Standard Spline
Standard Spline
(OP)
I am reverse engineering an internal Spline. It has a major Dia. of: 2.75" (69.88mm), a Minor Dia of 2.574" (32.696mm), and it has a 30° Pressure Angle. I have been unable to find it in the ANSI Standards. Can anyone confirm weather or not this is a custom Spline, any advice or direction would be appreciated
Cheers,
Aaron
"The Liver is Evil it must be Punished"
Cheers,
Aaron
"The Liver is Evil it must be Punished"





RE: Standard Spline
what is the #teeth, fillet or flat root
RE: Standard Spline
RE: Standard Spline
are you sure this is a spline?
can you take a base pitch measurement.
cord accross 2 & 3 teeth and subtract the diff.
do yo have a optical comparator?
measure the approx. circular pitch?
RE: Standard Spline
RE: Standard Spline
according to base pitch charts
.338 base pitch = 9DP 14.5 Deg PA
.329 base pitch = 2.75 Mod 14.5 Deg PA
to be absolutly sure, is there a gear shop in your area?
have them run an Involute chart.
The involute will be straight if the pitch & pressure angle are correct.
That is the best way to verify the spline or gear geometry.
I have made custom gear geometry that are used for a splines.
RE: Standard Spline
RE: Standard Spline
Nacho i google it, standard 2.25 Mod 30 Deg PA
Need more Info on your question?
Take care
RE: Standard Spline
Google
"70mm spline" gets 7 hits
"2.75 spline" gets 1 hit
are you sure it's not ISO?
2.574" = 65.379mm
32.696mm is the radius?
RE: Standard Spline
.5, (0.75), 1, (1.25), 1.5, (1.75), 2, 2.5, Etc . .
One of my previous colleagues. Described the External Mate to this Gear/Spline, as Class 2.25. Which is not in my copy of GB3478.1-83, however my dimensions do put my gear in between 2, and 2.5
RE: Standard Spline
it appears the base pitch submitted is off.
this appears to be a profile, reduced gear.
25.4/2.25= 11.2888889 DP
30+1/11.28889DP= 2.74606299 OD
however the only way to verify it is to check it in an Involute Machine.
Duncan
not sure about your statement.
I googled the GB3478.1-83 because I do not have this spec.
it the reply obtained was 2.25M 30 PA
RE: Standard Spline
RE: Standard Spline