SPLINE CLARIFICATION PLEASE
SPLINE CLARIFICATION PLEASE
(OP)
Hi.
Could someone please clarify the apparent discrepancy shown here in the attached image.
(I say apparent because I simply don't understand, so they may well be accurate indeed).
The illustration is from the machinerys handbook, and seems to suggest that a fillet root spline doesn't necessarily have a full rad, i.e. rfi = 0.4m but if Full radius is smaller, use full radius.
The comment at the bottom of the image is from
http://www.gearsolutions.com/article/detail/5604/i...
which states it is a full form rad.
Thanks
Could someone please clarify the apparent discrepancy shown here in the attached image.
(I say apparent because I simply don't understand, so they may well be accurate indeed).
The illustration is from the machinerys handbook, and seems to suggest that a fillet root spline doesn't necessarily have a full rad, i.e. rfi = 0.4m but if Full radius is smaller, use full radius.
The comment at the bottom of the image is from
http://www.gearsolutions.com/article/detail/5604/i...
which states it is a full form rad.
Thanks





RE: SPLINE CLARIFICATION PLEASE
RE: SPLINE CLARIFICATION PLEASE
I'm not using any standard.
I don't even have a spline.
I'm just reading up on the subject and trying to understand, when I came across this apparent contradiction, and hoped someone could explain it.
RE: SPLINE CLARIFICATION PLEASE
here are 3 attributes of many that need to satisfy the specification.
the root diameter size
the fillet radius specified.
and the fillet radius must clear the form diameter.
the size of the fillet radius can not interfere with the form diameter(TIF) prevent interference with mating part.
so it may be limited how large it can be. and it will vary from design to design.
that said, if a minimum fillet radius is specified it can well become a full radius
if it meets the criteria as noted above. this is the simplified explanation.
now if the designer needs a full fillet it must be specified and it (the design)
must clear the TIF so there is no interference with the mating part.
Mfgenggear
RE: SPLINE CLARIFICATION PLEASE
RE: SPLINE CLARIFICATION PLEASE
@mfgenggear
So, it appears that you agree this following statement isn't accurate ?
"The fillet root side fit spline exhibits a full radius in the trochoid area between the teeth on both members."
Should it really state,
The fillet root side fit spline, sometimes exhibits a full radius in the trochoid area between the teeth on both members.
Thankyou
RE: SPLINE CLARIFICATION PLEASE
Correct, as stated if it does not specify full radius required
as long as it meets the minimum fillet radii it is in conformance.
Mfgenggear
RE: SPLINE CLARIFICATION PLEASE
Thanks for your help.
RE: SPLINE CLARIFICATION PLEASE
The type of spline shown in the OP example is a "fillet root" spline, but does not necessarily require a full fillet radius. For fillet root, side fit splines having a 30deg PA the ANSI B92.1 spec simply requires a minimum root radius for both internal and external teeth as defined in table 108.
Per ANSI B92.1 30deg PA major diameter fit splines, the internal teeth must have a root fillet that clears the external tooth tip chamfer dimension listed tables 17 thru 24. The size and shape of the external spline root fillet is optional, as long as it conforms with other dimensions listed like form diameter/clearance.
Generally, the root fillet stresses of the external teeth will be higher than for the mating internal teeth. So it would be beneficial to use as large a root fillet radius as practical at least for the external teeth.
RE: SPLINE CLARIFICATION PLEASE
Thanks for taking the time to investigate my query, and for your in depth clarification.
It makes much more sense now.
Thanks again.