Oversized Brad Point Drill Holes Solution

Hello Clayton:

It looks like my 1/4" brad point drill bit is cutting a few thousands oversize.  My 1/4" brass arbors are too loose of a fit.  Have you developed a favorite method of tightening up the fit?


Aloha Tim, I have noticed that some of the better Brad point drill bits do cut oversized drill holes.  

I have two sets of drills.  One set of Brad points is from Lee Valley, and is what I use if I am going to put a number of pieces on a rod or tube.  This is because those LV bits cut oversized and the pieces to be glued together will be somewhat tight, but still easy enough to slide over the rod for glue-up.  

The other set of Brad points that I use are the cheap Vermont American "Wobble Point" bits (wobble point is not really their name, but the points do wobble.  Ha).  Those are the correct size for a true press fit.

If the fit is somewhat loose, but is not truly critical that the fit is super tight, I simply spit into the loose hole (okay...sissies can use a drop of water) and then the natural swelling of the wood fibers holds the piece to the rod.  

For something that needs a true press fit tightness, and I mistakenly drilled it with the slightly-oversized Lee Valley bits, I simply use epoxy or CA to keep the part in place on the rod.


Aloha.  Clayton


Timer Program App and Lubrication with Graphite

Simplicity by Christopher Sesco
A short time ago Christopher completed his Simplicity and sent me pictures of his wonderful build.  He was able to get his Simplicity running on 2.2 pounds (1 kg) of drive weight by substantially decreasing the internal friction in his clock, and in his email he describes what methods and materials he used to accomplish that.  Getting a Simplicity to run on such a light drive weight is an impressive accomplishment and a testament to his high level of craftsmanship.  However, in addition, he has some other really exciting information that he wanted to share with all my builders.  Below he describes how he used a free app to get the timing of his Simplicity into a truly accurate beat.

Thank you for sharing the following information, Christopher.  This is a brilliant re-purposing of the Shot Timer app.  Read on to find out how Christopher achieved such accuracy in his wooden clock...

Christopher writes...

I wanted to share with you a few things that have helped me keep her (Simplicity) running smoothly.
First, everywhere there is brass-on-brass contact I have lubricated with dry graphite. 
Next, a friend of mine informed me of a Teflon powder that piano repairmen use on piano keys. I applied a very light dusting to all wood-on-wood contact points. After a short wear in period the clock runs very smooth, on very little weight. 
Lastly,  while trying to set the clock into perfect beat, I utilized a pistol shooting timer program that I had installed on my phone. IPSC Shot timer (android) is a free app, designed for pistol shooters to record shot timing. After setting the microphone threshold sensitivity very low, it is capable of recording clock beats. This program is excellent for using on clocks. Turn it on near the clock and let it run for a moment, paying attention to the 'split time' and result table. This shows me down to the hundredth of a second each beat of the clock. 
Instead of letting her run for a few days and making a fine adjustment, I can set her in near perfect beat within a few minutes. 
It is interesting to see because you can even identify teeth that are slightly different, by slight discrepancies in the beat times. After marking and sanding down a few teeth, the clock runs beautifully.
I highly suggest this approach.

Thank you again, and keep creating your amazing designs.