Belts

PulleyGen with Mods (we didn't make the original)

Based off the highly popular HTD Pulley doc, our version adds several new features useful for creating custom pulleys. Here's what we added:

• Integrated pattern spacers: A configuration allows you to add a pattern spacer to one flange of the pulley. This pattern spacer is 32mm in diameter, matching goBILDA's pattern spacers and standard sizing. The length of the spacer is configurable. No longer do you have to derive a pulley into a part studio to add a pattern spacer to it! Having it integrated also reduces part count of assemblies and makes manufacturing easier to keep track of.

• Shaft reinforcement: Using Onshape's composite part functionality, we made a configuration to integrate a triangular aluminum plate into each side of the pulley. These plates are designed to reduce bore stripping on pulleys printed with a 7mm hex bore (which fits on an 8REX shaft). This function has been tested on a drivetrain by team 10355 Project Peacock with great success. The aluminum plates can be waterjet cut or laser cut by SendCutSend.

• Back-side nut pockets: Have you ever needed to put two pulleys onto one wheel, one on one side and another on the other? This is a common problem in custom 6WD drivetrain design that is easily solved by adding nut pockets to the back side of the pulley. These hold the nylock nuts from the other pulley captive, making it easy to have the reliability of nylock nuts on both pulleys in a very compact package. The pockets are made with a 0.2mm tolerance for 3D printing, which is small enough to keep the nut from turning inside it.

• Color Configuration: Oooh pretty colors (full hex-based color configuration coming soon)

Link: cad.onshape.com/documents/a116695750b054564ac11cbb/w/2025d9645023834db075348e/e/87987a3f29f6075a645ceb7b 

Basic Belt Gen

Basic Belt Gen allows for the creation of 6 different accurate belt profiles. These profiles are:

• HTD3

• HTD5

• HTD8

• GT2 (2mm)

• GT2 (3mm)

• GT3

Each profile has been modeled from its manufacturer spec sheet, and all dimensions match the real belt. The number of teeth, pulley center-to-center, and pulley sizes are all configurable, as is the thickness. The default material is neoprene.

This doc is useful when you already know the right center-to-center distance for your design and wish to add tolerance to the spacing without messing up the belt generation.

Link: cad.onshape.com/documents/1ee229f38a9c097e38383d06/w/9b002ade873f395d9c5d24ce/e/5bea9a0b868f45a81fab9cc2 

Beltgen + Calculator

This doc expands on the Basic Belt Gen's capability by offering the ability to measure the proper belt size for an application, eliminating the need for external calculators. Its tooth count, thickness, pulley size, pulley center-to-center, and tooth pitch are all configurable. Its teeth are not as accurately modeled as the Basic Belt Gen's, and their sizes are not configurable, but this doc will tell you if your selected pulley center-to-center and sizes are appropriate for the belt pitch you're using.

Link: cad.onshape.com/documents/655b133fd5f1e35f931c1eaf/w/f36aa7f6aeba2fc9ca7dc478/e/9bf9c141684b1430aeb75e6f