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Thread: Christmas bit

  1. #1
    Join Date
    Feb 2003
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    Albuquerque, NM
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    Christmas bit

    My daughter gave me a WoodWorkers Supply gift certificate for Christmas so I stopped in today and picked up a Freud 77-308 1/2" 3 flute compression bit for my CNC router. I never would've spent my own money on it.

    It's a wicked looking bugger.
    Attached Images Attached Images

  2. #2
    Nice purchase. Ive got a couple 3/8" and a couple 1/2" Amana's. Impressive tools (compressions). Sucks bad on the checkbook when they snap.
    Sometimes I just want to look at pretty pictures,... Thats when I go to the Turners Forum

  3. #3
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    I can understand the checkbook pain. They don't give these away cheap!
    I love the 1/4" compression bits I have. I'm hoping this one will be a little quieter.

  4. #4
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    Feb 2003
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    Hayes, Virginia
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    I agree, It's a wicked looking bugger alright.
    I hope it works good for you in your router.

  5. #5
    Join Date
    Oct 2007
    Location
    Jonesborough, TN
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    54
    I've never heard of a compression bit. What is it used for?

    Chuck

  6. #6
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    Chuck, the compression bit is used (mostly) in cnc routers. The lower part of the cutter has a "up" spiral grind and the upper part has a "down" grind. That helps prevent chipping of the top & bottom edge of the work piece and allows for a more aggressive feed rate.

  7. #7
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    Oct 2007
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    Jonesborough, TN
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    Thanks for the explanation, Bruce.

    Chuck

  8. #8
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    Oct 2006
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    Bloomington, IL
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    I use 1/4 bits due to though hole requirements. In 3/4 ply with a 1/4 dia compression bit, what pass depths do you use??

  9. #9
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    Quote Originally Posted by Mike Heidrick View Post
    I use 1/4 bits due to though hole requirements. In 3/4 ply with a 1/4 dia compression bit, what pass depths do you use??
    Mike, with this new bit probably .5 depth, 250ipm. I'll have to experiment with it.
    I'm a hobbyist so time and maximum efficiency are not that important to me.

  10. #10
    We've only 2 flute compressions so far and running 1/2" 2 flute 600ipm @18K on Melamine single pass. Looking at the 3 flute we could back RPM WAY down. I know your not shooting for max performance but what RPM will you run at 250imp? The bits are so expensive youd hate to just grind one down to nothing running it too slow?
    Sometimes I just want to look at pretty pictures,... Thats when I go to the Turners Forum

  11. #11
    Join Date
    Feb 2003
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    Mark, I haven't had a chance to play with it yet. I've been down with a bad cold for the last week.

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