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Drill Doctor DD750X

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Drill Doctor DD750X

Postby KE4AVB » Tue Jul 18, 2017 7:03 pm

Anyone got any experience with the Drill Doctor DD750X? I considering buying one. I getting tired of throwing away good drill bits just they are getting dull or chipped. At $6 a piece they do get expensive after a dozen or so replacements. The bit are very good but do eventually get dull after an year's use in the shop.
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Re: Drill Doctor DD750X

Postby bgsengine » Tue Jul 18, 2017 7:28 pm

I have one . well worth it but make sure and practice on an old throw-away set first to figure out the "finer points" or doing your drill bits - Im not sure if I got the DD750x but the one I got can do split points.

Took me several attempts on a few different sizes to really get it right (and I'd suggest if you dont use it every few days, keep your "old throwaways" to get back in practice next time.)
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Re: Drill Doctor DD750X

Postby KE4AVB » Tue Jul 18, 2017 8:18 pm

Use a Drill Doctor years ago and yes it takes time getting things set right and definitely want to do split points. Don't Remember the model but I know it is no longer available but it would not do the sizes that 750X will do.

I did have problem at first getting the splits right but it was a lot better than doing them by hand on the grinder. A few done on the grinder were UFOs at least I know not stand in front of the grinding wheel. Done seen what those UFO's can do to plywood walls.

That 750X looks to be a much better unit. I can get new one for $131 with free 2 day shipping.

And I got a few junk bits that I got from Lowe's that I can practice on. Definitely don't want to mess up my Fastenal bits.
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Re: Drill Doctor DD750X

Postby OverKnight » Wed Jul 19, 2017 10:28 pm

I'm not sure which model I have; I bought it maybe 10 years ago. Someone like my father (who had amazing skill) could grind a better point than the Drill Doctor, but for the rest of us I think it works quite well. The key to getting a good point is to ensure the bit is correctly aligned in the bit holder. There's a flat on the top of the bit holder, and the groove between the flutes must be 90 degrees to the flat, i.e., the flutes are at 6 and 12 o'clock and the grooves are at 3 and 9 o'clock. This is easy to set with a larger bit, especially using the alignment device on the Drill Doctor, but you need to take a little extra care with smaller bit. It only takes a few turns to freshen up a slightly dull bit, but for very dull bits, you will need to re-set the bit in the holder and repeat the sharpening process.
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Re: Drill Doctor DD750X

Postby KE4AVB » Thu Jul 27, 2017 5:48 pm

Well I got in the DD750X and seems to work fine except the finish grind could be a little smoother but will work out. Sharpen about 15 of my bits already.

I also got a real test on the 365nM handheld UV I brought. Funny everything the UV dye supplier tried selling were unusable in bright lights. The one I settled on works fine though direct sunshine is still problem but at least I don't need to be under a dark tarp to find oil leaks. I have learned to use the UV dye to take guess work of finding leaks.
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Re: Drill Doctor DD750X

Postby Arkie » Thu Jan 25, 2018 9:06 am

Just noticed this thread.
I've been using a 750X drill doctor (one that will do up to 3/4 inch bits for couple years.
You need to practice on some bits that are medium sized first, about 1/4 to 3/8 inch in size and have a drill and piece of flat steel plate and see how the bit actually drills immediately after you have first sharpened to make sure it drills the steel plate good.
Have a new good same size bit at the ready so as you can compare the drilling or to look at and compare the grind.
I use a permanent marks a lot pen to color the end of a bit as I'm grinding to see the progress of the grind in the sharpener.

First time I used mine I sharpened several bits and they visually looked real good but would not drill into hot butter.
Read pg 26-29 off the owners manual especially about the relief angle. I had to use a 10 degree POSITIVE relief setting on my sharpener for good drilling into steel plate.

I also got the coarse stone for the larger bits but if a bit is seriously damaged I just carefully hand grind until I get it close then go to the Drill doctor for finish grinding and use the permanent marks a lot pen to see the progress. This coloring with the marks a lot. allows you to readily confirm the bit is ground all the way across from face to heel.
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Re: Drill Doctor DD750X

Postby RoyM » Thu Jan 25, 2018 10:09 pm

I had to chuckle regarding the UFO's, I have lost a few bits that way and came close to grinding my fingers off.
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