Motors question

Hello,

If I was to calculate the amount of force needed to move the platform within its specified motion which is 18 degrees, is there some kind of calculation that i can do that will tell me what force would be required to move that weight on the end of a crank arm of a specific length?

Hope this makes sense lol I am no good at explaining

many thanks

mitch

Hi Mitch,
My friend owns a Motor Repair Center here. When I first started out looking for motors/gearheads couple years ago, he looked at my data and advised me what I needed.

The CKAS used 3/4 hp inverter duty motors with 60:1 ratio on the included gearhead. The torque was 68 ft. lbs per motor. - I don't know the weight of the top platform on the CKAS, but their
2DOF only moved a total of 8 degrees - 4 up / 4 down.

With my computed top platform weight, with occupant, is 425 lbs. My motors are 1hp inverter duty, my gearheads are 60:1, BUT their output torque are 117 ft.bls. EACH -
I have been told that my choice was "overkill" and one advised that I could probably lift a Volkswagen with them???

I'm going to use 4" center to center crankarms - My rod ends and all 3 motor/gearheads with be 16.5" away from cent of lower platform spline pipe...........my degrees of movement calculated "here"
by several of the "heavy-weight" builders - IS +- 14.3 degrees.... OF course, I can adjust the amount that I want in the software profile.

For me, I'm real happy with what I have in way of hardware - and it may be overkill - but I would rather have too much than too little - AGAIN, I want to do both flight sim and racing.

This may not of helped much - but I'm sure the same fellows that helped me here will advise you also.

Have a blessed one.

Tom

depends if the platform is balanced or you are using sheer lift.
If its balanced, 12v big worm gear with 50:1 or 60:1 box will do it. Just make the lever long enough to allow that sort of angle, measure from pivot to motor point to work out the lever length needed for the angle.

Hi bsft, my platform is 2 person so the weight cannot completely be balanced over the central point. Thanks for your answer though.

Do the motors we buy have to be braked??

Thanks

If you need to lift 2 people and do not have balance, use 240v

Hi Bsft, yep that was the plan all along as I didnt think the DC motors could handle the weights, here is my build thread. Its a 2DOF system but we have to start somewhere!!

http://www.xsimulator.net/community/threads/2dof-ac-project.5150/

Hi fellows,
As stated, I'm happy with my AC hardware and I do know it will work with my platform - Heavy duty AC for you Mitch - as you stated that you're not in balance with two occupants - so your motors/gearheads will
have to do a lot of heavy lifting - Thankfully, mine is balanced and should just "rock"...
I do know the AC platforms are NOT the rave review here - but I'm convinced that all my helpful friends, RIGHT HERE, can just make my platform GREAT - nothing compared to the CKAS.

Have a blessed one,

Tom