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Thread: Drill Press Issues Delta DP220

  1. #1
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    Drill Press Issues Delta DP220

    Hi Guys,

    I've been drilling a lot more larger diameter holes recently (1/2", 5/8", 3/4") in thicker steel (3/8", 1/2", etc). My old Milwaukee/Delta DP220 drill press does great with smaller diameter holes, but the chuck seems to keep falling off when drilling larger holes due to vibrations. I have the plate well secured to the stand with vise grips and I don't make any adjustments as I step up in bit sizes to ensure there are no alignment issues. It's the original chuck and spindle, which I cleaned off with alcohol, but the chuck still continues falls off. After doing some research online, it sounds like I may be pushing the limits of the drill press, but I wanted to ask you guys for your opinion. I bought another drill chuck but haven't had a chance to try it out.

    If I'm not using the right tool for the job, what should I step up to? Do I need a beefier drill press? A mag drill so I can run annular cutters? I don't mind paying a little more $$ for the right tool, but I'm not going to spend $5k for a bridgeport. Or is my drill press setup fine?
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    I need to overthink how I'm going to overkill this project.

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    Re: Drill Press Issues Delta DP220

    I work in aircraft tooling... we use core drills... they look like a twist reamer but they take a bigger bite. I have a little enco drill press (belt drive like yours) and have no problem stepping out to 1 inch... with a much smaller motor.

    I would say speeds and feeds... I will pilot with 3/8ths and step from there. If you ha e access to these it would help... but that's all I can think of.

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  3. #3
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    Re: Drill Press Issues Delta DP220

    So the chuck is coming off the arbor. Have you hammered it onto the arbor? That is unusual in my limited experience.
    I assume the chuck and arbor have the same taper. You should be able to get the arbor out of the machine..
    lower the quill and there should be a slot for a drift to be inserted to knock the arbor out of the quill. Then you can tap the arbor into the chuck. Recess all the teeth, set the chuck on wood and tap the arbor into the chuck.

    If you could slow your machine down you will have better success at drilling larger holes.

    Hole saws or annular cutter or "core drill" are not the way to go until.you have speed reduction.

  4. #4
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    Re: Drill Press Issues Delta DP220

    chuck seems to keep falling off when drilling larger holes due to vibrations
    If you have so much vibration the chuck is coming off the arbor then there is something wrong. Either the bit is wrong, the speed, the chuck, the arbor or maybe the drill. Definitely sounds like something is wrong.

    A video is the only way to show us what is going on.

    good luck

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    Re: Drill Press Issues Delta DP220

    Quote Originally Posted by tapwelder View Post
    You should be able to get the arbor out of the machine..
    lower the quill and there should be a slot for a drift to be inserted to knock the arbor out of the quill. .
    On the older Delta-Rockwell machines there is no slot, the arbor is one piece all the way into the drive pulley and requires 11 steps to remove it
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  6. #6
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    Re: Drill Press Issues Delta DP220

    If chatter is preceding the chuck dropping off, you might be drilling the wrong size pilot hole.

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    Pilot holes should not be greater in diameter than the web of the bit. I call it the dead zone. Dead, because the bit does very little cutting in the web.

    When your pilot hole is too large, the bit will grab. Bits like to be supported by the full length of the cutting edges. Go too big on that hole, and you get bad chatter. If you stall the bit, and try to retract it while the machine is running...…...very often you leave the chuck behind.

    Try a smaller pilot hole, and check your taper to see if it's been damaged. Blue the chuck, and gently rotate it inside the taper. Look up in there with a mirror, or directly if you can get under it, and see if the blue ink is transferring in a band around the inside of the taper, or if the blue is only transferring to one, or a few spots. If the band is interrupted, your taper is either bad, or the chuck is bad. If a known good chuck does the same, it's the taper up in the drill.

    This might also be a good time to learn (if you already don't do it) to sharpen your bits. A well sharpened bit reduces drilling effort big time. Once you get the hang of it, you'll see that a lot of bits off the shelf aren't ground too well.

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    Re: Drill Press Issues Delta DP220

    Site must be back to normal....even the spammers are back
    Last edited by bigb; 04-07-2020 at 11:07 AM.
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    Re: Drill Press Issues Delta DP220

    Quote Originally Posted by mslmachinery View Post
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    Re: Drill Press Issues Delta DP220

    Thanks for the advice guys. I typically drill an 1/8" hole, stepping up to 1/2" then either 5/8" or 3/4". Maybe that's too small of a jump on the upper end? I tried to attach a video but I guess my phone takes too high quality to send. In the photo I drilled an 1/8" hole and then stepped up to 1/2" on a scrap piece of 3/16". The original chuck was falling off during that kind of drilling but the new one stayed on tight, for now. I'm wondering if after years of being beaten up if the chuck taper got a little worn and just wasn't holding as tight?


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    I need to overthink how I'm going to overkill this project.

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    Re: Drill Press Issues Delta DP220

    Don't step drill sizes. Like Samm said above, drill a pilot hole the the same as the thickness of the drill web that you intend to use to finish the hole and use that bit. Every time you step you are work hardening the steel at the edge of the hole.
    And a properly sharpened bit makes all the difference.

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    Re: Drill Press Issues Delta DP220

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    Thanks for the advice guys. I drilled some 1/2 inch holes is 4 sets of 3/16" plate that i tacked together (3/4" total) and there were very little vibrations when I stepped up in sizes since I ensured there was plenty of space between each step. However, the drill motor stalled for the first time and I had to start it spinning by had to finish the job. Am I abusing this drill press or is it just falling apart from all the years of use?
    I need to overthink how I'm going to overkill this project.

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  13. #12
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    Re: Drill Press Issues Delta DP220

    You don't mention anything other than it stalling, were you drilling when it stalled? Is the drill be overly abused by drilling holes double the size of the chuck rating? How old is the rig & did it develop a smoke leak. Do you have to start it by hand every time now? I don't know how many motors I've found & got running because the little starting contactors inside were stuck or dirty.
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    Re: Drill Press Issues Delta DP220

    Quote Originally Posted by CAVEMANN View Post
    How old is the rig & did it develop a smoke leak.
    the pics he posted looks to be a 1950s DP220 so... yea its old the older ones usually had grey paint job, I've got a 93 year old friend that has a 1932 version still using it...

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    Re: Drill Press Issues Delta DP220

    Quote Originally Posted by WeldCrazyDude View Post
    Name:  Drill.JPG
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    Thanks for the advice guys. I drilled some 1/2 inch holes is 4 sets of 3/16" plate that i tacked together (3/4" total) and there were very little vibrations when I stepped up in sizes since I ensured there was plenty of space between each step. However, the drill motor stalled for the first time and I had to start it spinning by had to finish the job. Am I abusing this drill press or is it just falling apart from all the years of use?
    Stalling is a thing of experience. You have to know when to lighten the feed. You get it with time, and experience, on your particular machine. I have had the same issues, and find that lightening the feed, especially at breakthrough, goes a long way in preventing stalling.

    If you sharpen your own bits, you will also be able to detect when they require more down force to continue cutting. You know it's time to head back to the grinder.

    I'm confident you'll figure out the parameters. Manual machining is all about the art of the smoogie

  16. #15
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    Re: Drill Press Issues Delta DP220

    Thanks guys. Yes, the drill press is from the 1950s I believe and has had a rather hard life. This was the first time I had ever experienced the drill stalling and it was right after I pushed through a complete hole. It hadn't happened since, but the chuck not being able to stay on and shortly thereafter the motor stalling has caused me to lose confidence in the rig. It's been great for the couple years I've had it, but I think I'm in the market for another "back up" drill press now. I've been doing some research on here about potentially buying a mag drill as my back up, but I'm learning that you can't really use a mag drill the same way as a drill press. Too bad as it sounded great, drill big holes with annular cutters and small holes with a standard chuck. I guess I'll keep an eye out on craigslist for a deal...
    I need to overthink how I'm going to overkill this project.

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    Re: Drill Press Issues Delta DP220

    Have you considered the press that Lis2323 made for his mag drill. I made one for mine and it does come in handy. You live be able to modify your current press base to accept a mag drill.

  18. #17
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    Re: Drill Press Issues Delta DP220

    I made a holder for annular cutters that I run is drill press

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    Re: Drill Press Issues Delta DP220

    Quote Originally Posted by tapwelder View Post
    Have you considered the press that Lis2323 made for his mag drill. I made one for mine and it does come in handy. You live be able to modify your current press base to accept a mag drill.
    This sounds interesting. Lis2323 has helped me in the past. Happen to have a link/photo etc. for me to check out? He had actually recommended the Hougen HMD 904 to me as a good mag drill.
    I need to overthink how I'm going to overkill this project.

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  20. #19
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    Re: Drill Press Issues Delta DP220

    I've never had the motor actually stall, just the belt slip.
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  22. #20
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    Re: Drill Press Issues Delta DP220

    I replaced a Chinese motor on a jet bandsaw that began to stall. The replacement with the same hp rated motor was 2 times the size the stock motor. TSC marathon motor.

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