involute spline (internal)
involute spline (internal)
(OP)
can anyone help me please, im having trouble using this site as ive seen this question answered on here but cant comment on it! - im wondering if anyone can translate my info into a dxf file please?
INVOLUTE SPLINE DATA, FLAT ROOT, SIDE FIT, INTERNAL.
NO OF TEETH - 24
PITCH - 16/32
PRESSURE ANGLE - 30
BASE DIAMETER - 1.2990 IN
PITCH DIAMETER - 1.5000 IN
MAJOR DIAMETER - 1.5625 IN
FORM DIAMETER - 1.5500 IN
MINOR DIAMETER - 1.4375 IN
CIRCULAR TOOTH THICKNESS
MAX ACTUAL 0.1011 IN
MIN EFFECTIVE 0.0982 IN
INVOLUTE SPLINE DATA, FLAT ROOT, SIDE FIT, INTERNAL.
NO OF TEETH - 24
PITCH - 16/32
PRESSURE ANGLE - 30
BASE DIAMETER - 1.2990 IN
PITCH DIAMETER - 1.5000 IN
MAJOR DIAMETER - 1.5625 IN
FORM DIAMETER - 1.5500 IN
MINOR DIAMETER - 1.4375 IN
CIRCULAR TOOTH THICKNESS
MAX ACTUAL 0.1011 IN
MIN EFFECTIVE 0.0982 IN





RE: involute spline (internal)
To answer your questions: The reason you probably couldn't post on the other thread was becuase it was old, but that's probably a good thing as you should start a new question unless you're answering the original posters question.
The site doesn't give out contact information for any members. However, gearguru is pretty active, so he might read this thread (or he might not.
However, when it comes to someone putting your information into a dxf file ... ummm that sounds periously close to your asking someone to doing your work for you for free. I suggest that, as a first post, it doesn't make a good impression. Perhaps you should explain what you've done yourself so far and why you can't put it in a dxf file yourself (as I presume you're being paid to do). Then if someone decides they want to help you, they will.
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RE: involute spline (internal)
THANKS FOR THE REPLY
RE: involute spline (internal)
Your problem might simply be to know how to rotate this curve to have
1/2 the circular thickness to the right and 1/2 the circular thickness
to the right about the vertical centerline. The same applies to circular
space instead of circular tooth thickness for an internal spline.
If you can draw an external spline, you can draw an internal splince
by using the tooth circular space instead of the tooth circular thickness.
Reverse also the values of the addendum and dedendum.
RE: involute spline (internal)
RE: involute spline (internal)
what are trying to do with the DXF file. Wire EDM ? or just simply know to do it?
Mfgenggear
if it can be built it can be calculated.
if it can be calculated it can be built.
RE: involute spline (internal)
If you know how to draw an involute the rest is a piece of cake.
I can't help you with the dxf file (no CAD - retired years ago), but if you have some specific questions - ask.
And yes - let us know for what you need that dxf ?
Just two warnings:
Be sure that the circular tooth thickness is measured AS A LENGTH OF AN ARC.
And be sure that you use the appropriate part of that involute.
gearguru
RE: involute spline (internal)
RE: involute spline (internal)
i only have one problem now, when i draw and internal and external side fit spline then place them on top of each other there is clearance on the minor and major but the splines are touching, no clearance, the circular tooth thickness on both drawings is different so there should be clearance, is there a calculation to get circular tooth thickness into an angular size? or even a linear size? - i could easily offset lines allowing my parts to fit together but these parts have to be compatable with competetor parts.
this was a prototype part and ive made one fine but i now have the fun of making around 30 different size involute splines in batch quantities, i will be wiring some and getting horn inserts groung for otheres, either way once i can draw them succsefully on my cad i can output programs for any machine or wire or send drawings to horn to get some inserts made.
RE: involute spline (internal)
i cant open that file till i get back to work monday, ill have a look thou thanks
RE: involute spline (internal)
The math is basic. Are you a student?
RE: involute spline (internal)
no im not a student just hopless at maths
RE: involute spline (internal)
i opened your file and its identical to my 1st attempt, if i draw an internal and external the same they dont fit together, yours measures the same as mine? and i think the tooth thickness needs to be reduced. it measures 0.098 linear??????
RE: involute spline (internal)
so only 1 question left - what size do i use for circular tooth thickness, is it in the middle of max effective and min actual (internal spline), or (external spline) in the middle of min effective and max actual?
RE: involute spline (internal)
i have the drawings for mating splines and on the external spline the circular tooth thickness is given as max effective = 0.0982 and min actual = 0.0953.
then on the internal spline its givin as max actual = 0.1011 and min effective = 0.0982.
what size do use when calculating?
also this mite be obvious but i need to check, on an external spline its the tooth im measuring but on in internal its the gap?
RE: involute spline (internal)
RE: involute spline (internal)
RE: involute spline (internal)
RE: involute spline (internal)
everything on your drawing is correct except the circluar tooth thickness
RE: involute spline (internal)
Just as a helpful suggestion.
if you are wire cutting these splines just because it is drawn correctly does not mean it will automatically be machined correctly.
The choices are it must be either verified with plug or ring gages, or verify each attribute independently like MBW, MOW, Totally Index Error. Involute. lead, & runout. whoever is cutting the parts, it is whole lot easier to maintain tolerances, if there are a set of gages to verify the go & nogo size.
therefore maintaining compliance. without gages it will be more difficult.
if these are blind holes it has now more difficult because now electrodes have to be machined. there are more issues with taper & size.
Mfgenggear
if it can be built it can be calculated.
if it can be calculated it can be built.
RE: involute spline (internal)
I don't know how you come to that conclusion. The handbook says: "Cicular tooth thickness for 16/32 = 0.0918" Measured from my drawing, I get 0.098175". I believe my drawing is exactly on the money.
RE: involute spline (internal)
And because
2*PI [radians] = 360 [degrees]
one can easily convert to degrees if it is necessary...
I also should be more specific earlier:
"Be sure that the circular tooth thickness is measured AS A LENGTH OF AN ARC (on the pitch diameter)".
RE: involute spline (internal)
gauges are outa the question so ill be checking with ball bearings and mics but the sizes are coming off my drawings so another reason why ive gotta draw up in middle tol!
RE: involute spline (internal)
RE: involute spline (internal)
Do not offset an involute as it then is no longer an involute.
Rather rotate it to get the clearance that you need. For slow
speeds, offsetting may work, but for higher speeds, you may run
into problems.