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IndustryArena Forum > WoodWorking > WoodWorking Topics > What is the best way to drill holes?
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  1. #1
    Join Date
    Sep 2010
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    528

    What is the best way to drill holes?

    I'm new to CNC work. I have a background in electronics and have recently built a CNC router out of 8020 extrusions with a PorterCable 690 1 3/4 hp router as a spindle. I have a VFD and can run the router between 8250 rpm and 27500 rpm.

    I work in the marine industry and will be cutting mostly wood, plastic such as StarBoard, some aluminum as well as engraving electrical panels and other engravable materials.

    What is the best way to drill holes in these various materials?

    It seems that using the 1/4" endmill is a great way to drill 1/4" holes, but what about smaller and larger holes?

    Are there special drill bits with a 1/2" or 1/4" shank available?

    Is it reliable to spiral drill holes larger than 1/4"?

    Any ideas are welcome. If this topic has been discussed before feel free to post links, I'm new here and still don't know where all of the good info is.

    Thanks,
    James

  2. #2
    Join Date
    Mar 2003
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    35538
    First, how are you running a 690 with a VFD?

    8250 is still pretty high for drilling. I'm using a Super-PID on a 690 and can drill at 5000 rpm.

    If you need holes larger than 1/4", I'd just route them.

    For smaller holes, Precise bits has 1/8" collets, and different size bits with 1/8" shanks. Precision solid carbide tools for woodworking and metal forming.
    Gerry

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  3. #3
    Join Date
    Sep 2010
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    528
    Quote Originally Posted by ger21 View Post
    First, how are you running a 690 with a VFD?

    8250 is still pretty high for drilling. I'm using a Super-PID on a 690 and can drill at 5000 rpm.

    If you need holes larger than 1/4", I'd just route them.

    For smaller holes, Precise bits has 1/8" collets, and different size bits with 1/8" shanks. Precision solid carbide tools for woodworking and metal forming.
    Correction, I am running the 690 with PWM not VFD.

    I could probably run it as low as 5000, but I need to check the specs on my PWM board.

    I have looked at the drill bits at precise bits and that looks like a good solution, and as you say I can always route holes larger than 1/4".

    I'm still in the learning phase of running my machine so I am always looking to learn from the experience of others.

    Thanks for the help.

  4. #4
    Join Date
    Nov 2008
    Posts
    644
    I would also be interested to hear how you pwm speed control the 690. That unit has an internal module that varies the freq of the line voltage to change speed. Did you replace it somehow?

    I use 1/4" and 1/8" bits to do just about anything. Thats within the limits of the depth of the bit. The CAM package I'm using has the option to cut inside or outside the profile, or completely inside the profile. On a circle it simply plunges into the center and sprials out to the diameter. I found that routing holes is much better then drillig because you only need a bit smaller then the hole and changing size slightly is no problem. Also no chipout and drill bit walking.

    So the answer to your question is software.
    Dean

  5. #5
    Join Date
    Sep 2010
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    528
    Quote Originally Posted by Dean448 View Post
    I would also be interested to hear how you pwm speed control the 690. That unit has an internal module that varies the freq of the line voltage to change speed. Did you replace it somehow?

    I use 1/4" and 1/8" bits to do just about anything. Thats within the limits of the depth of the bit. The CAM package I'm using has the option to cut inside or outside the profile, or completely inside the profile. On a circle it simply plunges into the center and sprials out to the diameter. I found that routing holes is much better then drillig because you only need a bit smaller then the hole and changing size slightly is no problem. Also no chipout and drill bit walking.

    So the answer to your question is software.
    Dean
    Dean,

    Thanks for info. I like your idea of using a 1/8" mill to spiral route holes. I'll experiment with that.

    My 690 doesn't have an internal speed control. It is a single speed unit. I am using a multi function router board that has a VFD built in and uses the PWM from Mach3 to control it (as far as I know). The board is a C33 from CNC4PC.

    James

  6. #6
    Join Date
    Nov 2008
    Posts
    644
    My mistake... for some reason I was thinking about the 890.
    Although I'm not sure I would try to code the sprial out by hand let me know if your interested in seeing the gcode by providing the parameters of the bit & hole size.
    Dean

  7. #7
    Join Date
    Sep 2010
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    528
    Thanks Dean, but I don't have any problems with the programing, I was just wondering what methods were available for drilling holes.

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