Bevels and Boxing
Posted: Sun Apr 14, 2019 5:19 pm
I've been trying to design a wooden geared toy. More as a way to learn Gearotic than anything else. The idea is to have a box with a crank on the outside that turns and moves some gears. I would like to have the crank on one side that is connected to a bevel gear inside the box so the gears are 90 degrees from the crank (horizontal gears, crank on the side). Since bevel gears are rather difficult to machine on a 3-axis CNC I thought cage gears might be the solution. It doesn't appear that Gearotic currently supports bevel cage gears (not sure if that's actually a term, just made it up) so I've been trying to come up with a workaround. First I create a bevel gear and pinion on the screen with 30 and 15 teeth respectively. Then I go to the Cage gear setup and create a wheel with 30 teeth and pinion with 15. I place the wheel on the same shaft as the bevel wheel right on top of it and then delete the bevel wheel. Then I go back to the Cage screen and switch the values of the teeth so the wheel now has 15 teeth. I add this wheel to the shaft of the bevel pinion and then delete the pinion. At this point Gearotic starts to behave badly with the pins on the pinion gear spreading out across the X axis. The Z axis gets huge and trying to rotate the model does some pretty strange stuff.
Kind of a long winded way of asking if you could add the ability for bevel cage gears.
Some other things I noticed:
1. The boxing routine doesn't seem to create holes for the pinion shaft on bevel gears. Front and Rear sides have holes, Right and left don't.
2. In one of my test projects I created some spur and logarithmic gears and then added a bevel wheel and pinion. The pinion didn't have a shaft. Tried clicking the, "add shaft" button but didn't seem to work. If I create the bevel gears first, both gears have shafts.
3. Is there some way to flip bevel gears upside down so the pinion points the other direction?
Thanks,
Rick
Kind of a long winded way of asking if you could add the ability for bevel cage gears.
Some other things I noticed:
1. The boxing routine doesn't seem to create holes for the pinion shaft on bevel gears. Front and Rear sides have holes, Right and left don't.
2. In one of my test projects I created some spur and logarithmic gears and then added a bevel wheel and pinion. The pinion didn't have a shaft. Tried clicking the, "add shaft" button but didn't seem to work. If I create the bevel gears first, both gears have shafts.
3. Is there some way to flip bevel gears upside down so the pinion points the other direction?
Thanks,
Rick