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Thread: Drill Doctor repairs
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23rd Nov 2020, 11:44 PM #1Most Valued Member
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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,
KrynTo grow old is mandatory, growing up is optional.
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24th Nov 2020, 12:01 AM #2China
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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 )
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24th Nov 2020, 12:54 AM #3
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24th Nov 2020, 10:10 AM #4Diamond Member
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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.
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27th Nov 2020, 10:54 AM #5Diamond Member
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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.
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27th Nov 2020, 09:33 PM #6
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
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27th Nov 2020, 10:07 PM #7Most Valued Member
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Thanks Grahame, very good information. Don't know why it didn't come up when I tried to search for information on repairing it.
KrynTo grow old is mandatory, growing up is optional.
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27th Nov 2020, 11:16 PM #8Golden Member
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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
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27th Nov 2020, 11:39 PM #9
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.
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28th Nov 2020, 02:59 PM #10Most Valued Member
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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.
KrynTo grow old is mandatory, growing up is optional.
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28th Nov 2020, 05:40 PM #11
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.
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28th Nov 2020, 05:53 PM #12Golden Member
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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
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29th Nov 2020, 03:20 PM #13Most Valued Member
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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.
KrynTo grow old is mandatory, growing up is optional.
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