Probably back of a napkin stuff for you, but it's been a while since I've had to work out anything like this, and rather a lot of other crap has filled my brain since. Plus I have a screaming baby in my ear today.
However, just to check I'm not going crazy here: I need to move 1000N, 48...
I'm confused now (easily done)
I thought radial force is applied in the direction of rotation, and axial force would separate the pinion from the rack? But there's little axial force if I use straight-cut teeth.
I'd toyed with the idea early on. But there's not really enough space to get a motor and drive to a jackscrew, certainly not without adding a lot of weight and complexity. I'd put a motor by the passenger's feet, which connected to a jackscrew via a driveshaft, but it needed universal joints and...
I was just going to use an Arduino for the prototypes, and a basic rack mount supply
but one of these will run three at once http://uk.rs-online.com/web/p/products/4184045/?grossPrice=Y
Thanks BrianE22 - could I get the same watts per kg with a brushed motor? I also like the low electrical noise and low maintenance aspect of brushless, since this is for an aviation seat.
A controller solution can be had for less than 10% of the cost of the motor, so it's not a massive...
To be honest, I can't remember exactly.
Though using this (ignoring friction coefficients) I get just under 300Nm. https://servotak.eu/tools/engineering_calculator (radial force on pinion)
If I include a reasonable friction coefficient of 0.8, I get a radial force on pinion of 500N.
System...
thanks imcjoek - if someone's got some maths wrong, it's almost certainly me.
The pinion will only be small - probably more like 3cm diameter, rather than 25, with a small gear pitch.
How does torque on a rack and pinion setup translate to vertical force? because 24,000Nm of torque sounds...
hi folks,
I've been trying to spec a motor for a seat project I'm working on.
It needs to move a 100kg person up and down at 45 degrees by about 400mm. The actuation would be via a toothed rack cut into one of the motion guides, so I've estimated i'd need a pinion with about 300 Nm...
Hi everyone,
I'm working on a seat design that uses 10cm (O.D) aluminium tubes as supports, to which my main seat structure is clamped.
There are an increasing number of carbon fibre alternatives available now and I was wonder how one would approach mounting to these instead. I presume...
thanks for the replies.
I can't use a car seat motor because they are not powerful enough, and are too heavy. They usually rely on a jackscrew or similar, which is not an option for my design.
Maxon motor's products are often used by airlines but it looks like I'm going to have to design a...
Hi everyone,
I'm trying to find a suitable solution for the actuation of an airline seat prototype.
The seat will be moved by a rack and pinion set up and a single stage of gearing.
I need between 60 and 80 rpm at the motor/drive output and at least 70 Nm of torque.
The...
