drillbit lengths

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Blog entry by 9FINGERTIM posted 04-04-2013 07:03 AM 1318 reads 0 times favorited 5 comments Add to Favorites Watch

can anyone tell me who it was who decided that smaller diameter drill bits had to get progressively shorter as diameter diminished? why cant my one sixteenth drill bit be just as long as its larger brother? I know I can buy longer bits in all sizes but in the sets you always get the short ones. dont they know that drill bits feel bad enough being small without being short too? I know that longer small drill bits can break easier but I can break the short one just as easily. maybe they think the bits are more appealing in the graduated display?


5 comments so far

View Bogeyguy's profile


548 posts in 2092 days

#1 posted 04-04-2013 09:46 AM

Oh geez. Now youv’e done it. You my friend have upset the apple cart, let the cat out of the bag, spilled the beans, etc. etc. etc.ou are going to creat a rush by woodworkers and nonwoodworkers around the world on all small diameter long drill bits. Why couldn’t you let well enough alone? Why is there always someone who won’t go with the flow and think they must question all that is well and has existed for decades. Why Tim? Is this your mission in life? I happen to like the little guys. Well I better get my butt to lowes and HD.

-- Art, Pittsburgh.

View Chase's profile


448 posts in 3050 days

#2 posted 04-04-2013 11:18 AM

It is about breakage. Though not exactly the same, the column equations are a close approximation to what you do with a small drill bit when pressing on it in a drill.

More or less: Every time you half the diameter, you reduce the strength when pressing down on the bit by 16 times. every time you half the length of the bit, you increase the force it can handle by 4 times. This is assuming the bit is a cylinder, so drill bits will be different, but the general principle will remain.

SO, small bits get very weak. Shortening them helps make up some of that, but not all.


-- Every neighborhood has an eccentric neighbor. I wondered for years "who was ours?" Then I realized it was me.

View longgone's profile


5688 posts in 3332 days

#3 posted 04-04-2013 02:37 PM

it is a national policy decided by Benny L. Bit, the director of tiny holes in Washington DC

View TopamaxSurvivor's profile


18285 posts in 3699 days

#4 posted 04-06-2013 04:15 AM

Actually, that is one of the first things I did after i was born. I guess you can blame me, but I thought it was a the right thing at the time. Sorry for any inconvenience.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View 9FINGERTIM's profile


54 posts in 1964 days

#5 posted 04-06-2013 09:53 AM

You guys are making light of a very real and expensive problem. our beloved us government in its infinite wisdom buys thousands of very expensive drill sets (probably titanium coated platinum} and being the thourough folks that they are they buy the i thousand bit sets. the smaller diameter (from.01ondown are usede for such thing as drilling holes in molecules and doing lobotomies on the brains of polititions} drills haveing shrunk in length along with their diameter have reached the size as to be invisible to the naked eye or even the eye with clothes on. because of this situation the chinese manufacturer of said bits has taking to omitting these invisable drill bits from the setts that they sell the us for $7000.00. this causes the G.A.O. to go crazy trying to find out if our government is being cheated without everyone recieving their share,and very high paid beuroughcrats are even now meeting in committies to discuss this deplorable situation (catered meetings with champaine(SP} and lap dancers) so Im sure you can understand my concerns.



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