SOHC.co.uk Forums > CB350/400
Rear disc conversion
K2-K6:
Thinking with more clarity ;D it's a necessary part of design to have a bearing in that location.
The drum brake plate is static and so pinches the main wheel bearings on their inner races when the axle is tightened, but with the disc "plate" spinning with the wheel you have to go through it in it's entirety (bearing inner race, plus spacer if needed) to complete that clamping requirement while the plate revolves with the wheel.
Without it you couldn't tighten the wheel.
allankelly1:
Yes the bearing set up will need some thought but it’s simple to add two bearings in to the disc carrier to give the correct support
Next job though is to get the correct cb400n disc in place and design and print a caliper hanger that fits the Brembo unit
Once this is sorted in rough I can then review the final set up and add the finally touches to the final assembly such a extra bearings and spacers and then make the final unit in aluminium
And the great thing is that 3d models take out all the guess work like when I built up my one-off front end for my hybrid build
A lot of work but a nice special one off
Best wishes Al
allankelly1:
--- Quote from: K2-K6 on October 11, 2021, 06:38:38 PM ---Thinking with more clarity ;D it's a necessary part of design to have a bearing in that location.
The drum brake plate is static and so pinches the main wheel bearings on their inner races when the axle is tightened, but with the disc "plate" spinning with the wheel you have to go through it in it's entirety (bearing inner race, plus spacer if needed) to complete that clamping requirement while the plate revolves with the wheel.
Without it you couldn't tighten the wheel.
--- End quote ---
Hi K2-K6
Just been thinking and if I add two bearings like the wheel bearing set up with a spacer tube etc on the disc carrier that will solve the possible sideways movement as the unit would be clamped in place by the wheel spindle like the wheel itself And to stop any rotation movement just need a set of bosses on the end that snuggly fit between the Cush drive bosses cast on the inside of the hub assembly
May also add a rubber some rubber dampers to stop any possible rattles due to slight movement of the disc carrier in the wheel hub (like a cush drive) as I can print custom rubber inserts
Easy peasy and the design means I don’t need to do any mods to the original hub itself
Just waiting for that disc to arrive now so I can sort out that caliper mounting
Lastly just need to decide a price on my original complete kick starter that I no longer need due to the rearsets and thats the project financed
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Best wishes Al
Laverdaroo:
Well that's p@*sed on my chips for sure ;D ;D ;D
I'm in utter awe of what you can do and have achieved on the computer and printer, what a superb way to go at things, fantastic work. I was really chuffed 'fasion-ing' a bespoke reg plate holder n bracket for the 400, I feel totally 'top trumped' LOL
So far that's a great start to a solution and fining the read really helpful as I wanted to do similar with the one I have ready to start in the shed, (currently parts collecting). Huge food for thought and a great topic. Keep us up to speed on how you're getting on.
Skills!!!
PS:- Im with Ken, dont 'diss' Brembos' ;D
allankelly1:
Hi
Thanks for the compliments and point taken on the wanton vandalism of the Brembo caliper
I think when it’s all done, as I will have the models of all the required parts, I am happy to share any engineering drawings etc as I guess other would like to maybe do this change but would need to farm out the machining side of it as I have plenty of other projects on the go as I print lots of other NLA parts for the RD guys as a “hobbyâ€
On the other hand if I win the lottery I will have my own machine shop with a CNC mill lathe etc and I will do your conversion for free
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