Hi Matt,

I am currently a final year student studying in Singapore, Nanyang Technological University. Have embarked on my final year project (FYP): Legged robotic platform for terrain survey.

I've seeked advice on lynxmotion(http://lynxmotion.net/viewtopic.php?t=2725&postdays=0&postorder=asc&start=0)
, and have received numerous replies and ideas. As i've build a quad but am having problems in the femur section, wondering if you could kindly send me a CAD file (autocadd/ solidworks) as reference?

I will acknowledge all reference in my FYP report/Thesis.

Cheers
Zack AKA ZeRoCoOl (nokia6100_00@hotmail.com)

Hi Zack,

What problems are you having with the femur section?

Matt.

If you can take a look at my current design: http://s31.photobucket.com/albums/c391/ZeRoC00l/FYP/?action=view&current=IMAGE_00025-1.jpg

The joint between the hip (inverted servo) and femur(horizontal) is under alot of stress. i've noticed a fair amount of flex as all the forces are on the servo axle even without my 5 X AA battery pack. So i'm quite concern of the load bearing once I start adding a pan/tilt, my camera, my RF communications and there are plans for a gripper if time permits

So I was thinking of making use of your V4b design as (1) it would give a large mid body to store my battery as well as some sensors; (2) It is strong; (3) simple design (achievable with 3-5mm acrylic) as I've only got access to limited CNC facilities.

I've got a seriously loading issue as i bought the wrong femur servo (HS422 instead of HS475).. so i'm looking for ways to lighten the overall chassis and still retain it's strength

Cheers
Zack

Now I'm looking at the controller: p.Brain that you've developed, or the Servo Control : Rx03-50i Servo boards to drive the servos

Are they for sale? If yes, may I know how much it goes for?

I made a servo control from a PIC 18F252 chip, but am facing the problem of controlling them to have terrain adaptation ability.

I'm not sure is it due to the long computation time or something else, but I get a leg in a wrong position once in a while or have a total power loss to a servo, and the quad topples over

Cheers

Hi Zack,

I'm currently finsishing a release version of the p.Brain, I'm not sure how much this will be yet. The Rx03-60i I no longer make.

I used the PIC18F252 for my first encarnation of the p.Brain, however, there are some major silicon problems with this chip and I would suggest you swap it for the PIC18F2520 which is its replacment. I chased down an eratic bug for ages on the old 252 only to find out I was chasing my tail!!

Matt.

Hi Zack,

I'm currently finsishing a release version of the p.Brain, I'm not sure how much this will be yet. The Rx03-60i I no longer make.

I used the PIC18F252 for my first encarnation of the p.Brain, however, there are some major silicon problems with this chip and I would suggest you swap it for the PIC18F2520 which is its replacment. I chased down an eratic bug for ages on the old 252 only to find out I was chasing my tail!!

Matt.

--- mdenton 

Thanks mate!

I've been getting a lot of problems and I couldn't fingue it out.

Am on the verge of giving up and buying a commercial servo controller unit so I can proceed with my project. Have already spend 4mths and progress is REALLY slow..

Am eagerly waiting for your P.brain engine!

Am eagerly waiting for your P.brain engine!

--- Zack 

Take a look at the new topic I have just started.

M@