Copyright WWW.DBBP.COM | updated 25-November-2024


Project started October 2023,

 
To make room for the 170 mm wide rear tire the chain and transmission needed to move to the left 8.5 mm, so I measured the stock transmission plate and drew a new one with 8.5 mm offset in CAD. I dimensioned everything from one of the corners (O,O) and put all the X and Y coordinates on the drawing so we would be able to machine it on the manual Bridgeport using the DRO (Digital Readout) We started with a steel plate that was sawed off about 40 mm longer than needed. (for clamping purposes)

 
 
Aad removed some material with the bandsaw to save machining time, and we added 2 extra holes in the steel strip so we would be able to use those to bolt it to the T-slots in the Bridgeport. When the holes, slots and long sides of the plate were machined Aad sawed off the short sides that had been used for clamping, and machined the short sides in a fixed jaw vise
 
 
 
After a bit of sanding, and filing we had the final shape. The 2 front mounting holes were tapped, top and bottom were sanded to get rid of the mill scale and all the edges chamfered with one of those super handy chamfering tools that sounds like the dentist from hell!

 
 
 
 

In the next episode we will be replacing the mainshaft of the transmission with a shorter one so the bike stays as narrow as possible. Did I mention it will have a Cannonball electric start also?


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