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  1. Home
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  3. Part bending in CNC turning, the Reality

Part bending in CNC turning, the Reality

16 June, 2016
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By Niraj M Wanikar, Chief Editor, CNCTimes.com, 2016-06-16 14:28:00

This blog is written by Dasarathi GV, Director-Applications, Cadem Technologies Pvt. Ltd. 
Cadem makes software products for improving profits in CNC machining:
1. Cycle Time reduction and Programming
2. CNC machine monitoring and DNC
3. CNC skill development and education.

CNC

Part bending in turning – the Reality

Let’s say you want to turn the part in fig. A from a cylindrical raw material.
If you turn without holding the free end in a tailstock, would you get the part shown in fig. 1 or the one in fig. 2 ?

cnc-turning-part-bending

Most people’s answer would be fig. 1, but the video below shows you the correct answer.

Video source – Cadem NCyclo Turn, CNC training software

 

Etc

What is Proof and ABV on alco(hic!)hol bottles ?

Alcohol by Volume, or ABV, is the percentage of ethyl alcohol in the total volume.
You’ll find ABV Alcohol by Volume is also written as ABV, V/V, or alc/vol.

All these mean the same thing – 40 ml of alcohol in every 100 ml of contents (the other 60 ml being mainly water): 40 % V/V, 40 % ABV, Alc. 40% by vol, 40 % vol, 40% alc/vol.

vv-1       vv-2 vv-3 vv-4

Proof is a more complicated and confusing term.
The term ‘Proof’ originated in England 500 years ago. Rum was taxed at different rates depending on its alcohol content. The rum was tested by soaking a pellet of gunpowder in it. If the gunpowder could still burn after the soaking, the rum was rated as ‘above proof’ and taxed at a higher rate. Gunpowder would not burn after soaking in rum that had less than 57.15% ABV. So rum that contained this percentage of alcohol was said to be “100° (one hundred degrees) proof”. To convert Proof to ABV, just multiply by 0.5715.

See the label below, and note the year of manufacture. It’s 86 % ABV (that’s a crazy amount – the average whisky is about 40 %), and the label says “flammable”.

proof-2

In the US, proof merely meant 2 x ABV. So if a bottle said 100 % Proof, it meant 50 % ABV.

proof1 proof2

Very confusing, this Proof business.

Happily for us tipplers of today, ABV, which is easy enough to understand even with faculties dulled by alcohol, is the standard used world over.
Here’s a page that has ABV for various types of liquor.

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