• 11-29-2012
    fishcreek
    Beautiful work by the way
  • 11-29-2012
    Mr.Magura
    Quote:

    Originally Posted by icantdrive65 View Post
    Were the cutouts triangular like mine? How long did it take for the chainring to fail?

    [/IMG]

    It looked very similar.

    It failed first time it hit a log.

    It looked good though till it failed.


    Magura :)
  • 11-30-2012
    cdn-dave
    Quote:

    I'll ask my drawing guy if there is a shortcut, and post it if he has something up the sleeve.
    I couldn't make a CAD drawing if my life depended on it. He is on the other hand quite good.
    When I made mine, I just had the numbers on a Post-It. Not the way it's going to be in the future. Made like 3 or 4 that way.
    I downloaded some sprocket files from here to get me started:
    CAD files Chain wheels

    Still talking with the laser cutters - they won't do any machining, think flat 2.5mm will work?
  • 11-30-2012
    Mr.Magura
    Quote:

    Originally Posted by cdn-dave View Post
    I downloaded some sprocket files from here to get me started:
    CAD files Chain wheels

    Still talking with the laser cutters - they won't do any machining, think flat 2.5mm will work?

    That's in a terrible language, and they want me to make a user ?? ;)
    Any chance we can exchange those files as emails?

    If you just have them made according to the thickness you need the teeth (8-9-10sp), and make the rest of composites, you're good to go.


    Magura :)

    EDIT: I just spoke to my drawing guy, but forgot to ask.....
  • 11-30-2012
    cdn-dave
    Quote:

    Any chance we can exchange those files as emails?
    Sure, send me a pmail with what you need (# teeth, file format). Right now I've got 32/33/34 teeth in ProE format.

    I'm building for a singlespeed with a 3/32" (2.3mm) chain, so if that's tight I'll either file the teeth the 0.2mm or throw on a 1/8" (3.2mm) chain.

    @icantdrive - how did you figure out the height/squareness of the teeth and how does it perform? I rounded mine off (in CAD)
  • 11-30-2012
    Mr.Magura
    Quote:

    Originally Posted by cdn-dave View Post
    Sure, send me a pmail with what you need (# teeth, file format). Right now I've got 32/33/34 teeth in ProE format.

    I'm building for a singlespeed with a 3/32" (2.3mm) chain, so if that's tight I'll either file the teeth the 0.2mm or throw on a 1/8" (3.2mm) chain.

    @icantdrive - how did you figure out the height/squareness of the teeth and how does it perform? I rounded mine off (in CAD)

    I could hardly imagine 2.5mm would be an issue with a 3/32" chain. I have made mine 2.4 as I recall. The height/ squareness, is a matter of entry/exit angle of the chain.
    In a cad system, the easy way is to draw a chain on the smallest rear you intend to use it with. Then you can see if the edges collides on entry/exit.

    You got a PM in 5. Thanks.

    Magura :)
  • 11-30-2012
    icantdrive65
    Quote:

    Originally Posted by cdn-dave View Post
    @icantdrive - how did you figure out the height/squareness of the teeth and how does it perform? I rounded mine off (in CAD)

    I just copied what is already out there and working. It works great so far. I have not had much chance to test it out since the first ride. We are getting hit with a pretty decent storm right now.
  • 11-30-2012
    NEPMTBA
    Are you cutting these from sheet stock or off the end of a billet?

    Reason I ask if sheet stock where are you getting your supplies. I need a new supplier for making skid pans for Moto Trials bikes! Mine has stopped stocking sheet aluminum, I guess the race car business dropped off for him.

    On another note, love your designs so far, the bash guard is beefy and should handle a lot of abuse. :thumbsup:

    Thanks
  • 11-30-2012
    icantdrive65
    Quote:

    Originally Posted by NEPMTBA View Post
    Are you cutting these from sheet stock or off the end of a billet?

    Reason I ask if sheet stock where are you getting your supplies. I need a new supplier for making skid pans for Moto Trials bikes! Mine has stopped stocking sheet aluminum, I guess the race car business dropped off for him.

    On another note, love your designs so far, the bash guard is beefy and should handle a lot of abuse. :thumbsup:

    Thanks

    Thanks. I have just been using 1/8" 6061 sheet that I have on the shelf. I am having trouble finding a supplier for thin 7075 sheet. At least an affordable one.
  • 11-30-2012
    Mr.Magura
    Rio Tinto Alcan - Home Page

    Those are the guys we call Alusuisse around here. They got anything you can imagine, and then some.

    Magura :)
  • 12-03-2012
    icantdrive65
    Quote:

    Originally Posted by Mr.Magura View Post
    It looked very similar.

    It failed first time it hit a log.

    It looked good though till it failed.


    Magura :)

    The question is: Do people want a lightweight chainring or do they want one that stands up to abuse? Aren't bash guards for people who want to grind logs and rocks? Just trying to find the balance. Now I want to mount it on the XXIX without a bash guard.

    I took the lightweight ring out for a spin on my Blur today. I forgot what it's like to shift from the granny gear to the middle without all the pins and ramps on modern chainrings.:D
  • 12-03-2012
    Mr.Magura
    Quote:

    Originally Posted by icantdrive65 View Post
    The question is: Do people want a lightweight chainring or do they want one that stands up to abuse? Aren't bash guards for people who want to grind logs and rocks? Just trying to find the balance. Now I want to mount it on the XXIX without a bash guard.

    I took the lightweight ring out for a spin on my Blur today. I forgot what it's like to shift from the granny gear to the middle without all the pins and ramps on modern chainrings.:D

    True. I just don't like stuff that breaks if you look at it wrong.
    I know for a fact, that loads of the people on MTBR don't care, as long as it's light.
    I just gave you my experience. I didn't say it was bad or wrong.
    Personally, I just hate when equipment fails, thus that design went in the bin real quick.


    To get reasonable shifting, just mount 3 or 4 pins, that helps a lot.


    Magura :)
  • 12-03-2012
    sasquatch rides a SS
    If anybody needs any testing done on their chainrings I would gladly do the job for you :)
  • 12-04-2012
    Mr.Magura
    Quote:

    Originally Posted by sasquatch rides a SS View Post
    If anybody needs any testing done on their chainrings I would gladly do the job for you :)

    That's mighty generous of you, thanks for the offer.

    Where do I send the first 10? :D


    Magura :)
  • 12-04-2012
    ozzybmx
    You are a prime candidate to take on HBC's client list.... have a go at a 29t spiderless middleburn and i'll send you some cash and test it for you ;)
  • 12-04-2012
    Mr.Magura
    Quote:

    Originally Posted by ozzybmx View Post
    You are a prime candidate to take on HBC's client list.... have a go at a 29t spiderless middleburn and i'll send you some cash and test it for you ;)

    I hope you meant Icantdrive and not me ;)


    Magura :)
  • 12-04-2012
    ozzybmx
    I dont mind who wants to make them, i'll send the cash anywhere :D
  • 12-04-2012
    Mr.Magura
    Quote:

    Originally Posted by ozzybmx View Post
    I dont mind who wants to make them, i'll send the cash anywhere :D

    In that case I can inform you, that you were writing to Icantdrive65 :D



    Magura :)
  • 12-04-2012
    ozzybmx
    I was aiming it at him but just in case you were thinking about it.... put me down as your first customer ;)
  • 12-04-2012
    sasquatch rides a SS
    Quote:

    Originally Posted by Mr.Magura View Post
    That's mighty generous of you, thanks for the offer.

    Where do I send the first 10? :D


    Magura :)

    10? :eekster:

    I'd gladly test 1 :cool:
  • 12-05-2012
    icantdrive65
    Quote:

    Originally Posted by sasquatch rides a SS View Post
    If anybody needs any testing done on their chainrings I would gladly do the job for you :)

    BCD and tooth count? I could use some outside R&D. I have been riding the lightweight ring on both of my bikes, but can't get out much between rainstorms for the last week.
  • 12-05-2012
    icantdrive65
    Quote:

    Originally Posted by ozzybmx View Post
    You are a prime candidate to take on HBC's client list.... have a go at a 29t spiderless middleburn and i'll send you some cash and test it for you ;)

    One speedbump I am running into is that I don't have all of these different cranksets to measure and test fit for splined chainrings. I honestly don't know much about them.

    I do have an old XTR crankset circa ~2000-2002. Too bad those are out of vogue.
  • 12-26-2012
    icantdrive65
  • 12-26-2012
    123elizxcvbnm
    That middle one is beautiful!!
  • 12-26-2012
    Nrs1Rider
    Those rings are beautiful.