This module guides the engineer on how to correctly set the cut lengths on Stuga saws
Author Gareth Green | Last edit 30/09/2019 by Gareth Green being drafted ⧼frevu-button-review-label⧽
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This module guides the engineer on how to correctly set the cut lengths on Stuga saws
Saw Cuts, bladeoffset, mitre, kerf
The engineer will need a reasonable mechanical knowledge, and a working knowledge of the operation of the machine.
The following steps are taken to set the saw lengths correctly:
· Scaling / calibration
· Ensure cut length consistency
· Set saw blade kerf
· Set blade offsets / and \
· Check mitre / mitre cutsIf this process is to be carried out on a flowline, it is very important for the full scaling procedure to be followed, to ensure accuracy across both machines
It is important to ensure that the cut lengths are consistent before any changes are made. An inconsistent result could throw all accuracy adjustments out, and will not find the root cause of the problem.
1. Cut 19 off 300mm pieces [ ] from a 6m length.
2. Mark each piece as it is cut
3. Check lengths of each one, measure across the BOTTOM of the profile
4. Check each cut for squareness
5. To pass, all cut lengths must be within 0.5mm
Factors affecting cut length consistency:
Possible Cause | Solution |
Backlash in saw pusher | Mesh the pinion into the rack tighter |
Profile “jumping” because a pneumatic function is jogging the profile | Smooth the motions with flow control valves and lock off with pliers. |
Profile jumping on Eject Clamp | Fit flow control to eject clamp down stroke |
Alignment / level of saw infeed | Check alignment with laser level
Saw infeed is forward of saw backfence |
High / Low Clamp pressure sticking on high | Faulty valve or pressure regulator; electrical fault |
On standalone saw: Slack Chain | Tension chain |
Pusher disappearing inside profile | Infeed tables raised |
The Bladeoffset parameters control how much the software moves the bar through to carry out a particular cut.
In the diagram, the red circles show the pivot point of the blade, and the blade in the 90 degree position and 45 degree position. Both 90 and 45 saw cuts would finish the piece off to the same length, but it is clear that a different position of the saw blade compared to the profile is required. This is demonstrated by the dimension x.
Because the saw cut is 45 degrees, the distance x is equal to the distance of the pivot point to the backfence. This is our bladeoffset parameter /, and it tells the software to push the bar through further on a 45 degree cut.
The same applies to the cut \ on the opposite end
Cut a bar with:
300mm [ ]
300mm [ ]
300mm [ /
300mm [ /
300mm [ /
300mm \ ]
300mm \ ]
300mm \ ]
Using a [ ] 300mm +/- 0.1mm piece as a guide, offer it up to the [ / pieces. It is much easier to find the point of the mitre for measuring when the piece is pushed up against another.
Measure the difference between the two pieces with callipers. Check with the other [ / pieces to ensure there are no random inconsistencies
Update the / Cut Offset parameter in “Machine Parameters” menu.
This is named BladeOffset / and BladeOffset \ in the windows version
Condition | Change |
[ / too long | Add to / Cut Offset |
[ / too short | Subtract from / Cut Offset |
Repeat for \ ] cuts
Condition | Change |
\ ] too long | Subtract from \ Cut Offset |
\ ] too short | Add to \ Cut Offset |
NOTE:
· Subtracting 0.5 from -65 gives -65.5 !!!!!
· On the older DOS Systems, one blade offset is positive, one is negative. Which is which depends on the handing of the machine:
Hand | / Cut Offset | \ Cut Offset |
Standard | + | - |
Opposite | - | + |
The newer Windows system has positive vales for both numbers, which makes it less confusing with the machine handing
Run the test again to check that the [ / and \ ] cuts align with the 300mm [ ] cut. This should be within 0.2mm
The last step is to check that the mitre – mitre cuts are the correct length.
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