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Rack

Rack

By Senku Ishigami

HIGHLIGHTS
  • Converts rotation in linear motion
  • Meshes with spur gear of same profile
  • Can tolerate large errors in distance between gear and rack
OVERVIEW

When driven by a spur gear, a rack can be used to make a simple linear actuator with constant ratio between rotation and translation.

To mesh, the gear and the rack must have the same pressure angle and thesame module. Addendum, dedendum and backlash can be different, but together they set the distance between the rack and the gear.

DESIGN REQUIREMENTS
Machine The component will be designed to the chosen machine specifications =
Material Only the selected materials will be considered for the design =
PLA +2
Teeth n Number of teeth =
Mod Module for the teeth; bigger module, bigger teeth = mm
Face width Sets the thickness of the gear = mm
Force nom The force which the rack if expected to sustain under nominal conditions = N
Force max The maximum force which the rack needs to be able to support without failing immediately = N
Mass Component mass will not exceed this value kg
Temp min Will work down to min temperature or lower °C
Temp max Will work up to max temperature or above it °C

ADVANCED
Pressure angle = °
Addendum coef Addendum (how much the teeth extend outwards, in mm) will be this * mod =
Dedendum coef Dedendum (how much the teeth extend inward, in mm ) will be this * mod =
Backlash How much thinner the actual teeth is compared to the nominal profile = mm
Clearance Extra clearance between dedendum radius and the bottom of the tooth = mm
Cycles Minium number of loading which each teeth must be able to withstand before breaking k cycles
Tooth k Stiffness of a single tooth kN/mm

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.zip folder with

FILE Printing handbook .pdf A copy your design requirements .txt Bill of materials .csv 3D models approx. 250kB

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Generating files

3D PRINTER SETTINGS

Nozzle d Nozzle diameter. If possible, features thickness will be chosen as a multiple of this value. = mm
Min layer t Minimum layer thickness. Smallest height which ensures good quality. = mm
Min w Minimum width which ensure a good quality print. This is the thinnest wall you can print. = mm
Min tol Minimum tolerance. The smallest value x such that a cylinder of diameter d will fit in a hole of diameter d+x. = mm
Pip tol Print-in-place tolerance: defined as Minimum tolerance, but with the cylinder printed inside the hole. = mm
Printer bed size x Size of the printing bed = mm
Printer bed size y Size of the printing bed, perpendicular to x = mm
Printer max h Maximum height for a printed part = mm
Max bridge Max length for a bridge = mm
Max overhang Max overhang angle, measured from the vertical (90 deg is horizontal). = deg
Francesco

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