Home | Gallery | Forums | Ads | Store ANTIQUETRACTORS.COM

PartsASAP LogoCompany Logo Antique Tractor Resource Page

   Allis Chalmers Case Farmall IH Ford 9N,2N,8N Ford
   H. Ferguson John Deere Massey Minn. Moline Oliver

Tractor Manuals
Tractor Parts
Engine Kits
Classified Ads
Photo Ads

Discussion Forums
Collector Profiles
Show Guide
Guest Book

Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads

Research Center
Tractor Values
Production Numbers
List Prices
Tune-Up Specs
3-Point Specs
Spark Plug List
Torque Values
Torque Specs
Plow Specs
Clubs & Pubs
JD New Generation
JD HP Chart

Today in History
Pic of the Day
Table of Contents

Related Sites
Garden Tractors
The Tractor Shed
Ford 9N/2N/8N Club
Yesterday's Tractors
More Sites

YT Article

Reprinted Article
Measuring with Calipers

Calipers, either spring or firm-joint types, are convenient tools for measuring a number of jobs which are not required to be extremely accurate. Firm-joint calipers have two legs fastened together with a rivet or bolt of special design. To give a smooth joint, thin fiber-washers are interposed between the legs, and when purchasing calipers this point should be looked for.

The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work.

Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blows (though light) tend to burr the edges of the joint. Care should be taken when using calipers to hold them square across the job, or an incorrect reading will be obtained. The interference between the work and the instrument should be very slight, as distortion of the legs occurs if force is used. The application of calipers for good results calls for a certain amount of practice.

Spring calipers are provided with an adjusting screw which moves the legs against the tension of the spring. The chief advantage of this over the firm-joint type is ease of adjustment. Quick nuts are fitted to many spring dividers, and they consist of a nut which is split completely in two and held by a conical sleeve under the pressure of the spring. If this pressure is removed by holding the legs together with the fingers, the nut is released from the screw and can be moved into any position along its length without being rotated. This is particularly advantageous in inspection work, where many varying diameters have to be checked.

Either inside or outside calipers can be set to a ruler or to a standard part, the latter being the most accurate. If the standard has a very smooth surface and the work surface is less smooth, more resistance will be offered by the work to the movement of the calipers, and allowance has to be made for this.

Mistakes can easily arise by accidentally altering the setting of these tools when laying them down after checking the job, and it is a good plan, particularly with spring dividers, to check the setting each time before checking the work.

The use of calipers is not confined to cylindrical work. They can often be employed to advantage in checking rectangular holes, parallel faces and so on. Convenient sizes for the tool kit are 3 inch and 6 inch.

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy