Shrink compensation

Август 5, 2022

Содержание

2. Application Summary Material shrinkage occurs in thermoplastics as they transition from liquid state to solid state
3. Shrink Compensation Values for VisiJet Materials These shrink compensation values serve as general guidelines to setting
4. Enter Default Shrink Comps for Material in Use Open ProJet Accelerator Client software and select the
5. Build Calibration Cubes (1st Iteration) Use the two calibration cubes (solid and hollow) that accompany this
6. Take Measurements and Determine Scaling Factor Use the calculation spreadsheet that accompanies this manual to determine
7. Enter “Scaling Factor” for Repeat Build (2nd Iteration) Open ProJet Accelerator Client software and select the
8. Modify Default Shrink Comp Values Another alternative is to apply the x,y or z scaling factors
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Application Summary
Material shrinkage occurs in thermoplastics as they transition from liquid

state to solid state during the curing process.
The ProJet Accelerator Client Software has features that allow the user to compensate for the natural shrinkage of the material in order to fine tune the accuracy of a part.
The following instructions will explain the process for entering shrink compensation and calibrating a machines using standard calibration cubes. This process can be used for measuring and dialing in accuracy for any geometry.

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Shrink Compensation Values for VisiJet Materials
These shrink compensation values serve as

general guidelines to setting shrink compensation. Part building and cleaning in a controlled process will best determine the optimal shrink compensation values for a particular geometry.

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Enter Default Shrink Comps for Material in Use
Open ProJet Accelerator

Client software and select the desired printer.
Select the “Submit” icon to start a build session.
Select the “Options…” icon as indicated.
Within the “Options” panel, enter shrink compensations values for X or Y or Z
SEE TABLE ABOVE FOR SHRINK COMP VALUES FOR THE MATERIAL BEING USED.

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Build Calibration Cubes (1st Iteration)
Use the two calibration cubes (solid

and hollow) that accompany this manual.
Set up build with one of each calibration cube in the correct orientation.

Build and post process calibration cubes using standard cleaning methods.

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Take Measurements and Determine Scaling Factor
Use the calculation spreadsheet that accompanies

this manual to determine the required scaling factor OR do calculation by hand using the following formulas:
X Scaling Factor = (XCAD - XPART)/ XCAD * 100% (answer will be as a percentage)
Y Scaling Factor = (YCAD - YPART)/ YCAD * 100% (answer will be as a percentage)
EXAMPLE:
X measurement of CAD model = 3.000”
Y measurement of CAD model = 5.000”
X measurement of printed part = 2.998”
Y measurement of printed part = 4.989”
X Scaling Factor = (3.000 – 2.998)/3.000 *100 = 0.067%
Y Scaling Factor = (5.000 – 4.989)/5.000 * 100 = 0.22%

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Enter “Scaling Factor” for Repeat Build (2nd Iteration)
Open ProJet Accelerator

Client software and select the desired printer.
Load the calibration cubes.
• Open Print Preview to view the models. Select the models (color should be yellow)
Select the “Scale” Icon

Uncheck the “Isometric Scale” button. This allows user to make individual x and y adjustments.
In the previous example, the x scaling factor should be 100% + 0.067% = 100.067%
The y scaling factor should be 100% + 0.22% = 100.22%
Enter these two numbers in the corresponding scaling boxes for x and y.

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