Produktif Teknik Permesinan Kelas 11

1.

Prinsip kerja mesin bubut yang benar adalah…

A.

Benda kerja berputar pada sumbunya, pahat bergerak mendatar menyayat benda kerja
B.

Benda kerja berputar pada sumbunya, pahat berputar mendatar menyayat benda kerja
C.

Benda kerja bergerak mendatar, pahat berputar menyayat benda kerja pada sumbunya
D.

Pahat berputar pada sumbunya, benda kerja bergerak mendatar menyayat pahat

Correct Answer
A. Benda kerja berputar pada sumbunya, pahat bergerak mendatar menyayat benda kerja

Explanation
The correct answer is "Benda kerja berputar pada sumbunya, pahat bergerak mendatar menyayat benda kerja." This means that the workpiece rotates on its axis while the cutting tool moves horizontally to cut the workpiece. This is the correct principle of operation for a lathe machine.

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2.

Yang bukan merupakan bagian utama mesin bubut adalah…

A.

Kepala Tetap
B.

Cekam
C.

Meja Kerja
D.

Kepala Lepas

Correct Answer
B. Cekam

Explanation
The correct answer is "Cekam". The other three options, namely "Kepala Tetap", "Meja Kerja", and "Kepala Lepas" are all essential parts of a lathe machine. The "Kepala Tetap" refers to the fixed headstock, which holds the workpiece in place. The "Meja Kerja" is the worktable where the workpiece is mounted and rotated. The "Kepala Lepas" is the removable headstock, which allows for the attachment of different tools and accessories. On the other hand, "Cekam" refers to a chuck, which is a clamping device used to hold the workpiece securely in place during machining. While a chuck is commonly used in lathe machines, it is not considered a primary component of the machine itself.

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3.

Yang bukan merupakan alat potong pada mesin bubut adalah…

A.

Pahat
B.

Countersink
C.

Reamer
D.

EndMill

Correct Answer
D. EndMill

Explanation
An end mill is not a cutting tool used in a lathe machine. It is a type of milling cutter used in milling machines. The other options - pahat (tool bit), countersink, and reamer - are all cutting tools commonly used in lathe machines. However, an end mill is used for milling operations, where the cutting tool rotates against a stationary workpiece to remove material and create a desired shape or profile.

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4.

Gambar di bawah ini merupakan bagian utama pada mesin bubut, yaitu…

A.

Kepala tetap
B.

Kepala lepas
C.

Eretan
D.

Alas

Correct Answer
B. Kepala lepas

Explanation
The correct answer is "kepala lepas." The given image shows a part of a lathe machine, which is the headstock. The headstock is the main component of a lathe machine that holds the workpiece and rotates it. It is responsible for providing power to the workpiece and controlling its speed. The headstock can be detached or removed from the lathe machine for maintenance or to accommodate different attachments or tools. Therefore, the correct answer is "kepala lepas," which translates to "detachable head."

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5.

Gambar di bawah ini merupakan rumus dari....

A.

Putaran Spindel Mesin Bubut
B.

Kecepatan Pemakanan
C.

Kecepatan Potong
D.

Waktu pemotongan

Correct Answer
A. Putaran Spindel Mesin Bubut

Explanation
The given answer suggests that the formula shown in the image is related to the "Putaran Spindel Mesin Bubut" (Spindle Rotation of Lathe Machine). This implies that the image represents a formula or equation that calculates or relates to the spindle rotation of a lathe machine.

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6.

Jenis mesin frais yang memiliki sumbu/spindle tegak lurus terhadap benda kerja adalah…

A.

Mesin Frais Horizontal
B.

Mesin Frais Vertikal
C.

Mesin Frais Universal
D.

Mesin Frais Hexagonal

Correct Answer
B. Mesin Frais Vertikal

Explanation
Vertical milling machines have a spindle that is perpendicular to the workpiece. This means that the cutting tool moves up and down along the Z-axis, allowing for vertical milling operations. Horizontal milling machines, on the other hand, have a spindle that is parallel to the workpiece, enabling horizontal milling operations. Universal milling machines have the ability to perform both vertical and horizontal milling operations. Hexagonal milling machines do not exist, so the correct answer is Vertical Milling Machine.

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7.

Alat bantu mesin frais yang digunakan untuk proses pembuatan alur dan roda gigi adalah…

A.

Meja Putar
B.

Kepala Pembagi
C.

Arbor
D.

Kepala Lepas

Correct Answer
B. Kepala Pembagi

Explanation
Kepala pembagi adalah alat bantu mesin frais yang digunakan untuk proses pembuatan alur dan roda gigi. Alat ini berfungsi untuk membagi putaran benda kerja menjadi beberapa bagian yang sama atau berbeda, sehingga dapat menciptakan alur atau roda gigi dengan presisi yang tinggi. Alat ini sangat penting dalam proses pembuatan alur dan roda gigi karena dapat menghasilkan bentuk dan ukuran yang akurat dan konsisten.

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8.

Gambar di bawah ini merupakan alat bantu mesin frais, yaitu...

A.

Collet
B.

Arbor
C.

Kepala Pembagi
D.

Rotary Table

Correct Answer
B. Arbor

Explanation
The correct answer is "Arbor." An arbor is a tool used in milling machines to hold and rotate cutting tools. It is a cylindrical shaft that is inserted into the spindle of the milling machine and secured with a drawbar. The arbor provides support and stability to the cutting tool, allowing it to rotate and remove material from the workpiece. It is an essential component in milling operations, ensuring precise and accurate cutting.

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9.

Alat bantu mesin frais yang digunakan untuk proses pembuatan alur dan roda gigi adalah…

A.

Arbor
B.

Rotary Table
C.

Collet
D.

Kepala Pembagi

Correct Answer
D. Kepala Pembagi

Explanation
The correct answer is "Kepala Pembagi". Kepala Pembagi is a tool used in milling machines for the process of creating grooves and gears. It is specifically designed to divide the workpiece into equal parts, allowing for precise and accurate machining. This tool is commonly used in industries such as automotive and manufacturing, where the creation of grooves and gears is essential for the production of various components.

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10.

Di bawah ini merupakan alat bantu mesin frais yaitu...

A.

Dividing Head
B.

Arbor
C.

Rotary Table
D.

Collet

Correct Answer
D. Collet

Explanation
A collet is a tool used in milling machines to hold the workpiece securely in place. It is a cylindrical sleeve with a tapered inner surface that matches the taper of the machine's spindle. The collet is tightened around the workpiece, providing a strong grip and ensuring precise machining. This tool is commonly used in milling operations to hold round or cylindrical workpieces, allowing for accurate and efficient cutting.

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