Formula 3 simulator :)

Thank you for the suggestions.

I am using the ibt-2

It has a output for the built in protection so i will wire up some leds and see if they get activated

The battery idea is a good one i will wire up 2x12v for safety.

I decided to try out the new ibt-4 which uses 2x pwm and a ground to trigger it. I am unable to work out if it is powered by the 'motor in' power and will find out when they arrive. I suspect i may not be able to use them because they will not go to 24v

If you have the spare cash and want to stop experimenting, I and others could recommend the Sabertooth drivers (go the 2 X 60 if the budget allows) - One of them will do both motors and they are actually made for this type of application.

looks like a nice unit - but out of budget for the time being

i will try the ibt-4 that i have ordered should be ok for 50A

if this is not up to the job i guess i can try 2 x ibt-2 per motor and get 86 A

interestingly the motors i have are quite low amps (8A iirc)

this looks like a bargain - http://www.ebay.co.uk/itm/100-A-Hig...820575&hash=item2a5cf178a3:g:md4AAOSw8-tWXXmN

has anyone tried one ?

It's not the base current that causes the issues, it's the high regenerative voltages/currents produced by the motor when the motor changes direction often and at high speeds. If a driver/power supply is not designed for this - then it will just shut down.

This is so very true... Even when i have low power motors on my rig, i get shutdowns with unmanned seat while testing rapid move changes with smcutil or so.

It is nice if you can afford testing new drivers... I'm happy with IBT-2's over MM's, which were just disaster (china copys). Those IBT-3 / IBT-4's over ebay seems a bit suspicious... Hope you get valid stuff !!

it appears one motor is causing the problem and in only one direction - i have leds wired up to the shutdown triggers - i wonder if i have a bad motor, or a bad ibt-2 - could the motor have bad brushes for example

(the motors are rated at 8a continuous)

the ibt-4 arrived today but they are not suitable for 24v

i have ordered another pair of ibt-2 and plan to run them as pairs wired together

i will feedback how i get on

i added a cooling fan to the ibt-2 motor drivers today

so far the motors have not shut down

i have a bit of twist in the front of the sim when loaded up with a heavy person

the UV joint is from steering column and is probably not strong enough

I can either source a UV from a prop shaft, or fit a panhard bar

do i need 2 bars on each side or one bar on the rear ?

does anyone have any examples i can look at

thanks @noorbeast - that looks simple enough

will the pan hard bar not cause it to twist right when the nose dips and twist left when it rises ?

do i need the angle between the left and right ends to be as shallow as possible

I will get something knocked up asap and try it out

useful article here

the panhard bar needs to be as long and flat as possible


http://www.turnology.com/tech-stori...ences-between-a-panhard-bar-and-a-watts-link/

Some pics of the panhard bar as requested

It needs to be flat and level with the pivot axis

It seems to have done the trick

@Gadget999 - looks like you answered your question about Panhard bars actually introducing some twist in the rig while they lock out much more twist. Yup! I had to add them too with a steering U-joint where the mounting didn’t have quite enough resistance to the sim twisting.

Very nice looking rig!

hope to get the DC DD wheel fitted soon and get it working again, i found an old projector that looks perfect to use on the wall.

That looks so cool to actually be seated in a real race cockpit. Congratulations