The simplest, although possibly not the least expensive is to just remove the wheelchair electronics (except possibly the battery charger) and connect the motors to a Sabertooth 2x25 (or similar) H-Bridge.  Most wheelchair motor conversions use this method.  It is possible to tap into the joystick controls and send the correct signal controls to the existing controller, but none of hte wheelchair companies document them, and each one is a little different, so it would take a lot of experimentation.  (I have also seen someone just hook up servos to the joystick.  Seems a bit cludgy to me, but works I guess).

Alan

So a Sabertooth sounds like something to look at then I can decide what type of motors will work as I am just using the smaller H bridges right now for 6 volt motors . Looking at Kijiji for listings of used wheel chairs and heading out to the huge Flee market we have here this Afternoon to see what I can find as there are also many Hobby venders with great deals on all sorts of stuff and possibly an old wheel chair ,you never know til you look. Another thing I may find is a child's electric car that they can sit in and drive outside. These have some really powerful high torque electric motors too. I have a bunch of arms and hands from old Robosapien V2 and Media bots that have fingers almost as large as human to modify for Endo skeleton arms, just need newer servos for those. They work the hands using a wire pulley system all the way to the fingers. As long as the drum sticks can be held on they will work great. My brother is going to work on the chest and back plate adding modified shock absorbers to give it the wide shoulders and waist movements...This is going to be a Fun project, Thanks again Alan.

Yeah, Wheelchair motors are overkill for a lot of robots.   They can carry 300 lbs at a good speed.  The Power wheels car motors are much smaller and have fear boxes, and can easily move a 50-80 lb bot.  I have a couple of the motors, but am looking for wheels for them right (the gearbox axle is kind of strange.  Will take some work if I want something other than  wheels from the same toy)

Windshield Wiper and car door window lifters are also good choices for smaller but still powerful bots.

Ah yes, the classic wind shield motor mod, I have seen this used in other robotics Forums, Classic!

Yessss! I did find the perfect wheel platform for the T-800 ! The kiddy electric ride in cars really have come  far in tech since I was a kid. Not just a single battery and motor,talking about a kids version of a Lambo with dual  heavy duty 12 volt motors,yes 2. Also 2 12 volt batteries with a convenient recharging port! Plenty of extra wiring inside and even high performing head light system....Wish I was a 5 year old!  The power lasts something like 4 hours if a kid inside but if just a robot and plastic body removed could last way longer! great price brand new in the box!

Following some example programs on this forum from some members like the one with the Laser turret and target overlay, there are some great creative robot enthusiastic people here! Giving me some ideas for the Terminator while I wait for a month before the chrome head and neck gets to Canada by the slowest shipping method, LOL! I would have to say that buying the EZB camera just before Christmas was my greatest online purchase all year in 2018. I had no idea what amazing things could be done with this cam, and so easy to apply the programming with the wealth of videos provided by DJ and the EZ team. Does anyone know if it would be Illegal to have the Terminator bot wielding an actual replica of an Israel Army Mini Uzi? I bought online a few years ago and it is made to the exact specs and materials used to build the actual 9MM bullet Uzi's. In terminator 1 Arnold does use this to blow away many umm Cops I think. Mine is just a copper BB version that uses compressed Co2 to fire. but if I just use empty BB clip and have the robot fire it, it makes the exact same sound as a real mini Uzi cycling at 950 cycles per minute. On a stage this could look very real and dangerous but sure would add to the realism of a theatrical Terminator! Like, if I paint the tip of the gun orange just like on all Airsoft BB rifles, it should be legal right? I do have also a Wal-Mart M4 airsoft machine gun but looks totally fake due to the see through plastic and it is much longer, not practical for a robot really. Although I did modify it to shoot much faster by using the 11.1 Lipo instead of the 7.4 battery it came with. The M4 also has a built in L.E.D. to shine light on the 300 round glow in the Dark green BB's so it looks just like real bullet fire tracer rounds. Great for Airsoft battles with friends outside but not for shooting on a Music-band stage in a bar, LOL!!It could take an eye out as the 11.1 Lipo proved it could blow holes right through my ceiling! Well anyway ,the EZ cam used to identify human faces, colors and shapes is going to be fun to use to target my guitar player on stage, ahhh still early ,let us see when it is ready!

Well, I do know that EZ Robot inc. does not like their products, or robots in general, to be used in any type of anarchy, mayhem or world dominating plot. With that said you could build your uber robotic BB gun and post it outside at night to patrol and guard your garbage cans against rouge raccoons.  :'(

:DAha ha ya the Racoon thing I did already, caught some funny night vision stuff when the Racoon was trying to break in to the cottage every night through the screen window on the porch,it was smart and knew how to break in and open the refrigerator door we had there. The BB gun did target the little guy and eventually he stopped trying it... I guess I could just have the robot have the Uzi in a Holster and mainly wave the drum sticks and have the beating motion using the sound servo settings,there are actually some interesting arm movements that can be added to a script using the Recorder option too.Fascinating the more I look into these servo settings. As I was looking at buying a Lidar navigating sensor I discovered what would be a great add on camera to go along with EZ-cam. This is way cheaper than the other Thermal cams that came out last year. The 33 version of it is ideal for Robot vision( longer range than the 90 and better detail) to detect humans or animals outside even in sunlight  or total darkness..Think of the Westworld Gunslinger tracking a human in the old 70's movie,this is now reality!Will be perfect for a Terminator bot outdoors looking for people to interact with....https://www.youtube.com/watch?time_continue=140&v=Q6coj7Ca_aM