Compound gear meshing trouble with rack
Compound gear meshing trouble with rack
(OP)
I'm new to the forum. I was designing a beating mechanism which consists of 2 arms hitting a variable diameter stem of a plant. These arms are pulled back by the driving gear(s) and when released, slides with the spring force and hits the stem. When the driving gear reengages with the rack to pull it back and get ready for the next hit, there is a problem in meshing, the two teeth's top faces can hit each other and damage itself.
Is there any way to ensure proper engagement as the rack can be anywhere when the pinion engages?
Some design constraints:
1. Very limited space
2. One motor drives everything
3. no space on both sides of the gear.
4. No heavy loads (<2kg)
5. Motor rpm will be around 60rpm
Gear A drives gear B or vice versa. Both these gears drive 2 racks on either side of the gears. These racks are the beating arm which is spring-loaded. Do not mind the sprigs ends, it only for showing the spring position. The dimensions of the outer boundary are close to 220mm x 120mm




Is there any way to ensure proper engagement as the rack can be anywhere when the pinion engages?
Some design constraints:
1. Very limited space
2. One motor drives everything
3. no space on both sides of the gear.
4. No heavy loads (<2kg)
5. Motor rpm will be around 60rpm
Gear A drives gear B or vice versa. Both these gears drive 2 racks on either side of the gears. These racks are the beating arm which is spring-loaded. Do not mind the sprigs ends, it only for showing the spring position. The dimensions of the outer boundary are close to 220mm x 120mm





RE: Compound gear meshing trouble with rack
RE: Compound gear meshing trouble with rack
Check the link: https://robomechjournal.springeropen.com/articles/...
The problem with switch on and off the motor is that the energy consumption will be high. I asked this to a electronics guy about this. The starting power is higher. The mechanism needs to continuously run for 3 minutes in one go which would drain the battery. Cutting the power was a great idea but the mechanism has a default open position. I use a worm gear motor to stop lock the mechanism when the power cuts off. The worm gear motor cannot rotate back under spring tension.
RE: Compound gear meshing trouble with rack
it seems to me also some type of clutch to engage and disengage.
to allow it to free wheel.
or maybe use a crank style mechanism.
RE: Compound gear meshing trouble with rack
RE: Compound gear meshing trouble with rack
I don't understand why this book is free on the internet, but there it is. Even a printed copy is available for very little money, $15-$30. This is an astounding bargain, which you will see if you didn't know about that book.
Nick Chironis got it going back in the 1960s. He is no longer with us. Maybe he wouldn't mind that this book is free to all. He was that kind of guy.
RE: Compound gear meshing trouble with rack
RE: Compound gear meshing trouble with rack