Konterror's 2 DOF Seatmover Project

You need to take the trash out and clean that damn bench off then you can play with your tubing.

The push rods look like this:

This is aluminum tubeing with a M8 thread cut in.
The wooden motor mounts were first just to have a model for steel ones:



It looked like this moving (My father and I used a batterie to move the motor):


After this we figured out the motor needs a mountpoint a little lower and the levers need to be a bit shorter.
We went away from the steel mount idea and will use wood instead. It looks like this now:



There will be a wooden plate connecting both mounts to make it more rigid. The pots are mounted on too, but I have no pics right now.

In case everything goes as planned the simulator will be running this week. The "make it look good point will be postponed though I will post another update soon.

To put the ToDo list back in:
put everything together -> (electronics missing)
make it look good

hi,

Very robust structure, may be oversized?

Why not put aluminum profiles 40x40 or 45x45 gold?
80x80 is a lot right?

whats the centre to centre length of those levers?

Levers look to be way too long for the motors to handle. and your connecting bars are way too vertical (sorry if not, but photos show very little lean on them) , meaning the motors will have to work even harder to control the movements.

These are things that we have learnt over the years and have watch new people make the same mistake over and over again, we try to help but what do we know after several builds and years of advising. lol.

Plus only advising , Have you isolated the earth from the wiper body ?

If not this has the potential to fry anything connected to the sim via its earth , eg. Steering wheel and pedals if bolted to frame, controllers , the pots as the earth is a body earth on cheap pots and some expensive ones too, the end result is 12V running through the earth of the wiper , too make the motor go in reverse, then goes to earth of pot and the earth is connected back to the common earthing found in all controllers and then this feeds 12v back down your earth on your usb port and frys the motherboard of the pc. This I have done personally, hence I ask and advise people this CAN HAPPEN !!!.

We only give advice to help people to not make the same mistake over and over again, if they listen cool, if not well you can not lead a dying horse to water, and expect he will drink it and live. ROFL

@Baptx , thats ok you rated this post "dumb" . Once you have built 14 different design sims, sold 4 and have 2 as hire out machines, and have had over 100 people play on them over the years , then you are welcome to advise further.

Those pushrods. Where does one get aluminium tubing like that?

It's just that I haven't quite seen one like this one with a frame structure within it. Looks interesting.....

Thanks for your input!
I got the tubing here: http://www.motedis.com/shop/Tube-sy...e-with-core-aluminium-anodized-28mm::824.html

@bsft Center to center lever length is 130mm right now.
@eaorobbie I have not done that, yet. You just made me think I should (I hope I find that tutorial again)
@Baptx most of the frame is 40x40. Some parts are 40x80 and 40x160 though. And you are right, the 40x80 I used on the seat is too much. Next time I would 40x40 there.

@noorbeast / @bsft The seat is pretty balanced in the 0 position and has to move roughly 95kg including me and the seat construction.
I would shorten the levers to 80mm first. Do you think that would work?

@noorbeast Thanks! I forgot to mention that in my reply
I will leave the motors where they are front to back but shorten the levers 50mm. that will angle them less steep.
Moving the motors to the outside might be a little trickey because there is a kind of a limited range of motion in the joint heads. I will experiment a little with the motor placement to find the best compromise before I cut the front wooden plate.

50mm CTC lever should be ok.
Probably a stupid question, what are the motors you are using, they look like big wiper motors?
Whats the rated RPM at the shaft?

@bsft Those are big wiper motors. They have are supposed to have 80 Watt. I counted 50 RPM in the Slower mode and 75 in the faster mode.
In the table are the part numbers and manufacturers. Maybe you find more Info there, but as far as I remember those info where somwhat scarce.

OE-NummerHersteller
800014Alanko
0390341403Bosch
10921743SWAG
1408200008Mercedes

First of all I isolated earth on the wiper motors. Thanks again to @eaorobbie I would have probaly fried somthing in the near future

Yesterday I put everything together and used 100mm CTC to begin with and went on with 80mm. With the shorter levers the seat moved faster. I would have tried 60mm or shorter, but with that lever lenght I need to get diffrent motor mounts. The wooden mounts restrict the lever movement because of the needed thickness.

The one motor looked great and was able to move the seat with someone sitting in it with ease. The JRK diagrams did not look too bad I think.
The other motor jitterd on the movement and was a lot slower. The JRK settings were the same. Might be a carbon brush not lying correctly on the anchor (I hope the technical words are understandable) or something else... Someone with an idea?

@noorbeast you are right with the motor mounts. Once I get the second motor running smooth, and have new mounts I will try it with 80mm and 50mm. I am a little hesitant to cut them down to 50mm right away, since I need to make new levers once they are too short (thats two to three hours with my tools).

You think its not a physical problem but something with PID settings that makes the motor jitter?
Right now I use the settings you recommend to start with in the tutorial. Do you have advise what to change in the PID to get the jittering under control? (I have not read much about PID yet and have pretty much no clue)?

Most of us run 200 watt motors on the JRKS no problems, and with gearbox ratios of 25:1 or 60:1 , with a 40mm CTC lever and the right settings that would equate to about 300mm per second and 130mm per second speed. Give or take.
50 rpm motor and 80 watt is standard wiper . What I began with and have since moved on.