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Easy Java Simulations (2001- ) => misc => Topic started by: ahmedelshfie on April 07, 2010, 02:28:07 am



Title: Vernier Calipers
Post by: ahmedelshfie on April 07, 2010, 02:28:07 am
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


Title: Re: Vernier Calipers
Post by: ahmedelshfie on April 16, 2010, 11:39:03 pm
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.


Title: Re: Vernier Calipers
Post by: ahmedelshfie on April 16, 2010, 11:40:11 pm
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".


Title: Re: Vernier Calipers
Post by: ahmedelshfie on April 16, 2010, 11:43:55 pm
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.


Title: Re: Vernier Calipers
Post by: ahmedelshfie on April 26, 2010, 07:55:49 pm
* 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.


Title: Re: Vernier Calipers
Post by: ahmedelshfie on April 26, 2010, 07:59:45 pm
Explain by video about vernier Calipers http://www.youtube.com/watch?v=F4Mb6UPMFY0


Title: Re: Vernier Calipers
Post by: ahmedelshfie on April 27, 2010, 08:40:52 pm
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.


Title: Re: Vernier Calipers
Post by: ahmedelshfie on June 21, 2010, 06:23:34 pm
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 (http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=684.0)


Title: Re: Vernier Calipers
Post by: lookang on June 26, 2010, 09:09:00 am
i like the credits menu at the top left corner of the applet :)

the depth of the vernier caliper is not given the space to show in the new layout?
check it :D


Title: Re: Vernier Calipers
Post by: lookang 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


Title: Re: Vernier Calipers
Post by: ahmedelshfie on June 27, 2010, 12:23:30 am
I will check it and upload jar file again after fix error in size
Thanks  :)


Title: Re: Vernier Calipers
Post by: ahmedelshfie on October 09, 2010, 02:41:25 am
This applet design by prof Hwang using JDK1.0.2
Original URL Vernier (http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=52.0)




(http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=1513.0;attach=3501)