Chrisu02 wrote:
I like this plugin and using it for 3D printing long time, but now i need to make some hypoid gears but it seems that it won`t work 
Chris,
You are partially correct, it will not make a TRUE hypoid gear. The problem is the helix angle sits at the outside diameter, not the pitch diameter where it is supposed to be. If you can calculate the desired helix angle at the mid-point (pitch diameter) based on the helix angle at the outside diameter, then you might be able to get very close to a true hypoid. Keep in mind that this was never intended for production accuracy (call me short-sighted, if you must) but should work well enough for Sketchy Physics animations. Version 2 is planned to be more accurate, but as noted in a recent post, I'm not making any commitments on when it would be available.
Chrisu02 wrote:
My problem is that the helix is straight then the bevel value is 0° but i needs to be curved 
Try specifying a large bevel angle (70-80 deg.), a decent number of teeth (50-100+) and a medium helix angle (25-45 deg.). With a larger pitch diameter (10") and a smaller face width (3") you'll get a large gear that looks similar what you posted. The bevel angle of the pinion (small gear) is the the difference between the bevel of the large gear and the intersecting angle of the axis of both gears (90 deg. - 70 deg. = 20 deg.). The helix angle is also different on the pinion. I think it is a similar calculation (90 deg. - 35 deg. = 55 deg.), but I'm not positive; I haven't make a hypoid set in a long time. If that does not work, then I suggest looking for gear engineering reference information. That's what I did.
Chrisu02 wrote:
the next problem is to make them fit together, is it possible to make a different value (teethsize) as a fixed parameter so the rest of the gear may be calculated to this ?
In order to make a mating gear, it has to have the same diametral pitch [P] (arc length of one tooth and space). You can use gear formulas (via a web search) to figure out how to calculate the dimensions you need to specify a mating gear. Once you've got that figured out, getting them to mesh properly is a bit tricky. I think I had to tweak the helix angle on one of the mating gears to make them mesh better, but again, it's been a while.
Chrisu02 wrote:
i`m no programmer so i don`t know if this would even be possible or home much work it would be. ?
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Almost anything is possible, but I'm not a strong programmer or an engineer, so for me, it will be a lot of work, hence the uncertainty regarding the release of version 2. However, it (backlash) is on the growing list of changes intended in the revision.
Statistics: Posted by jgrundman — Sun Oct 26, 2014 11:21 pm