Foundry work doesn't care about your textbook preferences
Most people looking for A Textbook Of Foundry Technology Ebook By O P Khanna are engineering students trying to finish an assignment, or junior foundry engineers who got dropped into a sand casting line and need to understand why their green strength numbers keep failing. I've been in both positions. The book itself is straightforward. The execution isn't. O.P. Khanna's text covers the full spectrum from molding materials through pouring, fettling, and inspection. The sand preparation chapter alone has enough detail that I've referenced it for fifteen years on production floor problems. The book doesn't romanticize anything. It gives you tables, procedures, and typical values. That's what you need when a batch of molds cracks during shakeout and your foreman is asking questions.
A Textbook Of Foundry Technology Ebook By O P Khanna
The ebook version circulates across a few educational platforms and document-sharing sites. Most of the PDFs I've seen are scans of the third or fourth edition, which means the formatting is sometimes ragged on technical diagrams. If you're reading on a phone, it's painful. A laptop or tablet works fine. The content hasn't changed substantially between editions for the core topics — mold design, gating systems, defect analysis. Here's something the book doesn't spell out clearly enough: green sand moisture content. Khanna gives you ranges, but the real number depends entirely on your silica sand grade and clay type. I ran into this problem at a small foundry in 2019. We were getting cold shuts consistently on a particular engine block casting. The textbook said our moisture was within spec at around 3.2 percent. It turned out our bentonite was older stock with reduced activity. Once I dropped moisture to 2.8 percent and adjusted the clay addition, the issue disappeared. The book would have pointed you at the ranges. Experience tells you the ranges are starting points, not targets. Another thing beginners miss: the chapter on riser design assumes ideal heat flow. Real castings have chill plates, different section masses, and mold materials that vary batch to batch. Khanna's modulus method works when the conditions match the assumptions. They rarely do. I've found that combining his approach with a simple feeding distance calculation based on local section thickness gives more reliable results than using modulus alone. The book covers modulus in detail. It doesn't emphasize the practical limit of what that calculation can do when your casting geometry is complex.
Defect analysis is where this book actually earns its shelf space. The chapters on pinhole porosity, shrinkage cavities, and misruns are detailed enough that I've used them to train new quality engineers. The defect trees are logical. You follow the symptom back to cause, and the book gives you probable reasons in order of likelihood. Sand inclusion, inadequate venting, wrong pouring temperature — all of it's there with supporting data. The book's weakness is its treatment of modern materials. Coreless induction melting is covered, but if you're working with grey iron specifically tuned for automotive brake components, you'll need supplementary references on inoculant timing and residual titanium effects. Khanna's text was written when foundry practice was less specialized. The fundamentals remain sound. The edge cases require additional research. For students, start with the molding and core making sections. Those chapters have the most direct application to lab work and introductory foundry practice. The metallurgy portions are useful but denser. Don't expect the book to solve every production problem you'll encounter. It's a reference, not a manual. The real learning happens when you take a concept from the page and watch what actually occurs in the foundry when someone does it slightly wrong.
Get the Full Details
The ebook is freely available through several academic document repositories. Search for the title along with the author's name. Make sure you're downloading from a source that provides a complete, readable file. Some versions skip the appendix tables, which are actually important for quick reference during casting design work.
