Making spare gears from existing: what info is needed?
Making spare gears from existing: what info is needed?
(OP)
We have some old equipment (1940s), low speed, intermittent service, outdoors.
We are undertaking to make drawings of all parts, including gears, so that we can have spare parts manufactured. For the gears, we have already recorded overall (outside) diameter; rim, hub, and spoke dimensions; and of course the number of teeth. Just looking at them we can see the gears are castings.
We are sending out a sample gear for testing to determine tooth profile (involute vs. cycloidal) and pressure angle.
What other information would we need to include on the drawings? What would be needed to manufacture spare parts?
We are undertaking to make drawings of all parts, including gears, so that we can have spare parts manufactured. For the gears, we have already recorded overall (outside) diameter; rim, hub, and spoke dimensions; and of course the number of teeth. Just looking at them we can see the gears are castings.
We are sending out a sample gear for testing to determine tooth profile (involute vs. cycloidal) and pressure angle.
What other information would we need to include on the drawings? What would be needed to manufacture spare parts?





RE: Making spare gears from existing: what info is needed?
My advice would be to grab a couple of catalogs from gear manufacturers and pick the gears you want to use. All you would really need is the ratio between the mating gears and the pitch diameters of the gears in mesh to fit your space constraints. This method would eliminate the cost involved with sending the gears out to be inspected and the potential cost of manufacturing a style of gear that is no longer a stock size (ie cycloidal teeth and some pressure angles are not too popular these days). Besides potentially reducing replacement costs, you may also get the benefit of more efficient, stronger gears.
This redesign approach may take a little more time up front, but I think it will pay off in the long run.
Hope this helps.
RE: Making spare gears from existing: what info is needed?
RE: Making spare gears from existing: what info is needed?
RE: Making spare gears from existing: what info is needed?