Showing posts with label Manufacturing. Show all posts
Showing posts with label Manufacturing. Show all posts

Monday, October 21, 2019

How Guitars Are Made

Whether you play one or just enjoy the sound, you may have wondered how guitars are made. Here are the steps:

With acoustic guitars especially, the non-electric type, different species of wood are important in terms of the sound quality. For the body of a guitar, makers typically use:

Top (sound board-the most important part)            Spruce or cedar
Back and sides                                                       Mahogany, alder, ash, or walnut
Neck                                                                       Maple, mahogany, koa, rosewood*

                                                                   This guitar is made of koa wood.. The grain is beautiful
                                                          https://en.wikipedia.org/wiki/Acacia_koa


*Rosewood has been under some controversy; it provides the best sound in a guitar, but there has been concern about over-use and whether sales should be banned: 
https://www.npr.org/2019/08/27/754509680/musical-instruments-to-be-exempt-from-restrictions-on-heavily-trafficked-rosewoo?utm_medium=RSS&utm_campaign=news


The neck is either hand-carved or cut using a computer-programmed cutter.

                                             Parts of guitars are largely the same, electric/acoustic
The steps in making a guitar:
1. Cut the top and back
2. Cut sound hole or holes in the top. A sort of reinforcing cord is applied at the rim of the cutout.  A pick guard may or may not be applied. This is, as you probably guessed, to protect the body of the guitar from being scratched by the pick you hold to strum the guitar, as well as dirt from the fingers like body oils or sweat..
3. Steam the sides to make them pliable, shape them, and let them dry in a mold so they hold the curved shape
4. Attach the sides with bracing to make a strong connection
5. Attach the neck, including the fingerboard and frets
    -if the guitar will have steel strings, a metal piece called a truss is fitted underneath the fingerboard for strength
6.  Attach the strings after filing grooves and adjusting the truss rod

The finish that coats the guitar will affect its tone. One choice, nitrocellulose is more flexible so allows a better sound. Another, polyurethane is also used often. Both finishes are applied with multiple coats.

Electric guitars are also made of wood, but usually painted colors rather than just clear-coated. Their construction is very similar to acoustic guitars.
                                                           The sides are held in place while the glue dries

                                                                  Inside of an electric guitar in progress


The strings on a guitar must be 'tuned' by loosening or tightening the strings by using the tuning pegs. A tuning 'fork' or pitchpipe can be used, or you can tune to another instrument that's correctly tuned.
Here someone shows how to tune a guitar: 


To play a guitar, some people simply use their fingers. Others use picks held with the thumb and first finger like these:
Others use picks that they 'wear' on their fingers: 



Check out these unique guitars:
                                                            This one was made using a 3D printer. Wonder what kind of tone it has, though....


Check out Guitarist Juha Jarvinen on YouTube. Here he is playing a solo from 'Comfortably Numb' by Pink Floyd:  
https://www.bing.com/videos/search?q=+acoustic+guitar+solo&&view=detail&mid=0C91CA1525A35973C3880C91CA1525A35973C388&&FORM=VRDGAR   
There are other kinds of guitars as well: A 'Hawaiian lap steel guitar" looks like this, has a distinctively different sound, and is played laid across the artist's lap: 


Mariachi bands include a regular sized acoustic guitar plus a large guitarron, or bass guitar That guitar is much larger than a traditional guitar, and bows out in the back. If you see a guitarron player and wonder why he seems to hold the guitar awkwardly, it's because it can't lay against his body like a normal guitar. Learn a little about Mariachi bands here:  
https://www.tripsavvy.com/mexican-mariachi-music-1588856

Here is a video from the Taylor Guitar Company, one of the largest guitar makers in the U.S., on their process:  


And that's how it's made, Guitar Version.

Monday, June 4, 2018

Ice Cream!

Summer!! Time for ice cream.


It's likely that ice cream has been around for thousands of years in some form or another. We know it was made in the 1500s in Europe, and by the 1700s it was introduced in the U.S.


Ice Cream Trivia: The University of Guelph in Toronto, Canada, teaches Ice Cream Science.


There was a long-standing myth that Thomas Jefferson introduced it to America, but while it was served in his home, he wasn't the first one to do so.


Here is the recipe his French chef used:
Thomas Jefferson's Vanilla Ice Creammakes about 4 pints (2 quarts, 1/2 gallon)
6 yolks of eggs
1/2 lb sugar (1 1/4 cups)
2 bottles (quarts) of good cream (4 pints)
1 vanilla bean

Mix the yolks and sugar together. Put the cream on a fire in a casserole, first putting in a stick of vanilla. When near boiling, take it off and pour it gently into the mixture of eggs and sugar. Stir it well. Put it on the fire again, stirring it thoroughly with a spoon to prevent it's sticking to the casserole. When near boiling, take it off and strain it thro' a towel. Put it in the Sabottiere* then set it in ice an hour before it is to be served. Put into the ice a handful of salt. Put salt on the coverlid of the Sabotiere and cover the whole with ice. Leave it still half a quarter of an hour. Then turn the Sabottiere in the ice 10 minutes open it to loosen with a spatula the ice from the inner sides of the Sabotiere. Shut it & replace it in the ice open it from time to time to detach the ice from the sides when well taken (prise) stir it well with the spatula. Put it in moulds, justling it well down on the knee. Then put the mould into the same bucket of ice. Leave it there to the moment of serving it. To withdraw it, immerse the mould in warm water, turning it well till it will come out and turn it into a plate.
*The Sabottiere is the inner cannister of what we now know as an ice cream maker.


Here's what a basic homemade ice cream recipe includes now:


See what's listed on an ice cream label                                                                 

                                                                          A serving is 1/2 a cup? That's cute.
Here's how ice cream is made in a factory:
 
  • 1. Mixing of ingredients: This will include milk or cream, but also various ingredients to make it smooth. It may also include eggs for richness. The mixing step is most important, to get rid of ice crystals that would break it down.
  • 2. The mixture is homogenized and pasteurized: It's heated to kill any bacteria present
  • 3. Colors and flavors are added to the mixture
  • 4. It is aged: the ice cream is allowed to cool to 40 degrees F for four hours or overnight, this helps it freeze better so it is smoother
  • 5. Freezing the mixture
  • 6. Adding sauce ingredients, such as caramel or chocolate syrup
  • 7. Hardening
  • 8. If the ice cream will be shaped into bars or put into cones, it's done now
  • 9. Packaging
 In a factory, sometimes the vats hold up to 3000 gallons.

In 2002, more than $20 Billion was spent on ice cream. California is #1 in ice cream sales.





































 
 




Tuesday, January 16, 2018

Microblog: Minnesota Companies-Polaris Industries

Another large and successful business based in Minnesota is Polaris Industries:: The symbol of the North Star is their logo:
In 1945, a man and his friends living in Roseau, Minnesota, began a business fixing farm machinery, but they also came up with a vehicle that could get people out to their hunting shacks in the fierce winters of Northern Minnesota when their cars could not, hence the birth of the snowmobile. Here's a synopsis of their history, from their website:


The Polaris spirit can be traced back to co-founders Edgar Hetteen, his younger brother Allan and his close friend David Johnson. The hard-working trio started the forerunner of Polaris—Hetteen Hoist & Derrick—in 1945 in tiny Roseau, Minnesota. With World War II raging and metal scarce, their skill at repairing farm machinery quickly earned them loyal customers.But it was their tinkering with a better way to get to remote hunting shacks in deep snow that earned them a place in history: Our co-founders developed an early snowmobile in 1955. To prove the new vehicles weren’t just frivolous toys, Edgar and three friends embarked on a 1,200-mile journey across the Alaskan wilderness to demonstrate the vehicle’s durability. They lugged 900 pounds of provisions on toboggans and endured minus-40 degree temperatures to complete the journey in 12 days.


And now, Polaris Industries are a leading designer and manufacturer of snowmobiles, but also the Indian and Victory motorycles and ATVs as well. Their sales in 2015 were about $4.7 Billion, and Polaris employs about 8,000 people. Currently, their headquarters are in Medina, Minnesota, with manufacturing still in the Roseau location. It has manufacturing and distribution centers in 9 cities, in the U.S., one of which is in Alabama-not a lot of snow there!


As to careers with this company, Polaris needs people in these areas:
Engineering
Robot Programming
Data Analyst
Designers
Assemblers
Sales
Marketing
Financial
Human Resources
Legal
Web Design


For current employment opportunities, click on this link:  https://polaris.gr8people.com/index.gp?method=cappportal.showAuthPortalLandingPage