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Split plate cam |
The main advantage of the split plate cam is that we don’t have to dismantle the machine’s rotation shaft in order to replace, add, remove, and adjust it. The easiness of adjusting it permits to mounts many cams together (side by side), and final reduce the machine’s overall dimensions.
The split plate cam usually works with radial translating and swinging roller follower.
Although machining of all the cam displacement curves is possible, the cycloid motion is best for high-speed assembly machines (see Machinery’s Handbook, “cams and cam design - cycloid motion page 2053”.
One consideration when machining the cam displacement curve is the selection of the start (“zero”) point. The start point is a tooling hole, usually designates the zero degrees point in cam displacement curve. In multi split cam arrangement machines we must design the cam displacement curves of all cams knowing that at a given rotation angle all the cam’s bolts are facing an opening or a port in order to assembly/disassembly.
Split plate cam manufacturing phases (dimensions in metric system).
PHASE 1
MATERIAL: CASE HARDENING STEEL
PHASE 2
COARSE MACHINING
PHASE 3
CAM SPLITTING-GRINDING SPLINTED FACES
PHASE 4
MAKE FASTENER’S HOLES
MOUNT THE TWO HALVES TOGETHER MACHINING HUB’S HOLE AND OUTSIDE DIAMETER
PHASE 5
GRINDING BOTH CAM FACES
MACHINING THE ORIENTING SLOT
HARDENING TO 60-62 HRC
PHASE 6
GRINDING BOTH CAM FACES
JIG-GRINDING THE HUB’S HOLE
GRINDING SPLINTED FACES 0.05mm TOTAL FOR CORRECT SHAFT CLAMPING
PHASE 7
MILLING THE CAM DISPLACEMENT CURVE
BEFORE CLAMPING THE CAM STRONGLY ROTATE IT TO THE DIRECTION OF THE MILLING CUTTER PATH TO ELIMINATE THE CLEARANCE BETWEEN THE ORIENTING SLOT AND THE CAM’S FIXTURE
manufacture the cam