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Author Topic: BB: what's this bit called and how do I remove it?  (Read 3161 times)

nikki

BB: what's this bit called and how do I remove it?
« on: 18 November, 2018, 04:27:42 pm »
I'm taking apart a cheapy kid's bike and have got as far as these silvery bits in the bottom bracket (single piece crank):



Are these cones? Cups? Something elses?

How do I remove them?
Are they just going to be press fit? Would tapping the far side from through the shell work?

I need to be able to reassemble the bike afterwards, so not looking for destructive removal methods!

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rogerzilla

  • When n+1 gets out of hand
Re: BB: what's this bit called and how do I remove it?
« Reply #1 on: 18 November, 2018, 04:43:47 pm »
It's a Thompson or Ashtabula BB.  The cups can be drifted out and pressed back in but you might as well clean them in situ if they're not pitted.
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Hard work sometimes pays off in the end, but laziness ALWAYS pays off NOW.

Torslanda

  • Professional Gobshite
  • Just a tart for retro kit . . .
    • John's Bikes
Re: BB: what's this bit called and how do I remove it?
« Reply #2 on: 18 November, 2018, 04:51:23 pm »
As Roger said. No need to knock them out of the frame, just clean in situ.

Pleanty of grease with the bearings, they aren't sealed *AT ALL*.
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VELOMANCER

Quote from: trekker12 on 16 July, 2016, 08:54:33 am
Well that's the more blunt way of putting it but as usual he's dead right.

nikki

Re: BB: what's this bit called and how do I remove it?
« Reply #3 on: 18 November, 2018, 05:01:19 pm »
Thanks rogerzilla - seems it's an Ashtabula BB and the new vocab is unlocking another layer of internet searching!

Quote from: Torslanda on 18 November, 2018, 04:51:23 pm
just clean

pffff!   ;D

I'm going to be chopping the frame and then welding onto the BB, so I'd prefer to remove these if I can. No idea how they're react to heat, but I'm imagining it would be less than ideal!
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Torslanda

  • Professional Gobshite
  • Just a tart for retro kit . . .
    • John's Bikes
Re: BB: what's this bit called and how do I remove it?
« Reply #4 on: 18 November, 2018, 05:05:58 pm »
In that case simply remove with a drift and a Brummie screwdriver...
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VELOMANCER

Quote from: trekker12 on 16 July, 2016, 08:54:33 am
Well that's the more blunt way of putting it but as usual he's dead right.

nikki

Re: BB: what's this bit called and how do I remove it?
« Reply #5 on: 18 November, 2018, 05:12:21 pm »
Okeycokey.

Think it's going to need a bit more welly than I can give it on my lounge floor, so will have at it in a workshop tomorrow now I know there aren't any threads in there.
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rogerzilla

  • When n+1 gets out of hand
Re: BB: what's this bit called and how do I remove it?
« Reply #6 on: 18 November, 2018, 05:20:03 pm »
A headset cup remover (rocket tool) would do a good job.
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Hard work sometimes pays off in the end, but laziness ALWAYS pays off NOW.

Brucey

Re: BB: what's this bit called and how do I remove it?
« Reply #7 on: 18 November, 2018, 06:15:56 pm »
Quote from: nikki on 18 November, 2018, 05:01:19 pm

....I'm going to be chopping the frame and then welding onto the BB, so I'd prefer to remove these if I can. No idea how they're react to heat, but I'm imagining it would be less than ideal!

sounds like you are making 'something interesting'......??? :o

cheers
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nikki

Re: BB: what's this bit called and how do I remove it?
« Reply #8 on: 18 November, 2018, 07:38:34 pm »
Quote from: rogerzilla on 18 November, 2018, 05:20:03 pm
A headset cup remover (rocket tool) would do a good job.

Yeah: I'm at the point where I need to remove the headset cups too!

Freed the seized quill stem, though!

Quote from: Brucey on 18 November, 2018, 06:15:56 pm
sounds like you are making 'something interesting'......??? :o

All being well, I'm going to make a drawing of a bike

(click to show/hide)
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Cudzoziemiec

  • Ride adventurously and stop for a brew.
Re: BB: what's this bit called and how do I remove it?
« Reply #9 on: 18 November, 2018, 07:48:01 pm »
Quote from: nikki on 18 November, 2018, 07:38:34 pm
Quote from: Brucey on 18 November, 2018, 06:15:56 pm
sounds like you are making 'something interesting'......??? :o

All being well, I'm going to make a drawing of a bike

(click to show/hide)
This I want to see! But probably not actually ride. Maybe something Wobbly John would ride...
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Riding a concrete path through the nebulous and chaotic future.

nikki

Re: BB: what's this bit called and how do I remove it?
« Reply #10 on: 18 November, 2018, 08:26:12 pm »
This is the limbering up before making a wobble bike...
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cygnet

  • I'm part of the association
Re: BB: what's this bit called and how do I remove it?
« Reply #11 on: 19 November, 2018, 11:46:15 pm »
That 'drawing' doesn't look at all wobbly.
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I Said, I've Got A Big Stick

nikki

Re: BB: what's this bit called and how do I remove it?
« Reply #12 on: 20 November, 2018, 08:31:12 am »


Update: I made a thingy and it worked a treat.

Next: Need to make between 3 and 5 pairs of forks/stays (mapping standard anatomy terms onto this project is proving a bit of a challenge at times!)
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nikki

Re: BB: what's this bit called and how do I remove it?
« Reply #13 on: 02 May, 2019, 10:51:12 pm »
Quote from: Cudzoziemiec on 18 November, 2018, 07:48:01 pm
Quote from: nikki on 18 November, 2018, 07:38:34 pm
Quote from: Brucey on 18 November, 2018, 06:15:56 pm
sounds like you are making 'something interesting'......??? :o

All being well, I'm going to make a drawing of a bike

(click to show/hide)
This I want to see! But probably not actually ride. Maybe something Wobbly John would ride...

Et voilà!



They're definitely onto something with that handlebar and pedal configuration - I'm liking the slimline storage profile  :thumbsup:



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Kim

  • Timelord
    • Fediverse
Re: BB: what's this bit called and how do I remove it?
« Reply #14 on: 02 May, 2019, 10:55:13 pm »
For some reason the phrase two independent breaking(sic) mechanisms popped into my mind...
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Wobbly John

Re: BB: what's this bit called and how do I remove it?
« Reply #15 on: 03 May, 2019, 12:31:56 am »
We're needing a "Tales from the Nikki Workshop" thread...  :D
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If it ain't broke, fix it 'til it is...

Cudzoziemiec

  • Ride adventurously and stop for a brew.
Re: BB: what's this bit called and how do I remove it?
« Reply #16 on: 03 May, 2019, 05:54:23 pm »
Top workshopping! It looks very two dimensional. I do admire the flappetty "in line" pedals. Must be so much more aerodynamic that way, I'm surprised we haven't seen it the TT stages of any of the big tours (or has the UCI already banned it?).
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Riding a concrete path through the nebulous and chaotic future.

FifeingEejit

  • Not Small
Re: BB: what's this bit called and how do I remove it?
« Reply #17 on: 03 May, 2019, 07:00:59 pm »
Nice, i'm now wondering where the inspirational road markings come from after confirming it's not conforming to the TSRGD diagram for a bike.
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Kim

  • Timelord
    • Fediverse
Re: BB: what's this bit called and how do I remove it?
« Reply #18 on: 03 May, 2019, 07:33:37 pm »
Quote from: FifeingEejit on 03 May, 2019, 07:00:59 pm
Nice, i'm now wondering where the inspirational road markings come from after confirming it's not conforming to the TSRGD diagram for a bike.

People who don't care about bikes left in charge of white paint with neither a stencil nor a responsible adult.
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Jurek

Re: BB: what's this bit called and how do I remove it?
« Reply #19 on: 04 May, 2019, 02:40:05 pm »
That's very cool Nikki :thumbsup:
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Kim

  • Timelord
    • Fediverse
Re: BB: what's this bit called and how do I remove it?
« Reply #20 on: 04 May, 2019, 02:43:51 pm »
Quote from: Jurek on 04 May, 2019, 02:40:05 pm
That's very cool Nikki :thumbsup:

The best thing (apart from the pedals) is watching people react to it.  Their expression goes from "Why is there a bike here?" to "Wait what?"


Interestingly, this is similar to the facial expression progression of cyclists encountering particularly creative Silly Sustrans Gates™ for the first time, without the inevitable "Oh, for fuck's sake." stage.
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nikki

Re: BB: what's this bit called and how do I remove it?
« Reply #21 on: 04 May, 2019, 06:26:46 pm »
Quote from: Wobbly John on 03 May, 2019, 12:31:56 am
We're needing a "Tales from the Nikki Workshop" thread...  :D

I'm pinging around between 4 different workshops at the moment - between them they just about have the space and tools I need, but not really in useful densities or combinations  :facepalm:

There's been a lot of this:










Quote from: FifeingEejit on 03 May, 2019, 07:00:59 pm
Nice, i'm now wondering where the inspirational road markings come from after confirming it's not conforming to the TSRGD diagram for a bike.

Stourbridge. Here if I remember correctly: https://goo.gl/maps/Pj2t1nkt7UrXhKo2A
The pictogram on the lane in the other direction was differently wrong:




Thanks for the nice words, folks!  ;D

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Kim

  • Timelord
    • Fediverse
Re: BB: what's this bit called and how do I remove it?
« Reply #22 on: 04 May, 2019, 07:15:20 pm »
Quote from: nikki on 04 May, 2019, 06:26:46 pm
Stourbridge. Here if I remember correctly: https://goo.gl/maps/Pj2t1nkt7UrXhKo2A

Thanks to clicking on that, I now know that the Boing Zone Trampoline Park is a thing.  That's what I'd want to call it if I owned a trampoline park.  (Which, for the record, is extremely unlikely.)
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