The seating control strategy on Atlas Copco controllers is specialized for joints with
increased rundown friction, such as threat cutting screws, or joints with side-loads
from misaligned parts.
The strategy will detect the screw seating and compensate the rundown torque and friction
to install the same clamp torque for every screw.
Floating screws are eliminated while thread stripping and broken parts can be detected
and reported to the operator.
Let’s take a look at how the Pset is setup in ToolsTalk MT.
Here is our seating control strategy Pset.
It’s a two-step Pset.
The first step is a thread engagement step.
This is designed to help the screw start to thread into the surface of the joint.
The second step is the seating control setup.
Here we set our speed and we set our final tightening method.
We can either control it to stop at a certain torque point or at a certain angle.
I’m going to do torque and I want our desired clamp torque to be about 5cNm.
The seating angle displacement will be 180 with the gradient trigger point being 75.
These two values are going to be what allow the algorithm to detect when the seating has
occurred by how fast the gradient ramps back up.
We’ll see what this looks like when we use the trace view later.
We can also set minimum torque and maximum torque values for the entire tightening if
we do have a maximum torque load that we don’t want to exceed, we can prevent the tool from
doing that by entering it here.
We can also set minimum clamp torque and maximum clamp torque to have the Pset fail or not.
I’ll set the min. clamp torque to 3, and the max. to 8.
So we are aiming for that clamp torque of 5, but now I’m going to set limits so the
Pset will fail if we don’t hit that.
We can also do the same for angle but I’ll leave that at the default setting.
Once we are all done we will save our settings and make sure we activate it on the controller.
On the controller I’m going to navigate over to my custom view where I have our peak
torque, our total angle, the seating point and the clamp torque.
Now for this Pset it’s only going to care about reaching our desired clamp torque of
5cNm.
It’s not going to care if the peak torque is at 10 or at 8.
That doesn’t matter right now.
So you can see the first one we reached our clamp torque of 5cNm and our seating point
of 4.16.
The peak torque was 9, but that’s going to change from joint to joint.
I’ll open up our trace viewer on screen here so we can have a look at what’s going
on.
Here we can see that gradient ramp up that detected the seating point.
This has to happen within a certain time and value, we’ll do a tutorial and get more
in-depth with how to set that value.
Here we can see our clamp force was 5.027 cNm.
Right on target.
So let’s now change to a size hole that is slightly smaller than the size holes we
are working on now.
So now we should experience the same clamp torque, but our peak torque which was staying
around 9.5 will increase.
Now our peak torque is at 10.75.
But notice how the clamp torque stayed at 5.
That one even closer to 11, but consistent clamp torque, very consistent clamp torque.
That one was at 11.
If you’d like more information on this product, we are using the MT Focus 6000 controller
here.
You can go to the link in the description and pick one up for yourself.
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Thank you for watching, and as always have a good day.