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Sandpaper

Selection of Sandpaper Numbers for Wood and Metal Works

Numbers on sandpaper will indicate the size of the sand grain, with the smaller the number meaning the sand grain is large and coarse, suitable for coarse polishing work, and the greater the number means the sand grain is small and fine, suitable for smooth polishing work.

For woodworking, wood polishing should use the "sandpaper number scavenging" technique, starting with a rough number and then gradually switching to a sequentially finer number, so that scratches from previous numbers can be easily removed and work time saved.

Scrub Coarse or Open Crossbow Finish: No more than 60 or 80 numbers should be used to decorate shapes or remove sharp edges.

General Exfoliating Exfoliating: Use Numbers 80-120 to Smoother the Rough Area

Prepare the skin before painting or coating: use numbers 180-220.

For polishing the wood smoother, or using a polish between layers of the coating to make each layer stick well together.

Polished: Use number 240-400

For Metal Works

Rust scrub: Numbers 36-40 should be used.

It may be slightly dipped in water and then scrub the skin or rust stain to the iron texture.

General Exfoliating Exfoliating: Use Numbers 60-120

Prepare Skin Before Painting: Use Numbers 120-220

Polished: Use No. 220-400

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Differences and advantages between water scrubbing sandpaper and dry scrubbing sandpaper

Wet Sandpaper is a sandpaper with a resolution of grains of sand rather than dry, durable, not easy to peel, and is designed to be used while the workpiece is wet.

Advantage: Provides a smooth, non-easily scratched work skin.

Using water together will reduce heat and friction, keep the workpiece intact, and greatly reduce dust problems caused by polishing.

Suitable job: Suitable for steel polishing, to reduce heat and prevent rust.

Includes fine step wood polishing work, or results that require high smoothness.

Dry Sandpaper is a commonly used sandpaper. It is available in many numbers, from coarse to fine. It can be polished on the workpiece without preparing water.

Advantages: Easy to use, convenient, cheap, widely available and quick to polish the workpiece.

Caution: Very distracted dust may occur in the air, and not enough fine numbers can cause scratches on the workpiece.

Proper job: Suitable for wood polishing in the initial step, light polishing work, work requiring fast polishing, or general polishing work.

# Sandpaper # Tool # Hand tools # Machinery

5/25 Edited to

... Read moreจากประสบการณ์การใช้งานกระดาษทรายในงานไม้และโลหะ ผมพบว่าเทคนิค "การไล่เบอร์กระดาษทราย" เป็นกุญแจสำคัญในการได้ผิวงานที่เรียบเนียนสวยงามอย่างมืออาชีพ การเริ่มต้นขัดด้วยเบอร์ทรายหยาบ ช่วยให้สามารถลบรอยใหญ่ได้เร็วและมีประสิทธิภาพ จากนั้นค่อยๆ เปลี่ยนไปใช้เบอร์ละเอียดขึ้นตามลำดับ จะช่วยลดรอยขีดข่วนเดิมให้หมดไปอย่างสมบูรณ์ ผิวไม้หรือโลหะจึงไม่เกิดรอยขรุขระและพร้อมสำหรับการทาสีหรือเคลือบผิวได้ดีขึ้น ผมมักจะใช้กระดาษทรายขัดน้ำในขั้นตอนละเอียด เพราะความสามารถในการลดแรงเสียดทานและความร้อนจากการขัดช่วยปกป้องผิววัสดุไม่ให้เสียหาย นอกจากนี้ การใช้น้ำยังช่วยลดฝุ่นละอองทำให้ทำงานสะอาดขึ้นมาก เหมาะกับงานที่ต้องการความเรียบเนียนสูง เช่น งานไม้ชิ้นเล็กๆ หรืองานที่ต้องขัดเงาโลหะขั้นสูง ในขณะที่กระดาษทรายขัดแห้งก็ยังคงมีประโยชน์มากสำหรับงานขัดหยาบหรือขัดแบบทั่วไปที่ต้องการความรวดเร็วและสะดวกสบาย นอกจากนี้ ยังมีราคาถูกและหาซื้อง่าย ผมมักเลือกใช้ในช่วงแรกเริ่มของงานไม้ เพื่อกำจัดเศษไม้หรือชิ้นส่วนที่ไม่สม่ำเสมอ ก่อนจะเปลี่ยนไปใช้กระดาษทรายขัดน้ำสำหรับงานต่อเนื่อง ส่วนเรื่องการเก็บรักษากระดาษทราย ผมพบว่าใช้ยางลบเช็ดทำความสะอาดผิวกระดาษทรายช่วยยืดอายุการใช้งานได้โดยไม่ทำให้เม็ดทรายหลุดง่าย และยังช่วยลดฝุ่นที่อาจฟุ้งกระจายขณะขัด นอกจากนี้ เทคนิคพิเศษอย่างการ "ลากเส้นดินสอ" บนผิวที่จะขัดช่วยให้รู้จุดที่ต้องจัดการ ลดการขัดซ้ำซ้อน และประหยัดเวลาได้มาก ไม่ว่าจะเป็นงานซ่อมสีรถหรืองานไม้ที่ละเอียดอ่อน เทคนิคเหล่านี้จะช่วยให้คุณบรรลุผลงานที่ดีที่สุดได้ง่ายขึ้น สรุปคือ การทำความเข้าใจเรื่องเบอร์กระดาษทรายและเลือกใช้อย่างเหมาะสมกับวัสดุ และงานที่ต้องการ จะช่วยให้คุณมีผลงานที่สวยงาม เรียบเนียน และยืดอายุชิ้นงานได้นานขึ้นอย่างชัดเจน

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