Girder Build help

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Drake9
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SELF INTRODUCTION: I am active duty USAF and have built a 81 Ironhead chop. I have the bike building bug and I dont want to shake it. Here to learn as much as I can and hopefully give advise to some others as well. I recently picked up a 71 Triumph 650 basket case motor from a good buddy for pretty cheap. I plan on getting that thing built then building a motorcycle around it. Not 100 percent sure on the direction I am going to go with it but it should be fun and keep me busy. I also enjoy building my own tools when I can. I have picked up most the metal to build a tube bender and have plans to build my own porta-band stand and lift.

Girder Build help

Post by Drake9 » Mon Oct 08, 2012 12:10 am

Well, I was thinking about building a springer for my current build but changed my mind. I think a girder might fit the build better and the springer I want to build will go better on a longer bike I think. The bike I am putting this on is an 81 Ironhead Chop and it has a minimalist approach so the weight is not to much.

I am getting ready to purchase the material to start the build but have some questions.

In Gary's plans it says to use .134 wall DOM but cant seem to find it for sale. Will .120 be good enough or should I go thicker? I would like to keep it as light as possible but still strong.

I am going to use flat links and in the plans it has a different set of yokes to use with the flat links but I cant seem to figure out why. Can someone shed some light on that? The ones for flat links keep everything tighter to head tube and the plate is 1" instead of .625". Like I said trying to keep this thing as light as possible.

Also can someone shed some light on figuring trail and girder length? I got draft sight and trying to learn how to use it but havent had much luck.

I will keep you posted as I make progress

Thanks
Jake

Drake9
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Posts: 14
Joined: Wed Feb 15, 2012 12:26 am
SELF INTRODUCTION: I am active duty USAF and have built a 81 Ironhead chop. I have the bike building bug and I dont want to shake it. Here to learn as much as I can and hopefully give advise to some others as well. I recently picked up a 71 Triumph 650 basket case motor from a good buddy for pretty cheap. I plan on getting that thing built then building a motorcycle around it. Not 100 percent sure on the direction I am going to go with it but it should be fun and keep me busy. I also enjoy building my own tools when I can. I have picked up most the metal to build a tube bender and have plans to build my own porta-band stand and lift.

Re: Girder Build help

Post by Drake9 » Mon Oct 08, 2012 2:41 am

Should have ready more of the build guide before posting up. I got some answers but created more too, haha.

It looks like I can use the .120 wall without any issues as this will be a short front end. The stock hydraulic forks have been shortened 2" to give you an idea.

As for the yokes, if I read the guide right I can use the pivot point on the yokes to change the angle of the forks to give the bike a longer look. If I wanted to do this would I put the top pivot point closer to the stem then the bottom. It looks like in the plans it has the lower one closer. I might just get some wood or something and start cutting that up and do a mock up.

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budoka
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SELF INTRODUCTION: I'm a Kentucky boy who's found himself transplanted into Japan. been into turning wrenches as long as i can remember. i love muscle cars, hotrod bikes, and the martial arts.

been a member of this board since back when it was a part of Chopperweb. been handling the tech side and sharing the admin duties for several years now.
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Re: Girder Build help

Post by budoka » Mon Oct 08, 2012 4:04 am

actually, to help play with trail numbers, i can highly recommend a program for windows called TrailSym written by none other than our very own Rudedog. i'll email it to ya. it works with springers, girders, and regular old telescopic forks, too.

on the yoke pivot points, i believe you could move either and be just fine, just be sure you're not causing something to hit something else by doing so. keep in mind the whole build and the stuff that needs to go on later like the shock/spring mounting points.

i definitely think doing a mockup before jumping into the real thing will help you out tremendously.

good luck!
-dan
-experience is a wonderful thing. It enables you to recognize a mistake when you make it again.
http://knuckleheadsummer.blogspot.com/

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budoka
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Joined: Thu Jul 21, 2011 12:51 pm
SELF INTRODUCTION: I'm a Kentucky boy who's found himself transplanted into Japan. been into turning wrenches as long as i can remember. i love muscle cars, hotrod bikes, and the martial arts.

been a member of this board since back when it was a part of Chopperweb. been handling the tech side and sharing the admin duties for several years now.
Location: Yamanashi Shi, Japan
Contact:

Re: Girder Build help

Post by budoka » Mon Oct 08, 2012 4:09 am

shoot, i forgot that gmail won't let me send a zip file. i'll email you a link to it.

-dan
-experience is a wonderful thing. It enables you to recognize a mistake when you make it again.
http://knuckleheadsummer.blogspot.com/

kheaton
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SELF INTRODUCTION: My name is Ken Heaton. I've been in the medical field in the Army for the past 18 years and work on and build bikes as a hobby. My main hobby and goal is to think of parts that do not exist and make them or modify existing parts. I currently own a 99 Softtail that I bolted together, a 78 Triumph bobber that i built from the ground up, a 75 CB360 cafe, and a 76 Kawasaki KH500 that needs a lot of work. I joined the original forum about 8 years ago and I'm glad to see it up and running again!
Location: Augusta, GA

Re: Girder Build help

Post by kheaton » Mon Oct 08, 2012 9:54 am

Can I get a link too!

Drake, I had the same prob with tube sizes in my area. None of the supply houses had it but I went to a welding/fab shop and they were able to get it next day and was cheaper than if I ordered it.

Ken

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BIGJIM
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Re: Girder Build help

Post by BIGJIM » Mon Oct 08, 2012 12:02 pm

HERE IS THE LINK AS HOSTED BY CHOPPERWEB

Thank Rudy

FULL INSTALL:

Download here http://www.chopperweb.info/forum/pics/T ... ll_v11.zip

Instructions:
1. Create a temp directory to unzip this file since several dependancy files will be unzipped. You can use your Download directory, but it will get clutered with these files.
2. Run the "setup.exe" and follow the instructions. If any files are flagged as replacing a newer file, use the newer file and do not install the older file. You will be prompted during the installation.

Feedback is appreciated.

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hdwgfx
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Re: Girder Build help

Post by hdwgfx » Mon Oct 08, 2012 12:47 pm

Motivation ;-) One version of Clem Johnson's famous Nitro Barn Job Vincent drag bike with a girder... I believe this is @ 1965 9.52 et 151.51 mph
BarnJob.jpg
BarnJob.jpg (160.44 KiB) Viewed 2102 times
http://nostalgiaonwheels.blogspot.com/2 ... -drag.html
NOTW

Drake9
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Posts: 14
Joined: Wed Feb 15, 2012 12:26 am
SELF INTRODUCTION: I am active duty USAF and have built a 81 Ironhead chop. I have the bike building bug and I dont want to shake it. Here to learn as much as I can and hopefully give advise to some others as well. I recently picked up a 71 Triumph 650 basket case motor from a good buddy for pretty cheap. I plan on getting that thing built then building a motorcycle around it. Not 100 percent sure on the direction I am going to go with it but it should be fun and keep me busy. I also enjoy building my own tools when I can. I have picked up most the metal to build a tube bender and have plans to build my own porta-band stand and lift.

Re: Girder Build help

Post by Drake9 » Wed Oct 10, 2012 2:45 am

That is great inspiration, thanks for posting it. I have a MAC and I am not running a virtual machine yet. I will get that set up so I can check out that program. Thanks guys

TattooLeeRoy
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SELF INTRODUCTION: Hi. I am LeeRoy, been biking for 30 yrs now. I ride an ironhead sportster, and (since I have a rider) am wanting to start a ground up build. I am really happy I found CBH, and want to thank you for info it contains. I look forward to the sportster hardtail article, and hope for a girder article
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Re: Girder Build help

Post by TattooLeeRoy » Wed Oct 10, 2012 1:48 pm

I second the mock-up. Wood and mdf work great and are fairly inexpensive. You can address a lot of questions and issues that way on the cheap.
We can do anything, impossible just takes longer.

Drake9
NewB
Posts: 14
Joined: Wed Feb 15, 2012 12:26 am
SELF INTRODUCTION: I am active duty USAF and have built a 81 Ironhead chop. I have the bike building bug and I dont want to shake it. Here to learn as much as I can and hopefully give advise to some others as well. I recently picked up a 71 Triumph 650 basket case motor from a good buddy for pretty cheap. I plan on getting that thing built then building a motorcycle around it. Not 100 percent sure on the direction I am going to go with it but it should be fun and keep me busy. I also enjoy building my own tools when I can. I have picked up most the metal to build a tube bender and have plans to build my own porta-band stand and lift.

Re: Girder Build help

Post by Drake9 » Sat Oct 13, 2012 12:53 am

So has anyone ever built an aluminum girder? The yokes would be steel but thinking aluminum tubing for the legs either that or use 7/8 DOM steel, any thoughts?

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railroad bob
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Re: Girder Build help

Post by railroad bob » Mon Jan 21, 2013 2:08 am

This has been talked about in other threads. If you are considering using alum to save weight, don't bother.
The amount you save is very minimal, and the strength and stiffness you lose is considerable.
Alaska - Land of the Individual and Other Endangered Species
An Armed Society is a Polite Society,...
Politicians Prefer Unarmed Peasants
Principle of 7 P's: Proper Prior Planning Prevents Piss Poor Performance

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