Version 0.2 of a parametric, OpenSCAD ratchet library. It will generate an inner ring with teeth, and an outer ring with arms that ratchet against the teeth. The latest version adds support for a slant parameter which slants the ratchet teeth and arm faces to provide a basic interlock between the two parts.

Use the lib to generate the inner and outer rings as needed. Integrate the rings with other OpenSCAD elements as your design dictates.

Usage is driven by two methods:

inner_ratchet_ring - inner ratchet ring with teeth outer_ratchet_ring - outer ratchet ring with spring-arms

Each method has a number of configurable parameters. A number of the parameters should match between the two method calls to ensure correct interoperation.

outer_ratchet_ring

• ratchet_direction - direction the ratcheting should occurr, should be "clockwise" or "counter-clockwise"
• inner_ring_diameter - diameter if the inner ring
• inner_ring_height - height of the inner ring
• inner_ring_thickness - thickness of the inner ring
• outer_ring_diameter -diameter of the outer ring
• outer_ring_height - height of the outer ring
• outer_ring_thickness - thickness of the outer ring
• arms - the number of arms we're using
• arm_type - the type of arm to use, currently only "straight" is supported
• arm_head_width - width of the arm head
• arm_head_length - length of the arm head which engages with the teeth
• arm_shaft_width - how wide the shaft should be, preferably less tha head width
• arm_height - height of the arm
• tolerance - gap between the ratchet teeth and arm
• slant - angle to slant the arm faces (should be between 0 and ~50)
• facets - number of facets for the ring

inner_ratchet_ring

• ratchet_direction - direction the ratcheting should occurr, should be "clockwise" or "counter-clockwise"
• inner_ring_diameter - diameter if the inner ring
• inner_ring_height - height of the inner ring
• inner_ring_thickness - thickness of the inner ring
• outer_ring_diameter -diameter of the outer ring
• outer_ring_height - height of the outer ring
• outer_ring_thickness - thickness of the outer ring
• arms - the number of arms we're using
• arm_type - the type of arm to use, currently only "straight" is supported
• arm_head_width - width of the arm head
• arm_head_length - length of the arm head which engages with the teeth
• arm_height - height of the spring arms
• teeth_multiple - multiplier against the number of arms to determine how many teeth to create total
• tolerance - gap between the ratchet teeth and arm
• slant - the angle to slant the ratchet teeth
• facets - the number of facets for the ring