제 7 장 - Spiral bits 가장 많이 쓰이는 엔드밀
WOODWORKING 에서 가장 많이 쓰이는 SPIRAL BITS 에 대해 알아 봅시다.
Spiral bit 는 3가지 종류가 있습니다.
-UP-CUT
-DOWN-CUT ( 역날이라고 칭함)
-COMPRESSION-CUT ( 많이 사용하지 않음)
가장 많이 사용되는 "DOWN-CUT"과 "UP-CUT"에 대해 좀 더 알아 봅시다.
COMPRESSION CUT
UP-CUT 과 DOWN-CUT 의 혼합형 입니다. 톱밥을 양 옆으로(SIDES) 밀어내어 가공물 상단과 하단이 깨끗한 커팅으로 마무리 됨. 아래 그림 참조하시면 이해가 빠름.
엔드밀의 종류에 따라 사용 용도가 다르니, 다음 CHAPTER에서 사용 용도에 대해 알아 보겠습니다.
Upcut or Downcut, which bit style should you choose? Upcut bits pull chips up and out of the kerf for faster cutting. This type of bit is ideal for high-volume shops but the workpiece must be securely clamped in place to prevent lifting. For work requiring a finer finish consider a downcut spiral bit.
Downcut bits don't clear chips as quickly as upcut bits but their downcut geometry pushes wood fibers down into the cut and leave a nicer quality top surface on your workpiece. They do require a slower feed rate. When used in a router table downcut bits actually push your material up.
Please note: The recommended depth of cut for any single pass is 1/2" of the diameter of the tool. For example, if you are using a 1/4" diameter cutter you should only take a 1/8" depth of cut for any single pass. When used in a router table upcut bits actually pull your material down.
Imagine combining an upcut and a downcut and you’ve got a Compression Cutter. The flutes literally go one way for the bottom half of the flute length and the other way at the top. Compression cutters are for plywood, composites, and laminates. They’re used because the pull towards the middle of the cutter, which reduces chipping on both the top and bottom. Use one to cut completely through a sheet of plywood and you’ll have cleaner edges on both sides.
Given the chip clearing problems, and the desired use to prevent chipping, G-Wizard has a special setting for compression cutters. When using our G-Wizard Feeds and Speeds software, select an Endmill type and then click the “Geometry” button. There is a choice there for compression cutters that will adjust feeds and speeds accordingly.
Don’t try to use a Compression Cutter on metal!
WOODWORKING 에서 가장 많이 쓰이는 SPIRAL BITS 에 대해 알아 봅시다.
-UP-CUT
-DOWN-CUT ( 역날이라고 칭함)
-COMPRESSION-CUT ( 많이 사용하지 않음)
가장 많이 사용되는 "DOWN-CUT"과 "UP-CUT"에 대해 좀 더 알아 봅시다.
COMPRESSION CUT
UP-CUT 과 DOWN-CUT 의 혼합형 입니다. 톱밥을 양 옆으로(SIDES) 밀어내어 가공물 상단과 하단이 깨끗한 커팅으로 마무리 됨. 아래 그림 참조하시면 이해가 빠름.
Upcut or Downcut, which bit style should you choose? Upcut bits pull chips up and out of the kerf for faster cutting. This type of bit is ideal for high-volume shops but the workpiece must be securely clamped in place to prevent lifting. For work requiring a finer finish consider a downcut spiral bit.
Downcut bits don't clear chips as quickly as upcut bits but their downcut geometry pushes wood fibers down into the cut and leave a nicer quality top surface on your workpiece. They do require a slower feed rate. When used in a router table downcut bits actually push your material up.
Please note: The recommended depth of cut for any single pass is 1/2" of the diameter of the tool. For example, if you are using a 1/4" diameter cutter you should only take a 1/8" depth of cut for any single pass. When used in a router table upcut bits actually pull your material down.
Imagine combining an upcut and a downcut and you’ve got a Compression Cutter. The flutes literally go one way for the bottom half of the flute length and the other way at the top. Compression cutters are for plywood, composites, and laminates. They’re used because the pull towards the middle of the cutter, which reduces chipping on both the top and bottom. Use one to cut completely through a sheet of plywood and you’ll have cleaner edges on both sides.
Given the chip clearing problems, and the desired use to prevent chipping, G-Wizard has a special setting for compression cutters. When using our G-Wizard Feeds and Speeds software, select an Endmill type and then click the “Geometry” button. There is a choice there for compression cutters that will adjust feeds and speeds accordingly.
Don’t try to use a Compression Cutter on metal!
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