The workshop companion : a collection of useful and reliable recipes, rules, processes, methods, wrinkles, and practical hints for the household and the shop by Phin John 1830-1913

Author:Phin, John, 1830-1913
Language: eng
Format: epub
Tags: Workshop recipes
Publisher: New York : Industrial Publication Co.
Published: 1879-03-25T05:00:00+00:00

for producing tlie smootli but dull surface ; after wHcli, sleuder square pieces of the second gritstone and of snake-stone are used Avith water as a pencil, and then fine emery and putty powder on sticks of wood ; but the work is exceedingly tedious, and requires very great care, that the artistical character of the work, and any keen edges that may be required are not lost in the polishing.

Metals—Polishing.

Metals are polished either by biirnishing or buffing. The process of burnishing consists in rubbing down all the minute roughnesses by means of a highly polished steel or agate tool—none of the metal being removed.

The action of the burnisher api:)ears to dejjend ui3on two circumstances ; first, that the harder the material to be l^olished the greater lustre it will receive ; the biirnisher is, therefore, commonly made of hardened steel, which exceeds in hardness nearly every metallic body. And secondly, its action depends on the intimacy of the contact betwixt the burnisher and the work ; and the pressure of the brightened burnisher being, in reality, from its rounded or ellii^tical section, exerted upon only one mathematical line or f)oint of the "work at a time, it acts with great j^ressure and in a manner distinctly analogous to the steel die used in making coin; in which latter case the dull but smooth blank becomes instantly the bright and histrous coin, in virtue of the intimate contact produced in the coining i:)ress between the entire surface of the blank and that of the highly polished die.

It by no means follows, however, that the burnisher will produce highly finished surfaces, unless they have been previously rendered smooth, and proper for the a'pplication of this instrument, as a rough surface, having any file marks or scratches, will exhibit the original defects, notwithstanding that they may be glossed over with the burnisher which folloAvs every irregularity; and excessive jsressure, which might be expected to correct the evil as in coining, only tills the work with furrows, or i^roduces an irregular indented surface, which by workmen is said to he full of utters.

Therefore, the greater the degree of excellence that is required in burnished works, the more carefully should they be smoothed before the application of the burnisher, and this tool should also be cleaned on a buff stick with crociis iiii-

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