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  1. #1
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    Default Fabricating a belt drive for applications nobody has on the shelf?

    I got a dividing head and a ball mill to cut the belt grooves for the pulley.. Because it looked like the only way to make such a part. (Planning to use 6061 aluminum.)

    But attaching the pulley to the sprocket shaft on the engine with an adapter concerns me.

    What steel would you use to this? A catastrophic failure here could be horribly dangerous.

    That thing can't come flying off at speed.

    Suggestions?

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    There are several off the shelf motor pulleys that have separate steel hubs, to which the pulley bolts. One of those would be the easy solution.

    If this is for your 45 project, keep in mind that the original sprockets are heat treated (hardened and tempered) to give them enough strength to survive on the tapered and keyed shaft. So, a heat treated chromoly would be the choice here.

    Jim

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    a few yeas back I made a 2'' belt drive for my 45 MAGNUM,
    I bought pully blanks and machined away what I didn't need,
    for the motor end, I just took a 45 engine sprocket,
    I heat treated the teeth area with oxy/acet, then turned the teeth off,
    drilled & tapped it bolted it on, works great
    Attached Thumbnails Attached Thumbnails belt drive 015.jpg   belt drive 016.jpg   belt drive 017.jpg   belt drive 018.jpg   belt drive 019.jpg  


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    the rear pully was held on with a ring of captured bolts welded in the teeth of the basket
    you can see about half of them done here, I think I ended up with 12 bolts in all.
    Attached Thumbnails Attached Thumbnails belt drive 020.jpg   belt drive 023.jpg  

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    Thank you both.. It is a tiny shaft.

    Modifying a stock sprocket does seem to be way too easy.

    Perhaps I'm over thinking this?

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    PS: The belville spring clutch is exactly what I have planned for the rear..

    Nice.

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    they are the best thing you can do on 45 & big twin 4 speed clutches,
    have fitted them on 2 Shovelheads as well & they give you a one finger pull clutch that's real smooth,
    this is one on my 1200
    Attached Thumbnails Attached Thumbnails DSCN1245.jpg  

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    Sexy bit of work! I like the unusual spiral hole pattern too.

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    Yeah.. That is fucking cool.

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    Thanks,
    after I first made it I thought it looked a bit plain,
    so raided my Niece & stole her Spyrograph set so I could get it laid out right....

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    lol

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    Dont overlook adapting an existing kit from something else and then sizing a belt. I looked into this for final drive and primaries and Gates has a interactive design feature last I tried it. CAD type program and then you can select what you need, industrial applications mostly but can work for bikes.

    But depends on what you are using it on. If the HP is not super high, there is affordable Norton kits that gives you a nice clutch and complete belt drive kit. I love belt drives myself...
    On Nortons, I prefer the RGM kits, but Norvil has a good price on most, but the shop owner can be a PIA. Much discussion here,,,
    https://www.accessnorton.com/NortonC...t-drive.16697/

    I love the belt final drives on sporties as well. Chain is a PIA

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    It's for two 45's.. One to a big twin 4 speed, and one to a 6 speed.

    BDL makes one to do the 4 speed, but there's nothing for the 6 speed on the market that I can find.

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    Ok, got it,,, I am no expert on 45s, but I would think some big twin setups would be overkill, But no reason to re-invent the wheel if you can adapt something. I know NOTHING about big twin 6 speeds although in the Buell community is a hot-wet-orgasmic dream to have a 6 speed... Baker Drivetrain makes one but its several thousand dollars.

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