TechTalk Nov/Dec 2015

By Staff

AUTOMATED EDGING

In today’s high production environment automation trends continue to flow around the lab especially in finishing. There are several key aspects to automating edging that are important to review and while some are obvious such as production capacity, there are others that can be overlooked. An important aspect to automated edging is the ability to process each lens individually. This means looking at options where the edger operates with independent spindles. There are a couple of key aspects here that are important: lens quality is increased as each eye can be edged to the specific needs of the Rx, frame and wearer measurements. Also, with independent spindles you have a bit of redundancy in the event of an unexpected machine failure in one the spindles.  You also want to consider shape editing software and the ability to edit shapes, create shapes and of course, correct some shapes that may have been traced incorrectly. Ensuring this software is on the machine along with proper training will do wonders for your lab staff as they won’t be scared to make some edits when needed. You’ll also want to consider the automated edger for the bulk of your work, not your ‘specials.” This way you can set the machine up with the right edging tools and let it go without worry that it will get bogged down with special type jobs. There will almost always be the need for a manual edger so let your skilled players handle the real complex jobs while your automating runs through the bread and butter work.
Kevin Cross, director of sales, Schneider Optical Machines

FIXING AXIS ISSUES

Ever had an axis issue and felt like you were chasing your tail trying to fix it?  An axis issue can be one of the most difficult issues to correct however, these few tips can help.  First, assess the situation.  Just because you have one job off axis, doesn’t mean you have an axis issue.  Correcting an issue for one off -axis job could result in multiple new axis issues when there was never actually a problem initially.  There are four main causes of an off-axis job:  1. Tracing, 2. Blocking, 3. Edging, and 4. Slip/twists.  Each one of these presents a unique symptom to help pinpoint the area in need of correction.  With an axis issue due to tracing, both edged lenses will result in a nasal up or nasal down axis deviation.  It’s recommended you check your tracer; however remember the calibration issue may be a result of frame tracing, demo lens tracing or both.  With an axis issue due to blocking, both lenses will have the appearance of being on axis, however, the  power or bi-focal segment will be off in separate directions.  If you have an axis issue due to edging, the nasal of each lens will be off in opposite directions.  Note: distinguishing a blocking or edging axis issue can only be determined when the lenses are still blocked.  With a slip/twist axis issue, one or both lenses can be off axis by an undetermined amount in the direction of the cut.  The shape to block will appear to be on axis; however the power or bi-focal segment will be off axis.  Diagnosing the issue before making a correction will save time and headaches.
Kevin Paddy, director – Finishing National Optronics/Satisloh


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May/June LabTalk 2017