Hello, thankyou for participating in the community. I need a bit more information about your application. generally speaking a high torque servo in a gearbox, or making a custom servo from a large gear motor and kangaroo controller can be used as well.

Well, that's about 833 oz/in torque. Pretty impressive for a $40(ish) servo. Another more expensive option would be to put a servo into a gearbox. ServoCity has some very impressive assorted styles or gearbox/servo combinations. You can choose from surface, channel or tube mounted gearboxes. They come with or without feedback and different turn radiuses. Truly a wonderful and amazing product. The right setup with a standard size servo could get you a Maximum torque of 3304oz-in and minimum transit time of .28sec/60° or more. Here ya go: ServoCity Gear Boxes and Servos

Thanks for your message

you asked for more information:

My hobby is building all types of mechanical objects including robots based on the EX robot controller. I am not an electronic person thus EZ controller suits me. Thus, my question, aimed at making sure I do not damage the controller and can use a second power source for the large servo ,using a gear train to give max load etc. The large servo is part of a robot arm and leg parts, on top of a large hexapod. The design stands about 20+inchs tall and is mostly made from 3D printed parts OR laser cut parts

Hope this helps

Back again, following up on your ideas, could this type of powerfully servo be controlled and power via the ez controller. See picture

thanks all paul

I have those high torque servos (above picture)... they work very well with the ezb4... You just need to power the servo separately with between 12 and 24v... Other than that they just plug into the ezb4 (and are controlled) like any other hobby servo...

I just placed an order from China for these but they are even stronger versions, 380kg/cm. My question to you Richard,how loud are they?

This thread was very informative and helpful for me. I am looking at using ASMC-40 servo myself by integrating them into the shoulders and elbows of my Omnibot 2000. I wanted the arms of my Omnibot a little longer, so I was going to model and 3d print new ones out of ABS. Using the ASMC servos is what I had in mind.

I found the servos for $28 on the following online retailer:

http://www.demesstore.top/index.php?main_page=product_info&products_id=16238