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  #16 (permalink)  
Old 06-15-2015, 04:31 AM
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Springer parts cut by waterjet.

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  #17 (permalink)  
Old 06-15-2015, 06:52 AM
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Looks good. An ambitious project for the 1t time. Good luck.
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127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech FL 2014/2019 bobber
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  #18 (permalink)  
Old 06-20-2015, 03:24 AM
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Hi guys, I've hit my first road block, I have a guy who makes springs for my dad's firm and offered to make me a free set for my springer, but the drawing I have doesn't state all the dimensions. Any one have a drawing of the springs I could use to fab them up?
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  #19 (permalink)  
Old 06-20-2015, 09:52 PM
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I mained Gary regarding my queries and he got back to me almost immediately. This is what he had to say.

Quote:
Originally Posted by Gary Weishaupt
The frame you want to use for a Bobber project is the 1948 frame drawing. As to the springs we have no 'standard' drawing as the rates are determined by the weight of the bike. Most big twins use lower springs having a rate of 150 pounds per inch each. The upper springs have a rate of 75 pounds each. The lowers are typically 2-inches in diameter using .25" wire wound with 10 active coils. The uppers are also 10 coils but wound with .188-inch wire progressively from 1.875-inch at the base to 1-inch at the top. lowers are 6.5-inches long uncompressed and uppers are around 5.25" uncompressed in length. Basically the compression springs have a rate of one-half of the weight of the bike divided between each one.
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  #20 (permalink)  
Old 07-30-2015, 02:21 PM
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I think it would be a mistake to use 1/16 inch thick tubing.
You need to think about corrosion over the years.
Many Honda CB750's suffered extensive corrosion in the bottoms of the frames.

IF you use .120 tubing the bike will last longer and not flex as much even if it does have rear suspension. Not much of a weight penalty. Easier to weld without fear of burning through.
Attachments to the frame will not need so much reinforcement with thicker tubing.
Stock frames use overlapping sections of that thin tubing to obtain strength. Don't forget.

Use DOM tubing. You can buy it online in 9 foot sections that can be UPS shipped.
Someday you may want to sell it and the new owner will feel a lot better about the frame knowing it was good tubing.

Last edited by donald branscom; 07-31-2015 at 08:06 AM..
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  #21 (permalink)  
Old 07-30-2015, 11:13 PM
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Thanks Donald, I'll definitely keep that in mind. The issue for me is, since I'm in India, a lot of these sizes aren't readily available and need to be ordered. That said, I will definitely look for the .120 tubing before I start fabrication. What's your view on the springer front end tho? Can I use .120 there as well, or should I opt for a higher grade?

Quote:
Originally Posted by donald branscom View Post
I think it would be a mistake to use 1/16 inch thick tubing.
You need to think about corrosion over the years.
Many Honda CB750's suffered extensive corrosion in the bottoms of the frames.

IF you use .120 tubing the bike will last longer and not flex as much even if it does have rear suspension. Not much of a weight penalty. Easier to weld without fear of burning through.
Attachments to the frame will not need so much reinforcement with thicker tubing.
Stock frames use overlapping sections of that thin tubing yo obtain strength. Don't forget.

Use DOM tubing. You can buy it online in 9 foot sections that can be UPS shipped.
Someday you may want to sell it and the new owner will feel a lot better about the frame knowing it was good tubing.
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  #22 (permalink)  
Old 07-31-2015, 08:13 AM
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Do you have use of the internet?
If you build a rigid frame use 1-1/4 tubing and 1.5 tubing for the back bone.
You can order a steering neck from Bitter end choppers.

But you will need more than a 110V MIG welder for welding the steering neck.
110V will not work. You will need 220V.
You could tack it together and maybe get a big shop to weld the steering neck.
Make sure the fit up is perfect.

A Suzuki Savage frame with modifications, might be perfect for your project.
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  #23 (permalink)  
Old 07-31-2015, 09:31 AM
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Quote:
Originally Posted by donald branscom View Post
Do you have use of the internet?
he might be typing this from his goat...
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  #24 (permalink)  
Old 07-31-2015, 11:13 PM
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Quote:
Originally Posted by Poop View Post
he might be typing this from his goat...
Actually I used my camel for that, now I'm typing on my pet cow
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  #25 (permalink)  
Old 07-31-2015, 11:21 PM
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Smile

Quote:
Originally Posted by donald branscom View Post
Do you have use of the internet?
If you build a rigid frame use 1-1/4 tubing and 1.5 tubing for the back bone.
You can order a steering neck from Bitter end choppers.

But you will need more than a 110V MIG welder for welding the steering neck.
110V will not work. You will need 220V.
You could tack it together and maybe get a big shop to weld the steering neck.
Make sure the fit up is perfect.

A Suzuki Savage frame with modifications, might be perfect for your project.
Hi Donald, thanks again for your reply, but you can't really expect me to ship tubing all the way from the US do you? I mean 50$ for tubes and 500 for shipping? Doesn't make sense... I have access to plenty of 220v 3 phase 400amp mig welding machines. I'm also buying a 250amp TIG welding machine for this purpose, should have it within 1-2 weeks. I also have access to a full fledged machining shop, so I'll be making my own steering neck. Cheers!!!

Also, the Suzuki Savage was never sold in India.
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Last edited by psych0hans; 07-31-2015 at 11:31 PM..
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  #26 (permalink)  
Old 08-01-2015, 05:31 AM
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Royal Enfield into a v twin...

Here,s a cool full custom transformation.

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VITALY.
SORRY FOR THE UPPER CASE. CAN'T SEE SHIT.
113"s&s, Walz softail 2000/2012 prostreet
96"s&s, Daytec dyna/ softail hybrid, 1998/2010 chopper
127"Ultima, Chassis Design rigid 2013 bobber
120"Ultima, Kraft Tech FL 2014/2019 bobber
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  #27 (permalink)  
Old 08-02-2015, 11:38 AM
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obsessed with this bobber

Why not sell or trade that classy old bike to someone who appreciates it for what it is, and then use the proceeds to build something like the second picture you posted.
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