Parametric Model for Valve Block
ET 349 LABORATORY 4
Introduction to OncCNC
PURPOSE:
The purpose of this laboratory exercise is to familiarize
students with OneCNC software. Students will create required geometry
as outlined and use the software perform related cam activities.
A full simulation will be executed to verify
the tool paths required to machine the part. This exercise
will include the completion of the tool paths from the part provided in the following sections.
Objectives:
After completing this exercise, students should be gain knowledge and performance skills related to the following:
1. Importing a file from a prevously created parametric model or 2D dxf file
2. Establishing the part
zero point (referenced G54 workplane)
3. Create a pocketing toolpath
4. Select the appropriate
tool for machining the part
5. Specify the machining
parameters
6. Simulate the toolpath
7. Post process the toolpath
8. Generate a set-up sheet
for the part.
Procedures: The following steps should be taken to carry out this laboratory exercise.
1.
Download and save the IntroONECNC.dxf file that was emailed to you from the instructor
2. Import the file into OneCNC software
3. Delete all views except the TOP VIEW; delete the title
block, mapping locators, and all other non-essential elements.
4. Move the top view to the origin as shown in the following sections
5. Select from the NC menu the pocketing option, and create an internal pocketing operation
6. Select from the NC menu the profile chain option and profile the part
7. Select from the NC menu, hole recognition feature, and drill the mounting holes
3. Simulate the tool path
after specifying the required stock parameters
4. Post process the tool
path for a HAAS controller
5. Generate a set-up sheet
from OneCNC
6. Write a laboratory report
using the following format provided at the end of this laboratory exercise.
INTRO TO OneCNC Software
The following section will provide a summary guide for creation of the part as depicted in illustration one. A series
of screen shots are provided, along with the steps needed to lead you through the process of creating tool paths from an
imported DXF file.
The following model was used
to create the corresponding drawing file and dxf file for importing
into OneCNC. A jpeg of the dimensioned drawing along with the dxf
file was emailed to your Catamount email address.
Parametric
Model for Valve Block
Engineering
Drawing of Valve Block
DXF
File Ready for Import to OneCNC
Step 1: Start OneCNC XR3. Upon successful launching of OneCNC the screen should look like the one shown below.
Step 2: Select File Import DXF
Step 3: Import the Valve Block dxf file that was emailed to your account.
Step 4: Change View to Top View.
Step 5: Delete all extra views, title
block, and characters at or near the origin. You may elect to
delete all other items EXCEPT the TOP VIEW of the part. After
selecting the region to be deleted, press the DELETE key on your
keyboard.
Step 5: Move the TOP VIEW of the dxf file to the origin (0,0,0) by first going to EDIT, COPY OR MOVE.
Step 6: Window around the TOP
VIEW of the PART in preparation for executing the MOVE command.
After windowing around the region to be slected, the part should turn
red as shown below.
Step 7: Next, from the menu, select EDIT, COPY OR MOVE command, the Press the OK dialoge button.
Step 8: At the position prompt,
Select ENDPOINT and Click on the leftmost point of the top horizontal
line of the part.
Step 9: At the "Pick Position to Copy to" prompte (in green box at the botom), select COORDINATE, Type in ZERO for the
X, Y, and Z coordinates in the dialog window.
Step 10: Your part should not be located
with the upper-left corner of the part at the origin (0,0,0).
Select the part by selecting Region, windowing around the TOP VIEW at
its new location. Go to VIEW, ZOOM Selection to center the view
on the screen. You may want to ZOOM OUT one time to size the part as
shown in the illustration below. You are now ready to begine the CNC
Tool Path process.
Next, you should eliminate delete the geometry
that is not part of the Profile Chain as shown in the illustraions
below. Go to EDIT, TRIM-EXTEND, and slect the scissors
option. Trim the "square corners" of the part as shown below.
From the top menu, go to NC and slect the NC STOCK option, then slect PROFILE CHAIN and click OK.
Step 11: To execute the PROFILE CHAIN
command, Click on the part geometry for the round at the upper
left corner of the part, and move the cursor to where the arrow
indicating clockwise direction is on the OUTSIDE of the part as shown
below. Next select the end of the chain, then RIGHT CLICK!
Step 12: The next step is to select the
tool for the profiling operation. The tool selction menu will
automatically pop up. Click on the arrow near the tool icon as
shown.
Step 13: A tool table will automatically
pop-up. From the table, select 1" HSS End Mill. Make sure
you are selecting from the END MILL table and NOT the Ball NOSE.
Click on ACCEPT near the bottom right.
Step 14: Upon selection of the tool, a
series of dialog menus will appear. Make the selections as shown
in the illustrations below:
Next Click on the STOCK box. A table will
automatically appear. Select Aluminum Billet from the table
(first entry in the table), then click on ACCEPT.
You will be returned to the TOOL parameters screen. Notice that the RPM and FEEDRATE has now been automatically entered. OneCNC automatically calculates the feeds and speeds based on the tool type and material selected. Be very careful when using this option. You should verify the feeds and speeds before continuing.
Click on the NEXT button and continue entering the parameters for each screen as shown below.
Click on the FINISHED button located at the
bottom right of the screen. Next LEFT CLICK on MILL PROFILE shown
at the right top of the screen under the TOOL PATH GROUP section.
A graphic indicating the tool path and a summary of the selected tool
parameters will be shown.
Next, a simulation of the tool path will be created. On the MILL PROFILE, RIGHT CLICK and select SIMULATE/REST.
A graphic will appear allowing you to set the size of the stock. Enter the values as shown below.
Click OK, and the simulation will be
executed. Note you can chage to ISOMETRIC view if you desire,
enlarge the screen, and a simulation in 3D will be excecuted as shown
below.
Note: This only represents the profile of
the part (with some problems that need to be corrected). Also,
pocketing, and drilling operations need to be performed. These
procedures will be addressed in class. For the purpose of
this tutorial, we will assume the part is ready to be "POSTED"
into the format that our HAAS machines will accept.
Step 15: Posting our the CNC code in word address format.
Right click on TOOLPATH GROUP and select POST GROUP as shown
below.
Next slect the post processor HAAS as shown below.
You may also edit and change the name of the
program, enter notes, or change the program number. After editing
the dialog box, click on POST as shown below.
You will be prompted as to where to save the CNC
code as a .ncc file. This is simply a text file that will be
produced ready for transferring to the desired HAAS CNC machine.
A JOB SHEET can also be generated as an option. NOTE: THIS
IS NOT A SET/OPERATION sheet, but a summary of the job to be
machined. It is recommended to include in your lab report.
This tutorial is intended to get you started
working with OneCNC and become familar with operations and dialog
boxes. To demonstrate proficiency in using OneCNC software, you
will be required to complete ALL CNC operations required to produce the
part as shown in the first illustration of this tutorial.
Pocketing operations along will drilling will be covered in
class. You will not actually machine the part, but rather
complete all the necessary steps up to the point of transferring the
CNC program to the machine. Please follow the format shown below
and include all deliverables. TYPE YOUR REPORT, make all
attachments professional and of high quality. Treat this exercise
as though you were on the job!
LABORATORY REPORT FORMAT
Title:
Your Name:
Lab Section:
Date:
Purpose:
Objectives:
Procedure: (What you did to complete the exercise)
Results (deliverables)
1. 3-D Illustration of the part.
2. Engineering Drawing of the Part
3. DXF print out or screen capture from OneCNC
4. Simulation of toolpath (screen capture from OneCNC, Isometric
5. Job Sheet (produced from OneCNC)
6. Set-up sheet generated from OneCNC
7. Sample machine code (first page of cnc code post processed from
OneCNC)
Note: The actual code may be several pages long: You do not
need to print the
entire
program. Only provide the first page of code.
Conclusion/Discussion: (Discuss the outcomes and describe any
difficulties encountered.
Make recommendations for changes for improvements).
NOTE: LAB WRITE UP AND DELIVERABLES ARE DUE AT THE BEGINNING OF
THE NEXT SCHEDULED LABORATORY SESSION.