Written on April 10, 2011 at 1:15 am by Power Tool Team

Percussion Masonry Drill

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Percussion Masonry Drill
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Drill Doctor DD750X Drill Bit Sharpener best price

Drill Doctor DD750X Drill Bit Sharpener

Wow, a drill bit sharpener that actually does as the manufacturer claims. To me, few things are more aggravating than trying to work with a dull drill bit, especially when working with steel. When considering the amount of time wasted and productivity lost whenever good sharp bits are needed on a job, but unavailable, it doesn't take long to realize that it only makes good economic sense to be able to sharpen your own bits, especially for contractors and service/maintenance shops. Personally, I don't mind spending a few minutes of my time, sharpening my drill bits, which I use on my jobs.
Like others, I had tried some of the useless, piece of junk sharpeners that came along in previous years and was a little apprehensive about trying yet another one. I'm glad I decided to try the 750SP. It really does have the ability to get your twist drill bits razor sharp, usually in less than one minute. You can also use it to convert standard point bits to split point bits. I thought it was going to be a pain to use, but the sharpening technique is simple and very easy to master. Alignment of bits over 1/8" is done with the chuck by inserting it with the bit into the alignment slot. With bits smaller than 1/8", you have to insert the bits into the alignment slot without the chuck initially and then slide the chuck over the bit after. This may sound a little cumbersome, but once you have the unit and do it one time, you'll see that is actually not an issue at all, even with bits as small as 3/32".
Watch the included video a couple of times, which is only about sixteen minutes in length, then read through the instruction manual and it will all come together.
The first bits I sharpened were 3/16" x 4", ¼" x 4" and ½" x 6" Relton percussion masonry bits. Now they are sharper than when new.
After sharpening, the tips of carbide masonry bits seem to have a more angular look than the original tip, but they work excellent. Refurbishing these first few bits saved about eleven dollars in replacement costs minus about six minutes of my time from start to finish.
I then continued on, sharpening my Hanson 29 pc. HSS set, a couple of Vermont American 13 pc. HSS sets and a box of various sized loose HSS bits. Most bits took well under one minute to complete, and I wasn't even hurrying. Almost all came out right on the first try. Any mishaps where easily fixed by simply repeating the procedure over again.
As for savings, the 29 pc. set cost eighty dollars new, the 13 pc. sets were fifteen dollars each and there where at least thirty dollars worth of loose bits in the box. That's about one hundred forty dollars of bits refurbished, minus around thirty minutes of my time. Keep in mind that this is only the first sharpening. It's safe to say that most bits in reasonably good shape can probably be sharpened at least eight to ten times.
One of the biggest and probably the most overlooked advantages of the 750SP is that it can also sharpen up to ¾" SDS type masonry bits. I used it to sharpen a small Bosch 5/32" x 4" [2"usable length], ¼" x 6" and ½" x 6" SDS bits. They are now good as new. I could never get them this sharp with just a file. This is about seventeen dollars worth of refurbished SDS bits and the sharpening process consumed all of about four minutes of my time. When you start getting into quality SDS bits sized ½" x 10" to ¾" x 10", then your beginning to look at real savings, with replacement costs at around sixteen to twenty two dollars per bit.
My 5/16" x 18" and 3/8" x 18" bell hanger bits required two hands to steady and guide them while sharpening, but they all came out great and haven't been this sharp since the day I bought them. As you can see, it just goes on and on.
The 750SP's comes with a carry case and the motor only draws 1.75Amps at 120V, so if you have an inverter in your truck, you can take it with you to the job and never have to worry about having anything less than the sharpest bit available. Supposedly you can get about two hundred sharpenings from one grinding wheel. Replacements grinding wheels cost twenty dollars and come in 100 grit or the standard 180 grit.
I have absolutely no problem at all recommending the 750SP. It works extremely well and requires a minimal learning curve. If you are concerned about return on investment, I think you will easily see the 750SP and any replacement grinding wheels pay for themselves in short order by refurbishing your more expensive SDS masonry bits and quality HSS or cobalt twist drill bits. Additionally, having sharp drill bits readily available can go a long way toward helping reduce job productivity losses.

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