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Author Topic: 1973 scorpion stingerette 290 et  (Read 911 times)

chris r

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Re: 1973 scorpion stingerette 290 et
« Reply #15 on: July 21, 2021, 11:22:48 am »
Rick, I'm thinking out loud here and realize you don't have a mill and lathe, but could you use a hard steel bushing in those rails to end the beating they take? A press fit into the aluminum would eliminate the wear completely.  :)
If you can't look back on your younger self and realize you were an idiot, you're probably still an idiot.

Vintagesleds.com

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    oldcadman

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    • west bend wi.
    Re: 1973 scorpion stingerette 290 et
    « Reply #16 on: July 22, 2021, 12:38:14 am »
    Rick, I'm thinking out loud here and realize you don't have a mill and lathe, but could you use a hard steel bushing in those rails to end the beating they take? A press fit into the aluminum would eliminate the wear completely.  :)

    yes chris, i have talk about this with my brother in law. he owned his own tool and die shop for 36 years until he sold it to some of his employees and retired 5 years ago. he said you could make a hardened bushing a couple of thousands larger then the hole in the rail, heat the rail in a heat treating oven and press it in. i might try something like that down the road.

    here is a pic of one i did not even try to fix.
    1970 scorpion mark II sachs single
    1973 scorpion 400 rv
    1973 scorpion 290 ET
    2006 4 stroke panther
    1972 stinger II 400 r.v.
    1979 scorpion whip 440
    1971 stinger 400
    1970 stinger 400
    never been bitten by a mosquito while snowmobiling

    chris r

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    Re: 1973 scorpion stingerette 290 et
    « Reply #17 on: July 22, 2021, 11:40:30 am »
    As I learned as a young toolmaker, there's always more than one way to do a job, but my thought is a couple thousandths would be too much and split the aluminum at the thinnest point.

    Without the dimensions of the hole location, it could in some cases be difficult to find exact center unless you have a un-damaged part to use for location purposes. If the original hole was close to 50% undamaged, it would be easier to pick up it's location. I'd plunge the closest sized cutter I have into the projected center of the original hole. I would make both rail bushings based on the size it would take to keep as much of the original material as possible as they wouldn't have to be the same size on the 0.D., only on the I.D. Once I had a perfect hole, I'd make the bushing a half thou (.0005") larger 0.D. and push it in with the arbor press. The smaller number wouldn't put so much pressure on the remaining material as the 2 thousandths press fit and since there's no rotation on that part, it would hold up over time.

    If you come to a point where you need to do something, reach out to me and I'd be happy to do some for you. I'm not really far away from your area, N.E. Shiawassee Co.
    If you can't look back on your younger self and realize you were an idiot, you're probably still an idiot.

    oldcadman

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    • west bend wi.
    Re: 1973 scorpion stingerette 290 et
    « Reply #18 on: July 23, 2021, 12:47:03 am »
    As I learned as a young toolmaker, there's always more than one way to do a job, but my thought is a couple thousandths would be too much and split the aluminum at the thinnest point.

    Without the dimensions of the hole location, it could in some cases be difficult to find exact center unless you have a un-damaged part to use for location purposes. If the original hole was close to 50% undamaged, it would be easier to pick up it's location. I'd plunge the closest sized cutter I have into the projected center of the original hole. I would make both rail bushings based on the size it would take to keep as much of the original material as possible as they wouldn't have to be the same size on the 0.D., only on the I.D. Once I had a perfect hole, I'd make the bushing a half thou (.0005") larger 0.D. and push it in with the arbor press. The smaller number wouldn't put so much pressure on the remaining material as the 2 thousandths press fit and since there's no rotation on that part, it would hold up over time.

    If you come to a point where you need to do something, reach out to me and I'd be happy to do some for you. I'm not really far away from your area, N.E. Shiawassee Co.

    thanks for the offer chris, i understand your thought process on this and it makes sense. i was thinking of making my first trip to the a-1 show this year, maybe we can arrange a meeting.
    1970 scorpion mark II sachs single
    1973 scorpion 400 rv
    1973 scorpion 290 ET
    2006 4 stroke panther
    1972 stinger II 400 r.v.
    1979 scorpion whip 440
    1971 stinger 400
    1970 stinger 400
    never been bitten by a mosquito while snowmobiling

    chris r

    • BS Hall Of Fame Member
    • ******
    • Posts: 10203
    Re: 1973 scorpion stingerette 290 et
    « Reply #19 on: July 23, 2021, 10:58:00 am »
    I plan to go to A-1. I'm probably about 20 miles West.
    If you can't look back on your younger self and realize you were an idiot, you're probably still an idiot.

    oldcadman

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    • Posts: 1167
    • west bend wi.
    Re: 1973 scorpion stingerette 290 et
    « Reply #20 on: July 25, 2021, 02:35:56 am »
    even though it was 94 degrees and humid i wanted to get the track cleaned and dyed so i can start the reassembly process after i paint the tunnel. i then went in the air conditioned shop and assembled the para-rail suspension and painted up some modern idler wheels to look like the old scorpion idlers.










    1970 scorpion mark II sachs single
    1973 scorpion 400 rv
    1973 scorpion 290 ET
    2006 4 stroke panther
    1972 stinger II 400 r.v.
    1979 scorpion whip 440
    1971 stinger 400
    1970 stinger 400
    never been bitten by a mosquito while snowmobiling