Getting started with a 2dof rig

Hello everyone.
Iv been reading up a lot on here over the last few months wanting to build my own motion simulator.

I want 2dof, roll and pitch.

But to start with I'm going to just build the roll and add pitch later. As I know how I'm going to do that.

So My plan for roll is to build the rig out of extruded aluminium so I can bolt it together with t nuts.

I plan to make the cockpit chassis rotate around as close to center mass as possible. So probably rotate around my butt area.

Now I know this is not normally how it's done, but I want more rotation than the rigs IV seen.

I also run vr so the whole point of this is for emersion. I am thinking I would like about 90 degrees of rotation, so 45 degrees both left and right. Should give me quite a bit of simulated g force.

However I am unsure if this idea is feasible. I can think of some issues.

Since I'm planing to rotate around center mass as much as possible, weight won't be an issue in terms of the force load been different at different angles. but I can imagine inertia will be. Maybe difficult to start moving or more worrying me is stopping at the correct angle (I can image it been a bit bouncy when stopping)

I was thinking of getting a high rpm motor with decent force and gearing up about 8 to 1.

So my question is this would this idea work? I have no experience in this area. Most iv done is rumble motors and DIY base shakers.

Thank you so much.
Matt

Ok I was wondering about that.
I just worked out that I could do 45 degrees of travel in around 50ms which is probably to long. I'll have a rethink.

Iv been trying to find a good place to get hall effects sensors, iv found some on Amazon for around £20 is that price average? Or is there a good place to get them.

I'm also planning to uses 2 old scooter motor that I have

First off thank you for the help so far to my questions and this amazing forum!

So my dad had an VW front wiper washer.
Quick test showed its powerful, so going to start testing with it and see if it has enough power or not.
Did some very quick test and its about 60rpm and over 300w at stall.

Need to upgrade my rid first as my current rig is wood, and will be to heavy,
Going for extruded aluminium 40x40 with T slots,
Will cost me about £120 in parts

Going to start with a 12v 40amp power supply, and put 20amp fuses for each motor to avoid blowing the PSU. I know if I run my motors to stall it will blow the fuse, but for now I'm making sure my parts are going to work. Then ill be getting my second PSU if the one I have is good enough quality.

Ill be using 40amp h-bridge driver for each motor and using
SMC3 Arduino 3DOF Motor Driver
in mode 2 with the h-bridge driver.

Then going to find the centre of mass of my rig and install a ball joint there.
I'm going to mount the rig off the ground at the same distance as the motors in neutral position to give me the most range even if I don't use it.

Iv worked out that with the motor I have should have about 8 degrees of motion for breaking and acceleration. so 4 degrees each way.

I have a few questions.

Would the above rotation be enough in VR? 8 degrees forward and back, roll rotation can be more on my rig worked it out to about 30 degrees 15 each side.​

Is there anything else I will need?

• So far I have accounted for aluminium rig.
• 2x motors
• 2x h-bridge drivers
• Arduino
• 10 gauge wire
• 480w PSU (getting second one in the future)
• ball joint for centre of mass of rig.
• parts to attach motors to rig for rotation
• cooling as required for ether motors, PSU and h-bridge driver
• software
• 2x hall effects sensors / potentiometers.

Can you spot anything potential problems with my plans
​

Thanks again Matt