bikes

Current progress on the bike frame. I managed to get the top tube mitered, which was the last tube in the front triangle of the frame.



I was also able to use a lathe to remove some of the sidewall on the chainstays and fit the rear dropouts. This is an essential step for getting the bike project off the ground, and I am very glad I have the tools to do this now.

I finally got the chainstays and seatstays complete, finding a jig and welding remain the final steps of making the frame.

so cool

Picture with complete chainstays and seatstays.

Head tube is now cut to proper length, next step is finding a jig to hold all of the tubes together.

I'm really curious to know how you managed to print a giant piece of paper the size of a bike. Did you have to go to a commercial print shop? How much did it cost to print out the design?

The local university that I am attending for a masters degree has a poster printing service at it's library. It was about 41 dollars to get this printed, and I think it was worth it.

Currently working on getting a jig ready to hold the tubes together. The jig I am using is based on the design seen here in this instructables tutorial.
https://www.instructables.com/A-simple-bicycle-frame-jig/

Finally got the courage today to ride a 5 foot tall unicycle without holding onto a wall.

Finally got the courage today to ride a 5 foot tall unicycle without holding onto a wall.

WOW!!! That's tall

Cool idea using the fence at a tennis court to keep you from falling over

I went to a unicycle meetup yesterday and got a chance to ride this wacky custom made unicycle built around a roller skate wheel. I have no doubt this is one of the most difficult unicycles I have attempted to ride.

I went to a unicycle meetup yesterday and got a chance to ride this wacky custom made unicycle built around a roller skate wheel. I have no doubt this is one of the most difficult unicycles I have attempted to ride.

Wow I had no idea there were unicycle meetups. That's cool!

I'm surprised how smooth it rides. The gear ratio is interesting. I guess you need a lot of torque to move such a small wheel like that

Finally got the tubes assembled in a jig.

A nice use of aluminum t slot extrusions 😎👍

Hi fellas,

sorry for the long wait, life has been extremely hectic with school and work. I have managed to make some progress on the bike frame. I got some help to correct the miters on the tubes with a hand file, and the tubes now fit correctly in the jig. The chainstays have also been increased in diameter from 1/2 inch diameter to 5/8 inch diameter. This change was made because the chainstays bear more cantilever loads that the seatstays, and increasing the diameter will help ensure more power from the pedals goes into rotating the back wheel rather than bending the frame. The brake bridge for the seat stays has also been mitered with an end mill. I have also been working on improving my TIG welding skills, which are currently one of the largest remaining obstacles towards a finished product.