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  1. #101
    Join Date
    Sep 2005
    Location
    Greensboro, North Carolina
    Posts
    2,718

    Default Re: dado fingers question

    Quote Originally Posted by Rader Sidetrack View Post
    The units linked above use air for rotation, but also use air to move the bit laterally.
    Interesting. I didn't know that. That could change everything

    I sent them an inquiry to see what it would cost to set up what I needed. I have a feeling it will be too costly, but only one way to find out.

  2. #102
    Join Date
    Sep 2005
    Location
    Greensboro, North Carolina
    Posts
    2,718

    Default Re: dado fingers question

    AutoDrill got back to me pretty quickly. Their opinion was that the best route was to mount a 5 spindle head to a decent size drill press. Unfortunately, they said the cost is quite high for a home or small business use. It could run about $2000. Considering that a good drill press would run $500-900, that comes to a much higher price tag than I was considering/hoping.

    I'm still thinking it would be better for me to take 5 drill heads and mount it to a steel plate and have it powered by a 5 hp motor attached to a belt.

  3. #103
    Join Date
    Nov 2011
    Location
    Rader, Greene County, Tennessee, USA
    Posts
    5,901

    Default Re: dado fingers question

    Lots of drill presses available on Craigslist. Here's an interesting one near you:
    http://greensboro.craigslist.org/bfs/3494849311.html
    ultracrepidarian >> noting or pertaining to a person who criticizes, judges, or gives advice outside of his expertise

  4. #104
    Join Date
    Sep 2005
    Location
    Greensboro, North Carolina
    Posts
    2,718

    Default Re: dado fingers question

    Lol, my concern wasn't the drill press, it was the $2k to convert it to a 5 spindle head.

  5. #105
    Join Date
    Jul 2006
    Location
    Worcester County, Massachusetts
    Posts
    3,575

    Default Re: dado fingers question

    ....not a bad idea. It might be even easier overall to pick up some cheap (HD or Harbor) drill presses...all the same model (and even a couple of spares for the future), and come up with a mounting system.

    I'd consider something that looks like a "sensitive drill press", where the workpiece/table is moved into stationary drill heads.

    deknow
    The irony is free. It's the sarcasm you are paying for....ironically.
    -Felicity Jones in "Chalet Girl"

  6. #106
    Join Date
    Dec 2010
    Location
    Ojai, California
    Posts
    928

    Default Re: dado fingers question

    Anybody wanting to make a "Quick-and-Dirty" mock-up first could consider a Harbor Freight dado set at about $25 apiece (and use the 20% off coupons ~ $20 each bought 1 at a time). They don't last very long, but cut the soft pine well enough for a few.

    I would not consider them for an actual production machine. If you're gonna compete, get the best carbide you can buy - mount them on tool steel form cutters, build a arbor shaft that will take the load and then some, support the bearings with serious rigidity, and figure the drive system to be appropriate for the power applied. Power the machine so that the motor runs at 50% or lower - burning a little more juice is cheaper than burning motors!

    Building a weak "Q & D" mock-up is not a bad idea at all - it reveals all the problems before you design the real thing. Use it to test on scrap wood - not even good enough for real parts, or at least the worst wood of the run. Try to cut your blanks so that there are no knots near the fingers - better parts and lower load on the machine, not to mention longer cutter life and the staples go in straight after you cut 'em.

    Daniel Y - Another point about wood planks cupping is that plainsawn planks tend to cup much more severely than quartersawn planks. Quartersawn sugarpine makes excellent boxes as it cups, warps and shrinks, very little, and lasts longer than cypress when treated with 50% Linseed oil / 50% Mineral spirits if you dunk them for 3 to 5 minutes, and paint them every year or two (depending on your climate).
    Last edited by kilocharlie; 01-28-2013 at 01:36 PM.

  7. #107
    Join Date
    Dec 2010
    Location
    Ojai, California
    Posts
    928

    Default Re: dado fingers question

    One more trick for you guys drilling the side bars - make the profile, slice it into pieces about 4 or 5 parts thick, drill the holes, then slice them apart. Wah-lah! Holes in 4 or 5 parts instead of a $2,000 multi spindle head.

  8. #108
    Join Date
    Sep 2011
    Location
    Reno, NV
    Posts
    2,920

    Default Re: dado fingers question

    Just make sure you get that piece dead plumb before drilling or every pieces will have holes drilled just slightly more and more off center.
    Stand for what you believe, even if you stand alone.

  9. #109
    Join Date
    Dec 2010
    Location
    Ojai, California
    Posts
    928

    Default Re: dado fingers question

    Quote Originally Posted by Daniel Y View Post
    Just make sure you get that piece dead plumb before drilling or every pieces will have holes drilled just slightly more and more off center.
    Exactly. It would help to make sure they are fairly parallel-sided and the hole line aligns with the wax plane, too. This is how I used to do it, first two at a time, then 3, then 4, then 5...at 6 I had too many off-centers. If you have a planer, you could probably go more than I did and still get good results.

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