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Originally Posted by Tristan Lall
Also, PIC Design is just about the only source that anyone's been able to find for 0.7 module gears (high-precision metal ones, anyway). They've been very slow with orders (think 1-2 months, when they promised a couple of weeks, even with nagging phone calls, etc.) |
We had slow turn-around for our first order with PIC (over the summer). However, when ordering a spare gear after ship date, they supplied us in a fairly reasonable time frame. I guess it depends on whether they have stock on hand or not. Probably something that can be verified with a phone call if time is tight.
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Originally Posted by Tristan Lall
Also, I've found that the drill motor pinion seems to like a little bit of extra centre distance, in order to mesh correctly (due to a slightly enlarged, non-standard tooth form). I'd suggest using about 0.007" to 0.010" extra centre distance, to allow for a better mesh. If you use the standard theoretical centre distance (based on pitch diameters), the gears will mesh too tightly.
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In 2001, 2002, and 2003, we used the first stage of the drill motor gear box "as is" (we made a custom planetary shroud).
In 2004, we went with a straight up spur gear stage using PIC design gears (48 teeth, I think). We used the theoretical center-to-center distance and did not experience any significant losses or loads. We did a no load current measurement with and without the gear box on both drill motors and did not see a rise in current.
We've also inspected to see if there is excessive wear, and things look fine.
I suppose, in the off-season, we can make some test fixtures with different center distances and measure load currents to see if this is an issue. However, I don't see the need to use extra center distance.