Standards of Length And Their Practical Application a Rsum Covering the Met
Standards of Length And Their Practical Application a Rsum Covering the Met
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In our eReader you can find the full English version of the book. Read Standards of Length And Their Practical Application a Rsum Covering the Met Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Standards of Length And Their Practical Application a Rsum Covering the Met
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If they are made as described, the steel must of course be soft, and a very little use would soon destroy their accuracy. It is there- fore requisite that working gauges should be hardened. The process of doing so, however, changes their form and dimensions slightly, so as to impair their accuracy. To get over this diffi- culty, hardened gauges are made somewhat larger than the stand- ard size. The Pratt & Whitney Company have devised a plan to grind these gauges, after they are hardened, to th...e exact size, form and pitch. To do this the gauges are put into a lathe and a rapidly revolving steel disc or wheel is attached to the tool- holder which is moved by the lead screw, the pitch of which con- forms exactly to that of the screw of the gauge. Diamond dust is used on this disc for grinding the hardened threads, and the exact size is reproduced from a soft gauge, whose dimensions have not been changed by hardening.
For the most exact standards of reference, The Pratt & Whit- ney Company recommends the unhardened gauges.
What to read after Standards of Length And Their Practical Application a Rsum Covering the Met?
You can find similar books in the "Read Also" column, or choose other free books by Pratt Whitney Company to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
If they are made as described, the steel must of course be soft, and a very little use would soon destroy their accuracy. It is there- fore requisite that working gauges should be hardened. The process of doing so, however, changes their form and dimensions slightly, so as to impair their accuracy. To get over this diffi- culty, hardened gauges are made somewhat larger than the stand- ard size. The Pratt & Whitney Company have devised a plan to grind these gauges, after they are hardened, to th...e exact size, form and pitch. To do this the gauges are put into a lathe and a rapidly revolving steel disc or wheel is attached to the tool- holder which is moved by the lead screw, the pitch of which con- forms exactly to that of the screw of the gauge. Diamond dust is used on this disc for grinding the hardened threads, and the exact size is reproduced from a soft gauge, whose dimensions have not been changed by hardening.
For the most exact standards of reference, The Pratt & Whit- ney Company recommends the unhardened gauges.
What to read after Standards of Length And Their Practical Application a Rsum Covering the Met?
You can find similar books in the "Read Also" column, or choose other free books by Pratt Whitney Company to read onlineMoreLess
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