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Old 12-11-2015, 01:13 PM   #1
Lester
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Default Sharpening drill bits

I hope mods will let this one fly, a little off topic but then again we do so much fab work on our bikes its really useful product to have around.

In the shop there are two things I hate... dull files and dull drill bits. I have been sharpening by hand for years and have it down pretty good but it is time consuming and good but not 100%.

So I got myself the Drill Doctor 750X for X-mas to help myself out... to my surprise it is quite good and real easy to use and the price is not bad. By the time I have all my dull bits sharpen I will have saved in my investment twice at least. Just wanted to share this with likeminded gearheads.

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https://www.youtube.com/watch?v=Q9YqUdcWuT8

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Old 12-11-2015, 01:31 PM   #2
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Default Re: Sharpening drill bits

I got a drill dr. as well, thinking that it would alleviate this weird drill bit class system that I have (junk bits, good bits and nice bits). I still have the class system, but at least the junk bits stay sharp instead of getting burned trying to hand grind...then replaced

They're certainly worth the time and effort to keep a sharp bit.

Now if I could find a way to resharpen my files (also within a class system).
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Old 12-11-2015, 02:36 PM   #3
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Default Re: Sharpening drill bits

I have a small one and the big one,,,got the big one in the box for $5 at the flea market..love mine..
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Old 12-11-2015, 02:38 PM   #4
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Default Re: Sharpening drill bits

We used to run to the shop across the street and use their sharpener whenever we'd smoke a bit. Before that-given our constant shortage of bits- we would try to sharpen them on the bench grinder, with generally poor results. The sharpener is well worth having, for the time and money it saves if you spend a lot of time on the drill press.
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Old 12-11-2015, 03:56 PM   #5
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Default Re: Sharpening drill bits

i hand sharpen drill bits on belt sanders. The long flat surface is easier to use than the round arc of a bench grinder. If I pay attention and take my time I can sharpen a bit to a degree where it is cutting better than The "factory" point. The problem comes into hand sharpened bits are okay for drilling clearance thru holes because the point can be moved off center to a degree where one side of the chisel is longer than the other leaving a hole that is a greater diameter tha the drill size. Which makes the drill useless in tapping and reaming applications. Ever drill a hole with the proper size bit to be followed up by a reamer and your reamer fall through the hole? The the tip was off center and you were only drilling with one side of your bit.
Is the drill Doctor good enough to sharpen bits to this degree or are they just sharp but not accurate?
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Old 12-11-2015, 04:09 PM   #6
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Default Re: Sharpening drill bits

I seems very accurate and considtent. Fast and easy to use too. Can not be compared to hand dressing.


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Old 12-11-2015, 04:29 PM   #7
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Default Re: Sharpening drill bits

Thanks for this Lester, I've been thinking about investing in one of these for a while but never known anyone who has one to ask what they're like. Other than attachments to bolt onto your off-hand grinder, there doesn't seem to be any competing products, am I right?
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Old 12-11-2015, 04:38 PM   #8
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Default Re: Sharpening drill bits

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Originally Posted by CookieMonster View Post
Thanks for this Lester, I've been thinking about investing in one of these for a while but never known anyone who has one to ask what they're like. Other than attachments to bolt onto your off-hand grinder, there doesn't seem to be any competing products, am I right?
I think thee is a YouTube about that.... I don't like the attachment.... this is easy and fast.

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Old 12-11-2015, 04:56 PM   #9
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Default Re: Sharpening drill bits

After a few decades I can sharpen a bit by hand............only if I have to. A Drill Doctor is far better and less trying on the nerves.
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Old 12-11-2015, 05:03 PM   #10
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Default Re: Sharpening drill bits

read the instructions for sure..making sure the bit is flush on the stone is a must or you will kill your bit..theres a side thing to set the bit before you lock it down..this makes sure your getting correct contact.you can even repair a broke bit
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Old 12-11-2015, 05:19 PM   #11
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Default Re: Sharpening drill bits

I watched the YouTube, pt1 and pt2, took the drill doc out had a go and cranked out three beautifully sharpened bits in under 5 minutes. E-Z

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Old 12-11-2015, 05:46 PM   #12
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Default Re: Sharpening drill bits

I have a Drill Doctor too, very satisfied with it.
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Old 12-11-2015, 08:57 PM   #13
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Default Re: Sharpening drill bits

Good info fellas!
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Old 12-11-2015, 09:19 PM   #14
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Default Re: Sharpening drill bits

I also have one and highly recommend them. One piece of advise though, make sure you don't buy the cheaper one if you're working metal. You need to have the top of the line that does the correct angle and split points needed for drilling metal. The cheap ones only do wood bit geometry, and no split points.
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Old 12-11-2015, 10:31 PM   #15
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Default Re: Sharpening drill bits

Very good information!
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Old 12-12-2015, 12:04 AM   #16
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Default

I've never been able to get a bit do anything after putting it in a drill doctor. The bench grinder always works though.
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Old 12-12-2015, 03:33 AM   #17
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Default Re: Sharpening drill bits

does the drill keep a cutting edge, or once sharpened they dull very quickly?

always thought that HSS dill bits were case hardened and it was the heat as much as overuse that kills them?
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Old 12-12-2015, 04:31 AM   #18
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Default Re: Sharpening drill bits

Quote:
Originally Posted by Samhain View Post
I've never been able to get a bit do anything after putting it in a drill doctor. The bench grinder always works though.
then you are doing something wrong, watch the info video on YouTube and give it another go.


Quote:
Originally Posted by '59 View Post
does the drill keep a cutting edge, or once sharpened they dull very quickly?

always thought that HSS dill bits were case hardened and it was the heat as much as overuse that kills them?
If you burn your drill bit blue boring a hole, the drill doctor will not cure that. You can hack off an inch or so of the toasted drill bit end and give it a new point in the drill doc and your good.
If you are frying your drill bits blue you are using them beyond dull, also slow down on spindle speed and use cutting oil.
Drill bits are supposed to cut a hole not burn one.

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Old 12-12-2015, 04:47 AM   #19
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Default Re: Sharpening drill bits

"Drill bits are supposed to cut a hole not burn one."

thanks Lester, but i'm not really that much of a gorilla ;^)

seasonal greetings from Left Hand Land.
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Old 12-12-2015, 05:02 AM   #20
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Default Re: Sharpening drill bits

Quote:
Originally Posted by '59 View Post
"Drill bits are supposed to cut a hole not burn one."

thanks Lester, but i'm not really that much of a gorilla ;^)

seasonal greetings from Left Hand Land.
ha ha ha... yea I figured that just messing with you, BUT I do see people doing that from time to time. Hope you are coping well with the rains, we've had them too but its gone cold again now.

Cheers

Lester
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