×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Need standard frame specs for a Harley(1975-03)
5

Need standard frame specs for a Harley(1975-03)

Need standard frame specs for a Harley(1975-03)

(OP)
I am constructing three new custom choppers and instead of buying prefabbed frames, I want to stretch my own. All I need is the standard measurements of a Harley softail frame to get me started. I am hoping someone out there may be able to help me.I have considered going to a local service shop and looking at a stripped frame but decided to start here first.

RE: Need standard frame specs for a Harley(1975-03)

Constructing frames from scratch is a very tricky business. Have you considered the liability you would have to assume if your frame broke?

I'd suggest you approach some of the aftermarket manufacturers. They may already make a frame like you want, or one you could stretch. They could also provide the critical dimensions, which would be a lot easier than trying to get them off a bike on a shop floor.

Look at some of the mags, like American Iron or Hot Rod Bikes, etc. to pick up some names.

RE: Need standard frame specs for a Harley(1975-03)

2
(OP)
Liability issues are not a current concern with the bikes mentioned and I am avid chopper mag reader. Thanks for the reply.Still need the measurements though.

RE: Need standard frame specs for a Harley(1975-03)

2
Here's a link to the motor mount dimensions,

http://64.172.168.34/neatstuff/motor-trans-mount.htm

But for the most part it is loads easier to beg, borrow, or whatever it takes, a Softail frame and build a jig off of that with the adjustability you need built into the jig.

If you have a local powdercoater you could try this. Assuming the powder coaters is reasonable you could offer to pay for the powder if one of their customers would lend you the frame?

I've tried to get factory drawings through my dealer, and never had a lot of luck. But from experience I can tell you that factory frames are all over the place. So maybe that's why it's so hard to get the factory drawings?

Mine has adjustable tranny mount fixtures on the jig so I can build offset into the tranny mounts which saves buying an offset plate.

Another thing to consider is that if you're using stroked motors then there can be clearance issues with the stock frame, which already has clearance issues as witnessed by all the flats pressed in to the tubes!

Not a lot of help I know but Hey! at least it's something.

RE: Need standard frame specs for a Harley(1975-03)

I helped reverse engineer jesse rookes first frame, "Dinah".  He built it first, and then wanted to make a CAD model so he could make accuurate dupplicates of the chassis.  

http://www.jesserookecustoms.com

painstaking measurments and on the fly fabrication is how it is done!  

I used straight edges, squares, calipers, micrometers, and an angle-meter.  It took about five nights to measure out the frame.  Then it took another week to model up the frame in several variation in CAD.  If a measurement was found to be off or fined tuned during fabrication...the parametric model was changed to reflect that.  Hope that helps.

Regards,

Dion
P.S. I still have CAD models of the frame but under and NDA can not share files.  Sorry!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close