Dear Chris:
Thanks a lot for your help on this, your detail infor make me understand clearly.
Thanks & Best Regards!
Stephen Mao (毛名双)
Equipment Engineering
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Office: +86 756 513 8000 ext.68170 (B15 1F)
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”Creating Value that Increases Customer Competitiveness"
发件人: Chris Katzko [mailto:[log in to unmask]]
发送时间: 2009年4月2日 11:51
收件人: Asia Committe Task Group Forum; Stephen Mao
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主题: 答复: [TGAsia] about router bit or milling cutter
Dear Stephen
Various types of cutter design are used depending on the PCB material type and thickness, and trade-offs of accuracy, edge smoothness and cutter life.
Generally:
1. All router tools are solid carbide material, but the material properties depend on application. Generally large grain cheaper carbides are used in applications where a slightly rougher edge finish is tolerable, where very smooth edges or high accuracy are required the carbide is usually a finer grained, more expensive material.
2. Cutter design and cutting speed/feed are very important, the best balance of performance and tool life depends on it. You should consult with the tool supplier who should be able to provide guidelines and tech support to select tools and optimize processes.
3. Generally, "Up-cutting" tools are used for thick parts or thick stacks running at higher in-feed since the chips (dust) is lifted up to the vacuum, prolonging tool life. However, up-cutting tools may not be suitable for very thin or fragile materials and a generally less accurate then down-cutting
4. "Down-cutting" tools such as your photo are generally used for thin & fragile materials, or where edge smoothness or accuracy are critical. Since the chips are forced downward away from the vacuum, speed and feed are more critical for these tools and they may require lower in-feed (longer cycle time) than up-cutting tools. Sine down-cutting tools apply downward force on the materials being cut compressing them against the back-up material, the vibration is generally less and stability better making them more suitable for thin materials of those requiring better finish/accuracy.
5. A reasonable compromise and popular tool style is the "chip-breaker down-cutting" tool. This has a more complex geometry that standard down-cutting, but clear the chip more effectively, generally extending the tools life and possibly increasing in-feed rates. These tools may be more expensive to buy but cheaper to own since the tool life may be longer.
I suggest you consult several tool vendors and comparatively test several tools. Since routers are fundamentally expensive, it is worth the effort to find the most cost-effective solution for your application relative to the requirements.
Hope his helps.
C.B. Katzko 嘉仕高
Research + Development
Meadville Group
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发件人: TGAsia <[log in to unmask]>
2009/04/02 09:50
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[TGAsia] about router bit or milling cutter
Hi, All:
I have a question here needing your help, “what router bit design & material is best for cutting PCB?”
here I put the picture of router bit for your reference, I appreciate your kind help in advance!
cid:[log in to unmask]
Thanks & Best Regards!
Stephen Mao (毛名双)
Equipment Engineering
Email: <mailto:[log in to unmask]> [log in to unmask]
Office: +86 756 513 8000 ext.68170 (B15 1F)
Cell Phone: +86 15992655020
”Creating Value that Increases Customer Competitiveness"
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