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Posting a project for comments

64 REPLIES 64
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Message 1 of 65
Anonymous
3346 Views, 64 Replies

Posting a project for comments

I would like to post my final class project for comments; it contains a bunch of parts files, an assembly, a drawing, and a presentation. I have it in a zipfile, but if you folks prefer I could post in another format.

 

Many thanks in advance

 

Joe Stavitsky

64 REPLIES 64
Message 41 of 65
JDMather
in reply to: Anonymous

Extrude your Board sketch 10mm (away from you (-z)).

 


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Message 42 of 65
JDMather
in reply to: JDMather

Start a new sketch on the XY plane (rather than the part face - always use origin planes when possible).

 

Sketch a rectangle as shown out in space.

Add circles at both ends from midpoint of horizontal lines out to endpoint.

 

Slots.png


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Message 43 of 65
JDMather
in reply to: JDMather

Add vertical construction line.
Change horizontal lines to construction.

(there is an easier way to do this dragging arcs out from lines, but if you haven't been taught....)

 

Add a coincident constraint between the midpoint of the vertical centerline to the projected orgin center point.

 

Construction.png


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Message 44 of 65
JDMather
in reply to: JDMather

Dimension the sketch as shown.

 

slot sketch.png 

 Trim the insides of the arcs.

Then Extrude-Cut through all.


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Message 45 of 65
JDMather
in reply to: JDMather

Start the Rectangular Pattern tool and select the slot.

Select the hoizontal line for direction and set to MidPlane.

Set number of copies to 3.

Set distance to 42mm (be sure to change from Spacing to Distance.

 

It is almost always better to pattern features rather than to pattern sketches.

 

Pattern Feature.png


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Message 46 of 65
JDMather
in reply to: JDMather

Start a new part file to create u-bolts.

 

Sketch a rectangle as shown below the projected origin.

Add a coincident constraint between the top horizontal line and the projected origin.

 

U-bolt.png


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Message 47 of 65
JDMather
in reply to: JDMather

Add an arc to the top of the rectangle.

Add vertical line from center of arc to top.

Change the lines as shown to construction linetype.

 

u sketch.png


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Message 48 of 65
JDMather
in reply to: JDMather

Start a new sketch on the YZ plane (don't create any workplanes that are not needed).

 

Project Geometry the endpoint of the vertical centerline from sketch1.

Sketch circle at this point diameter 7mm.

 

profile.png


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Message 49 of 65
JDMather
in reply to: JDMather

Sweep the circle along the u path.

 

sweep.png


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Message 50 of 65
JDMather
in reply to: JDMather

Add the thread features and then the chamers (always do the thread before chamfer to get the correct length).

 

Save the file as Long U-bolt.

Save As the file Short U-bolt.

The file Short U-bolt should now be the active file.

 

long u-bolt.png


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Message 51 of 65
JDMather
in reply to: JDMather

Double click on the thread feature and set to 26mm length (of course do for both).

 

Edit Sketch1 and change the 50mm to 36mm.

 

Save the file.

 

Short U-bolt.png


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Message 52 of 65
Anonymous
in reply to: JDMather

Why circles and not arcs on the board features?

 

Thanks again

 

Joe

Message 53 of 65
JDMather
in reply to: Anonymous


@Anonymous wrote:

Why circles and not arcs on the board features?


Arcs would be better - trying to avoid any problems (with center point, tangencies...)

 

The way I would really sketch that is with a line, drag arc, line, drag arc never leaving the line command.  But beginners sometimes have trouble getting a handle on this technique.

And since we aren't even in the same room....


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Message 54 of 65
Anonymous
in reply to: JDMather

Insufficient constraints on the hole feature again... sadsad. I haven't tried any constraints yet but what you specified as I'm assuming you found those sufficient. 

 

Will try from scratch with arc.

 

Also - maybe I misposted, but between the 3 holes there should be 2 raceways for the bearings - width 7mm, depth 7mm. I should do these same way as the holes, right?

 

Thanks again

 

Joe

Message 55 of 65
JDMather
in reply to: Anonymous


@Anonymous wrote:

Insufficient constraints on the hole feature again... sadsad.


 

When you get something like this you have two choices.

1. Keep working at it till you find out why

or

2. attach the file and someone with experience will tell you why within minutes

 

1 is good, but don't take hours beating your head until you try #2.  Whatever you do, don't ignore and leave unanswered.  Finding the how and why will pay off dividends in the future.

 

For the bearing slots - do one and then mirror the other. On something this simple there probably isn't any advantage of mirror sketch or mirror feature.

 


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Message 56 of 65
Anonymous
in reply to: Anonymous

Second sketch, fully constrained. For some reason, the lines turned bule but the arcs didn't?

 

Message 57 of 65
Anonymous
in reply to: Anonymous

Can I change the amount by which I zoom in/out with the mousewheel?

Message 58 of 65
JDMather
in reply to: Anonymous

Forget drawing as arcs - draw as circles and trim as I first instructed.

 

You have an extra radius dimension (I didn't show to add any radius dimensions).

You are missing tangent constraints between the arcs and the lines.

If I remove the radius dimension and add a tangent constraint - the sketch turns color.


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Message 59 of 65
Anonymous
in reply to: JDMather

I can see where missing constraints are a problem, but does absolutely everything need to be dimensioned? For instance, do construction lines need dimensions?

Message 60 of 65
Anonymous
in reply to: Anonymous

Updated board, ubolts, and eyebolt. Let me know if all is up to spec and I will complete.

 

Really hope I can build this, but I'm worried that some of the detail work is <3mm. A worthy test of my dremel skills at the very least.

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