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Thread: Tri-z clutch covers

  1. #1
    Join Date
    Mar 2017
    Location
    Antrim county, MI
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    38

    Tri-z clutch covers

    I know several people have looked into having the tri-z clutch cover reproduced over the years, but nothing has made it to market yet. I've been talking it over with the manager at the machine shop I work at, and I have a green light to begin drawing up a solid cad model on my own time(after hours). As soon as I can bribe our Q.C. guy to stay late for a little bit, I'll throw a good cover on the C.M.M. and beep in all the bolt and dowel locations, along with all major features and the the gasket surface profile.
    I'll be making these out of T6 or T7 billet aluminum. There will be quite a few revisions to the cover. I should be able to thicken all of the walls and increase all internal corner radii for strength. I personally hate the oil check bolt, so I'll likely install a sight glass from a master cylinder in it instead. To help eliminate extra set-ups and machine time, I won't be putting in any provisions for a powervalve(sorry guys).
    With the arrangement I have with my employer, I would be buying all material myself and pay the shop for machine time. I would have to do all machine work on my own time, and when there is a machine open/available. With all that said, I hope to be able to buy the material needed for fixture plates and a half dozen or so covers by spring. Unless complications pop up, the price for these covers would be $300.
    It will take a while before I have any finished parts. After 1 or 2 are made and I have a chance to streamline my program, I should be able to make around a dozen or so a month. I just wanted to give the tri-z crowd a heads up.

  2. #2
    Join Date
    Mar 2017
    Location
    Antrim county, MI
    --
    38
    Click image for larger version. 

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    It's not much progress, but at least it's forward progress. I should be able to have my CAD model finished next week. I'm in the process of learning to use Fusion 360į CAD/CAM software after 10yrs. of using Mastercam.
    I'm still not sure how long it will be before I can order material, or how much it will cost yet. After some scrounging around the shop, I came up with some scrap steel that I can clean up and use to make fixture plates.
    I'll post more pics when the CAD model is finished, but I'll probably have to wait till after christmas to order material.

  3. #3
    Join Date
    Nov 2003
    Location
    Columbia
    --
    5,137
    Hey that's fantastic. Good job on it man.
    My feedback: http://www.3wheelerworld.com/showthr...k-for-ATC-Eric

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  4. #4
    Join Date
    Mar 2017
    Location
    Antrim county, MI
    --
    38
    Thankyou for the kind words. I just finished the cad model today. It's a big step in the right direction.Click image for larger version. 

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  5. #5
    Join Date
    Oct 2018
    Location
    WI
    --
    1
    This is awesome. I'm in in for one for sure. Maybe two.

  6. #6
    Join Date
    Apr 2011
    Location
    Mexico
    --
    8,380
    Good on you for taking this on.

    If itís not too late please allow for a little extra space for a Talon clutch basket to fit. The stock clutch can rub when it gets worn and the Talon baskets require that you grind the two ribs at the top of the cover in order to use it.

    Removing those ribs and extending the inside of the face of the cover 1 or 2mm would fix the issue.

    Good luck!!!

  7. #7
    Join Date
    May 2006
    Location
    N.E. Ohio
    --
    1,983
    ^^^I’ll second that and raise you a 2piece quick change cover. Site glass is a waste of time IMO. It’s a quart of oil and changed often(if you ride it). The ability to change the clutch without removing the kicker and the entire side cover would be the HOT ticket. Make it so #1

  8. #8
    Join Date
    Mar 2017
    Location
    Antrim county, MI
    --
    38
    According to all my measurements, the factory clutch basket has about .085in clearance to the two inner ribs on the clutch cover. This is the tightest point I can find. A Talon clutch basket would have about .04in of clearance at these ribs on a stock cover. This problem is made a little worse by the fact that both the factory clutch basket and cover have a taper, or draft angle built in so they can be pulled from the mold. Both the Talon basket and my cover will have straight walls. My cover with a Talon basket should have about .091in clearance to the tightest point, this point being one of the cover mounting bolt bosses in the basket pocket itself.

    As far as the sight glass, that's really my preferance. I hate having to pull out a bolt just to check the oil level. Draining and refilling isn't any better of a system when you just want to check the oil level.

    A quick change clutch cover would be nice, but will add to machine time, setup time, material costs and overall part cost. I may play with a quick change cover if I am able to get my own cnc machine in the next year or so. Due to paying the shop I work at for actual machine time, I need to keep my run times as low as possible.
    It may not look like it, but I currently have about 100hrs in dimensioning and drafting that cad model.

  9. #9
    Join Date
    May 2006
    Location
    N.E. Ohio
    --
    1,983
    Don’t discount expansion to the basket at running temps under load, might be slight. Just something to ponder.

  10. #10
    newby200x's Avatar
    newby200x is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Sep 2012
    Location
    Indiana
    --
    440
    I sure wish I had access to a 3D scanner or CMM. I use Solidworks every day for 3D CAD work, so it's no problem for me to do some 3D modeling. Reverse engineering some of these complex parts would be the big task, but it sure would be fun to reproduce some of these harder to find parts. I applaud what you are doing here.

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