Helicoil Major dia

[ckwhite]

I am threadmilling helicoil and standard tapped holes with the same threadmill. The problem I am having is that the operator has to adjust the D-comp constantly. I think my problem is the major dia I have programmed for the STI threads. The only information I have shows me the " Tap Major Dia Max". I need to know the nominal.

 

Anyone know where to find this information.

[dolphin1]

parker kalon has a downloadable app for the pc.

[Dave.L]

Kelly,

 

I just emailed you the Helicoil catalog.

[Steve Z]

? for you.....Did you pick a point when selecting the operation. Or did you select the hole itself. Just curious....might be why operator had to adjust comp value.

 

In cut parameters, for id/od thread choice is major thread diameter blanked out(meaning you can't input value).

[Ron Branch @ Verisurf]

A couple things here. Always use point for these toolpaths never use arcs or solid geometry. Always draw your threadmill to the size you measure not the one the book says it is. Then make sure you allow finish pass. Some materials you can cut one pass, but most you need a finish pass.

 

HTH

[ckwhite]

Dave, check pg 20 of what you sent me. The spec only shows the MAX for the major dia. I'm trying to find the nominal.

 

I always draw the major dia and mask on that arc to chain the points.

[Steve Z]

CREATE A POINT AT YOUR THREAD MILL LOCATION, USE THE POINT, DO NOT MASK ON THAT ARC AND TRY TO RE-POST/RE-RUN OPERATION. I THINK THAT MAY BE SOME OF YOUR PROBLEM....SORRY ABOUT TYPING IN CAPS

[ckwhite]

steve, the files are identical if you mask on arc or not.

[Steve Z]

but are you now able to input major thread diameter in cut parameters? and is it (major thread dia) the correct #? just trying to trouble shoot....

[Ron Branch @ Verisurf]

Ok you got 50 holes you need to do. What is easier changing the value in the operation or re-picking all off those circles and changing the size of them? I always train people to use the simplest method to create the least amount of work down the road. Yes it may take an extra step to create a point on a circle or solid, but the down the road time is where this always pays off. Habit is what you make and if you have the habit of something then you stick with that for the easy things, but helps you with the really hard things down the road.

 

Just my thoughts and do what every make you happy, we are just trying to offer suggestion to make it easier on you is all take from it what you will.

[ckwhite]

steve i don't know what the major dia of a ex: 1/4 - 20 helicoil should be.

 

When we thread mill.....

5/16 - 24 hole and a 3/8 - 24 hole my major dia is .3125 and .375

 

I can use a 5/16 - 24 threadmill to do both. and they come out right every time.

 

But when we threadmill....

5/16 - 24 hole and 5/16 - 24 STI hole my major dia is .3125 and .370(MAX)

 

I can't use the same tool because the STI hole cuts oversize. .370 is not the nominal major dia