Lynxmotion Tech Support

Yes, 8 is the total count. I forgot to include the gripper one. I was wondering if I could replace the standard round base which comes with AL5d with this "http://www.servocity.com/html/spg7950a-bm_standard_rotation.html". Should that be okay? Actually the objective is to mount the arm to a vertical surface (just like a human arm connected to a side of torso) and not on the floor. So, i think the round plastic base would not serve this purpose. What you guys suggest for this "servo city pan rotation" system?

Your suggestion about the dual servo brackets seems promising but I really have no experience in building robot using brackets before so I am a quite worried about experimentation in the design phase (I just want a 6DOF design with the highest possible torque servos). Maybe that's why I want to remain as closer to this configuration as possible. The only modification I am planning to do is to use a dual servo standard bracket at the elbow joint just like the base joint to house 2 servos for extra support (so there would be a pair of 2-servos supporting the base joint and the elbow joint). The rest configuration should remain the same. In this way the total servo count would be 9.

There are no budget constraints from the school side. That's why I am more concerned about the weight lifting capability of the arm. The haste in placing an order is not due to time constraints but I want to spend more time on using it (Ik and programming) rather designing and building it and therefore opinions from the experts here are highly requested for an optimum 6DOF design. I had almost finalized the crustcrawler AX-18A because of its plug&play rugged design for 6DOF but realizing that the hardware does not fit r/c servos made me drop-out that option. Now, I am looking forward to an exciting design from lynxmotion.

Please advise me about the "servo city pan system" to use as the base.
Thanks

I'm sorry, but at this point you are getting way beyond my knowledge and experience. I had good luck building and running one of their stock kits straight "out of the box" so to speak. The only "modification" was that I was allowed to choose what type of board to mount the base onto.

Any guess I could make about mounting Lynxmotion parts on that ServoCity base would very likely be wrong. Perhaps someone else here can give you a more educated guess.

One last thought: If you or someone at school has access to a CAD program like SolidWorks, you can download CAD models of most SES parts here http://www.lynxmotion.com/s-5-ses-3d-models.aspx. You could make a model of the ServoCity base, add the SES models, and mock up various configurations of your project until you find the best solution.

By the time you are done, you'll be way out of my league. But that's sort of the point isn't it.

Good luck,

_________________
Ted, RoboTed
Never quite finishing means never having to admit failure!

Not directly compatible without creating a custom intermediate plate. The hole pattern on the ServoCity gear / hub is different than that of the Lynxmotion SES pattern. Consider the Heavy Duty Metal Arm Base:
http://www.lynxmotion.com/p-837-heavy-d ... ervos.aspx

Base rotate: one servo
Shoulder: two servos
Elbow: two servos*
Elbow rotate: one servo
Wrist: one servo (this does not take much torque, so you don't really need something with very high torque).
Wrist rotate: one servo (already comes with)
Gripper: one servo (don't need a $110 servo when a $10 servo will work well)

Total: 8 + 1 servos

Use the RobotShop Arm Torque Calculator to see just how much torque you need at each joint.

* Never seen this configuration before

_________________
Coleman Benson
Lynxmotion
Imagine it. Build it. Control it.™
http://www.Lynxmotion.com

Hi,

Just want to double check if I am not missing anything in my final shopping list (hardware & servos only). I am already including some extra stuff just to be on the safer side so Please let me know, if I may require any additional item even of minor nature (like screws, bolts, nuts, washers, etc). I want to place a complete order.

Q Description:
1 Base Electronics Carrier Kit
1 Aluminum Dual Servo Bracket (Single)
1 Aluminum Long "C" Servo Bracket with Ball Bearings Two Pack
2 Aluminum Multi-Purpose Servo Bracket Two Pack
2 Aluminum "L" Connector Bracket Two Pack
2 Low Profile Axis (no servos)
2 Load Balancing Spring - 1.5" 1.58lb
2 Load Balancing Spring - 2.5" 3.61lb
2 Steel Phillips Pan Head Screws - 3/8" x 2-56 (25)
2 Steel Phillips Pan Head Screws - 1/4" x 2-56 (25)
2 Aluminum Tubing Connector Hub (pair)
2 Aluminum Tubing - 3.0"
2 Aluminum Tubing - 4.50"
2 Aluminum Tubing - 6.0"
1 Heavy Duty Metal Arm Base (no servos)
2 Aluminum "C" Servo Bracket with Ball Bearings Two Pack
8 Servo Attachment Hardware Bag (Single)
1 HS7980TH
6 HSR5980SG

I am not including the gripper and its servo. Probably would try to fix something else at the end. I am also dropping the idea of using 2 servos at the elbow joint, so sticking to the standard 6DOF SES design as shown in the figure.

Any additions?
Thanks