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PowerMill 2018 Getting Started - Tutorial 3 - Stock Models and Boundaries - YouTube
Channel: Autodesk Advanced Manufacturing
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In this tutorial you will be introduced
to stock models and boundaries, learn how
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to clone a toolpath, and see how to
create a rest machining or rest roughing
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toolpath. The first toolpath we created
was used to rough out the majority of
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the material from our stock. We are now
going to tackle the remaining areas of
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excess stock on the part using a rest
machining toolpath. Let's rename our
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first toolpath as "Roughing" to help us
identify it later and then look at the
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remaining stock on the part. Autodesk PowerMill has the capability to build a
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model which represents the stock
material left after each machining
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operation, called a stock model. Stock
models can be referenced by subsequent
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machining operations, producing toolpaths that are as efficient as possible,
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continuously cutting material whilst
minimizing any fresh air cutting.
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To generate a stock model, again we can
create one either from the explorer tree
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or the stock model ribbon tab. Create a
stock model, let's call it "Stock Model"
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and leave the rest of the settings as
default. The stock model is initially
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empty so we need to add toolpaths to it, in order to build up the stock image.
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Add the roughing toolpath either via the
right-click menu or from the ribbon.
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Note that the toolpath is now in the stock
model list.
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Calculating the stock model will
generate the stock image. Items in the
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explorer tree can have their visibility
modified by using light bulbs. Let's hide
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the roughing toolpath to see the stock
model more easily. By default the stock
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model is wireframe but can be shaded
for better clarity.
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We can also view the rest material by
selecting the option to do so.
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Hiding the model makes this easier to see.
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Reshade the model.
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Our stock model can now be used as the reference for subsequent operations. Although we could
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create a rest machining toolpath in the
same way as shown previously, in this
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instance we're going to clone a toolpath instead. If we revisit the roughing
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toolpath settings we can create a clone
directly from the toolpath settings
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form. By creating a clone we obtain all
the settings of the previous operation
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allowing us to change the minimum number of options. Because we made edits to the
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toolpath a warning informs us of this
case. Choose OK.
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Some of the values you want to keep, others will be changed. Let's rename the toolpath as "Rest Roughing".
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From the tool area, let's change
to our 20 millimeter end mill. In the limit
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section we will define a boundary to
limit the toolpath to stop it working
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down the sides of the part. Select the last icon for the
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user-defined boundary. In the graphics
area select the bottom surface of the
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part and then press the insert model
icon to create a boundary. Accept to
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close the form. This boundary is active
and so will be used for the toolpath.
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In the model area clearance section we will check the option to rest machine.
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Note a new section appears in the form to
define the rest parameters. Since we are
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using a smaller tool and we are trying
to remove the material left by the
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previous operation we will adjust the
step over to be 10 millimeters and the
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step down to be one millimeter. In the
new rest section we can choose our reference.
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Rest machining can reference
either a singular, previous toolpath or
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a stock model, the latter of which has
the advantage of effectively allowing
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multiple toolpath references. Two key
settings to change here are the
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"detect material thicker than" and "expand area by" settings. The detect material thicker
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than setting tells PowerMill to ignore
rest material that is thinner than the
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specified threshold. This helps avoid
thin regions being rest machined
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such as those caused by cusps from the
previous toolpath where the benefit of
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a second cut is negligible. The expand
area by setting will expand the rest
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areas measured along the surface by the
distance specified. We will set 0.3
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millimeters and four millimeters
respectively. The final option we will
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modify is to switch off the unsafe
segment removal tool since this tool is
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center cutting. Hit calculate to generate
the toolpath.
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This toolpath will will take longer to calculate but the toolpath produced will be efficient
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saving overall machining time. We can add this new toolpath to our stock model
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and calculate it. Once calculated we can
save the project again to complete this tutorial
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