Feedscrew [ Scroll] dialog-box


See Add Scroll


We have labelled the dialog as Feedscrew and Scroll because they are both very common terms.

Other terms include: Worms, Infeed Screws, Gusanos, and Tortillas sin fin.


Use the Feedscrew [Scroll] dialog box to:

Set the number-of-points along the feedscrew surface for each 'rim'
Set the Start and End - the 'range' - of the 3D-Cam
Edit the display of the feedscrew in the graphic-area
Export the feedscrew to SolidWorks®
Rebuild the feedscrew with the current or active settings.
Save the feedscrew data that defines the surface mesh.

To Open the Feedscrew dialog-box

1.Double-click a Feedscrew in the graphic-area

- or -

Feedscrew dialog-box

Dialog-R12-FeedScrew-Scroll

Buttons at top of dialog-box

Rebuild and Save Data buttons

Use the Rebuild button to
ore-calculate the points along each 'rim' when you change a parameter
obefore you use the Save Data button
obefore you transfer the Feedscrew to SolidWorks
Use the Save Cam button to save the feedscrew mesh data as text files.

 

       Number of Points 

Dialog-R12-FeedScrew-NumberPoints

Preamble:

We specify a Feedscrew with a surface.
There are a number of lines, that we call Rims, along the feedscrew surface.
There is one Rim for each Motion-Point as defined by the Motion-Path FB.
There are a number-of-points along each Rim.

Parameters:

Number-of-Points:

Number-of-points along each Rim. - 860 in dialog to left

Screw Start/End 

Dialog-R12-FeedScrew-StartEnd

Preamble:

When you add a Feedscrew, MechDesigner will calculate its surface for a complete cycle of the MMA : 0 – 360

Use this separator to edit the range of the MMA for which you want to calculate the feedscrew.

The Number-of-Points along each rim does not change.


Parameters:

Feedscrew Start-Angle

Edit the Start-Angle

Feedscrew End-Angle

Edit the End-Angle

Display 

Dialog-R12-FeedScrew-Display

Preamble:

The 'MechDesigner Display' edits how the surface of the Feedscrew shows in the graphic-area.


Controls:

'Surfaces' ; 'Rims' check-boxes

Use the check-boxes to Show or Hide Surface, and Show or Hide Rims.

Solids: show or hide, with the colour in the 'colour' control, and with the Transparency given by the 'Slider'.

Rims: show or hide the Rims along the Feedscrew.

Color

Use the Windows color picker to select a color for the Feedscrew and Rims.

Transparency

Use the slider to change the Transparency of the Feedscrew.

SOLIDWORKS Data Transfer 

Dialog-R12-FeedScrew-SWTransfer

Preamble: When you have set the correct parameters in this dialog: Number-of-Point and Start/End Angles, then you can export the Feedscrew to SolidWorks. To do this

1.Open SolidWorks
2.Add and Save a new Part
3.Make sure the new Part is the 'active' document in SolidWorks

Buttons:

Create Feedscrew Blank in SolidWorks

MechDesigner exports the sketch of the Feedscrew Blank and its Axis-of-Rotation'
MechDesigner instructs SolidWorks to use the Feedscrew Blank and Axis to add a 'Revolved' feature

Create Feedscrew Surface in SolidWorks

MechDesigner exports the XYZ data of each Rim to a 'Curve' feature
MechDesigner instructs SolidWorks to use the Curves to Insert a Boundary Surface feature.

Cut Feedscrew Surface into Blank.

MechDesigner instructs SolidWorks to cut the Revolved feature with the Boundary Surface

See Troubleshooting below.

SOLIDWORKS Paths 

Dialog-R12-FeedScrew-CADPath

Preamble:

After you have sent the Feedscrew to SolidWorks, it is often useful to link the its file-name in SolidWorks with the Feedscrew element in MechDesigner. At a later date, when you open this Feedscrew dialog again, you can reopen the part in SolidWorks.


Buttons:

Get Cad Part Path button: Click this button to link the CAD file-name in SolidWorks with the Feedscrew.

The file-name, with its full path, is put into the 'Path of Feedscrew in SolidWorks is :

Open Cam Part button: Click this button to open the part with the file-name in the 'Path of Feedscrews in SolidWorks is' box.

Before this is possible:

1.You have previously transferred a Feedscrew to SolidWorks and saved the file,

AND

2.You have already clicked the button 'Get Cad Part Path' button.

tog_minus        Trouble-shooting the Feedscrew in SOLIDWORKS

Scroll20-Cut-Fail

The last command: 'Cut Feedscrew Surface into Blank' 3-R-RED-15 may not work, or appear not, to work.

CHECK 1: In SolidWorks, inspect the length of the Scroll Blank2-R-RED-15 relative to the Scroll-Surface1s-b.

In the image to the left, the left of the Scroll-Blank4-R-RED-15 is to the left of the end of the Scroll-Surface3-R-RED-15.

In this case, the 'Cut Scroll Surface from Blank' [button3-R-RED-15 in dialog] will not work.

Scroll20-Cut-Editsketch

You must, in SolidWorks, or MechDesigner

1.Edit the sketch of the Scroll-Blank2-R-RED-15

I prefer to edit the sketch in SolidWorks.

Scroll20-Cut-Editsketch2

2.Move the end of the sketch to the right of the end of the Scroll-Surface.

In this sketch, I have added a dimension between the end of the Scroll-Surface and the left of the Sketch-Blank.

Scroll20-Cut-Editsketch3

To help, I have, in SolidWorks, dragged the 'Revolve' feature  to below 'Feed-Screw Scroll Boundary-Surface'.

Then, as I edit the sketch for the Sketch-Blank I can see the end of the Scroll-Surface.

Scroll20-SurfaceCut-side1

CHECK 2: After you close the sketch and rebuild the model. the Surface-Cut feature in SolidWorks might cut to the incorrect side of the Scroll-Surface - see image to the left. In this case:

Scroll20-SurfaceCut-side2

1.Edit the Feed-Screw Scroll Boundary-Surface feature in SolidWorks
2.Click the direction arrow - see image- to reverse the direction of the Cut.

Scroll20-SurfaceCut-side3

In the image, you can see the Scroll-Blank has been cut correctly by the Scroll-Surface.

However, the Feed-Screw Scroll Boundary-Surface feature is still shown in the model

Scroll20-SurfaceCut-side4

CHECK 3: Edit the Feed-Screw Scroll Boundary-Surface feature to hide it from the display.

See image.

Scroll19

Finally, the scroll is correct.

Tutorial and Reference Help Files for MechDesigner and MotionDesigner 13.2 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd