Rack & Spur Gear Mate
Rack & Spur Gear Mate
(OP)
I have a rack and a spur gear that I would like to mate so as I push the rack along a channel, it will rotate the spur gear.
Is this Possible?
Is this Possible?
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RE: Rack & Spur Gear Mate
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Bring back the HP-15
www.hp15c.org
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RE: Rack & Spur Gear Mate
RE: Rack & Spur Gear Mate
If there are not a lot of teeth, physical dynamics may work but can be a pain for this type of thing.
RE: Rack & Spur Gear Mate
I mated the cylindrical surface of the pinion to the edge of one of the rack teeth and then selected my gear ratio.
Perhaps I'm missing something but it seems to be what you're looking for.
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Bring back the HP-15
www.hp15c.org
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RE: Rack & Spur Gear Mate
RE: Rack & Spur Gear Mate
It won't take anything greater than 1:10000
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Bring back the HP-15
www.hp15c.org
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RE: Rack & Spur Gear Mate
The advanced mate does not work for rack/pinion in a realistic way. You can visualy see this by using a long rack and moving the rack to generate pinion rotation. It appers that the gear ratio is not consistent.
The only way to do it is to use equations to link the rack and the pinion.
Hope this helps
Emil Nicoara
RE: Rack & Spur Gear Mate
My solution was to use the concept of a motion limiter and mate to a distance from a point on the rack to a point on the gear. As I move the rack the gear will turn accordingly keeping the same distance from point to point. Grant it this will only work with a partial turn, but I only needed 120 degrees of rotation on my gear. Maybe this will inspire another or better way of accomplishing this.
Hope it helps.
Dale
RE: Rack & Spur Gear Mate
RE: Rack & Spur Gear Mate
If you don't mind cheating, one way of creating a convincing, if not technically accurate, rack & pinion mate is as follows:
-Sketch a pitch circle on the pinion, and a pitch line on the rack.
-Sketch an arc on the rack, tangent to the pitch line, with a radius of 10000 x the pinion pitch radius.
-In the assembly, create a couple of temporary mates to line-up the teeth, then suppress them.
-Then create a 10000:1 gear mate between the rack's arc sketch and the pinion's pitch circle.
obviously, the larger the arc radius on the rack, the more accurate the motion will be, but there seems to be a limit of 1000000mm.