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  • Snowmobile Spline

    Arctic Cat Thundercat Spline on Jack Shaft. Does any one know anything regarding these? Are they Involute Spline like a 30 degree stub .I dont know much about Splines. I thought first it was a straight 30 degree type but..almost looks a bit .Anyhow any Info would be good. Thanx Guys

  • #2
    I haven't dealt with splines in quite a while. I've seen straight and involute on a number of different applications.
    With snowmobile jack shafts, given the high torque that they now produce I'm sure they are all involute to maintain a better line of contact.
    Also probably metric. The only way to tell is take it out and pull some measurements.
    Straight splines seem to be a thing of the past. I have some old lawn mower shafts that are straight spline.

    JL............

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    • #3
      What's a snowmobile?

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      • #4
        I don't know but when I made one out of 7075, I just ground up a cutter to fit the profile..

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        • #5
          Originally posted by CCWKen View Post
          What's a snowmobile?
          It's something that we used to ride around on in the winter in Michigan but nowadays you need to go to Canada most of the time or put wheels where the skis go.
          OPEN EYES, OPEN EARS, OPEN MIND

          THINK HARDER

          BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

          MY NAME IS BRIAN AND I AM A TOOLOHOLIC

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          • #6
            May be worth trying an agricultural machinery supplier, there are a lot of standard splined sockets and shafts for tractor PTOs, cheap too!

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            • #7
              The splines are straight as parallel with shaft,the one in the pic is ones used in the Thundercat era 7/8" in dia.

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              • #8
                Just guessing ... but the way that the mill cutter emerged from the full depth cut in an "arc shape" would indicate an involute form. An exit in a rectangular form would indicate a straight tooth form. Does this sound right??

                Joe B

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                • #9
                  Originally posted by JoeCB View Post
                  Just guessing ... but the way that the mill cutter emerged from the full depth cut in an "arc shape" would indicate an involute form. An exit in a rectangular form would indicate a straight tooth form. Does this sound right??

                  Joe B
                  Sounds right to me.
                  “I know lots of people who are educated far beyond their intelligence”

                  Lewis Grizzard

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                  • #10
                    Originally posted by JoeCB View Post
                    Just guessing ... but the way that the mill cutter emerged from the full depth cut in an "arc shape" would indicate an involute form. An exit in a rectangular form would indicate a straight tooth form. Does this sound right??

                    Joe B
                    Originally posted by Dave C View Post
                    Sounds right to me.
                    Sorry Guys not familiar with terminology of different splines.

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                    • #11
                      Originally posted by Tundra Twin Track View Post
                      Sorry Guys not familiar with terminology of different splines.
                      As in, do the raised parts look like a small gear when you look at the end, or do they look like a series of straight keys around the shaft. I was thinking involute from the picture as well but didn't realize what was triggering that until Joe pointed out the traces left from the cutter.
                      .
                      "People will occasionally stumble over the truth, but most of the time they will pick themselves up and carry on" : Winston Churchill

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                      • #12
                        Originally posted by TGTool View Post
                        As in, do the raised parts look like a small gear when you look at the end, or do they look like a series of straight keys around the shaft. I was thinking involute from the picture as well but didn't realize what was triggering that until Joe pointed out the traces left from the cutter.
                        Yes it looks like a gear,thanks.

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                        • #13
                          Originally posted by TGTool View Post
                          As in, do the raised parts look like a small gear when you look at the end, or do they look like a series of straight keys around the shaft. I was thinking involute from the picture as well but didn't realize what was triggering that until Joe pointed out the traces left from the cutter.
                          Could be also straight-sided but trapezoidal shape? "exit wound" looks a bit arc shaped but really hard to say from picture.
                          Trapezoid and involute tooth can look quite similar on a quick glance.

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                          • #14
                            Hmm Took a while ha ha But i made 3 of them now. Came out Ok . Actually Fit very well. Was Involute form . Quite a learning Experience for Myself. Thanx for all the Help

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                            • #15
                              That's an excellent piece of gear cutting, his worship would be proud of you.

                              Regards Ian.
                              You might not like what I say,but that doesn't mean I'm wrong.

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