To transmit motion between two shafts. or a shaft and a slide. Sliding motion between Gears tooth surfaces. Omega = Angular Velocity (rad/s) Omega1*Radius1 = Omega2*Radius2 Practical limit for Velocity Ratio... for Spur Gears = 6 for Helical Gears = 10 for higher ratios, two or more Gear Pairs are used. Parallel Shafts: Spur Gears - since Line Contact, - Sudden application of load, - high impact stresses, - excessive noise at high speeds. Helical Gears - starts with a point contact and extends along a diagonal line across the teeth - low impact stresses, reduction in noise. Spur Rack (infinite diameter), Pinion, Gear External Gear, Internal Gear External Pinion, External Gear => One rotates in CW, One rotates in CCW External Pinion, Internal Gear => Both rotate in same direction
By the way I'm a Mechanical Design Engineer. And I was pretty poor at designing. And I feel this is pretty easy way to learn to design things. My Mantra towards designing things is (if you're not a pro), start with pretty basic geometry and build from there. Since you'll be building things only virtually, you shouldn't be wasting any material or energy. So, for the first tutorial let's move on with designing an ice cube. My choice of CAD software for accomplishing this would be Autodesk Fusion 360. Being a simple person and also a math fanatic, I start with simple geometries.. something like below. The next step I will be doing is to taper all the sides with a draft of 15 deg. After the modification the design will be altered as below. Fusion allows us to do this by rotating the side faces about the top edges by means of a Mystic Wheel . Note: There is another way to achieve the above design, by Lofting the above and below face sketches. And the reason for not