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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #11  
Old 20th July 2014
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Quote:
Originally Posted by mrmom9r View Post
Inside to inside is 9 1/4".

The parts are pretty.
Quote:
Originally Posted by DR DICK View Post
nine point three seventy five.
according the fsm neither of us know the short frame dimension.
from 69< manual.

from the 70> manual


though if you measure many drum brake swing arms you will find most do fall in close to 9.25"
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  #12  
Old 20th July 2014
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Thanks for the pictures Dr. Dick. The long arm is the specs I need. As far as differences between 9.25" and 9.375"; I'm sure there's enough 'spring' in the hard tail legs to compensate and shimming is always a requirement since differences due to manufacturing processes, age, wear, use (and abuse) can tweek any part from it's blueprint specs.
After all; this is a Harley, not a grand piano.
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  #13  
Old 20th July 2014
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Originally Posted by JonesL View Post
Thanks for the pictures Dr. Dick. The long arm is the specs I need. As far as differences between 9.25" and 9.375"; I'm sure there's enough 'spring' in the hard tail legs to compensate and shimming is always a requirement since differences due to manufacturing processes, age, wear, use (and abuse) can tweek any part from it's blueprint specs.
After all; this is a Harley, not a grand piano.

Nice parts, thought of making anymore?

PS. I'd be willing to bet that AMF made grand pianos at some time in their past. Tennis rackets to water softener systems meekly carried the AMF seal of
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  #14  
Old 20th July 2014
JonesL JonesL is offline
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hcrashster,

Don't think I'll be making too many of these parts. They're one-offs specifically dimensioned to fit my particular project, machined without the benefit of anything even remotely resembling CAD. Heck, just slabbing off the rough billets is an ordeal. My donor stock is a diesel locomotive axle; domestic, 1050 steel, ultrasounded flaw free, and super heavy.

Ah AMF... where quality is our number one dream.
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  #15  
Old 11th August 2014
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Default Project frame progress

Finished my axle plates and started dry fitting the frame for my Sportster-powered board track replica.

Last edited by JonesL; 1 Day Ago at 21:27..
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  #16  
Old 11th August 2014
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Using .120 DOM?
And where is the other down tube?
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  #17  
Old 11th August 2014
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Looks great.
Where did the castings come from ?
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  #18  
Old 11th August 2014
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Looks great.
Where did the castings come from ?
That's what I thought the first time I saw them in another thread. The real story is waaaay better than some casting that he ordered. I'll let Jonsey tell the story of his "castings".

Jones - the frame is turning out quite interesting. All the "castings" look right at home. Can't wait to see it all come together.

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  #19  
Old 12th August 2014
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they look more like fabricated,then cast. that's a,very tall frame.
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  #20  
Old 12th August 2014
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do you have a sketch or a picture similar to what your goal is?
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