Making a DIY drill

Discussion in 'General Electronics Chat' started by peck68, Nov 26, 2010.

  1. peck68

    Thread Starter Member

    Nov 27, 2009
    73
    0
    Well I don't want to spend £200+ on a special drill for pcbs, and I need something handheld cause I want to start making my own pcbs :D

    I own this DC motor, 12v @ 2.8A, and it's got enough torque I think to do the job - I use it as a fan at the moment and it's brilliant :cool:

    Anyway yeah, is there any way to mount these 1mm drill bits to my 2mm shaft? (http://www.maplin.co.uk/Module.aspx?ModuleNo=37490)

    Or if anyone has attempted this themselves? Thanks
     
  2. tom66

    Senior Member

    May 9, 2009
    2,613
    214
    I don't know what kind of diamond encrusted gold drill you're considering but I have been eyeing this one up for £17.

    You'll still need a 12V power supply, though; you could probably get away with a cheap wall wart as the power supplies are more expensive than the drills!
     
  3. peck68

    Thread Starter Member

    Nov 27, 2009
    73
    0
    Hey that looks awesome thanks kinda what i've been looking for :)

    I already own a 12v 4A transformer so I'm short on power luckily :D I also own one of those insanely huge lead acid 12v batteries

    If I can't find a way to somehow mount the bits to the shaft (safely, at least) then I guess I'll go for the option you said
     
  4. mbohuntr

    Active Member

    Apr 6, 2009
    413
    32
    Got a friend with a lathe?? Make a coupling center drilled with a 1mm hole, and counter bored halfway with a 2mm. Then use set screws. I think you will need to slow the motor down a bit though.
     
  5. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,792
    948
    NO. you want that motor to spin as fast as possible. Much faster than a normal sized drill press would. 5000-10000 is excellent for 1mm. Even faster wouldn't hurt, especially for smaller bits. The centrifugal forces stiffen the drill bit considerably and they don't break as easy.

    This applies to SMALL size bits only. Don't try getting 1/4 inch bits to spin at those speeds.
     
  6. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    You can buy the chucks to attach to the motor.

    http://www.amazon.com/WoodRiver-Drill-Chuck-Mini/dp/B003DQ0BMK
    http://www.amazon.com/Dremel-4486-MultiPro-Keyless-Chuck/dp/B0000302ZV/ref=pd_cp_hi_2 ***

    This is just an example.

    I dont know how it will handle high RPMs, but its $10us giver a try.


    What I use, is a Milescraft Rotary tool press and a Black and Decker RTX (Much better than dremel, and YES, THATS THE TRUTH)

    http://www.amazon.com/Milescraft-10...ref=sr_1_1?ie=UTF8&s=hi&qid=1290807451&sr=8-1

    http://www.amazon.com/Black-Decker-...ref=sr_1_2?ie=UTF8&s=hi&qid=1290807505&sr=1-2

    And the RTX is listed as 3 speed, I dont know why, because it is completely variable. there are just 3 numbers printed on the wheel, but no detents and smooth and stiff variability.

    [ed]
    *** The second link for the drill chuck will handle speeds up to 30,000RPM if mounted properly. I cant find info about the first. The set screw may or may not set the weight off balance at those speeds.
    [/ed]
     
    Last edited: Nov 26, 2010
  7. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,792
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    [​IMG]

    You will probably be finding them in metric.

    There are two ways to get a thread on the motor. Use one of these

    [​IMG] and get someone to put a 2mm hole in it so you can press it on the motor shaft. The hole will HAVE to be centered, so a lathe would be called for.

    The other way is to find what is called an 'arbor mount'. They come in many forms, but you want one like this.
    [​IMG]

    It will require that you have a 'bushing' made to adapt the female set screw mount to the smaller motor shaft. (A brass plug would be fitted into the arbor mount and it would be drilled out to 2 mm.)

    I can't think of many other ways to mount a good quality drill chuck to such a small shafted motor and not use a lathe or some such machine to get a smaller CENTERED hole. Perhaps a search through some premade brass or bronze bushing suppliers stock would reveal a ready made match of size.

    Could you post a pic of it when you get it finished?
     
  8. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,792
    948
    I hit Post to soon. I was going to add more suggestions. You could put the motor on a mounting plate and DRIVE a pulley on another shaft with the drill and chuck mounted on that shaft. More work but no need to adapt anything to the motor shaft and other motors could be used if a replacement or more torque is needed.
     
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