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riddle me this: how are bearings inserted into cartridges?
 

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walter
Joined: 11 Jan 2004
Posts: 4391
Location: metro-motown-area

1/19/14 10:42 AM

riddle me this: how are bearings inserted into cartridges?

i watched this video of the assembly of cartridge bearing assemblies, but i cannot for the life of me figure out the magic of how the polished bearings are jammed into the space between inner/outer races.

that race-bearing-race fit is an interference fit...which is how radial bearings stay together...but if the bearings and races are fully polished/finished before final assembly...how are they all combined together w/o some sort of deformation being required?!

just calling it a "ball pusher" as they do in the video doesnt help me understand how that insertion really takes place...help a brother find some Truth!

https://www.youtube.com/watch?v=b6svVy1lYOA

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walter
Joined: 11 Jan 2004
Posts: 4391
Location: metro-motown-area

1/19/14 10:51 AM

i get it!

found this vid...the bearing spacer is key...w/o it the bearings can all jam together on one side, allowing the inner race to slide into place.

duh.

https://www.youtube.com/watch?v=KsGh0wbJWtQ

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Jesus Saves
Joined: 16 Jun 2005
Posts: 1150
Location: South of Heaven

1/21/14 7:23 AM

"ball pusher"

That's good to know, as I was afraid someone was trying to bust your balls (bearings).

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walter
Joined: 11 Jan 2004
Posts: 4391
Location: metro-motown-area

1/22/14 8:37 PM

ok, now figger this one: no-cage bearings

how in the hell do you get all them bearings inside of those races?!

i only see it with full ceramics, so maybe there's some difference in the mfg process that makes this possible? definitely a head-scratcher!



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ErikS
Joined: 19 May 2005
Posts: 8337
Location: Slowing boiling over in the steamy south, Global Warming is real

1/23/14 4:45 AM

The races are oversized then deformed by the press into the final shape which captures the balls.

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walter
Joined: 11 Jan 2004
Posts: 4391
Location: metro-motown-area

1/23/14 7:57 AM

re-sized?

very skeptical. bearings require precision-ground races to function at all.

there's no way races can be resized, ceramic in particular, while maintaining that high a level of precision around shape/geometry *and* not damage the fragile surfaces of the bearings and races themselves.

also, ceramics are an incredibly brittle class of material -- to call it "non-malleable" is a serious understatement.

i just emailed VXB to see what they can/will share.

also, i found an example of cageless stainless bearings...so it's not material specific to ceramics:

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walter
Joined: 11 Jan 2004
Posts: 4391
Location: metro-motown-area

1/23/14 8:16 AM

found it!

filling slots that are machined to a spec requiring heat/cooling for assembly.

the slots are in the inner/outer races and must be aligned for bearing insertion...in addition to significant heat added to the outer race and significant cooling applied to the inner race...with that combination of alignment and temps, the bearings will go in. back @ room temp, everything stays locked in place.

doesnt look to be relevant for cycling applications: "Full complement ball bearings are specified for high radial load applications, often in pairs. Axial load ratings are reduced because of the fill slots."


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Sparky
Joined: 08 Dec 2003
Posts: 19200
Location: PDX

1/23/14 1:14 PM

Walter, when are you going to get to the bottom of this? ;)

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Andy M-S
Joined: 11 Jan 2004
Posts: 3377
Location: Hamden (greater New Haven) CT

1/24/14 9:12 AM

Do you know...

How difficult it's been not to post this?

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Dave B
Joined: 10 Jan 2004
Posts: 4511
Location: Pittsburgh, PA

1/24/14 11:40 AM

Andy, that shot cartridge illustration is really old. Overshot wads, and fiber over-powder wads haven't been used since the '60's.

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Andy M-S
Joined: 11 Jan 2004
Posts: 3377
Location: Hamden (greater New Haven) CT

1/24/14 12:33 PM

Yeah

It's closer to 100 years old, but it does have to do with ball bearings and cartridges...

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dan emery
Joined: 11 Jan 2004
Posts: 6935
Location: Maine

1/24/14 2:47 PM

yeah

Actually Andy's cartridges are used in bottom brackets, both to initiate the final sprint and to dispatch opponents.

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Andy M-S
Joined: 11 Jan 2004
Posts: 3377
Location: Hamden (greater New Haven) CT

1/24/14 2:48 PM

Cyclicide? Pesticide?

nm

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