RADIUS ON THE TIP OF A SPLINE

[Dobe]

Hello,
I am developing a die that will produce an involute interior spine die. With a die I cannot have sharp corners. Is there some kind of universal size for any radius on the tips of the spline? Everything I look at shows sharp corners. I have developed the part in Gear Trax and everything came out good except I can't figure out if there is a spot to add a radius on the tips.
I understand that the "R" has to be between the pitch diameter and the ID, for proper engagement of the mating spline.

 

[mfgenggear]

@Dobe
what specification does the internal spline have to comply with, the requirement?
is this die punching the internal spline?
what is the material of the part?

the fillet root is between the major diameter and the true involute form.
the clearance will depend on the type of spline this is, flat root, fillet root or major dia fit splines.[highlight #EF2929][/highlight]
is this a euro design or usa?

on the minor diameter spline tips a normally .007 max approximately. depending on the application and the specification.

 

[tbuelna]

The OP description is a bit confusing. It sounds like the die is for producing the profile of an internal involute spline. The tips of the internal spline teeth can have a tangent/tangent corner radius up to 1/2 the tooth top land width. However, increasing the tooth tip radius also reduces the tooth flank contact area.

 

[3DDave]

A diagram would help. I feel the description is for a tool to broach an internal spline, but with the major diameter contour replaced with full-rounds rather than sharp bottomed features to keep from chipping the corners a broach might suffer.

 

[Dobe]

HOPEFULLY YOU CAN OPEN THE ATTACHMENT AND VIEW THE SPLINED PART. YES IT IS A DIE PUNCHING AN INTERNAL SPLINE. WILL IT WORK YES. BUT THE DIE PUNCH WILL NOT LAST, ESPECIALLY WITH SHARP CORNERS. I'm THINKING THE "R" CANNOT BE BIGGER THAN THE DISTANCE BETWEEN THE MINOR AND PITCH DIAMETER.

 

[3DDave]

I have no application for a .dft file. Solid Edge is one of the lesser used applications. Can you save a PDF?

 

[Dobe]

Attached is the pdf requested. Yes it is fillet root.

 

[mfgenggear]

@Dobe
there is an error on the engineering drawing, the fillet root radius is larger than the clearance between the true involute diameter and the major diameter.
the radius will produce interference with the mating part unless the teeth are chamfered on the external part.

again which engineering specification are splines designed to?

the edge break on the minor diameter tooth tips can not be between the minor diameter to the pitch diameter, it violates the tooth involute profile.
that is why tip breaks have to be small as possible.
secondly punching this thin of material will cause raised edges and burrs. unless there is correct backing for the die set.
but burrs will happen and can cause issues with the assembly.
there can not be interference with this part and the mating part.
look at ANSI/ASME B92.1 for the correct callout for external and internal splines.
there is to much missing information on this drawing.
#teeth, diametral pitchs, the pressure angle.
Minimum Tooth Space Effective Size
Max Actual Tooth Space Size
Min actual Measurement between wires
Max Actual Measurement Between Wires
The Gear Wire Diameter.
also the pitch diameter runout is missing

 

[spigor]

The involute profile angle looks small for a spline.