Drill Doctor - I figured it out !!!

Yay!Gurrr

Yay!Gurrr

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Mar 17, 2005
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Drill Doctor -

Well I finally figured out my drill doctor. Guess I'm stupid cause I read the book 10 times and watch the movie 3 times and still just didn't get my bits to look right...

I have the 570x which has several adjustments. The book glosses over any technical details of the adjustments only making overly simplified statements. And of course no pics or references...

So after some fiddling I figure out what I was doing wrong..

The bit angle (usually 118 or 135) has NOTHING to do with the chisel angle.

The tool has had 118 referenced on the chisel angle w/ + and - incriments from there. No mention of how it related to the cut angle if it did or not) I now realize it doesn't.

Finally through methodical testing I determined what I later confirmed online in reading. I found a good machinist article which covered some bit details and stuff.

"Generally, point angles for split-points are 118° or 135°. The
focus here will be on the latter, because it is used most widely
When grinding the 135° split-point surface, the chisel-edge angle
(Figure 9A) should measure 105° to 120°."
[ Referenced from here: http://www.precisiontwistdrill.com/techhelp/pdf/HSS_reconditioning_189-190.pdf ]


Ahhhhhhhhhh I now I get it... I found that if I set the chisel point (the index thing on the depth setter part) lower than center starting point of 118 my bit got better... Ie I rotated that clock wise down 3-4 notches for most of my HSS bits. I'm not sure if its better or not, but at this point I simply wanted my bits to look like they did when I started only sharper.. I'll work on understanding the pros/cons of the different angles down the road...

Now I get it...

Figured I'd share cause I know there are at least 2 others out there having the same problem I did :) I won't name names.. :fuck-you:
 
Yea I don't think my dad got it either. He hates his drill dr.
 
I've been wanting to get one of these but I wasn't sure if they were worth it or not. Now that the adjustments are right are you happy with it?
 
Yes I'm happy with it. After i figured that part out I'm beginning to understand more about bits in general. Some of the cheaper bits have a 135deg head angle but a more sharper chisel angle. (makes em cut in faster) so now I'm able to 'see' the difference in them vs other bits.

After I got that stuff sorted out I touched up some of my larger bits. 9/16, 1/2 etc.. Being able to clean them up will more than pay for the tool... It's not a super high quality tool but I think with some understanding of what your soposed to be accomplishing you can make it do what you need to..
 
That's what I was looking to find out. I think I'm going to pick one up and put my large drawer of old bits back into service.
 
I hope it works out with the adjustments... the specs on it looked good.
 
marvilusone said:
I think I'm going to pick one up and put my large drawer of old bits back into service.
Click to expand...

Better hire an "illegal" to do the work :) I had the same idea but never got around to it, I just sharpen as I go as I need to.

I have had mine a few years and it's been kinda hit and miss as to whether it sharpens like I want or not. Sometimes it does, sometimes it doesn't. I'll read Mike's links and see if the info helps :)
 
JC said:
Better hire an "illegal" to do the work :) I had the same idea but never got around to it, I just sharpen as I go as I need to.
I have had mine a few years and it's been kinda hit and miss as to whether it sharpens like I want or not. Sometimes it does, sometimes it doesn't. I'll read Mike's links and see if the info helps :)
Click to expand...
I didn't mean all at once! I'll just do as you did and sharpen as needed. I do however have a friend who is borrowing driveway/shop space to do his drivetrain rebuild and axle swap for no charge so I might have to put him to work.
 
My daddy and father in law have one. My father in law showed me the old school way of using a bench grinder.
 
hahhaah John hates my drill dr cause he could never get it to work..

I like it.. it works (if I pay attention to the settings)

if you follow the directions, etc it actually works :)
 
It really took me alot of trial and error but I finally figured it out and now it's a lifesaver. I had about 200 bits to sharpen so I did about 10-20 every other day till I was done so it took awhile. If you get them all done be sure and make a special place for the bits you dull cause if you throw them in the sharp pile that will be the one you chuck up everytime and that's agrivating.
 
marvilusone said:
I didn't mean all at once! I'll just do as you did and sharpen as needed. I do however have a friend who is borrowing driveway/shop space to do his drivetrain rebuild and axle swap for no charge so I might have to put him to work.
Click to expand...


i dont know if thats the best idea....dad had one and i couldnt figure it out, but then agian it was one of the chicago electric ones.....hell i guess i at least owe that to you bc my rig is taking up alot of space
 
marvilusone said:
I didn't mean all at once! I do however have a friend who is borrowing driveway/shop space to do his drivetrain rebuild and axle swap for no charge so I might have to put him to work.
Click to expand...

That's an idea! I always planned to have one of the guys I was helping out do some while I'm working on their rig but that plan never seems to work out :(
 
love mine, just try and separate the different brands so I dont mix up the angles. that sucks. I do them in the winter when its cold and nasty outside or when relatives that I dont care too much for are about (cough, cough, Democrats, cough).
 
yager, whats up Bitsh arpener....:flipoff2:
 
Ive used a bench grinder for years...bought a dd and it works fine I suppose, just slower than the bench grinder...

Its one of those things you get a feel for and once you get the feel for how you want your bits then its easy to repeat.
 
Watch the viedo it explains it all.
 
I've got a Drill Dr too. I don't remember the model, but I have had it about 5-7 years I think. It works great! I love the thing. I bought a good set of Dewalt drill bits years ago, and have resharpened them numerous times. It does require a bit of technique to get them right though.
 
I freehand sharpen mine on a belt sander, and they always cut better than dull. My dad showed me how years ago, and a couple hundred bits later I can get it right almost every time.
 
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