neat. bastard to calculate and produce without the 3Dprinter.
theres nothing wrong with planetary gears except they rely on a PLANET CARRIER, for all you ignorant morons such as festerbable, to achieve anything useful.
the real question is "do the centre distances between planet gears remain fixed or do they vary?"
logic says they would change so the only real practical use would be as seperate crank pins following a non sinusoidal motion, or as a pump...
@headsmess Traditionally a planet carrier is used, but it's hardly a requirement.
For example, you could sandwich the entire mechanism together and put thrust bearings on both sides of each planetary gear. Or you could cut axle paths in the sandwich sides and use standard bearings.
Because the inner shape is 3-sided and the outer shape is 5-sided, the gear ratio between them should be 3:5. Since the gear teeth should be the same size to work, the inner and outer gears also have a 3:5 ratio when it comes to the length of the shapes.
The inner shape is based on a formula, so that's the starting point. I then wrote a small program to calculate the rest of the shapes. It rotates a round gear around the inner shape to calculate the outer shape. It varies the radius of the round gear until the outer shape has 5/3 the length of the inner shape. From there on it is basic 3D modeling.
@jvohome Thank you for your quick response....you're very helpful I would like to know the formula you're talking about because that is the part I'm missing.
It's a computer animation.
MacRief 2 months ago
sexy.......
mensamoo 3 months ago
neat. bastard to calculate and produce without the 3Dprinter.
theres nothing wrong with planetary gears except they rely on a PLANET CARRIER, for all you ignorant morons such as festerbable, to achieve anything useful.
the real question is "do the centre distances between planet gears remain fixed or do they vary?"
logic says they would change so the only real practical use would be as seperate crank pins following a non sinusoidal motion, or as a pump...
headsmess 3 months ago
@headsmess Traditionally a planet carrier is used, but it's hardly a requirement.
For example, you could sandwich the entire mechanism together and put thrust bearings on both sides of each planetary gear. Or you could cut axle paths in the sandwich sides and use standard bearings.
zenin4711 2 months ago
What's wrong with planetary gears?
XxENovaxX 3 months ago
Hmm. For one revolution of the inner gear, how many revolutions does the outer gear do? None. How is this a gear at all?
FesterBable 3 months ago
Looks expensive to make in a shop.
narnianhero 3 months ago
Neat but why? what's the advantage over a circular plantetary system?
MrROTD 3 months ago
How do you calculate the gear's path and ratio....?
AhmadAboulFarag 5 months ago
@AhmadAboulFarag
Because the inner shape is 3-sided and the outer shape is 5-sided, the gear ratio between them should be 3:5. Since the gear teeth should be the same size to work, the inner and outer gears also have a 3:5 ratio when it comes to the length of the shapes.
jvohome 5 months ago
@AhmadAboulFarag
The inner shape is based on a formula, so that's the starting point. I then wrote a small program to calculate the rest of the shapes. It rotates a round gear around the inner shape to calculate the outer shape. It varies the radius of the round gear until the outer shape has 5/3 the length of the inner shape. From there on it is basic 3D modeling.
jvohome 5 months ago 2
@jvohome Thank you for your quick response....you're very helpful I would like to know the formula you're talking about because that is the part I'm missing.
AhmadAboulFarag 5 months ago
There must be some amazing point to this
Hell if I know
But there probably...meh, probably not
BladeLigerV 5 months ago 2
This is really interesting. Does it have any practical applications, or is it just an engineering/geometric exercise?
skinnyguinnea1223 7 months ago
I have faith that hypotrochoid gear systems are against the laws of physics! Destroy that heresy at once, blasphemer!
matcotech 8 months ago 2
@matcotech LOL!
thegiops 5 months ago
i loved it
craziux 10 months ago
how do you calculate the dimensions?
AhmadAboulFarag 10 months ago
Fascinating stuff! Beautiful geometry! Hope to see more posts. . .
UjjwalRane 1 year ago