RADBMX.CO.UK
Technical & Reference Section => Tech and Restoration => Topic started by: Jazzchimp on August 18, 2005, 10:37 PM
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Apart from smacking with a 20lb lump hammer, anyone got any nifty tricks to make the job easier?
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A bb press (i personally think these take the fun out of building)
Lay the frame on the grass with the BB on a bit of wood, place the top cup in the frame and put another bit of wood on the top to hold it in place and then smack it EVENLY.
I have only struggled once.
But, its more fun when the hole is tight.
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not sure about the words cup, wood, grass, smack, hole and tight cunjure up the right images for me!
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Jazzy sand the paint from the bb brt on the frame and then grease em before installation also i like boiling water poured on the frame just before i put em in ;)
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Have a quick question on a similar subject. Which way around are the bearings supposed to sit? Open side of the race facing out or in? I know it sounds a dumb question but they seem to fit either way. This question applies to H/Set bearings too. Thanks lads!
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JAZZ, The wood and the hammer on the grass is the way i did it ,followed by squeezing them in the vice!!
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orbs spot on as usual 2 lumps of wood and hammer .works every time no probs
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Make sure the frame is free of all paint and other crap on the contact areas, cups can be pressed in using a large vice and suitable protective packers, or as Orb rightly says, beat the sh!t out of them using wood and large hammer.
Usefull tip: put cups in freezer night before fitting, they will contract just enough to make the job a load easier ;)
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Yep,hammer and wood every time! As a time served mechanic first thing i was taught,if it wont fit? don't force it,get a bigger Hammer! ;D
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But, its more fun when the hole is tight.
Can't disagree.
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Have a quick question on a similar subject. Which way around are the bearings supposed to sit? Open side of the race facing out or in? I know it sounds a dumb question but they seem to fit either way. This question applies to H/Set bearings too. Thanks lads!
Normally the closed side of the bearing faces against the cup. Bearings should only be installed after repeatedly pounding the cups with a large hammer, just to make sure they're installed proper.
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BITD I split a headtube on a GT Pro using large hammer & wood to fit a headset.
As for BB bearings-cups if they have alloy cups, I file them down so they fit in, with just a bit of interferance, they wont come loose as the cranks hold them all together & they are so much easier to remove.
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But, its more fun when the hole is tight.
isn't it always ;) ;D