typical composition of the metal is 85-percent zinc and 15-percent aluminum. The metal is applied by “thermal spray” where the metal, in wire or powder form, is heated, liquefied and sprayed onto the substrate. A sealer coat is often applied to the metal coating since metallizing results in a somewhat porous coating layer. Metallizing provides galvanic protection to the steel and is a very durable and abrasion-resistant coating. This system’s performance (life) is provided in Tables 4A and 4B. The costs for metallizing are estimates based on information published by the Federal Highway Administration.2,3

Shop blasting and priming has a substantially lower cost as compared to doing the work in the field when a minimum of 250 tons of steel are involved and the steel fabricator has rotary wheel-blasting equipment (see Tables 6 and 7).

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Designed to assist the coatings engineer or specifier in identifying candidate protective coating systems for specific service environments applicable to a broad array of industries, this guide provides the following.

Jay Helsel is a senior consultant with KTA-Tator, Inc. He holds an Master of Science degree in chemical engineering from the University of Michigan, is a licensed professional engineer in multiple states, a NACE-certified Coating Inspector, and an SSPC-certified Protective Coatings Specialist (PCS) and Concrete Coatings Inspector (CCI). At KTA, Helsel manages coating projects, performs failure investigations and coating surveys, writes coating specifications and is a regular instructor for KTA coating inspection courses. Helsel previously served as a lieutenant commander in the U.S. Coast Guard with experience in marine vessel inspection.

For example, if the practical life of a system is 21 years, the spot touch-up would occur at year 21, with an overcoat at year 28 and full replacement of the system at year 39. Even though complete removal and replacement of a system is no longer a “maintenance” operation, it may be included in the life-cycle analysis (as subsequently discussed) to allow for a comparison of different coating systems that have varying lengths of practical service life.

Major manufacturers of protective coatings, steel fabricators, painting contractors, galvanizers and end users were surveyed to identify surface preparation and coating application costs, coating material costs, typical industrial environments and available generic coatings for use within those environments, and expected coating service lives.

Traditional metal milling utilizes manual and / or automatic mills. Such a process has been present in almost every industry for decades. For years such tools were used to produce many sorts of elements from metal, wood, POM, and many other materials.The milling itself provides high efficiency and precision in shaping surfaces. Although its advantages, manual and automated milling, it is time consuming. That limits the production (especially: its quantity). Yes, such machining is perfect for one-off production and helps to keep the lowest tolerances and best fitment. But with a cost: more attention to detail makes that process less efficient and more expensive – due to the need to lease each movement of the spindle.The real change in the milling of metal and other materials is related to the introduction of CNC: computer numerical control in the 50s. Such development decreases the time needed to lead the spindle and makes the whole process of milling much faster. Due to its automatic nature, the milling process is controlled by a computer and given instructions.The disadvantage of that process is also pretty clear. Although the milling process itself can be sped up, the preparation for the work is time- consuming. Preparation of instruction for the CNC metal milling process is time consuming. On the other hand: the whole process, when programmed, is much faster than manual milling. That is why CNC metal milling is the most efficient over 100 elements.

Examples of maintenance painting following this convention for various coating systems are presented in the guide. It is important to note, however, that this sequence does not always represent the most economical approach to maintenance painting. Often, several cycles of touch-up and maintenance repainting can be performed prior to the need for full repainting. The determining factors involved with this type of extended maintenance painting sequence are the amount of corrosion present and the physical characteristics of the existing coatings. These factors should be investigated prior to the next scheduled painting operation.

Robert Lanterman is a coating consultant with KTA-Tator, Inc. He holds a Bachelor’s degree in chemical engineering from Youngstown State University, is an SSPC-certified Protective Coatings Specialist, an API 653 Certified Inspector and a NACE Level-3-certified Coating Inspector with Marine Endorsement. At KTA, Lanterman manages coating projects, performs failure investigations and coating surveys, and writes coating specifications.

How to mill small metal partsat home

“Spot touch-up and repair,” which is the first time coating repairs are made, is intended to be completed at the “Practical Life” of the coating system as listed in Tables 4A and 4B.

The coating systems are divided into two categories: those for atmospheric exposure listed in Table 4A and those for immersion (water) service listed in Table 4B. Tables 4A and 4B list the expected service life (as subsequently defined) for each “coating system” corresponding to particular service environments as described below.

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By making these calculations for each of the candidate system’s painting operations, the true cost and number of painting operations can be compared, and the coating selection made on a comparable basis. One system may be less costly to install initially, but if it has a shorter life and requires more frequent repainting, the financial cost and impact of the additional repainting — and the disruption of the structure’s intended service or impact on others (for example, traffic disruption in the case of bridges) — must be recognized.

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Table 3: Example of Economic Analysis: Total Painting Cost per Sqare Foot for 35-Year Structure Life, Moderate (C3) Environment One-Coat Inorganic Zinc System, Shop-Automated Blast-Cleaning 17-Year “P” Life, Inflation = 4%, Interest = 7%

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A “Full Repaint,” involving total coating removal and replacement, is expected to occur at the year of “Maintenance Repaint” plus 50 percent of the “Practical Life” (that is, Maintenance Repaint year + [P x 0.5]).

The categories for surface preparation include either hand/power tool cleaning or abrasive blast-cleaning. A distinction is not made between grades of blast-cleaning (for example, Near-White versus Commercial Blast).

The sequences followed by users in maintenance painting vary widely. For some, the only criterion is this question: “Does it need to be painted?” However, when reviewing the subject with quality painting contractors, the consensus is that most users generally follow this sequence.

Table 4A: Estimated Service Life for Practical Maintenance Coating Systems for Atmospheric Exposure (in years before first maintenance painting)1

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Guidelines for developing long-term life-cycle costs and number of paintings for the expected life of the structure are also included. The basic elements of economic analysis and justification are addressed together with guidance on the preparation of a Present Value Analysis. Examples are provided to aid the reader in the proper use of the information (Tables 1-3).

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Decisions involving whether a full repaint is required, as opposed to a maintenance repaint or touch-up, should be based on the results of a field investigation. Generally, touch-up procedures are used when the amount of corrosion is limited or found in discrete areas. The success of maintenance repainting depends on the coating type, thickness and adhesion of the existing coating system, as well as the substrate condition.

The time until “Maintenance Repaint,” which includes spot priming and a full overcoat, is estimated to be the Practical Life plus 33 percent (that is, P x 1.33).

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The continuing cycle of maintenance painting is also necessary when the design life of the structure exceeds the design life of the coating system. In this case, the cost of complete coating replacement and additional maintenance cycles must be calculated to determine the total cost of the corrosion protective system over the entire life of the structure.

For each system used or considered, list the timing, number and cost of painting operations required to protect the structure for its projected life. This should include such items as original painting, touch-up, touch-up and full coats, and full repainting. The cost of each painting operation should be calculated in three categories as shown in Table 2.

Field touch-up is necessary to repair in-transit damage, but cost savings are often enough to justify shop preparation and painting. Application is easier on the ground, spray loss is reduced and safety enhanced. Jobsite conflicts, scheduling difficulties and compromised applications that can be common on new projects are greatly reduced or eliminated.

Surface preparation and application costs are primarily based on data from major steel fabricators and painting contractors. Material costs are provided by major suppliers who furnished approximate prices at which coatings are being sold on commercial-sized jobs. The current cost data was developed from the collected data along with common industry cost references.

6.D.E. White, P.A. Johnson, P.M. Charlton, “R-O-W Vegetarian Control: The Never-Ending Process,” Electrical World, p. 41, August 1986.

This guide supplies system life estimates for a “practical” maintenance approach. The estimated service life is not the time a coating system should need to be replaced but, rather, the time the maintenance painting sequence should begin — when there is 5- to 10-percent coating breakdown (SSPC-Vis 2 Rust Grade 4), and active rusting of the substrate is present.

The approach to this cost data is meant to be practical. Instead of burdening the coating engineer with complicated cost formulas based on hourly wages, supervision, equipment rates, overhead, profit and other cost elements, this guide provides total unit costs, which include all of these elements. The costs are intended to reflect current, competitive/commercial prices charged in today’s market.

KTA-Tator, Inc. (KTA) provides comprehensive assurance to facility stakeholders, offering expertise in coatings and corrosion inspection, engineering, fabrication assessment, environmental consulting, and contract administration. As a 100% employee-owned company, our commitment to excellence is inherent in all our services.

Note that the coating replacement and continued maintenance painting assumes the same type(s) of coatings for the particular protective coating system are used over time.

The “service environment” defines the anticipated environmental exposure conditions for a coating system. For atmospheric exposure, there are four service environments that correspond to ISO1 12944-2, “Classification of Environments.” These categories are defined as follows.

Milling machine

In the case of ordering CNC metal milling services the customer just needs information related to the ordered product: its specification and physical characteristics. A professional team of experienced CNC operators will select the right techniques of metal milling. And achieve the highest quality final product, along with client expectations.

Table 2: Example of Present Value Analysis: Total Painting Cost per Sqare Foot for 45-Year Plant Life, Field Application Three-Coat Epoxy Zinc/Epoxy/Polyurethane, Blast-Cleaning, 14-Year System Life (Severe/C5-I).

The process of milling metal can be divided based on kinematics (movement of the spindle) and construction (machined surfaces).

Each of the parameters should be selected and adjusted for the optimal utilization of the CNCmilling machine features and used cutters.

The information detailed for designated “coating systems” includes the level of surface preparation, generic coating type(s) and a minimum coating dry-film thickness.

Table 4B: Estimated Service Life for Practical Maintenance Coating Systems for Immersion Service (in years before first maintenance painting)1