Hey guys 
If anyone has one of these add-on decks, could you let me know what the dimensions are? Ive been trying to figure it out from the photo, but i just cant tell its diameter/height accurately enough.
Thank you
Probably 8.5" in diameter, to match the body of the AH3-R 'bot?
Maybe you can find the drawing of the body, someone can measure their body.
Alan KM6VV
Well, from this picture, its mostly the top deck that im concerned with (as Im planning a torso to fit on top of the add-on deck)
I would assume that the bottom part would, indeed, be the same as the body of the CH3-R.
The bottom deck is not the same diameter as the body. I guess it is designed to fit the inner ring of holes on the body. I ordered one the other day so I’ll let you know if nobody has by the time it arrives.
Ah i see, thank you snarez.
Do you know, which bracket would be best if i were to put a servo attached to the addon deck, connect it to said bracket, then connect another servo to that bracket in order to give turret motion? (pan and tilt i think)
basically, i want to use the addon deck to create a top half that rotates left and right, and tilts up and down.
I see the top deck is smaller.
Print out pix, use a scale (ruler) to measure horizontally across both the body and the top deck. You should be able to calculate the diameter of the top deck.
What accuracy do you require? What will you do with it?
Alan KM6VV
Toshi I’m about to do something very similar. The top section of the add-on deck has a hole cut for a servo so you can mount a pan or pan/tilt assembly (pan with 2 ultrasonic sensors in that pic above by the looks). If you’re intending to mount something light on the pan/tilt I’m sure you could get away with using one of the regular pan/tilt assemblies with the bottom servo mounted in that hole. What I’m mounting might be a bit heavy for that so I ordered the base rotate and am hoping it will mount OK on the bottom half of the add-on deck without too much hacking.
innerbreed pointed out in this thread that Jim had mounted a base rotate directly onto a H3-R body before.
Well, I had a look at it like you said, and it appears (if the view hasnt distorted the proportions too much) that:
Top Disc = 3.9" diameter
Mid Disc = 6.5" diameter
Base Disc = 8.5" diameter
The reason i would like to know for sure, is that im organising 3D printing of cylinders the approximate diameter and width of those decks, so as i can enclose them into the hull of the robot, kinda like armor. But i dont want to print them the wrong size. I could of course, just wait for it to arrive, but im impatient and designing things to print before I get the pieces they are designed for 
Hehe awesome. Where are you having them printed?
Hey snarez, thanks for those links! They will be helpful.
Im not sure of the final weight of the top half, but since it is intended to support at least 2 BB cannons, it will probably be easier to go for the base rotate kit. Since that can hold 5kg, i think it will be more than sufficient. On top of the base rotate kit, it will be possible to add a servo bracket im guessing? To give it tilt? How would you get wires from above the base rotate kit through to a board underneath the base rotate kit? (as it doesnt look like you could feed them through the middle)
Another, unrelated question, what is the benefit of replacing the plastic servo horns with metal ones?
Im getting my stuff printed through Shapeways, the free shipping they have is very good for me all the way over here in New Zealand.
By the way, the johnny 5/hexapod looks very cool.
By the looks I’d say you could attach the multipurpose bracket to the base rotate kit, and the tilt servo on top of that. Not sure about the rest but I’m sure we’ll figure it out 
Shapeways looks cool. I’m in Australia so that would probably be helpful for me too.
If your not so great on the ol’ 3D modelling software (like me) they also do a handy “image popper” service, just make a 2D jpg in paint and they extend it out 3D. Useful for certain parts, ive found.
Hmm multipurpose bracket aye. Ive got to figure out some way of attaching the pipe and shell torso kit im building to a base on top of the tilting servo, without it resting too much all on one point. This would be a lot easier if my CH3R was here, but thats at least another week away 
That’s pretty neat. I just started getting into SolidWorks. Creating basic stuff is pretty easy once you’ve done a few tutorials.
Yeah, the multi-purpose bracket is the part that attaches the two servos together in the tilt/pan assembly. It’ll make a lot more sense once you put the CH3-R together, there’s a pair of them making up each hip joint.
Ah yes, im just getting solidworks now actually, ive tried maya, lightwave, google sketchup, they are all difficult to learn and export files in totally different formats, making it really difficult to get everything the way i want it.
I am getting better at it though, waiting for my first batch of items to arrive from shapeways next week.
Those brackets look good, ill have to get some of them when i assemble the torso servo mechanism.
Sorry for all the trouble, this should be on the website… The larger disk is 6.5" and the smaller one is 3.875". The HBKR base has holes for the injection molded base rotate.
Thanks for the clarification Jim.