origbiscuit
Mechanical
Hi everyone. I am a new member here, and wow what a great resource this site is.
Need some help. I need to specify a JIS external spline for quoting a small diameter drive shaft (outdoor power equipment). The shaft must interface with a Japanese gear case, which has the following for required external splines (to mate with the internal splines of the gear case):
Spline Std: JIS
7mm x 7 teeth x .75mm module
shifted modules = +.967mm
profile = low teeth
PA = 20 deg.
pitch diam = 5.25
measurement over pins = 7.926-.087/-.144 (1.40 mm pin)
The above info is from the gear case supplier. I am trying to get more detailed info from them (e.g. recommended fit class, recommended hardness, etc.). But in the mean time I need to release a drive shaft drawing for quotation. I would like to draw the splines with a simple representation.
* What would the "root" diameter be?
* What would the "outer" diameter be?
I did search and saw that there is downloadable programs for calculating the detailed dimensions of the tooth profile... however my IT dept will not allow outside programs.
Thanks in advance... this is my first experience working on a detailed level with splines. Also:
* What is meaning/definition of the term module?
* What does the shifted module mean? I read in a previous post that this is a modification to the involute profile of the tooth... but what is changed by this value?
Need some help. I need to specify a JIS external spline for quoting a small diameter drive shaft (outdoor power equipment). The shaft must interface with a Japanese gear case, which has the following for required external splines (to mate with the internal splines of the gear case):
Spline Std: JIS
7mm x 7 teeth x .75mm module
shifted modules = +.967mm
profile = low teeth
PA = 20 deg.
pitch diam = 5.25
measurement over pins = 7.926-.087/-.144 (1.40 mm pin)
The above info is from the gear case supplier. I am trying to get more detailed info from them (e.g. recommended fit class, recommended hardness, etc.). But in the mean time I need to release a drive shaft drawing for quotation. I would like to draw the splines with a simple representation.
* What would the "root" diameter be?
* What would the "outer" diameter be?
I did search and saw that there is downloadable programs for calculating the detailed dimensions of the tooth profile... however my IT dept will not allow outside programs.
Thanks in advance... this is my first experience working on a detailed level with splines. Also:
* What is meaning/definition of the term module?
* What does the shifted module mean? I read in a previous post that this is a modification to the involute profile of the tooth... but what is changed by this value?