06-08-2018, 12:14 PM
(This post was last modified: 06-08-2018, 12:19 PM by Stuart Giles.)
Hi Bob,
Yes, the teeth on the dynamator gear are at a steeper angle.
regarding my measurements, of course the quick and dirty method I described isn't a substitute for a full set of DP gear tooth gauges or the complicated multiple vernier measuring device I saw being used when I was an apprentice. Looking at a gear I can't immediately tell if it has a 20° or a 14.5° pressure angle, but if printing a known pressure angle gear, and then the unknown gear, There will be a different impression if the pressure angles differ, this can be seen even with the shallow print left by small DP number gears. This was what happened with the factory and Dynamator gears; unfortunately, it doesn't look so obvious in the photo I put up as it did in "real life" in my workshop.
Yes, the teeth on the dynamator gear are at a steeper angle.
regarding my measurements, of course the quick and dirty method I described isn't a substitute for a full set of DP gear tooth gauges or the complicated multiple vernier measuring device I saw being used when I was an apprentice. Looking at a gear I can't immediately tell if it has a 20° or a 14.5° pressure angle, but if printing a known pressure angle gear, and then the unknown gear, There will be a different impression if the pressure angles differ, this can be seen even with the shallow print left by small DP number gears. This was what happened with the factory and Dynamator gears; unfortunately, it doesn't look so obvious in the photo I put up as it did in "real life" in my workshop.