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The Offcial Machinist Thread: Revised 01/04/2014

A place to ask general spud cannon related questions.
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 25, 2011 3:46 am

This is not ideal but better than nothing.

This is better ;)
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Unread postAuthor: Crna Legija » Thu Aug 25, 2011 3:56 am

jackssmirkingrevenge wrote:This is not ideal but better than nothing.

This is better ;)



lol i doubt he knows how to read a vernier caliper, lol i didn't, 2 days ago :oops:
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 25, 2011 4:12 am

There's nothing to it ;)

What do they teach you in science classes then? Do you watch episodes of Braniac :roll: :D
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Unread postAuthor: Labtecpower » Thu Aug 25, 2011 4:49 am

Do you watch episodes of Braniac :roll: :D


Actually I did :D still had a 9,3 out of 10 at central exams.

I didn't know how to read a vernier caliper until previous school year.. :roll:
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Unread postAuthor: Crna Legija » Thu Aug 25, 2011 5:21 am

jackssmirkingrevenge wrote:What do they teach you in science classes then? Do you watch episodes of Braniac :roll: :D


Defiantly didn't get tough how to use a vernier anything, i remember watching mythbusters a few times, and that i had already seen though's episodes :lol:



I didn't know how to read a vernier caliper until previous school year..


Not surprised I bet the majority of active members wouldn't know how to use one too. There's no need to unless you have your own mill/lathe or use one for your job even then the .01-.02mm you get from a digital one is good enough for most things.
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 25, 2011 7:53 am

I used a micrometer screw gauge as part of my previous employ measuring the thickness of stretch wrap during incoming inspection, however I remember learning about reading a vernier scale during physics class before the age of 16.
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Unread postAuthor: LeMaudit » Thu Aug 25, 2011 8:07 am

You all should learn how to use a scale rule. Then everything become clear...
They don't teach that in school nowadays? How peculiar... I learned it...

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Unread postAuthor: LovableAirGuns » Thu Aug 25, 2011 9:09 am

Calipers arnt that hard to read once you know how to do it, i got tuaght by my mums friend. At our school we learn how to use that equipment during metal tech studies.
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Unread postAuthor: dewey-1 » Thu Aug 25, 2011 9:13 am

The good old slide rule.
Went through 4 years of Electronics education using one of those.

Some people today complain about their digital calculators, just try an analog calculator for comparison!

You would be surpised at how different occupations use calipers for measurements besides machinists.

A caliper is a very good investment for any spudder.

When most people ask for ID or bore measurements, the best results are using a caliper. Not just saying it is 1/2 inch copper pipe.
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Unread postAuthor: inonickname » Thu Aug 25, 2011 9:15 am

Normally I use digital calipers. Simply more accurate and quicker than reading verniers. I do own a pair though, and reading them properly is a useful asset.
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 25, 2011 9:26 am

dewey-1 wrote:You would be surpised at how different occupations use calipers for measurements besides machinists.


Definitely, I have a micrometer syringe in the lab for microlitre dispensing and when I worked for the soft drink industry, the knob we used on the mixer to adjust syrup:watrer ratio also had a vernier scale, though that was eventually replaced with a digital mixer that automatically adjusted according to its own measurement. Happy days :)
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Unread postAuthor: velocity3x » Thu Aug 25, 2011 10:51 am

jazzman56 wrote:how would i go about measuring this inside diameter, i am assuming that i can't use a ruler :) .
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Attachments
Telescopic Bore Gause.jpg
Certainly cheaper than a thelscopic bore indicator, but much more accurate than a caliper.
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Bore Indicator.jpg
Always my first choice for an accuract bore.
Bore Indicator.jpg (2.57 KiB) Viewed 494 times
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Unread postAuthor: dewey-1 » Thu Aug 25, 2011 11:25 am

LeMaudit wrote:You all should learn how to use a scale rule. Then everything become clear...
They don't teach that in school nowadays? How peculiar... I learned it...

Image
http://www.hpmuseum.org/srinst.htm


For those interested;

Shown is: 4.220 times 1.660 = 7.000 or 7.00 divided by 1.660

Actually 4.220 times 1.660 = 7.0052 on my TI-35 calculator.
3 digit decimal is about the best resolution available on a slide rule.

What is the amount of accuracy of the slide rule here? About 99.926%


Slide rule were used by a lot of Engineers during the 1960's.
Got us to the moon did it it not?
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Unread postAuthor: jrrdw » Thu Aug 25, 2011 5:08 pm

jazzman56 wrote:Is there any chance of getting a piston valve (barrel sealer) machined/lathed for a 1 inch brass tee. (sorry not quite sure of the inside diameter). I would like it to seat at a low pressure (so i can use a bike pump).

Something like daniel0663's piston

Image


EDIT: JSR how would i go about measuring this inside diameter, i am assuming that i can't use a ruler :) .

Thanks Jazzman


Send the piston, o-ring and the tee to be used so you can get a custom fit. I can do this for you if you wish.
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Unread postAuthor: Gun Freak » Thu Aug 25, 2011 5:28 pm

I'm thinking about having somebody machine an aluminum block for me, it is 3/8" thick, 1.5" long and 3/4" tall (approximately, it will be actually a bit more) this is a simple drawing, can I get a quote from a few people?
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