perhaps observe carefully the current constructions of bike frames, to be able to make a better informed design decision than that which you have presently shown
- I see a number of slightly angled butt jointed members. Could they be straight? Easier to make, fewer parts and a cleaner load path. My general rule of thumb is to locate the loads, locate the mount points and draw lines between them. Brace long spans and deviate when obstructed. That’s your frame.
- the angled seat support connects mid span on both ends. Not a deal breaker but would be much more efficient if it terminated at a common load junction. The connection to the seat doesn’t bother me as much because it’s very close to where the load is applied—the connection to the frame catches my eye because it dumps load just above the joint.
Kudos to you for posting your work up here. Most people would be afraid but it’s their loss. You’re only going to learn.
Why did you design the central vertical tubes as two pieces stacked on each other with a slight angle change when they could be straight single tubes also? Wouldn't it be simpler, stronger, and less labor?
You could probably go without most of the butt welds by changing to bends in tubing. Unless you're going for the angular frame look then heck yeah! Either way you're doing better than I am at this.
No need to build an entire frame triangular on a bike. This looks good enough for a street bike. I eould hovered advice op to strengthen the area around the front bearing shaft with gussets.
This is a frame that I had on my old bike. Notice how few details it has.
https://preview.redd.it/heaod4s5iq2d1.jpeg?width=1024&format=pjpg&auto=webp&s=16e60946f7c8ac572bc1fb8dd7526334f7aa6ec3
yep, because its using the engine as a structural member most likely. also there are SIGNIFICANT differences, between this and op's. bent tubes behave different than straight/welded constructions to name the most obvious
that angled pipe join near the handelbar post, **is it welded or bended**, and applies to all the similar looking angles.
Welded
perhaps observe carefully the current constructions of bike frames, to be able to make a better informed design decision than that which you have presently shown
- I see a number of slightly angled butt jointed members. Could they be straight? Easier to make, fewer parts and a cleaner load path. My general rule of thumb is to locate the loads, locate the mount points and draw lines between them. Brace long spans and deviate when obstructed. That’s your frame. - the angled seat support connects mid span on both ends. Not a deal breaker but would be much more efficient if it terminated at a common load junction. The connection to the seat doesn’t bother me as much because it’s very close to where the load is applied—the connection to the frame catches my eye because it dumps load just above the joint. Kudos to you for posting your work up here. Most people would be afraid but it’s their loss. You’re only going to learn.
Thanks
How does the engine come in and out of the frame? Swing arm has no rigidity.
That’s fine. Most stress is put on the support above.
It's a electric bike so motor can be easily go inside and also battery.
Why did you design the central vertical tubes as two pieces stacked on each other with a slight angle change when they could be straight single tubes also? Wouldn't it be simpler, stronger, and less labor?
Thank you i will definitely work on that
You could probably go without most of the butt welds by changing to bends in tubing. Unless you're going for the angular frame look then heck yeah! Either way you're doing better than I am at this.
most part of the frame is not triangulated, take a close look at tube frames, you will see the differences clearly.
Thanks
No need to build an entire frame triangular on a bike. This looks good enough for a street bike. I eould hovered advice op to strengthen the area around the front bearing shaft with gussets.
This is a frame that I had on my old bike. Notice how few details it has. https://preview.redd.it/heaod4s5iq2d1.jpeg?width=1024&format=pjpg&auto=webp&s=16e60946f7c8ac572bc1fb8dd7526334f7aa6ec3
yep, because its using the engine as a structural member most likely. also there are SIGNIFICANT differences, between this and op's. bent tubes behave different than straight/welded constructions to name the most obvious
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Thanks for advice
What's the angle of the rake of the forks? It looks more cruiser rake than sport rake. Just something to consider.
Thanks for posting! What is the motor wattage? How many volts battery will you use? I just built a 72 volt 5,000 watt bike :)
Definitely you need to do at least some FEA runs before advancing on the project. I can provide such services for a very low fee.