Figure 24: Medeco 3200 and 3100 Interchangeable Cores – Comparison Chart Core Type: IC Use: 3200 UL437 Listed? CTRL Location: CTRL Turn Direction: CTRL Key Blank: CTRL Shear Line: Medeco IC Housings Yes #3 & #4 Counterclockwise Same Yes CTRL Key Origination: Copy TMK #1, #2, #5, #6; Raise cuts #3, #4 Figure 23. This image illustrates Medeco’s M3 mortise cylinder. into the shell from its location in the plug prevents the plug from moving without the sidebar being withdrawn into the plug. This means that with the bottom pins positioned correctly in place, it’s pos- sible for the sidebar to allow the plug to turn. Thus, when the pressure of the key turning the plug is created, and — with the correct combination of pins and key cuts — the sidebar is freed from its ex- tended state. It then is able to nestle itself comfortably into the plug and can enjoy the ride around the shell! The grooves in the sidebar fit nicely into the sides of bottom pins, and no other pins in the chambers need to con- cern themselves with the sidebar and its sentry-like function. But, if the bottom pins aren’t aligned to allow the prongs of the sidebar to enter, the prongs will push against the bottom pins and remain sta- tionary as they binds against the shell. 46 KEYNOTES DECEMBER 2015 CTRL Type: Ring/Lug s that there won’t be enough he sidebar to be released from ion into the shell and plug ro- l not be possible. hnology linders that use the M3 tech- lude: 1. Rotating and angled bottom pins 2. Sidebar mechanism 3. Slider mechanism The slider mechanism is spring-loaded and makes contacts with the bittings lo- cated on the side of Medeco keys. When the side bitting makes contact with the slider upon key insertion, the slider is pushed to a position that will align the blocking tabs on the slide gates in the sidebar. This action allows the sidebar legs to move into the slots located on the sides of the bottom pins when turning force is applied to the key. If an incor- rect key is inserted, or, when there is no key present in the cylinder, the blocking tabs will prevent the sidebar legs from entering the slots located on the sides of the bottom pins. Usually, the plug in the IC will not have to be disassembled for combinating; therefore, neither the sidebar mechanism 3100 Yale IC Retrofit No Back of Core Clockwise 6-1/2 pin No Copy TMK cuts onto lon- ger blank Cam nor the slider mechanism should have to be serviced. Medeco keys are not back- ward compatible to 3200 ICs that aren’t M3. For more information on working with the M3 system, refer to the Medeco M3 Technical Service Manual. In the third and final article installment, the author will discuss LFIC components and master keying. A special thank you is extended to Clyde T. Roberson, CML, AHC, CPP, director of Medeco, for his assistance in preparing for this article. illiam M. Lynk, CML, S, ICML, M.Ed. has been ocksmith since 1975 d is the owner of www. Sglobal.com. Bill is an IC specialist, an industry author, the subject matter expert on IC for ALOA, and an ALOA ACE instructor, teach- ing classes on interchangeable cores and master keying across the country. He has originated SFIC Technical Manuals for both national and international lock manufactur- ers, and maintains a working relationship with the major lock and security manufactur- ers throughout the world. In 2013 and 2015, he was named Keynotes Author of the Year. WWW.ALOA.ORG
