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Cherry M7
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==Description== The switch has many design variations, including different keycap mounts (tee, bar, and cross), upright and angled stem, multiple contact types, latching action, integrated illumination, and various pole/throw combinations. Travel is 4Β±0.5 mm, with actuation at 2.4Β±0.8 mm. Actuation force for a basic switch is given as 71Β±15 cN in a Cherry specification (based on US to metric conversion), and 70Β±15 cN in a catalogue. Other variants of the switch used different actuation forces. The switch shell is sealed during manufacture; the specific process used is unknown. The switch cannot be opened up without damaging it: in some cases, the base can be pulled clean off the switch, but otherwise, it must be sliced apart with a knife. Reassembly of an opened switch involves gluing it back together. The contemporary [[Futaba complicated linear]] switch sealed only the contact mechanism, but the switch required significantly more complexity to achieve this. The switch is only suitable for plate mounting. ===Parts=== A single pole single throw (SPST) switch consists of 6 parts: *Shell *[[Slider]] *[[Return spring]] *Solid metal contact *Contact [[leaf spring]] *Base Small nubs on the base of the slider hold the return spring onto the slider; the spring can be pulled clear of these easily, and returned onto these nubs using tweezers. Double pole single throw (DPST) switches feature a second set of contacts on the opposite side of the switch. ===Operation=== "Wings" on either side of the slider hold the contact leaf away from the static contact. When the slider is depressed, the leaf spring is able to make contact with the static contact plate. SPST switches typically have symmetrical wings designed to operate two sets of contacts, but they can also be found with asymmetrical sliders that operate only a single pair of contacts.
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