L-702SP Streamlines Bearing Bore Reconditioning

Hi-Tech Compressor and Pump reconditions bearing bores in large compressors with either thermal spray or sleeves (both processes are done in house), and we re-machine them to a close-tolerance diameter. Regardless of the recondition method used, the challenge is to maintain tight OEM tolerances on concentricity and perpendicularity to a reference bore. Our previous method of setup was to tram the housing to the horizontal boring mill spindle using dial indicators. This process was time consuming, plus it was hit-or-miss as to maintaining required tolerances. Also, we lacked an accurate method of final inspection to measure and verify the finished bores.

I reached out to Hamar Laser and scheduled an on-site visit and demo of their alignment equipment with Rod Hamar. In preparation for his visit Rod helped me design a fixture to locate Hamar’s L-702SP [Scan Laser with Plumb Beam] to the reference bore. We were very impressed and purchased the alignment system based on the success of the demo.

Using Hamar’s system each housing is now individually aligned to the spindle of our horizontal boring mill in a simple 3-step process: (1) Using the scan plane of the L-702SP laser and the A-1519 target, the laser is adjusted perpendicular to the reference bore. (2) The laser beam is then adjusted to the center of the reference bore with the A-512 target. (3) Now that we have an accurate reference, a beam which is both perpendicular and concentric with the reference bore, the T-261A 4-Axis spindle target is mounted in the spindle. The target, along with Hamar’s system software, is used to square the part with the machine and adjust the spindle to the part centerline within tenths. Finally, a finished inspection is performed repeating steps 1 and 2 above but using the A-514B target adapter (and the A-512 target) to qualify and record the finished bore location.

We shaved a significant amount of time out of our alignment process with Hamar’s system and gained the confidence that we are able to consistently hold the required tolerances. Most important, however, is the confidence and increased business from our customer!

[Read the case study on this application in our Resource Center (click Case Studies tab). The case study was published in CompressorTECH², a leading trade magazine. Step-by-step alignment procedures for the application are available as a downloadable PDF.]