La Puttana ------Build------ Ride her hard, Sell her Cheap

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Super Narrow with killers???
Several more choices page before????






I am looking for the one that screams out!!!!

[gearhead1951]

Since all I can see is the left hand half of the pics I really cant give an opinion , but I have to ask if you looked at the chopper handbook part of this site to see how a girder should be built before you started on this one ??

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I researched it several times????

The bolts were to be at a least 118,000 breaking tensile strength witch the grade 8 are???
The cost me 50$ for the 4!!
I priced hardend shafts 1/2 which would have be .375 threaded bosses and not as strong??
They cost 200$ for them and would have to be built at set length 6in or 8 in!!
The 5/8in with 1/2in bosses that are recomended were more money almost 270$??
I measured a hardened pin shoulder bolts same configuration 1/2 with the .375 treaded bosses at work and measured .495!!
The Grade 8 bolt measured at .495???


I could not get oilite bushings with thrust washers included on one side for the 1/2 so chose to use a oillite ptfe bronze 1/2 bushing and two oilite thrust washers??
They should act in the same manner????
They are 1/8 in thick all three oilite bushings per linkage connection???




I am not sure about the nylon washers I ordered and may part larger ones 1.5in x .020 off on lathe to make larger and spread load across the bushings???





The shock was suppose to be 11.5in in length found on a 250 or simalar model with 200 to 300 lbs force to move 1in in travel??
I will have to admit I only tested this by appling my full body wieght to judge also tested the shock from other and girder and it seemed to have simalar force???
The travel was supose to be idealy 3.5in and these are short 3/4in only because of rubber stops on shock shaft???
This I belive may be may main problem but planned to fix latter by raising the bike the 1in stated in hand book and tacking a mount then testing tell I had a negative 20 degree angle on linkages with out rider???
I may have to try several shocks tell I find one that works????
I had planned to run two shocks but after rereading the chopper handbook relized that I did not have matched pairsand only one would do the work decided to run one???

As for the Girder legs I took it as saying I could build almost unlimited shapes in .120 1in tube as long as there was supported sections to cross the bars???
I will have 38.5 in length and planed to use .250 steel plate as gussets in corners and across the lower linkage mount to front leg?????
The half inch is the extra length it said to account for sweling of rear tire at speed?????
I was going to put a cross bar in too[Maybe] Not sure????


Here is Quote from handbook about the construction of legs???


Quote
Girders appeal to many builders since than can take on so many different shapes and styles, just a few of which are illustrated below in figure 7.15.



Figure 7.15

As mentioned above Girder forks are inexpensive to build. It is entirely possible to buy all of the materials and components for a first class set of forks for under $250 in most parts of the country. Depending upon the techniques and methods of construction very few special tools or equipment are needed and improvisation can lead to many creative solutions to bypass the need for expensive machine work if you’re on a really tight budget. There is also tremendous opportunity for those out there who have access to aluminum casting equipment and some imagination. The sky is the limit as to what a person can come up with.




These are my first set and am willing to throw away and start over if for any reason I have miscalculated or forgoten or overlooked any engineering aspect the handbook says to do??
Or any builder with knowledge tells me I need to do to correct any of my faults???
I had not been putting the gussets or cross bars in the concept drawings just trying to get visilization of which girder leg to procede with??
I was also hoping that if I had faulted that someone would help a young punk kid like me to build himself a fully correctly functioning front girder system???

[Customize IT]

I am sorry I had not relized that the drawings were positioned incorrectly!!!

I will repost the three I am leading towards!!

Thanks and any and all HELP would be greatly appreciated!!!


Concept1






Concept2









Concept3

[Customize IT]

Just for a Bit of FUN today!!!

[Customize IT]

More Fun!!

[jonester123]

Nice work man, looking awesome. I am building a 1979 cb750 Honda chopper with hardtail and springer front end. Good luck

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Thanks!!

I have not the money for a Harley and this bike ran good so under the knife she went again!!

After setting the tank on there I think about anything that will hold fuel will look good!!


I will not start girder legs tell tommorrow!!



Then still have to machine the jig to build legs as match pairs!!!



I have gotten the thumbs up from Gary Weishaupt the writter and author of the Chopper builders Handbook on the engineering of girder so I will be able to move foward without hesitation!!



He is a GREAT GUY!!!!





http://chopperhandbook.com/
For any visitor to find easy!!
and my bible on this!!



Any and all votes will be counted untill then and appreciated!!!!

[Jeff L]

What's the Length on the Bike?

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From outside of front tire to outside of rear tire!!!! Rough estimate by placing the front tire about at place!!


Will be pushing almost exactly 10ft with the new trail number that I have been helped by this great site to find!!!


May be a little under but not by much!!!


Should turn some heads when she does roll!!!

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This is the design I am going to build!!

At least first set???


Gary made some recomendations and also told me that trail was a matter of personal preferance!! Kyrmis the Great man that allowed me to use his trig equations also referanced to this!!

Gary said any number between 2.75in and 4in would be fine and he knew of other builders that used 5in trail numbers with great success!!

I changed the trail slightly to acomendate a turning radius!!!

He also recomended the straight legs so vector of force would be best transfered and since I plan this bike to be a rider I am going to use the design with best posiblities for long term success!!





Here is the design!!









This should represent turning radius!!!

[Customize IT]

Well just went and got the tube for the girder legs!!

I got 32ft of 1in .120 wall for 102$ with the Tax!!!

This will finish the legs if I do not screw up and the handlebars!!

I will have under 250$ in all the tubing with the fuel to get added in!!!

I got it same day as I wanted it and only shipping was the 6 dollars in fuel to get it!!

[Customize IT]

I have been working!!!

I started by turning toproper length and drilliing the mounting locations on the Lathe!!




























Their sizes were dictated by the size of the washers to hold them!!!































The width of the linkages also was made tomatch this size!!!



































A print was made of the fixture!!!

























I then set up a pice of steel on the mill!!































































I then drilled and tapped the holes off the print!!!


























































































































































I scribed the cut location!!!

























With the machining done I stamped the top of fixture plates!!!








































I then test fit plate to trees to see if the links would be parrellel!!











































Fixture done!!!

























I then cleaned my workbench a long overdue thing!!!































I then made the bolts that hold the mounts to fixture!!!

















































Notice the bolts have a sholder to imulate the shafts they will ride on!!!


































I checked the mounts square with the plate!!






































I then scribed the outter locations of the mount locations and used the print to find what overall distance is!!




























I pulled out possible the most protected stright edge in the state!!































I then layed out the girder leg fixture on the table and tacked plates!!!

Failed attempt one where I did not add 1in to length measurement!!!






Tacked one plate down!!








































Used second straight edge to make sure inline with each other!!!









































Measured off 1in for more accurate positioning!!


































My table apparently has a bow in it so shimmed the plate tosquare them upin other axis!!























Checked straight with each other for both legs!!!








































































































When double checking everything found the length wrong!!! They were straight and level with each other but off on length!!
So, cut welds off table and did failed attempt two!!
This time I did not get them square with each other!!! Only 1/16th off!!
But, when you have been building everying to the thousandth 125 of them is a lot!!!






Second attempt!!!





















































































































































After two failed attepts I called in reinforcements for an extra set of hands!!
The man who taught me most of what I know a Millwright by trade and dozens of other tittles that include my father!!

















Third attempt worked and is within 2 thousands of perfectly square!!!























































































































Rechecked my length while waiting for him and this gives me the 1/2inch the handbook says to do!!!























Set up the rotary vise on the mill!!!






























Used the print to get rough cuts with mill done to print lengths!!
All bars were fitted by hand using several grinders!!!



























Made line on tubes put tube in vise and with 1in endmill made cuts with mill and followed print for bothbars!!


















































































Used the tube notcher to make the tubes for center mount!!!!























Just layed tubes on top each other and marked with paint marker and notched the ground to fit and match other leg!!!




























































Showing bars match!!!










































Then remade the center tubes for second girderleg set!!!






























Tacked the legs!!!














































Fipped over and bolted upside down in fixture to make staight and tack other side!!!












































Welded!!!


































































Both legs sections done!!





























Then put on bike to see what I had????


































































































The bike measures at almost perect 9ft 10in!!!













































I put the shock on the lower mount location bolt to see howmuch the shock was effected by the wieght!!
It is actually supporting the bike in next two pics!!


































I have plenty left before this is completed but all the major parts are done now!!

[Indian Mark]

Wow, This is one hell of a great project. I think this is what Gary had in mind years ago when he started this (previous) site.
Nice detail in the posting too!

[Customize IT]

Thanks!!

I just went out and put a 12.5in shock instead of the 11.5in shock on lower link bolt and it sits perfect and even with rider!!!

I am so happy!!!