A laser guide for rotating tools comprises a first housing portion and a second housing portion. A seal is provided between the first housing portion and the second housing portion. A lens is located in the first housing portion or second housing portion. A seal is provided between the lens and the first housing portion. A method of testing a laser guide comprising applying a pressure to an internal chamber of the laser guide. Monitoring the laser guide for pressure gains or losses in the chamber.
1. A laser guide for saws having arbors comprising:
a first housing portion and a second housing portion, wherein the first housing portion and the second housing portion define an interior aperture therethrough;
a seal between the first housing portion and the second housing portion;
a lens located in the first housing portion, the lens configured to transmit light to the exterior of the laser guide along a path substantially perpendicular to an axis of the interior aperture; and
a seal between the lens and the first housing portion.
2. The laser guide of claim 1 where the first housing portion and second housing portion meet along a first seam and a second seam, a seal formed along each of said first seam and said second seam.
3. The laser guide of claim 2 where the interior aperture defines the second seam.
4. The laser guide of claim 1 wherein the lens is located in a lens holder.
5. The laser guide of claim 4 wherein the lens holder is secured to said housing.
6. The laser guide of claim 4 wherein the lens is sealed to the lens holder about its periphery.
7. The laser guide of claim 6 wherein the lens is sealed to the lens holder using adhesive.
8. The laser guide of claim 6 wherein the lens is sealed to the lens holder using a sealant.
9. The laser guide of claim 6 wherein the lens is sealed to the lens holder using a mechanical seal.
10. The laser guide of claim 6 wherein the lens is sealed to the lens holder along non-optical portions of the lens.
11. The laser guide of claim 6 wherein the lens holder is sealed to the housing.
12. The laser guide of claim 1 wherein a test port is located in the first housing portion or the second housing portion.
13. The laser guide of claim 12 wherein the housing defines an internal chamber and the test port communicates the internal chamber.
14. The laser guide of claim 13 wherein the test port is adapted to communicate positive or negative pressure to the internal chamber.
15. The laser guide of claim 12 wherein the test port is sealed.