cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Showing results for 
Search instead for 
Did you mean: 

Helicoil representation in 3D model

Re: Helicoil representation in 3D model

I am ok with using either a plain round helicoil or the fancy one you can download from McMaster. I don't have many.

My real question is what to put as tap in the part that receives the helicoil. I can show a thru hole, followed by a cosmetic thread. What would be the values of the 2 diameters?

I am using currently 4-40 & and 1/4-20 helicoils.

Does anyone have a chart?

Re: Helicoil representation in 3D model

I don't use them but I know of an application here that uses them regularly. I looked two up and this is what we did on those drawings...2 different styles.

The first specifies all the dimensions.  The second, we add the taps as a BOM item (qty 0 so they don't buy it for every part)

 


Steve Williams
Pro/E Version 15/16 (Circa 1995/1996)

Re: Helicoil representation in 3D model

As Kevin mentioned you should just specify install per NASM33537. NASM33537 has the information for drill sizes, depths and tolerances. It also has information for how far below the surface the Helicoil should be installed.

Highlighted

Re: Helicoil representation in 3D model

I will see what I can get from that spec. Regardless of how I call them out. My main question remains as to how they should be modeled with the intent to clearly have them represent a helicoil ready hole.

Re: Helicoil representation in 3D model

It's no different than any other threaded part / assembly.  ASME Y14.6 gives you 3 methods of representing the threads.  The "schematic representation" is actually the most difficult one to reproduce in Creo. so you rarely see anyone trying to do it.  "Detailed representation" involves helical cuts and protrusions.  It looks pretty, but costs a lot in both modeling time and regeneration time.  "Simplified representation" is the easiest one to implement.  Internal threads are modeled at the minor diameter with a cosmetic thread at the major diameter.  External threads are modeled at the major diameter with a cosmetic thread at the minor diameter.

References to custom hole files is mis-direction. Yes, it's a shortcut if you make a lot of drilled and tapped holes, but it's not a requirement.  For an infrequently used custom, manually modeling an internal thread as one or more cuts plus the cosmetic thread is also correct.  There aren't "hole" files for external threads, so you have to model it manually anyhow.  Yes, you could make UDFs for "external holes", but just take the 2 minutes to model the thing manually and be done with it.

Re: Helicoil representation in 3D model

IF NASM (in my day it was simply NAS) is the spec needed.  We used "MS" specs a lot.  For his threads, he might not need a "mil-spec".

Typically, if I remember, we did not specify the tap, only the finished thread, and specified:  "preparation for and installation of threaded inserts shall be in accordance with......".  And we also had a BOM and BOM balloon pointing to the insert.

Re: Helicoil representation in 3D model

I agree Frank. We did the same. just said to be done per.....

I guess I just got it in my head yesterday that maybe the model should be shown a certain way. I would think the correct way is the finished tap that is required to prep these holes. I see the tap on Mcmaster....but did not seem like it had the values I was wanting.

Re: Helicoil representation in 3D model

The NASM standard is the superseding standard for MS33537. The latest revision is from 2013.

Re: Helicoil representation in 3D model

Hi Falco,

not sure if your question is already answered. Maybe this will help anyway.

Find attached a PDF for Helicoil inserts. On page 18ff you find all drilling and tapping information.

I also attached our hole chart for inch and metric Helicoils.

helicoil.pnghelicoil_hol.png

Since Creo 3 you can use the Intelligent Fastener Extension to create fasteners.

It is possible to assemble Inserts with this tool. Use Inserts in IFX

helicoil_in_ifx.png

Regards

Oli

Re: Helicoil representation in 3D model

Hi Oliver,

I have a question as to how you constructed the provided hole charts.  For example, according to the attached PDF catalog, M6X1 table calls for drill diameter of 6.3mm and the corresponding tap with a max. major diameter of 7.422mm.  But your hole chart has 6.3mm tap drill diameter (ok, but with major diameter of 7.300?)  I am just curious from where the basic diameter numbers are coming?  Is it some kind of a median between specification's max. and min. value?