Linear actuator using ClearPath Integrated Servo System @ 72V DC

The maximum lift capacity? That depends on how you define "maximum"

With the 1620 ballscrews I can easily lift a 150Kg payload and move it around pretty swiftly. That's the kind of setup I have planned for.
I can even lift ~300Kg as long as I tune the motioin to be rather smooth. Using it for an airliner-sim might be possible this way.
I haven't tested it, but I guess that ~400Kgs is definitely the end of the road for this setup. I think that the motors would simply stall as soon as you demand any movement from them.

Also, be aware that the geometry of the rig will have a significant effect on lifting capacity:

• The smaller the diameters of the rig (upper and lower) in relation to the actuators over-all-length, the more lifting capacity you get (actuators are steep), but you pay for it with a reduced operating space in heave.

• The larger the diameter of the rig in relation to the actuators over-all-length(and thereby very shallow actuators) the less weight you can lift, but you get an increased operating space in heave.

I know that this is somewhat counter-intuitive, but worth understanding before deciding on the rig geometry. @Erik Middeldorp made a super nice excel sheet to calculate the forces on a 6DOF rig here.

Cheers,.... Dirty

What do people think of the 110ST-M04030 motor? I see one vendor on AliExpress with it for $1400 delivered to the US for six of them. That is a lower price than I have seen for smaller motors from other vendors.

Goal is to do helicopter sim - plan would be 2020 screws with gearing around 26T on motor and 32T on screw. That would be 812 mm/sec and 2.35G. Should I want to skew it more toward even more speed and fewer G?

Screws would be 650mm with 550mm travel. Is that a good amount of travel? Or perhaps I should get 700mm screw? Welcome any advice as I only know what I have been reading for a few days.

That is indeed a good price for 6 x 1.2KW servos. Maybe the 110mm form factor is in less demand than the 80mm form factor? It is afterall almost twice the volume. Unless you are constrained by the size of the motors (why would you?), I see no reason not to use those.

~800mm/s is a lot. Just imagine (or calculate!) the acceleration and deceleration you'd need for those to even reach their max speed within the 650mm travel. Using the foldback design with a belt drive is in my opinion the way to go. It shortens the actuator significantly and it allows for some design flexibilty by simply changing out the gear ratio of the belt drive. 3000RPM with a 26:32 reduction sounds reasonable.
I know it is tempting to extend the actuators, because the price increase from 550mm stroke to 750mm stroke isn't all that much, but if you want to put the sim into a normal room in a normal house, you will at some point run your head into the ceiling :-D
Also, buckling loads grow quadratically, meaning the increase from 550mm to 750mm will almost double the buckling load at max extension that you will have to worry about. I settled for ~620mm stroke and am more than happy with it

And don't forget to start a build thread! I am constantly baffled how many people build a motion sim without ever starting a proper build thread on here

Cheers

does it come with drivers - are they the correct type ?

I didn't mean to consider going from 550mm stroke to 750mm stroke. I mean perhaps when I order the first ballscrew to refine the design I should start with a 750 instead of a 650 so that I have some extra in case I want to go above 550mm of actual travel. Good point about ceiling height.

I don't know if it comes with drivers of the correct type.

I messaged them if they have a ST90-4025 and they said no because they have a new servo system. So the question is - would this have the right driver compatibility? It is under $1000 USD for 6 of them and it is 1 kW per motor:

https://www.aliexpress.us/item/3256...804156161!im!!&gatewayAdapt=glo2usa4itemAdapt

Here is the manual for the driver - what are the odds it will work?

https://book.yunzhan365.com/qaiwu/iprw/mobile/index.html

I am not very familiar with the different types of servo drives and what makes them compatible.
Maybe @Motion4Sim can say whether those drives are compatible with his controller.

I messaged two days ago on their support Telegram that has four members, and the message was read, but no response yet.

Hello, we've already been in contact on Telegram and I've answered all your questions. Here's a brief addition: All servo drivers compatible with Puls-Dir work in some way with our controller. The question is whether all signals are supported. The main issue is often that the cables need to be assembled by oneself to get things moving accordingly. Programming also needs to be examined in detail. But as I said, everything with Puls-Dir somehow works. sorry for delay

Yes, thank you for the help. While I can handle making a custom cable, people pointed out that these drivers tend to be noisy. I will take their word for it and stick with the AASD.