How do i model 3.25-8 ACME- RH acme thread in solidworks?
It is external thread..not sure how to start one
Generate a shaft of the correct OD.
Generate a Helix with the correct pitch.
Sketch the tooth profile.
Sweep cut profile along helix.
How do I generate the toothe profile?
You'll have to search for Acme thread dimensions. The Machinery's Handbook is a good place to start.
Yes i've using Machinery Handbook for ACME thread dimensions, but stilll having issue for getting the correct dims.
look at this and see if this helps
Here is a very helpful spreadsheet. Let me know and keep it safe.
Thanks for the spreadsheet, it's very useful..
Found the attached online. Should give you what you need to make one.
I believe that going off the information in the attachement on my post above the attached model should be correct for what you need.
If anyone sees differently please let me know.
Looks good to me. The spreadsheet has all that informatin as well.
Very cool spreadsheet. Didn't see that unitl after I posted.
Thanks has saved my time and ummm butt many times. lol
I got the thread profile dims, but still doubting about the profile to be drawn i mean inverted triangle or a normal one..see the attched snapshot for thread profile dwg
It would be a trapezode shape. Open the sketch in the model I attached to see how I did it.
can you just tell me how did you arrive with those dims..
The angle per side is 14deg30" for the trapezoid. The height of the trapezoid is half of the pitch which in this case would be .0625". The width of the bottom of the trapezoid is .3707 x pitch which is .0463". It is all on the first page of the pdf I attached on the detail shown below and the table that says Acme Form Basic Dimensions.
Hope this helps
How do i adjust the Fcs, Frs dims in the tooth profile of thread?
Edit the sketch and then double click on them to change the value.
Also did you notics the ends of the thread profile. they're straight. How do we achieve it?
Just cut the thread all the way to the end and then do another revolved cut to remove threads leaving a straight profile. I modified my previous model to add an undercut.
You can check out a simple blog post I made that shows how to calculate Stub Acme or Acme dimensions based on the Machinery Handbook and also links to a Mathcad sheet you can download if anyone is interested in learning how to calculate the values them self. I also made a post on my blog in detail about how to create a User Defined Feature in Creo for Stub Acme thread forms. I didn't include the tooth profile but you would follow the steps in my blog plus the steps above to make a Library Feature in Solidworks to do the same thing. Things like Stub Acme threads that you model everyday should be made into some sort of easily usable macro type feature that you don't have to redo every part you design. Just Google steventaitinger stub acme if you are interested.
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