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Click on image for the lowdown. 
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| | | Forums66 Topics128,018 Posts1,055,342 Members48,419 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | I think that the difference between the Drill Doctor and the less expensive ones is in the sophistication of the machine. The Drill Doctor has an offset cam arrangement that duplicates the taper of the two faces so that only the cutting edges are contacting the material directly. This cannot be achieved by simply rotating the drill in a fixed position against a grinding wheel. | | |
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