www.holtecllc.com ISO – Positioning a Company Towards Global Competitiveness We know obtaining ISO registration is no easy feat. In fact, it often requires the involvement of multiple people within the company over multiple months. We want to take a moment to recognize the hard work put fort

To help manufacturers and businesses alike navigate the current health crisis or learn about lean, workforce development strategies, marketing tactics, and more from the comforts of their facilities, here are several webinars to keep you focused, positive, informed, engaged, and productive.&nb

Missouri’s initial recovery phase began May 4, 2020, and during this phase we can gradually start to reopen economic and social activity. This will be a deliberate process, and is flexible to adapt to the situation. Some communities may be able to reopen at a faster rate, while others may need to c

In response to Covid-19, manufacturers have been asked to help fill the PPE supply chain gap need. This page provides several avenues and opportunities for manufacturers to get their products into the hands of those who need them. Join the #MAKEadifferencechallenge. The top priorit

The state’s Manufacturing Extension Partnership (MEP) Center, Missouri Enterprise, announced the creation of the Covid-19 Reopening Products & Services Directory to help employers protect their employees on the job while also supporting the manufacturing community in our state. Many Missouri

In this article we will discuss about the process and characteristics of sand casting. Process of Sand Casting: The importance of sand casting is increasing day-by-day as the scientific research has brought about lot of applications and adaptations in the field of casting industry. This is probabl

Some of the casting defects are described below: 1. Surface Roughness: Too coarse a moulding sand or when pouring temperature is high leads to rough or pebbly surfaces on castings. In steel castings, roughness is produced due to occurrence of surface reaction at mould-metal inter­face in w

In this article we will discuss about:- 1. Definition of Sand Moulds 2. Classification of Sand Moulds 3. Feeding of Metal. Definition of Sand Moulds: A sand moulds may be defined as-a preformed sand container into which molten metal is poured and allowed to solidify. After casting it is removed

The following points highlight the nine main properties of moulding sand. The properties are: 1. Permeability 2. Cohesiveness 3. Adhesiveness 4. Plasticity 5. Refractoriness 6. Chemical Resistivity 7. Binding Property 8. Flowability 9. Green Strength. Property # 1. Permeability: The passage of g

The following points highlight the fifteen main patterns used for casting of materials in an industry. The patterns are: 1. Single-Piece or Solid Pattern 2. Split Patterns 3. Loose Piece Pattern 4. Gated Pattern 5. Match Plate Pattern 6. Follow Board Patterns 7. Sweep Patterns 8. Segmental Pattern

In this article we will discuss about:- 1. Definition of Moulding Sand 2. Types of Moulding Sand 3. Chief Constituents. Definition of Moulding Sand: The principal raw material used in moulding is the moulding sand because it provides several major characteristics that may not be obtained from ot

Pattern allowances in order to produce a casting of proper size and shape depend partly on product design, mould design, shrinkage and contraction characteristics of the metal being cast, etc. Actually, it is very difficult to predict precisely any rule mathematically, and a process of trial and e

In this article we will discuss about the solidification of metals:- 1. Mechanism of Solidification 2. Rate of Solidification 3. Solidification of a Large Casting in an Insulating Mould 4. Solidification with Predominant Interface Resistance 5. Solidification with Constant Casting Surface Temper

The following points highlight the four main steps involved in the casting process. The steps are:- 1. Preparation of Pattern and Mould 2. Melting and Pouring of the Liquefied Metal 3. Cooling and Solidification of Liquid Metal 4. Defects and Its Inspection. Steps involved in the Casting Process #

The following article will guide you about how to design a gating system used in casting of metal. Design of Gating System: The design of a gating system depends on both the metal and mould compositions. For example- an elaborate gating design is needed to avoid dross (e.g., oxides) in easil

The purpose of theory of grinding is to establish relationship between the radial feed, force on individual grits of grinding wheel, velocity of grinding wheel, velocity of work and their diameters. Fig. 20.5 shows a magnified portion of the grinding wheel and work in contact with each other. It

In this article we will discuss about:- 1. Manufacture of Grinding Wheels 2. Processes of Grinding Wheels 3. Grade 4. Structure 5. Area of Contact. Manufacture of Grinding Wheels: (i) The abrasive particles are first crushed to powder form and passed over magnetic separators for removing iron im

Abrasive particles used for grinding wheels are of two types viz.: 1. Natural Abrasive and 2. Artificial Abrasive. Generally for most of the purposes, natural abrasives are not used due to certain advantages of artificial (manufactured) abrasive. Natural Abrasives: These are produced by uncontrol

In this article we will discuss about the influence of various angles on cutting edges in milling of steels. 1. Radial Rake Angle: It is obvious from Fig. 16.33 that radial rake angle is the angle between the blade (flute) face and a radial reference plane drawn from the cutter axis to the cuttin

In this article we will discuss about wheel truing and dressing of a grinding wheel in the industries. Wheel Truing: Wheel truing is defined as act of restoring the cutting face of a grinding wheel by removing the abrasive material from the cutting face and sides of the wheel, so that it will ru