> On Dec 24, 2017, at 3:27 PM, John Leyden  wrote:
> 
> My (possibly incorrect/incomplete) understanding is that solid center augers
are supposed to be less likely to flex when drilling very long/deep holes.
Therefore, I infer that they may also be able to handle more torque than a twist
auger bit might (as when driven by a power drill).

The augers used for deep holes on ships are, oddly enough, called ship augers.
Usually use a gi-gundous drill motor on them, but they still have no solid
center:

https://www.toolnut.com/milwaukee-48-13-3000-3pc-18-ship-auger-bit-set.
html?utm_source=google_shopping&gclid=CjwKCAiAvf3RBRBBEiwAH5XYqKt4daLCnyWTTVv24-
GyVZVyRTIAg4MuyO1aioQql6BHWbhsDE_UzRoCza8QAvD_BwE">https://www.toolnut.com/milwa
ukee-48-13-3000-3pc-18-ship-auger-bit-set.html?utm_source=google_shopping&gclid=
CjwKCAiAvf3RBRBBEiwAH5XYqKt4daLCnyWTTVv24-GyVZVyRTIAg4MuyO1aioQql6BHWbhsDE_UzRoC
za8QAvD_BwE <https://www.homedepot.com/p/Klein-Tools-7-8-in-Ship-
Auger-Bit-53439/100662405?cm_mmc=Shopping|THD|google|&mid=sUh3yTzF9|dc_mtid_8903
7lm25188_pcrid_118170493868_pkw__pmt__product_100662405_slid_&gclid=CjwKCAiAvf3R
BRBBEiwAH5XYqNhwFOFiBtmeIkNzmoPu99DB1aZ1tdZnZu437HNVY0e_alGVxV8fpRoCHP8QAvD_BwE"
>https://www.homedepot.com/p/Klein-Tools-7-8-in-Ship-Auger-Bit-53439/100662405?c
m_mmc=Shopping|THD|google|&mid=sUh3yTzF9|dc_mtid_89037lm25188_pcrid_118170493868
_pkw__pmt__product_100662405_slid_&gclid=CjwKCAiAvf3RBRBBEiwAH5XYqNhwFOFiBtmeIkN
zmoPu99DB1aZ1tdZnZu437HNVY0e_alGVxV8fpRoCHP8QAvD_BwE>

The description says they are rated for use with an impact driver - although
why?  The barefoot bits commonly used on ships are just as long and also have
this same single twist configuration.

Ed Minch