RADBMX.CO.UK
Technical & Reference Section => Tech and Restoration => Topic started by: energiza on February 11, 2011, 01:49 PM
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Right brought 2 nos acs boa.s from a fello rad member.and they are both large thread rears.so had a brain wave.tryed tap n di.ng the thread down to 6mm.not good.these are some proper solid threads on these boa.s :-\ so another brainwave come to my head.took me 30 mins :) and a presto it only bloody worked.ive done one already.so ill be taking some step by step pics of the next one i convert today.so hopefully it will help out u fella members who have them thick arsed thread ones layin about collecting dust :smitten:
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I reckon a 10mm drill would be the easiest way . Do you need pictures ?
:-)
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I reckon a 10mm drill would be the easiest way . Do you need pictures ?
:-)
+ 1 and your never going to cut that thread smaller, change the spindles its a peace of piss just dont loose all the bearings :daumenhoch:
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:D i did take one apart originaly and it took me about 2hrs to but all them lil bars##rd bearing back in,so gave up on that idea..these are to use on rider.solid as a rock
1st pic before and after
(http://www2.mediafire.com/imgbnc.php/7d42d76b264bdde48e7d26beb7b4f3a1e8381d5c31772e8f92e9a50e53c8d67d5g.jpg) (http://www.mediafire.com/imageview.php?quickkey=88yoa4x0ne5wmjw&thumb=4)
1st tools required lol
(http://www.mediafire.com/imgbnc.php/debfa7820049eabdb3df39ded97f7775a6d7d98afa75f019d83c73d4e68004e32g.jpg) (http://www.mediafire.com/imageview.php?quickkey=qn74cbdi79hd8cd&thumb=5)
use them saws
(http://www4.mediafire.com/imgbnc.php/f77a666d8c0c0ba6e20cf7f5f6f4a8d14c97f553465206da9292ddb25022bf415g.jpg) (http://www.mediafire.com/imageview.php?quickkey=4t1auai1lugstya&thumb=4)
wheres that chunky thread gone
(http://www3.mediafire.com/imgbnc.php/bea4163f565f441cdf1d624267d6e925b100c3b039f6d88b9dfcf3a4e3f0eda65g.jpg) (http://www.mediafire.com/imageview.php?quickkey=vrc93dzw456kgdz&thumb=4)
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part2 file down so level with spring holder
(http://www1.mediafire.com/imgbnc.php/2f377edc3f5ec9171aad98994a1d2005e6ac1a1c6c720128fe59af6859cdddd45g.jpg) (http://www.mediafire.com/imageview.php?quickkey=2ndirvhbfeprqyt&thumb=4)
then 3mm drillbit to start you off
(http://www2.mediafire.com/imgbnc.php/73c6d8e5fa26b3c68bfe76a0c15bb7c481cad7c079c73b9beea0c2bb387145645g.jpg) (http://www.mediafire.com/imageview.php?quickkey=1s0y870ay3m6ajd&thumb=4)
working drill sizes up from 3mm/4mm/5mm then 6mm
(http://www2.mediafire.com/imgbnc.php/670dcaead0523ce29283b5d5d8939d59fae4c6863570816884ef82f8258dfd715g.jpg) (http://www.mediafire.com/imageview.php?quickkey=c1kf9u498tnojcd&thumb=4)
not the straightest of 6mm holes,but a it works
(http://www2.mediafire.com/imgbnc.php/7831a5d3b4d55008bc23ed2d4768d0c0f0d4bc6e7daa718508357e199dee1f485g.jpg) (http://www.mediafire.com/imageview.php?quickkey=f6ldv39u1icru74&thumb=4)
get your 6mm thread,wak on some super strenght chemical metal and put in 6mm hole.leave to dry for a day and wooo a 6mm boa is born again lol
(http://www3.mediafire.com/imgbnc.php/b792440ca5c013b333101fc4c9fd2291733bad45b3d4ce97bcb0ae7f29c7aeeb5g.jpg) (http://www.mediafire.com/imageview.php?quickkey=1mfqals8f9ecavd&thumb=4)
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i'm still using the same 10mm boa for about 15-17 years. i sent it too rob ridge who would machine it out and put sealed bearings and a 10mm axle on it. i've never had a problem with it ever.
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Best brakes ever i say.the threads where 16mm nut size originally.so instead of killin a good set of forks 10mm nut thread size was the way forward for me :)
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Be interesting to see how the mod holds up under use - repeated heavy braking etc. :daumenhoch:
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Be interesting to see how the mod holds up under use - repeated heavy braking etc. :daumenhoch:
the chemical metal is usally pucker.my mate used it on his cracked forks years ago and the forks are still alive
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I stand by my original post as the best method . You have got to be mad to even consider using that brake in anger :D
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and use a centre punch before drrrrrrriiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiilllllllllllllllllllllllllllllllllllllllllllllllllllllliiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiinnnnnnnnnnnnnnnnnnnnnnnnnnnnnnggggggg. :angel:
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and use a centre punch before drrrrrrriiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiilllllllllllllllllllllllllllllllllllllllllllllllllllllliiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiinnnnnnnnnnnnnnnnnnnnnnnnnnnnnnggggggg. :angel:
:daumenhoch:i need to invest in one m8..lol
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and use a centre punch before drrrrrrriiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiilllllllllllllllllllllllllllllllllllllllllllllllllllllliiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiinnnnnnnnnnnnnnnnnnnnnnnnnnnnnnggggggg. :angel:
+ 1 :daumenhoch:
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Chemical metal? Is that some sort of glue?
You'd trust a brake thats been glued together... :idiot2:
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::) lol i forgot to say in above posts.that the drilled hole as to be tap n di.ed out.so there is a thread inside to screw the 6mm thread into.the chemical metal is a kinda glue.but its made from 2 tubes of stuff that react together when applyed to any metal source.creating a bond as strong as a weld.almost like metal.this was squeezed into hole then 6mm thread screwed in after.so should be strong enough
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11mm drill bit
(http://www.radbmx.co.uk/archive/albums/h10/fish116/drillbit.jpg)
dirt bike brake slot for 6mm spindle
(http://www.radbmx.co.uk/archive/albums/h10/fish116/6mmslot.jpg)
drill in position
(http://www.radbmx.co.uk/archive/albums/h10/fish116/drilling.jpg)
hole drilled brake installed 5 minutes later
(http://www.radbmx.co.uk/archive/albums/h10/fish116/fitted.jpg)
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:'( owwwww poor frame.i could.nt drill a frame out just for a brake.ouchhhh
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::) lol i forgot to say in above posts.that the drilled hole as to be tap n di.ed out.so there is a thread inside to screw the 6mm thread into.the chemical metal is a kinda glue.but its made from 2 tubes of stuff that react together when applyed to any metal source.creating a bond as strong as a weld.almost like metal.this was squeezed into hole then 6mm thread screwed in after.so should be strong enough
Makes more sense now... :daumenhoch:
Bof's method takes the win though... :4_17_5:
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The dirt bike deserves no sympathy. :LolLolLolLol:
but a brake that works far outweighs damage that can be done from a flipped manual :daumenhoch: