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(1*)  BullseyeBore Core and the accessories were designed with the goal of working with most common standard electric drills and drill chucks, but due to the vast number of drill and chuck combinations, some careful user testing is required prior to use. Please read and follow the BullseyeBore Core Safety Guidelines before attempting to use BullseyeBore Core or any accessories on a drill or in an actual drilling operation.

As with all drilling applications, some confined and safe testing should be done first in the expected environmental conditions to assess both worksurface pattern visibility and overall safety.

Unlike other drill alignment solutions, the Core is also contactless and does not touch the worksurface, so there is never any danger of marring or denting the worksurface.

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Depending on the chuck face dimensions and size, an optional Standard Chuck Alignment Guide may be required to prevent displacement of BullseyeBore Core across the chuck face or detachment during rotation.

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The projection of these two patterns makes the worksurface alignment process very simple and quick: when the Alignment Pattern and Reference Pattern are concentric, the drill is aligned perpendicularly with a flat worksurface. Conversely, if the Alignment Pattern and Reference Pattern are non-concentric and the Alignment Pattern is elliptical, then the drill is misaligned with reference to the flat worksurface. The patterns produced by BullseyeBore Core simply capitalizes on the brain’s ability to visually evaluate circular shapes and concentricity very quickly, and thus provides drill users with the ability to also interpret drill alignment or misalignment rapidly.

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The chart below provides a quick guide to compatibility based on the drill and chuck type for BullseyeBore Core and the Standard Chuck Guide and Chuck Extension accessories. Additionally, the BullseyeBore Core FAQ contains much more details on Drill and Drill Chuck compatibility for BullseyeBore Core and its accessories.

The standard versions of BullseyeBore Core (CR1-100 and CG1-100) project a single Reference Pattern and a single Alignment Pattern on the worksurface and are designed for an operational drilling range of 2” to 5”. This represents the length of most standard drill bits.

As a general guide, if you plan to use BullseyeBore Core with standard length drill bits in the range of 2” to 5”, select from the standard versions of BullseyeBore Core (CR1-100 and CG1-100). Conversely, if you intend to use BullseyeBore Core with a wider variety of drill bit lengths in the 2” to 8” range, or you plan to use specialty bits such as Spade, Augur, Aircraft, Step, or Forstner bits, select from the extended versions of BullseyeBore Core (CR1-101 or CG1-101).

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The extended versions of BullseyeBore Core (CR1-101 and CG1-101) introduce a second Alignment Pattern. In these extended versions the first and second Alignment Patterns are projected at slightly different angles which translate into different diameters on the worksurface and thus work with a wider array of drill bit lengths.

The standard versions of BullseyeBore Core (CR1-100 and CG1-100) project two beams on the worksurface that produce circular patterns during drill rotation. The first beam is projected parallel to the drill bit. This projection is known as the Reference Beam, and this beam produces a circular Reference Pattern on the worksurface while the drill is rotating. The Reference Pattern is generally circular and unchanging even if the drill is misaligned (tilted) with reference to a flat worksurface.

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BullseyeBore Core works in any orientation, so it can easily be used on walls, floors, ceilings, or boards at any angle.  The Core’s unique shape also allows it to be virtually invisible during drill rotation, so the drill bit, worksurface, and the Core’s projected worksurface patterns are clear and easy to see.

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As a general guide, if you plan to use BullseyeBore Core indoors and battery life is important, select the Core Red versions CR1-100 and CR1-101. Conversely, if you intend to use BullseyeBore Core in bright indoor conditions or indirect sunlight, choose the Core Green versions CG1-100 and CG1-101.

(3) This is the "Maximum Recommended Drill Bit Length" without use of an optional BullseyeBore Core Chuck Extension. A Chuck Extension makes use with longer bits feasible.

The “Core” is designed to work seamlessly with common electric drills by mounting magnetically to the flat front face of the drill chuck. When the drill rotates, BullseyeBore Core rotates at the same speed and projects a series of circular patterns on the worksurface that indicate alignment or misalignment of the drill bit with regards to the worksurface. When the patterns are concentric, the drill is straight with (and perpendicular to) the worksurface. Conversely, when the patterns are non-concentric, the drill is misaligned with the worksurface.  These patterns make it easy for DIYs and Pros alike to always drill straight.

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DrillGuide

BullseyeBore Core and the accessories were designed with the goal of working with most common standard electric drills and drill chucks, but due to the vast number of drill and chuck combinations, some careful user testing is required prior to use. Please read and follow the BullseyeBore Core Safety Guidelines before attempting to use BullseyeBore Core or any accessories on a drill or in an actual drilling operation.

The extended versions of BullseyeBore Core (CR1-101 or CG1-101) introduce a second Alignment Pattern for a total of one Reference Pattern and two Alignment Patterns. The two Alignment Patterns are projected at different diameters on the worksurface and are designed for operational drilling range of 2” to 8”. The Alignment Patterns also provide more flexibility when using specialty drill bits such as Spade, Augur, Aircraft, Step, or Forstner bits.

There are four versions (models) of BullseyeBore Core with different characteristics for laser color, battery life, and operational drilling range.

Please see the BullseyeBore Core Product and Accessory Compatibility Guide to see if your drill is compatible with BullseyeBore Core. Always read and follow the BullseyeBore Core Safety Guidelines before attempting to use BullseyeBore Core or any BullseyeBore Core accessories on a drill or in an actual drilling operation.

Moreover, BullseyeBore Core’s unique magnetic connection to the chuck face makes it safe to use.  If a foreign object mistakenly comes into contact with BullseyeBore Core during rotation, the magnetic connection between the Core and the drill chuck is immediately broken, and the Core’s rotation ceases (even if the drill bit is still spinning). The magnetic connection also makes attachment and detachment quick and easy.

Still have a question about BullseyeBore Core, BullseyeBore Core accessories, drill compatibility or drill bit compatibility? Check out the extensive BullsyeBore Core FAQ where there are answers and guides for 60+ topics.

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BullseyeBore Core is a patented power drill accessory that helps you to always drill straight (which means perpendicular to the worksurface).

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The Core Red versions CR1-100 and CR1-101 utilize a red laser and the Core Green versions CG1-100 and CG1-101 utilize a green laser. The Core Red versions use less power than the Core Green (green laser) versions and thus offer better battery life. Conversely, the Core Green versions use a 520nm green laser that is in the middle of the visual frequency spectrum and generally easier to see in bright conditions versus the Core Red versions. The trade-off between the two laser colors is battery life versus visibility.

The second beam is known as the Alignment Beam, and this produces a single Alignment Pattern on the worksurface while the drill is rotating. Much like the Reference Pattern, the Alignment Pattern is essentially circular when the drill is aligned with a flat worksurface, but unlike the Reference Pattern, the Alignment Pattern will distort into an elliptical shape when the drill is misaligned (tilted) with regards to a flat worksurface.