Sherline 1012 – Sensitive Drilling
The sensitive drilling attachment makes it quicker and easier to
drill small holes without breaking drill bits. Using a quill or
handwheel feed to advance drills smaller than 1/16″ in diameter can
lead to broken drills, because the leverage provided by those
methods makes it difficult to “feel” how the drill is cutting. If
you don’t need the micrometer depth control of a handwheel feed,
the sensitive drilling attachment will make your small hole
drilling tasks easier.
The attachment consists of a 5/32″ Jacobs drill chuck that
slides on a central shaft. The shaft attaches to the spindle with a
holder that threads onto the 3/4-16 spindel thread in seconds much
like an end mill holder. A spring contained inside the brass spacer
tube helps support the chuck and return it to the “up” position.
The chuck will hold drill bits from 5/32″ to as small as #80
The attachment is easy to install in a few seconds. Just insert
the spring tube up into the spindle and thread the attachment body
onto the spindle thread. To use, grasp the red, knurled ring which
rides on a ball bearing on the main shaft. Pull the drill downward
against the spring tension and let it return when done.
If you drill a lot of small holes, this attachment will come in
handy. It may even pay for itself in the long run in savings due to
less breakage of expensive small drills.