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I - Se o serramento for manual, manter o ritmo de aproximadamente 90 golpes por minuto e a pressão durante o avanço e retorno da serra. Usar a serra em todo o seu comprimento, movimentando somente os braços. Ao final da operação, diminuir a velocidade e a pressão sobre a serra para evitar acidentes.
II - O torneiro ou o fresador de produção não podem ficar preocupados com as dimensões da barra que eles vão trabalhar, nem perder tempo cortando o material no tamanho adequado. Do ponto de vista da empresa, é importante que não se desperdice matéria-prima. Isso leva à necessidade de cortar o material de maneira planejada, com as dimensões mínimas e suficientes para a execução da usinagem.
III - O Cinzel funciona como um conjunto de duas alavancas articuladas. Como consequência, o corte se faz mais facilmente quando a chapa é encostada mais próximo da articulação, o que exige menos força para o corte.
IV - Nem sempre na operação de corte, é possível fazê-lo com a tenaz ou a guilhotina. Isso acontece quando é preciso cortar materiais de menor volume em pedaços menores destinados à usinagem.
V - Para facilitar o corte do material, o cinzelamento é muitas vezes feito após o serramento. O resultado da operação de cinzelamento é rústico.
Assinale a alternativa CORRETA:
I - Segundo a norma NBR 8191, que se baseia na norma DIN 2197, os machos destinados à abertura de roscas manualmente são fabricados em jogos de 04 peças.
II - O roscamento com machos pode ser executado manualmente, com o auxílio de um desandador, ou em modo automático, em máquinas como rosqueadeiras, fresadoras, furadeiras ou tornos com acionamento mecânico ou CNC.
III - O primeiro macho destinado à abertura de roscas manualmente é denominado macho de pré-corte (desbastador), identificado pela letra “V” ou por um anel riscado na haste.
IV - Os machos destinados ao roscamento na máquina são fabricados em peça única e têm o comprimento total maior que o macho manual.
Sobre as assertivas acima, é CORRETO o que se afirma em:
( 1 ) Placa universal
( 2 ) Placa de arraste
( 3 ) Ponto rotativo
( 4 ) Luneta fixa
( 5 ) Luneta móvel
( ) Esse acessório tem grande utilidade quando pretendemos tornear eixos longos de pequenos diâmetros, pois atua como mancal, evitando que a peça saia de centro ou vibre com a ação da ferramenta.
( ) Utilizado nas operações de torneamento que requerem uma fixação entre pontas no torno.
( ) Equipamento muito comum nos trabalhos de torneamento. Possui 3 castanhas que efetuam o aperto da peça simultaneamente e uma consequente centragem. Pode efetuar fixação em diâmetros internos e externos.
( ) Usada no torneamento de peças fixadas entre pontos, onde se pretende manter uma maior concentricidade no comprimento total torneado.
( ) É utilizada em eixos de pequenos diâmetros, sujeitos a flexões e vibrações na usinagem. Serve também como mancal e deve ser montada sempre junto da ferramenta, para evitar vibrações e flexões, pois anula as forças de penetração da ferramenta.
Marque a alternativa que contém a sequência CORRETA na ordem de cima para baixo:
I - Para a medida do comprimento do parafuso, considera-se o comprimento do corpo com a medida da cabeça.
II - Porca sextavada ou hexagonal possui geometria semelhante ao parafuso de cabeça sextavada, ou seja, para apertá-la ou desapertá-la, devem-se utilizar as chaves de boca ou estrela. É muito utilizada para fixação de conjuntos mecânicos ou estruturas em geral, desde que o espaço permita o manuseio das chaves de aperto e desaperto.
III - A porca castelo é normalmente fabricada em formato hexagonal (sextavada), e em cada face possui um canal passante que deve coincidir com um furo feito no sentido radial no eixo ou parafuso, para que possa ser inserida uma cupilha entre as duas peças, conferindo o travamento delas.
IV - A chaveta é um elemento de fixação fabricado em aço de médio teor de carbono, que trabalha encaixado em um canal comum ao eixo e a outro elemento mecânico encaixado nele, como uma polia, uma roda dentada etc. Sua forma, em geral, é retangular ou hexagonal, dependendo da norma que estiver sendo aplicada ao equipamento. A chaveta tem por finalidade servir como trava, como fixadora ou como elemento de arraste entre os elementos mecânicos ligados.
Assinale a alternativa CORRETA:
I. Na montagem 01 o furo não tem afastamento inferior, tendo como tolerância do furo +0,028 mm e na montagem 02 o eixo só tem afastamento inferior, tendo como tolerância do furo 0,027 mm.
II. O Campo de tolerância é a diferença entre as dimensões máxima e mínima, sendo definido pela magnitude da tolerância e sua posição relativa em relação à linha zero.
III. Na montagem 01 o furo tem afastamento superior de +0,028 mm, sendo a tolerância do furo da montagem 01 menor que a tolerância do furo da montagem 02.
IV. A montagem 01 tem como tolerância do furo 0,049 mm e a montagem 02 o furo tem como tolerância 0,042 mm.
Marque a alternativa que contém a resposta CORRETA:
Em relação à conversão de medidas, faça a conversão de 0.343” (trezentos e quarenta e três milésimos de polegada) para polegada fracionária fazendo todas as simplificações possíveis e assinale a alternativa CORRETA:
Marque a alternativa CORRETA.
Marque a alternativa que contém a leitura CORRETA do paquímetro.
Why Climate Change Could Mean More Delayed Flights
No one enjoys a delayed flight, but as our weather gets warmer, we can expect more of them.
That's according to experts, who say that the heat of the summer might cause more delays.
Bloomberg looked at US data for flight delays at airports in Chicago and New York from June to August in 2022 and from January to March in 2023. It found that there were more delayed flights in the summer months at both airports.
When the temperature rises above 39 degrees Celsius, things get very difficult for airlines, Bijan Vasigh, a professor at Embry-Riddle Aeronautical University in the US, told Bloomberg.
The air is thinner when it gets hot and that makes it harder for planes to take off. In thinner air there is not as much lift, so more power is needed.
When they need more power, it helps to have a lighter airplane.
That might mean pilots have to make last-minute decisions to reduce the weight on board by dumping fuel, passengers or baggage — meaning the plane will probably be delayed.
The problem gets worse at airports that are at a higher altitude where the air is already thinner, and at airports with short runways, since planes need more space to get up to a high speed.
But thin air is not the only problem. Smoke from wildfires — that have been happening all around the world in the summer of 2023 — can also cause flights to be delayed and canceled.
Of course, the summer is also a busy time when millions of people fly, and weather is not the only cause of delays — but our hotter climate doesn't seem to be helping.
Internet: Engoo
Why Climate Change Could Mean More Delayed Flights
No one enjoys a delayed flight, but as our weather gets warmer, we can expect more of them.
That's according to experts, who say that the heat of the summer might cause more delays.
Bloomberg looked at US data for flight delays at airports in Chicago and New York from June to August in 2022 and from January to March in 2023. It found that there were more delayed flights in the summer months at both airports.
When the temperature rises above 39 degrees Celsius, things get very difficult for airlines, Bijan Vasigh, a professor at Embry-Riddle Aeronautical University in the US, told Bloomberg.
The air is thinner when it gets hot and that makes it harder for planes to take off. In thinner air there is not as much lift, so more power is needed.
When they need more power, it helps to have a lighter airplane.
That might mean pilots have to make last-minute decisions to reduce the weight on board by dumping fuel, passengers or baggage — meaning the plane will probably be delayed.
The problem gets worse at airports that are at a higher altitude where the air is already thinner, and at airports with short runways, since planes need more space to get up to a high speed.
But thin air is not the only problem. Smoke from wildfires — that have been happening all around the world in the summer of 2023 — can also cause flights to be delayed and canceled.
Of course, the summer is also a busy time when millions of people fly, and weather is not the only cause of delays — but our hotter climate doesn't seem to be helping.
Internet: Engoo
Why Climate Change Could Mean More Delayed Flights
No one enjoys a delayed flight, but as our weather gets warmer, we can expect more of them.
That's according to experts, who say that the heat of the summer might cause more delays.
Bloomberg looked at US data for flight delays at airports in Chicago and New York from June to August in 2022 and from January to March in 2023. It found that there were more delayed flights in the summer months at both airports.
When the temperature rises above 39 degrees Celsius, things get very difficult for airlines, Bijan Vasigh, a professor at Embry-Riddle Aeronautical University in the US, told Bloomberg.
The air is thinner when it gets hot and that makes it harder for planes to take off. In thinner air there is not as much lift, so more power is needed.
When they need more power, it helps to have a lighter airplane.
That might mean pilots have to make last-minute decisions to reduce the weight on board by dumping fuel, passengers or baggage — meaning the plane will probably be delayed.
The problem gets worse at airports that are at a higher altitude where the air is already thinner, and at airports with short runways, since planes need more space to get up to a high speed.
But thin air is not the only problem. Smoke from wildfires — that have been happening all around the world in the summer of 2023 — can also cause flights to be delayed and canceled.
Of course, the summer is also a busy time when millions of people fly, and weather is not the only cause of delays — but our hotter climate doesn't seem to be helping.
Internet: Engoo
Why Climate Change Could Mean More Delayed Flights
No one enjoys a delayed flight, but as our weather gets warmer, we can expect more of them.
That's according to experts, who say that the heat of the summer might cause more delays.
Bloomberg looked at US data for flight delays at airports in Chicago and New York from June to August in 2022 and from January to March in 2023. It found that there were more delayed flights in the summer months at both airports.
When the temperature rises above 39 degrees Celsius, things get very difficult for airlines, Bijan Vasigh, a professor at Embry-Riddle Aeronautical University in the US, told Bloomberg.
The air is thinner when it gets hot and that makes it harder for planes to take off. In thinner air there is not as much lift, so more power is needed.
When they need more power, it helps to have a lighter airplane.
That might mean pilots have to make last-minute decisions to reduce the weight on board by dumping fuel, passengers or baggage — meaning the plane will probably be delayed.
The problem gets worse at airports that are at a higher altitude where the air is already thinner, and at airports with short runways, since planes need more space to get up to a high speed.
But thin air is not the only problem. Smoke from wildfires — that have been happening all around the world in the summer of 2023 — can also cause flights to be delayed and canceled.
Of course, the summer is also a busy time when millions of people fly, and weather is not the only cause of delays — but our hotter climate doesn't seem to be helping.
Internet: Engoo
Why Climate Change Could Mean More Delayed Flights
No one enjoys a delayed flight, but as our weather gets warmer, we can expect more of them.
That's according to experts, who say that the heat of the summer might cause more delays.
Bloomberg looked at US data for flight delays at airports in Chicago and New York from June to August in 2022 and from January to March in 2023. It found that there were more delayed flights in the summer months at both airports.
When the temperature rises above 39 degrees Celsius, things get very difficult for airlines, Bijan Vasigh, a professor at Embry-Riddle Aeronautical University in the US, told Bloomberg.
The air is thinner when it gets hot and that makes it harder for planes to take off. In thinner air there is not as much lift, so more power is needed.
When they need more power, it helps to have a lighter airplane.
That might mean pilots have to make last-minute decisions to reduce the weight on board by dumping fuel, passengers or baggage — meaning the plane will probably be delayed.
The problem gets worse at airports that are at a higher altitude where the air is already thinner, and at airports with short runways, since planes need more space to get up to a high speed.
But thin air is not the only problem. Smoke from wildfires — that have been happening all around the world in the summer of 2023 — can also cause flights to be delayed and canceled.
Of course, the summer is also a busy time when millions of people fly, and weather is not the only cause of delays — but our hotter climate doesn't seem to be helping.
Internet: Engoo
Internet: BBC News
Internet: BBC News
Internet: BBC News
Internet: BBC News
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