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BudS
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Join Date: Apr 2009
Posts: 5

Cutting Buttress Threads

04/29/2009 9:10 AM

If a machinst has a requirement to cut o.d. buttress threads with a 50° angle, .25 threads per inch; his part is 11 inches o.d. what size pins should he measure over to check?
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Anonymous Poster
#1

Re: BudS

04/29/2009 9:20 AM

http://cr4.globalspec.com/thread/37021
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BudS
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Join Date: Apr 2009
Posts: 5
#2

Re: BudS

04/29/2009 9:31 AM

I got a message saying there was a comment to my question. It then says to "click on the title" to go to the comment.

WHAT TITLE? WHAT THE HECK AM I SUPPOSED TO CLICK ON???

The screen is full of a lot of stuff, many items can be called a title.
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nick name
Guru

Join Date: Mar 2007
Location: City of Light
Posts: 3943
Good Answers: 183
#3

Re: Cutting Buttress Threads

04/29/2009 1:55 PM

Is this the thread profile? If yes where is the 50° angle? If not give the profile you work after.
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BudS
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Join Date: Apr 2009
Posts: 5
#4
In reply to #3

Re: Cutting Buttress Threads

04/29/2009 2:07 PM

Greetings,

The 50° is where your illustration has 45° shown. The pitch (P) is .25 inches. The major diameter (overall o.d.) is 11.0 inches.

BudS
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nick name
Guru

Join Date: Mar 2007
Location: City of Light
Posts: 3943
Good Answers: 183
#5
In reply to #4

Re: Cutting Buttress Threads

04/29/2009 2:09 PM

Is it the only difference between standard and your profile?
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BudS
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Join Date: Apr 2009
Posts: 5
#6
In reply to #5

Re: Cutting Buttress Threads

04/29/2009 2:44 PM

I believe so. Basically, the machinist said his math results said he should use .25 pins to measure over which are actually too small.

The print just says 11" 4TPI Buttress Thread.
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nick name
Guru

Join Date: Mar 2007
Location: City of Light
Posts: 3943
Good Answers: 183
#7
In reply to #6

Re: Cutting Buttress Threads

04/30/2009 6:14 AM

sorry for error it should be "dimEnsions". The problem could have been solved either by a computation or by a CAD drawing.

As a remark the angle modification leads to a thinner thread which could modify axial force transfer between male an female threads.
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BudS
Member

Join Date: Apr 2009
Posts: 5
#8
In reply to #7

Re: Cutting Buttress Threads

04/30/2009 8:09 AM

I am very grateful to you Nick Name. I will print a copy of what you sent and share it with those in my team.

I bid you peace,

BudS
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