Hello,
I am looking for a arm with the ability of linear and rotational motion. the total linear displacement is about 20 mm but this should be done incrementally like each 0.2 mm and at each increment we need to measure the diameter a hole at different degree.
Imagine a hole of 3 mm diameter and 18 mm depth and we need to measure the diameter of this hole in depth. To this purpose, at the particular intervals in depth like every 0.2 mm in depth and at each depth 5 radial measurement every 22.5 degree should be carried out. Therefore, it is like nine angles at each depth. The sample could be 4 by 6 inch and 0.72 inch depth and its weight could be varied between 0.5 to 1.5 kg.
I am wondering if I can find an arm with this capability in the store or we have to design it.
Thanks for your kind consideration.
Best,
Sara
The robotic arms we carry are more hobby grade and none would have a precision of 0.2 to 1mm
A 4 by 6 inch opening would be fine, and instead of using a contact sensor to measure the distance, why not equip the end of the arm with distance sensors?
If you want contact sensors, you would need to program the arm to stop when it sensed resistance and record its position.
A 1.5Kg weight is quite a lot for a small arm - do you have an idea of a budget?
We encourage you to take a look though the following sections to see what is available:
robotshop.com/en/robotic-arms.html
robotshop.com/en/advanced-ro … ators.html
Thanks for your information. but I could not understand which robots in the second link can have a precision of 0.2 mm to 1 mm or if I use the distance sensors we do not need to have this precision?
I would appreciate if explain me more what is the advantages of distance sensor other than not needing the programming to contact sensors, and also let me know among all these robots which one specifically can meet our project requirements (axially and rotational), if “Robot Arm Mover4 Starter Set” can do all those needed motions can do move linearly and rotate at specific intervals.
yes, we are on the budget!
Regards,
or How about “Modular 4 DOF Robot Arm- Position Control (Aluminum)” and “Modular 4 DOF Robot Arm - Position Control (Carbon Fiber)” ?
The arms we carry unfortunately do not have that precision.
As you indicated, using non-contact sensors means you only need to lower a rod with sensors mounted on it rather than having the end follow the contour of the hole.
This is both easier to program, less prone to mistakes, costs less (only need one degree of freedom) and quite fast.
The mover series unfortunately do not have anywhere close to the accuracy you seek, nor do the 4DoF arms.
Could you please let me know what is the maximum precision of the mover and 4DoF in terms of rotation and axial movement ?
The precision is angular, so the closer the gripper is to the base, the more accurate it is, but the farther away, the less accurate. It is also dependent on the load being supported. As such, the manufacturer does not provide much information regarding the precision / accuracy. The arm needs to be calibrated before use, but realistically, you can expect around ±2cm resolution at maximum reach (with no load). It is important to note that this is not an industrial arm and is intended to be used primarily for research.
