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  1. #1
    Join Date
    May 2011
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    Murray Bridge S Aust.
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    Default Drill Doctor repairs

    Wondering if anyone has had to get a Drill Doctor repaired. My DD750 let out a puff of smoke and tripped the CB, pretty sure the motor has had the cactus, no smell or anything like that.
    Don't really feel like shelling out another $600 for a new one, and my eyes aren't what they used to be for sharpening drills.
    Thanks,
    Kryn
    To grow old is mandatory, growing up is optional.

  2. #2
    Join Date
    Dec 2005
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    South Australia
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    Default

    If I need power tools repaired and can't don't want to do myself, I take them to Russell, Prestige Power Tool Repairs on Marion rd Mitchell Pk.
    if he can't fix it then it either can't be fixed or it is not economical to repair, don't be put off by his shop looks like a junk shop, this guy knows more about power tools than the companies
    that make them ( I have been using him for 30 odd years )

  3. #3
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
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    6,439

    Default

    Quote Originally Posted by KBs PensNmore View Post
    Wondering if anyone has had to get a Drill Doctor repaired. My DD750 let out a puff of smoke and tripped the CB, pretty sure the motor has had the cactus, no smell or anything like that.
    Don't really feel like shelling out another $600 for a new one, and my eyes aren't what they used to be for sharpening drills.
    Thanks,
    Kryn
    Hi Kryn,

    It might be worthwhile checking for grinding debris round the commutator !
    Best Regards:
    Baron J.

  4. #4
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    Jun 2010
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    Canberra
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    Default

    When I first got my DD, the moment I first turned it on there was a hell of a bang and a puff of smoke. I believe it uses a rectifier and a DC motor, the former thing is what went off like a gunshot. To this day I always flinch a bit when turning it on.

    So it may just be a failed rectifier bridge, which would be a pretty simple fix.

  5. #5
    Join Date
    Feb 2013
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    Laidley, SE Qld
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    Default

    Nothing to do with repairs, but I've always thought that whoever makes the DD 750 is very short sighted when it comes to pricing the 240V version. Seeing that 90% of the world runs on 240V 50Hz (220/230 for the pedants) they are ignoring or pricing themselves out of 90% of the world market.
    The 110V 60Hz version can be found on Amazon USA for US$150, (AU$200), there can be no reason why a 240V 50Hz version can't be made and sold for the same price, but the maker and/or their distributors keep demanding extortionate prices (I paid $450 for a DD750 12 years ago) and they wonder why they aren't selling many. There is no warranty on a 110V version if it is used in a 240V country, it matters not if you have a good 110V 60Hz power supply for it.
    For what they are they shouldn't be anymore expensive than any other small power tool or kitchen appliance i.e. sub AU$100.

  6. #6
    Join Date
    Jan 2004
    Location
    Mackay North Qld
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    Default

    Hi Kyrn
    I had a look through Google for diy DD repair and found this on the Renovate forum

    https://www.renovateforum.com/f216/d...r-750x-125419/

    Just maybe, there is something contained therein which may be of help.

    Grahame

  7. #7
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    Default

    Thanks Grahame, very good information. Don't know why it didn't come up when I tried to search for information on repairing it.
    Kryn
    To grow old is mandatory, growing up is optional.

  8. #8
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    Dec 2011
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    Sydney
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    I have heard of Drill Doctors but never seen one, so I am interested to hear from someone with user experience:
    Does a Drill Doctor (500 or 750) actually do a decent job of sharpening drill bits?
    What about doing split points?
    Bill

  9. #9
    Join Date
    Oct 2007
    Location
    Alexandra Vic
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    654

    Default

    Quote Originally Posted by WCD View Post
    I have heard of Drill Doctors but never seen one, so I am interested to hear from someone with user experienceoes a Drill Doctor (500 or 750) actually do a decent job of sharpening drill bits?What about doing split points?Bill
    I have a 110V DD750 which I run through a 1000VA toroidal stepdown transformer (twin 55V output windings in series, made for a HD audio amp). It does a good job of regrinding drills within it's size range (to 3/4", 19mm with the large bit collet), and can sharpen at various angles including 118 and 135 deg. You can sharpen at 135 and then remove a plug in the side and insert collet and bit through the hole exposed and split the point. From memory, the DD500 has similar capacity but a fixed 118 deg grind, and may not have a split point facility, as the 750 instructions only mention splitting for the 135 deg grind. Understanding the bit setup process in the collet and following it exactly is important, but you can learn that quickly by doing partial grinds, stopping and checking what is happening and resetting as required, took me about 3 tries to get the positioning exact and to the right depth, since then I have had no issues, but would expect that depth might need to be reset when changing from 118 to 135 grinds or vice versa. Depth adjustment is a simple turn a wheel situation with marked graduations.Hope that helps
    I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.

  10. #10
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    Don't quote me on this, but I thought the DD500 only goes up to 1/2", .500" or 13mm while the DD750 does 3/4", .750" or 19mm, and both will do the split points.
    And YES they do a good job on them, if it didn't, I wouldn't be bothered fixing mine.
    Kryn
    To grow old is mandatory, growing up is optional.

  11. #11
    Join Date
    Oct 2007
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    Default

    My memory was out of whack again Kryn, I put it down to not looking at the data for the 500 for several years, and having just finished a month of cancer treatment this week. Googled the 500 and it does do 118 and 135 deg points, and does split point as well. Both the 500 and 750 ship with a 1/2" collet, but will accept the optional 3/4" collet to handle drills to 3/4"/19mm.

    I could open up my 110V unit to trace out the circuit but doubt that that will solve the issue of what went bang in your 240V unit. Might be useful for comparison if someone with a working 240V unit was also able to do the same, and we both made our info available.
    I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.

  12. #12
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    Dec 2011
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    Sydney
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    Default

    Malb and Kryn
    Thanks for your advice. Sounds like a DD is fit for purpose, and I will put it on the list.
    Given the silly asking prices for a 240V Drill Doctor, I will get a 110V version and use a transformer.
    Bill

  13. #13
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    Default

    Going by some of the comments in other DD threads, there seem to be a few sitting/hiding in/under places.
    Post a thread in the wanted section, you may pick up a bargain.
    Kryn
    To grow old is mandatory, growing up is optional.

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