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David Hewitt

David Hewitt has been a valuable resource on the Internet Clayart discussion group and to Digitalfire Corp. and our customers out of regard for his help we are assisting him in marketing his software and books.
See the bottom of this page more information.

• C.Eng, MIMechE, BSc(London)
• Industrial experience mostly (34 years) with Monsanto on chemical plant - maintenance, design, construction and project work. Now retired.
• Pottery experience
  "I work with stoneware and porcelain. All work is oxidized in an electric kiln. Temperature of glazes used is ^6 to ^9. Started as a hobby in 1975". Active member of South Wales Potters. Associate Member of the Craft Potter's Association. Work sold locally. Items bought by Newport and Bristol museums.
• Various articles published in Ceramic Review in conjunction with Mike Bailey.
  • Understanding Your Glaze Tests (6 articles)
    The articles largely revolve around the use of triaxial phase diagrams and identifying the eutectic point for a given temperature and basic oxide combination. Also now included is a section on 'Those Unlabelled Bags and Buckets'
  • Calculating Crazing (2 articles)
  • Oil Spot Glazes
  • Glaze Spectrum (Opacifier test series)
  • Reviews of glaze software: 'Matrix', 'Foresight'
  • A Question of Identity - Those Unlabelled Bags and Buckets

Software From David Hewitt

The GLAZE WORKBOOK

Spreadsheet files for PC's with versions that can be loaded into MS Excel (Ver. 5 or 7 and above), Lotus 123 (Release 5 and above), QuatroPro (Ver. 7 and above) and MS Works for Windows (Ver 4.0 and above).

• Recipe to Formula with results in Unity Formula and % Weight, Seger Ratios, % Mol Parts and Coefficient of Expansion.
• Formula to Recipe starting from Unity Formula input.
• UK and North American RM's. All can be altered or added to.
• UK and North American RM's. All can be altered or added to.
• RM Mol Weight Calculator
• Coefficient of Expansion Calculator using 7 different Ceramist's coefficients. Linear and % Expansion
• Unity Formula from Triaxial Graph Point
• Limit Formula for commonly used oxides.
• Easy to use. Ideal for both the Craft Potter and the Student.
• Demonstration versions can be sent on request. These are attached to an email and are subject to the internet gateways and the receiver's software being able to accept files of around 400Kb. Request by email to:- david@dhpot.demon.co.uk

Understanding Your Glaze Tests

Analysing a recipe is one thing, but what do you do with the information so obtained? To help answer this question Mike Bailey and David Hewitt wrote a series of articles for Ceramic Review. These, and other articles that they have written, have been put together in a 38 page A4 booklet. How to plot glazes on Triaxial Phase Equilibrium Diagrams and interpret these. Coefficients of Expansion and glaze fit. Glaze testing and much more.

• Groping in the dark? - A way ahead
• Some theory helps practical understanding
• Some practice, testing a set of glazes
• Plotting and predicting
• The basic fluxing and colouring oxides
• Calculating crazing
• Calculating crazing - continued
• Computer programs for Potters
• Those Unlabelled Bags and Buckets

For more details on all of the above see web page http://www.dhpot.demon.co.uk

How to Order and Prices

Compose mail to David Hewitt at david@dhpot.demon.co.uk specifying what you would like and Mr. Hewitt will provide instructions on payment and informatiom on shipment.

Read David's articles on "Calculating Crazing" and Those Unlabelled Bags and Buckets

Box 432, Cornwall, PE, C0A 1H0 Canada Phone Phone: (406) 662-0136

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