What the heck is this tool for ........ cleaning

[skyhawk]

I was told long pipe cleaners are best



.

[al_yrpal]

Which is just horribly jarring... they are sprockets, not cogs. Fundamentally different things.

Not quite. Any disc with teeth on it is a cog, the terms ‘sprocket’ and ‘ring’ just refer to the function and position of the cog.

A cog has teeth that mesh with those of another cog or worm gear etc. A sprocket’s teeth meshes with a roller chain.

They are different.

Cog can also refer to the individual teeth on a cog, and could stretch to those on a sprocket as well, but the whole round thing is a sprocket, not a cog.

+1

Hate it when bolts get called screws etc

Al

[Marcus Aurelius]

Which is just horribly jarring... they are sprockets, not cogs. Fundamentally different things.

Not quite. Any disc with teeth on it is a cog, the terms ‘sprocket’ and ‘ring’ just refer to the function and position of the cog.

A cog has teeth that mesh with those of another cog or worm gear etc. A sprocket’s teeth meshes with a roller chain.

They are different.

Cog can also refer to the individual teeth on a cog, and could stretch to those on a sprocket as well, but the whole round thing is a sprocket, not a cog.

Nope.

[backnotes]

Cog
Popular term for a rear sprocket. Sometimes incorrectly used as a synonym for cluster, which is actually a group of cogs.

Sprocket
……..
The rear sprockets individually are also commonly called cogs or gears; as a group they are referred to as a block, cassette, cluster or freewheel.

Three guesses which bicycle glossary these two definitions comes from…..

Apologies - it was me who first used that pesky "c*g" word above, without even thinking. I will write out 100 lines of "a cassette is made from sprockets and not cogs" as punishment.....

[Mick F]

Hate it when bolts get called screws etc

Screws have the thread all the way to the head, and bolts have the thread only part way up.

[skyhawk]

Hate it when bolts get called screws etc

Screws have the thread all the way to the head, and bolts have the thread only part way up.

totally untrue see image

[Mick F]

They are both screws, despite what the picture calls them.
Maybe more correct would be "set screws" as opposed to "wood screws".

Bolt on the right, screw on the left.

[Cugel]

They are both screws, despite what the picture calls them.
Maybe more correct would be "set screws" as opposed to "wood screws".

Bolt on the right, screw on the left.hex-bolt.jpg

Semantics war: always entertaining!

My own habit is to call anything with threads (full or partial) on a shaft that is the same diameter for it's full length a bolt, whilst a screw has thread (full or partial) that's on a tapered shaft, often with a point. The heads can be any shape or even absent (as with the mini-bolts used to set plunge-depth on a router, which typically have a slotted tip on the protruding end of the bolt).

But one screws in (or out) a bolt as well as a screw, whilst one can only bolt something together with a bolt having a matching nut. So here is another pointer to a bolt being defined by it's single-diameter shaft, as one cannot put a nut onto a tapered shaft screw.

Cugel

[skyhawk]

Watch this from 5 minutes and 30 seconds

https://www.dailymotion.com/video/x5756ki

Interesting

[cotswolds]

Hate it when bolts get called screws etc

Screws have the thread all the way to the head, and bolts have the thread only part way up.

And this is a bolt?

I'd say bolts go into machined threads on a nut or similar and so can have a square end, screws taper to a point and cut into whatever they're going in to, meaning they have sharp edges to the threads.

But there are probably exceptions to that.

[Mick F]

As I said ....................

Maybe more correct would be "set screws" as opposed to "wood screws".

[Cugel]

Watch this from 5 minutes and 30 seconds

https://www.dailymotion.com/video/x5756ki

Interesting

The convention is to say what it is that the video or other link is linking to, with perhaps an illustrative paragraph or description. I never click on mysterious links and advise that others follow the same precaution.

Cugel

[Vantage]

Hate it when bolts get called screws etc

Al

I suppose it depends on the context.
I can't very well ask the missus if she fancies a bolt can I?

[axel_knutt]

I love the way the Americans have got themselves into a mucking fuddle with their legal definition:
https://www.accu.co.uk/en/p/131-differe ... -and-bolts

[mattheus]

Hi

Which is just horribly jarring... they are sprockets, not cogs. Fundamentally different things.

Agreed, but the brush is named for it's inventor, the German engineer Uve Cog
Regards
tim-b

Is this a wind-up? If so, it's rather lovely

I tried googling, but was inconclusive.
German engineer "Uve Cog" brush
... is a googlewhack