Creating teeth/grooves for adjustability

[michael_ray_neal]

I want to create teeth/grooves on the top of the Cup and on the bottom of the Table & Rail bodies so I can spin the table by loosing the center screw raising the Table up a bit and spinning it.  Then I can tighten the center screw back up and the table won't spin around due to the interlocking teeth.  Any thought on how to go about this? See attached picture and .f3d file for reference. Also note that for some reason I can't seem to get the Table & Rail to be fully constrained...Any thoughts to what might be up with this very simple sketch?

[jhackney1972]

You did not say how many teeth or the size but this is my guess.  I have placed 6 raised teeth on the Cup with matching teeth on the Table.  They are set back from the Cup edge by 1mm and are 1mm tall, all these dimensions can be easily edited in the timeline.  I have also constrained the Table sketch you were having issues with.  Model is attached.  Please let me know if you have questions, if not please select "Accept Solution" if this satisfies you question.  The Sectional Analysis is placed on two of the teeth and the Revolve Joint is set with the teeth in position when in Home position.

[michael_ray_neal]

Thanks John. I’m not in front of my computer until tomorrow morning but could you give me an idea of how you did the teeth?  I want to have teeth all the way around so I can move the table in 1/2 or increments. Also what did you do to constrain that sketch. I worked on it for 30 mins and gave up. I mean it’s a simple circle for heaven’s sake. 

[jhackney1972]

Take a look at the timeline and the sketch to see my process.  Then if you need more help, I will be glad to give it.  As I mentioned the number and size of the teeth can be edit as desired. It is now indexable in increments of 60 degrees (6 teeth).

[jhackney1972]

Well, you have had a chance to look at my solution, does it makes sense?  Do you need further help?  If not, please select "Accept Solution" to close your post and let me know I have helped you out.

[michael_ray_neal]

Just looking at it now and Im having a small problem duplicating the build you created when it comes to creating the Joint and selecting the correct snap points for both the Cup and the Table.  The Cup snap point should be the center of the cup (aka the screw hole), right.....and the snap point for the Table should be the center of the hole...right?

If I do this I get the table rotating but it's down the cup and I have to do a 28.7 offset Z .  I should not have to do this offset, right.  What an I doing wrong here.See attached drawing. and .f3d file.

[jhackney1972]

I cannot figure out what you are clicking on to place the Joint Origins.  The Video will show this.  I will not include the model since it is just a simple Joint.

[etfrench]

Model a Hirth joint. There are lots of tutorials available.

[michael_ray_neal]

Found my issue. I was selecting the wrong snap points.  Got that fixed but have an issue with the last combine as when I do it, It takes away my original Cup body. I noticed that your file didn't loose the original cup body.

Also just for my clarification, are the surface extends just there to add a temporary edge for the teeth for the remove body command?  Attaching my finished file so you can see what Im talking about.  Thanks.

[michael_ray_neal]

Oh, and notice that the Table & Rails sketch isn't constrained.  The file you sent across didn't show it constrained as well.

Shure would like to know what Im doing wrong on this.

[jhackney1972]

Nice Job!  You only missed the one check mark in the Last Combine, Keep Tools, in the timeline.  That check mark keeps the Cup component body which you were wondering about.  The video will emphasis this.  I download the model I sent to you and the Table and Rail sketch was fully constrained which I show in the video.

[michael_ray_neal]

Well that was a miss...lol 

I can't believe I missed this but you were right.  I will say that I deleted your file and redownloaded it again and it still shows the Table & Rail as unconstrained (see attached picture).  Im also attaching your file right back to you so you can see.  Im am using a MAC and if you're on a PC, maybe there is some weirdness going on here.

[jhackney1972 · Accepted solution]

It must be something weird going on, I download my file from your last post and the sketch is fully constrained.  No matter, you have your model corrected and you can see how I constrained the "phantom sketch".

[michael_ray_neal]

Ive got a call setup with Fusion in about 15 mins so I'll bring this up with them.  Other than that this has been a great learning experience and you were a great teacher.  Thanks again for all the help. Now I will send it to the printer and in the morning I should have a great model...fingers crossed.  I have a really nice FDM and it's never let me down....Probably shouldn't have said that.