VK3CKC's eLecTricks Trike Design and Build.

Joined
Feb 20, 2013
Messages
756
Location
Axedale, Victoria, Australia
Website
axerail.coffeecup.com
Could I make a better mid-drive from a bottom bracket? The basic requirement, assuming that there will be some sort of freewheel on the rear axles, is to accept drive from the front chain and drive output with a drive gear for each of the rear axles, as well as a conventional multi-gear cassette on the right side.

The significant difference between a wheel hub and a bottom bracket: The wheel hub rotates around the fixed axle on bearings whereas a bottom bracket has a rotating spindle held captive within its bearings. How difficult would it be to attach a freewheel and an output gear to the right hand side of a bottom bracket and an output gear to the left hand side? The output gears could be turned by the rotating spindle providing the rear axle gears were freewheel. I owed it to the project to find out.

The two output drive gears on each side of a re-purposed bottom bracket could simply be the 28t sections of two existing chainring sets with their fixed pedal crank arms cut off. Attaching a freewheel to the one on the right hand end might be a bit more challenging.

I managed to find a modified bottom bracket/chainring set from a build from years ago to try. I won't use this one beyond this test as the pedals are held on by a nut, I would prefer a bolt for a purpose I have in mind, and the left hand pedal looks like its rusty old thread will not allow me to remove it anyway.

I removed the centre of the chainring to which the pedal arm was attached and put its 28t chainring aside for later. I cut the discarded end of one of the two hubs used in the Mk1 mid-drive version (earlier post) flush with what was the inside of its spoke flange.

I had to make what was left of the cut off pedal arm a little smaller so that the hub end would fit over it. Not only was it too large, it was also out-of-round, having been only roughly finished with an angle grinder. Due to a not very well equipped workshop, my options were limited and I could not access anything more professional due to Covid-19 and I didn’t really want to spend anything anyway.



Once again, a makeshift lathe came into play. I fitted the chainring centre to the old bottom bracket, clamped it in a vise, clamped the vise to the workbench and brought the bench grinder up close enough for the side of the grinding wheel to make contact with the area that required reducing. Turning the left pedal rotated the part against the rotating grinding wheel and, in far less time than I expected, it was small enough for it to fit inside the hub. The discarded hub end fitted nicely, so the hub part used in the Mk1 mid-drive was cut flush with the inside of its spoke flange and it too fitted nicely in place. It was the same size so no real surprise there.
 
Joined
Feb 20, 2013
Messages
756
Location
Axedale, Victoria, Australia
Website
axerail.coffeecup.com
Sorry, not much activity lately. Have been nursing a very bad back problem for three weeks now and not liking the forced construction stop. I am in the middle of the new mid-drive and rear axle drives. Parts have been done but I can't finish at the moment.

In addition, we started our second Covid-19 lockdown at last midnight so not much will take place until September 13 if it requires going somewhere to get something. Other states have closed their borders as infections return there as well.

I hope this time that all the conspiracy theorists, anti-maskers, human rights, freedom protestors, you-can't-tell-me-what-to-do, infected isolators who still go out, etc., have learned something. One in four positive isolators were found to be not at home when doorknocks were undertaken. Our infection rate is now far in excess of what it was before the first lockdown. A State of Disaster has been issued for Victoria and the Police have increased powers. Melbourne has an 8pm-5am curfew. Businesses are closed left, right and centre, reduced staff levels, job losses, etc.

Things don't look good for the economy at all or at least not for a long time. Won't be much to do except trike riding.
 
Joined
Sep 12, 2012
Messages
2,848
Location
Apple Valley, California, USA
I hope this time that all the conspiracy theorists, anti-maskers, human rights, freedom protestors, you-can't-tell-me-what-to-do, infected isolators who still go out, etc., have learned something. One in four positive isolators were found to be not at home when doorknocks were undertaken. Our infection rate is now far in excess of what it was before the first lockdown. A State of Disaster has been issued for Victoria and the Police have increased powers. Melbourne has an 8pm-5am curfew. Businesses are closed left, right and centre, reduced staff levels, job losses, etc.

Things don't look good for the economy at all or at least not for a long time. Won't be much to do except trike riding.
About the same where I live.

I had an unpleasant trip to our local Lowes/Home Depot. Enough so I wrote our local paper.
I'm told it will be printed in tomorrow's paper.
This is what I wrote ... (hope this doesn't violate the posting etiquette)

It's about ...Free-dumb

My visit at Lowes and Home Depot, Aug 3, 2020. I felt disgusted and anger brewing and I felt uneasy and discomforted being around and watching the self-anointed privileged, self-righteous, primadonnas walking around wearing no mask, or masks pulled down under their chin, or masks hanging from one ear, or masks with only their mouths covered. All prancing around infecting everything they touch or breath around. Using 'freedom' as one's excuse is just a load of BS. There's freedom as most of us know it. And then there is 'free-dumb', as the no maskers know it. Their interpretation means 'free to be dumb'. It is hard to accept that there is this type of person that lives in the same void as the rest of humanity. How they couldn't care less about those that are respecting and abiding by a safe medical practice of just wearing a damn mask. How infantile. How callous. How self-serving. How disrespectful. How unsafe. How uncaring. How ignorant. And not only are these primadonnas snubbing their noses at Lowes and Home Depot but all of society. I also blame these businesses for not having the courage to enforce their own requirements. What happens if I show up with no shirt or no shoes? Will I be told to leave, or can I finish spending my money first? If having security patrols on hand to enforce this mask requirement is what it takes, to make the store safer, then that's what needs to be done. Clearly, this is a national medical emergency and a danger to all of us, warranting such action. From this lame sorry excuse of a president on down, trying to be nice and hoping it will just go away, or being afraid to impose live-saving restrictions is just outright criminal.
 
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