Hello! New here.
I’m trying to build my first robot and am trying to find parts that will fit what I need. I’m trying to build something that can pull these tubes apart for me. I used a grip strength tester to see how much force it was taking me to pull the top off of the tube horizontally. It was about 6 pounds of force needed for grip strength. Where can I find the specs on parts that tells me information like that?
The first combo kit that looks good to me was: Lynxmotion AL5D 4DOF Robotic Arm SSC-32U Combo Kit (FlowBotics Studio) - RobotShop
But I didn’t see that kind of spec so I wasn’t sure if it would work.
Hello @DakAttack and welcome to the RobotShop community,
You can find the parts included in the kit in the “What’s included section” and you can find the specs for each motor by consulting their descriptions.
Regards
I’m extremely new to this.
Here’s my follow up on this info. I looked in the what’s included section and I guess I still don’t see this table.
As it pertains to the gripper servo, it looks like it creates 57 Oz-in as it pertains to torque. Does that mean the maximum grip strength with that servo would be 3.5 pounds?
If so, I need something more along the lines of HS-755HB that can get over 10 pounds. Am I measuring how that torque is measured properly as it pertains to grip strength, and who can I contact to know if those motors can be easily switched out?
The what’s included section lists the servos included in the kit.
The table I shared is found here and was just for reference so you know where each servo goes.
There you can see the gripper uses this servo:
The HS-755HB is a bigger servo so it can’t be switched out but you could replace the HS-422 with another standard size servo (1.59" x 0.77" x 1.44").
I found one that I believe should work for the size:
I couldn’t find a non waterproof version, but I think it should work.
The other question I would be trying to figure out is knowing if the friction coefficient, physical grabber and our tubes all make sense.
@DakAttack Calculating the force applied by the fingers of the Little Gripper Kit is actually quite difficult to calculate given its configuration. Although the servo’s output horn rotates, there are two smaller round pieces of plastic which wrap around this center horn and push or pull the fingers. This means the force is not constant. We can say from experience that you can put your (human) finger between the gripper fingers and it would impede the motion but not hurt much. However, putting 3Kg on a human finger does indeed feel like a LOT more force.
Without knowing the details of your setup, it’s difficult to propose an alternative solution, but if the motion is linear, consider using a linear actuator:
https://www.robotshop.com/en/actuators.html
You might use a second, smaller linear actuator to expand something (fingers for example) on the inside or on the outside of the tube.
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