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Author Topic: Vernier Calipers  (Read 15614 times)
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ahmedelshfie
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on: April 07, 2010, 02:28:07 am » posted from:,,Brazil

This applet written by Fu-Kwun Hwang
Edited by Loo Kang WEE and Wolfgang Christian
Modified by myself
Original simulation : http://www.compadre.org/osp/items/detail.cfm?ID=9707

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* Vernier Calipers.jpg (16.19 KB, 662x304 - viewed 443 times.)
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ahmedelshfie
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Reply #1 on: April 16, 2010, 11:39:03 pm » posted from:,,Brazil

Caliper
A caliper (British spelling also calliper) is a device used to measure the distance between two symmetrically opposing sides. A caliper can be as simple as a compass with inward or outward-facing points. The tips of the caliper are adjusted to fit across the points to be measured, the caliper is then removed and the distance read by measuring between the tips with a measuring tool, such as a ruler.
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ahmedelshfie
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Reply #2 on: April 16, 2010, 11:40:11 pm » posted from:,,Brazil

Nomenclature variants (colloquial only)
A plurale tantum sense of the word "calipers" coexists in natural usage with the regular noun sense of "caliper". That is, sometimes a caliper is treated cognitively like a pair of glasses or a pair of scissors, resulting in a phrase such as "hand me those calipers" or "those calipers are mine" in reference to one unit. However, this usage is mostly colloquial and the regular noun sense of caliper usually dominates, especially in writing. There is no rigorous grammatical logic to defend the plurale tantum sense; it is just the way language sometimes naturally flows colloquially.

Also existing colloquially but not in formal usage is referring to a vernier caliper as a "vernier".
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ahmedelshfie
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Reply #3 on: April 16, 2010, 11:43:55 pm » posted from:,,Brazil

History
The earliest caliper has been found in the Greek Giglio wreck near the Italian coast. The ship find dates to the 6th century BC. The wooden piece already featured a fixed and a movable jaw. Although rare finds, caliper remained in use by the Greeks and Romans.

By the Han Dynasty (202 BC – 220 AD), the Chinese also used the sliding caliper, which they made of bronze and manufactured each tool with an inscription of the day, month, and year it was made (according to Chinese era names and their lunar calendar).

The modern vernier caliper, reading to thousandths of an inch, was invented by American Joseph R. Brown in 1851. His Brown and Sharpe company inaugurated true precision manufacture in the United States. It was the first practical tool for exact measurements that could be sold at a price within the reach of ordinary machinists.


* 220px-DigitalCaliperEuro.jpg (5.51 KB, 220x165 - viewed 267 times.)

* 220px-InsideCalipers.jpg (8.01 KB, 220x157 - viewed 141 times.)

* 220px-Messschieber.jpg (10.61 KB, 220x220 - viewed 349 times.)

* 220px-OutsideCalipers.jpg (9.22 KB, 220x159 - viewed 191 times.)

* virner.jpg (50.59 KB, 1602x597 - viewed 67780 times.)
« Last Edit: October 20, 2010, 06:14:37 pm by ahmedelshfie » Logged
ahmedelshfie
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Reply #4 on: April 26, 2010, 07:55:49 pm » posted from:,,Brazil

* an object (Blue) for the internal jaws to measure width of an object with slider to control width of the object and simple drag action to control position of object.
* an object (Green) for external jaws to measure internal diameter of a cylinder for example with slider to control dimensions of the cylinder.
* checkbox for answer to show the meaning of reading on the main scale and the vernier scale with zero error calculations if any.
* drop down menu of the various common vernier scales for sense making and additional testing out by learners their ideas of how vernier works.
* fine <> control buttons for learners to manipulate the model with single incremental precision
* slider control for fast changes in the vernier measurement
* reset button to bring simulaton back to original (default)
  setting.
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Reply #5 on: April 26, 2010, 07:59:45 pm » posted from:,,Brazil

Explain by video about vernier Calipers http://www.youtube.com/watch?v=F4Mb6UPMFY0
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ahmedelshfie
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Reply #6 on: April 27, 2010, 08:40:52 pm » posted from:,,Brazil

Inside caliper
The inside calipers are used to measure the internal size of an object.
* The upper caliper in the image (at the right) requires manual adjustment prior to fitting, fine setting of this caliper type is performed by tapping the caliper legs lightly on a handy surface until they will almost pass over the object. A light push against the resistance of the central pivot screw then spreads the legs to the correct dimension and provides the required, consistent feel that ensures a repeatable measurement.
* The lower caliper in the image has an adjusting screw that permits it to be carefully adjusted without removal of the tool from the workpiece.

Outside caliper
Outside calipers are used to measure the external size of an object.
The same observations and technique apply to this type of caliper, as for the above inside caliper. With some understanding of their limitations and usage these instruments can provide a high degree of accuracy and repeatability. They are especially useful when measuring over very large distances, consider if the calipers are used to measure a large diameter pipe. A vernier caliper does not have the depth capacity to straddle this large diameter while at the same time reach the outermost points of the pipe's diameter.
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Reply #7 on: June 21, 2010, 06:23:34 pm » posted from:SAO PAULO,SAO PAULO,BRAZIL

A nother version for Vernier Calipers
Author:Fu-Kwun Hwang original, remix by lookang&Modified layout by Ahmed
Can found too on Ejs open source Vernier calipers

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  • Please feel free to post your ideas about how to use the simulation for better teaching and learning.
  • Post questions to be asked to help students to think, to explore.
  • Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!


* Vernier1.gif (18.13 KB, 608x628 - viewed 154 times.)
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Reply #8 on: June 26, 2010, 09:09:00 am »

i like the credits menu at the top left corner of the applet Smiley

the depth of the vernier caliper is not given the space to show in the new layout?
check it Cheesy
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Reply #9 on: June 26, 2010, 01:12:33 pm »

i realised the new layout is from me, note i have already made changes to make the view include the depth of the vernier caliper.
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=684.0
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Reply #10 on: June 27, 2010, 12:23:30 am » posted from:Uberaba,Minas Gerais,Brazil

I will check it and upload jar file again after fix error in size
Thanks  Smiley
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Reply #11 on: October 09, 2010, 02:41:25 am » posted from:SAO PAULO,SAO PAULO,BRAZIL

Registed user can get files related to this applet for offline access.
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This applet design by prof Hwang using JDK1.0.2
Original URL Vernier






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« Last Edit: October 20, 2010, 06:18:36 pm by ahmedelshfie » Logged
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The most important medicine is tender love and care. ..."Mother Teresa(1910-1997, Roman Catholic Missionary, 1979 Nobel Peace Prize)"
 
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