ABS Plastic Machining Precision
ABS Plastic Machining Precision
(OP)
Hi Every one,
I have an machining operation where a robot has to machine holes in abs plastic and machine square holes to accurate measurements say for instance machining the keyboard pockets in Atm machine front fascia. I have faced problems earlier with ABB robots where in the robots shows signs of overshoot at corners of the sqaure, which we had resolved by tunning PID values of the servos.
Does staubli show such problems as well, while doing machining operation to an accuracy of + or - 0.3mm. Please do recommend a model of staubli robot that do these operations with out any problem. I have attached a picture of a ABB robot doing the operation with an overshoot shown on its corner.
Cheers,
Bharat
Software engineer
I have an machining operation where a robot has to machine holes in abs plastic and machine square holes to accurate measurements say for instance machining the keyboard pockets in Atm machine front fascia. I have faced problems earlier with ABB robots where in the robots shows signs of overshoot at corners of the sqaure, which we had resolved by tunning PID values of the servos.
Does staubli show such problems as well, while doing machining operation to an accuracy of + or - 0.3mm. Please do recommend a model of staubli robot that do these operations with out any problem. I have attached a picture of a ABB robot doing the operation with an overshoot shown on its corner.
Cheers,
Bharat
Software engineer





RE: ABS Plastic Machining Precision
You give no details on the payload or reach required, much less speed of travel etc. You must spec that info to determine robot model.
TygerDawg
Blue Technik LLC
Virtuoso Robotics Engineering
www.bluetechnik.com
RE: ABS Plastic Machining Precision
The robot that was used previously was IRB2400 robot from ABB. it could take a payload of 16 kilos and we had a spindle at the ned of the robot which weighs about 7kg. The speed it was run at was based on the chip load and the speed was kept at 40mm/s max. The way i got around that was going in and coming out of the corners at 5mm/s. That way it overcame the problem, but didnt resolve it completly. DO you have any contact or emial id of the Staublis application engineering dept.
RE: ABS Plastic Machining Precision
The last I heard, Application Engineering centers are at the Headquarters in Faverges, FRANCE; Bayreuth GERMANY; and North American HQ in Duncan, South Carolina USA
TygerDawg
Blue Technik LLC
Virtuoso Robotics Engineering
www.bluetechnik.com
RE: ABS Plastic Machining Precision
Ed Danzer
www.danzcoinc.com
www.dehyds.com
RE: ABS Plastic Machining Precision
It was like the robot did a jerk as it started the move and when ever it changed direction.
Thats why I reduced the speed of the robot movement to say 5mm/s , for first 5mm of the distance and then ramped the speed up to 40mm/s.
RE: ABS Plastic Machining Precision
If you go to this page it will provide some additional information: http://www.danzcoinc.com/html/spindle_tester.html
Ed Danzer
www.danzcoinc.com
www.dehyds.com
RE: ABS Plastic Machining Precision
The problem was resolved by doing the following,
1. changing the PID values for robot axis servo.
2. Changing the speeds as we approach the corners and move out from the corner.
3. The tool angle and orientation is changed outside the material and then the drill bit is moved into the robot.
Now the machine is best sent to the client and he is happy with it.
Since we are looking at a similar application again, I would want to use a ABB robot as I had this bad experience with it. I was wondering if there is any other industrial robots which doesnt show this overshoot problem.
RE: ABS Plastic Machining Precision
Ed Danzer
www.danzcoinc.com
www.dehyds.com
RE: ABS Plastic Machining Precision
RE: ABS Plastic Machining Precision
Ed Danzer
www.danzcoinc.com
www.dehyds.com
RE: ABS Plastic Machining Precision
Will the manufacturers do the stiffness test on their own and give us the results.
Cousl you explain the stiffness test, how should it be performed?
RE: ABS Plastic Machining Precision
The objective of the test is to measure deflection when a load is applied similar to the cutting tool forces. The cutting tool force is tangential to the flute so you need to measure the deflection in a 360° rotation. The test should be done two different distances from the center to see if the results are linear.
Ed Danzer
www.danzcoinc.com
www.dehyds.com