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  • FGF 590: Back 2 Life, Back 2 Reality
  • Macavity
    Free Member

    Possible that it was 100mm before it landed at the tip. Might just need pulling back out to 100mm (4 inches).

    Macavity
    Free Member

    If someone can TIG weld then they can TIG weld titanium.
    But how well shielded the weld puddle will be will depend on their experience and understanding of the requirements of an effective purge, to avoid contamination and degredation of the metal.

    http://www.twi.co.uk/content/ksrjp002.html
    “The titanium expert knows that it is one of the easiest materials to weld – but he is very familiar with very good back purges, and the use of a trailing shield.”

    http://www.weldingtipsandtricks.com/welding-titanium.html
    “You only get one shot with titanium “
    Once the titanium (weld) has absorbed any oxygen, nitrogen or other contamination from the atmosphere then the damage is done. A bad weld can be dug out and redone but, only if it is done in a controlled environment.
    Welds can be dug out (dig and tig) for example if there is some tungsten inclusion (which would show up in a radiograph). But a poor weld can look much like a good weld once the surface (evidence) has been removed.

    http://www.kobelco.co.jp/english/titan/files/details.pdf page 5 (although it is almost impossible to weld titanium without some discolouration. It is experience that the is best guide to what is acceptable discolouration)

    Macavity
    Free Member

    Record WC6, plenty of copies around but none quite as good.

    Macavity
    Free Member

    Whats that, a Black & Decker Workmate with pedals?

    Macavity
    Free Member

    There are people on here that can get seatposts to bend “using only their butt cheeks..”

    Macavity
    Free Member

    He had drilled kneecaps as well.

    Macavity
    Free Member

    The clamping (crushing) force resulting from the same torque (eg 5Nm) applied to a dry (unlubricated) bolt-thread will be less than for a lubricated bolt-thread.
    The torque is a measure of the energy applied to the screw. Bolts have nuts on the end , screws screw into things (like stems).
    Lubrication will enable a greater (crushing) load to be applied to the plastic pipe for the same given torque.
    When is a plastic pipe not a plastic pipe?
    CFRP is mostly plastic, that is why its called Carbon Fibre Reinforced Plastic.
    Carbon fibre is fancy string, CFRP is plastic with fancy string in it (a composite).
    Similar to asbestos in asbestos-cement, rebar (steel) in reinforced concrete, sawdust in Bakelite, wattle and daub etc.
    CFRP is anisotropic.

    Macavity
    Free Member
    Macavity
    Free Member

    “If he’s right, then that pdf from the HSE Macavity just quoted is wrong then… “

    or possibly slightly irrelevant, its hard to argue for a locker for your own clothes if you work in a relatively clean environment such as an office. But if you work in a coal mine, foundry etc then you have to have decent welfare facilities.

    Macavity
    Free Member

    http://www.hse.gov.uk/pubns/indg244.pdf
    The Workplace (Health, Safety and Welfare) Regulations 1992
    “Accommodation for clothing and facilities for changing
    Adequate, suitable and secure space should be provided to store workers’ own clothing and special clothing. As far as is reasonably practicable the facilities should allow for drying clothing. Changing facilities should also be provided for workers who change into special work clothing. The facilities should be readily accessible from workrooms and washing and eating facilities, and should ensure the privacy of the user, be of sufficient capacity, and be provided with seating.”

    Macavity
    Free Member

    The thermal conductivity of titanium is nearly as poor as stainless steel.

    Macavity
    Free Member

    Does anyone know anything about these?

    http://www.slingshotbikes.com/mountain-foldtech.php

    Macavity
    Free Member

    After the flashyness on Beijing (ironically), Sydney, Los Angeles etc it is a chance to see how the rest of the world lives.
    But a country where people defecate in the street could make the marathon and the bike road race awkward.

    Macavity
    Free Member

    Scotland has to go because they are obliged to as the next (2014) games will be Glasgow.
    As a spokesman for the Indian games said “Dehli is in India what are people expecting, the people working on the games venue live in far worse conditions” what is the fuss all about.

    The Queens husband is indeed a fine source of quotes, this is one from a few years ago (1999)
    “It looks like it was put in by Indians.” The Duke of Edinburgh after seeing a fusebox in Edinburgh.
    http://www.hypersyl.com/forums/topic/906-prince-philip-the-duke-of-edinburgh-racist-bastard-or-comic-genius/

    He obviously meant some comment about cowboys but got a bit muddled.

    Macavity
    Free Member

    Scottish Power a fine Spanish company.

    Macavity
    Free Member

    “just got a quote from xcad for a ti road frame works out about 450 incl shipping”
    The cost of even the tubing for a decent titanium (Ti alloy 6/4 3/2.5 etc double butted tubing) is around £40 per foot (or there abouts, probably more) . A frame uses around 13 feet (if just plain gauge), if double butted then there is going to be some wastage with bits trimmed off the ends.
    So 450 quid seems acceptable and if its welded together OK then thats a bonus.

    Macavity
    Free Member

    Truvativ cannot make a decent bottom bracket, their GXP, Powerspline etc are all shockingly poor.

    Macavity
    Free Member

    Advertisers can do what they like on the internet until next year:
    http://www.asa.org.uk/Media-Centre/2010/ASA-digital-remit-extension.aspx

    Macavity
    Free Member

    http://www.schwalbe.co.uk/pdf/techinfo.pdf
    page 8
    “Generally, tires with denser fabric are more resistant to
    punctures and roll better. Yet the ultra-fine 120 EPI carcass
    is more susceptible because the individual filaments
    are very fine. The best compromise for low weight
    and resistance is around 50 to 67 EPI.”

    http://www.michelinbicycletire.com/michelinbicycle/index.cfm?event=singlecompound.view

    http://www.conti-tyres.co.uk/conticycle/technical_safety.shtml

    Macavity
    Free Member

    Norbar make some decent / accurate torque wrenches.
    But the difference between the tightness of a dry bolt and a lubricated (greased) bolt for the same torque is so great that it is still guess work what torque setting to use.

    Macavity
    Free Member

    Once an unripe tomato is removed from the plant it will not ripen, it might go soft and turn a bit red but will never ripen.
    Tomatoes need to be on the plant and in sunshine to ripen.

    Macavity
    Free Member

    Attacking titanium with acid can cause hydrogen embrittlement in titanium. Although a mixture of nitric acid and hydrofluoric acid can be used to chemical machine titanium, but will still attack the titanium.
    Heating titanium in air will cause the titanium to discolour (badly) since titanium readily absorbes oxygen and nitrogen.
    http://www.keytometals.com/Article42.htm

    Either use liquid nitrogen forced through the centre of the BB axle to freeze / shrink the BB and remove, or Loctite freezeandrelease, Wurth Rost Off, Ambersil Rust Flash, http://www.youtube.com/watch?v=b0BaowQvL6c etc

    Macavity
    Free Member

    Of Mice and Men.
    It was the cynical exploitation of plus the inducing of a complex in and then the shooting of Lennie by George that made it a nasty story.

    Macavity
    Free Member

    Bicycles and Tricycles: An Elementary Treatise on Their Design and Construction
    Archibald Sharp only had so many ideas that could be recycled over the years.

    Macavity
    Free Member

    Just use the bike.

    Macavity
    Free Member

    A few years ago Columbus advised against chrome-plating because of the effect of hydrogen embrittlement on the tubes.

    Macavity
    Free Member

    Loctite 222

    Macavity
    Free Member

    "Had to read 'Of Mice and Men' at school"
    same here.
    And its probably put a lot of people off reading for life.

    But for a bike book that has less to it than meets the eye
    http://icelord.net/bike/thecustombicycle.pdf
    some of the pictures are OK.

    Macavity
    Free Member

    Deeeeeecal
    what happened to sticker or transfer?

    Macavity
    Free Member
    Macavity
    Free Member

    It means that you are looking to give your money to a good cause, there are better, such as the British Red Cross and do not forget to use Giftaid.

    Macavity
    Free Member

    The comments about The 7 Habits of Highly Defective People does explain why deffective people recommend it.
    Zen and the Art of Motorcycle Maintenance, is a puzzling thing, what is it about nothing happens there is nothing in it. Time spent reading it is time that you will never get back again

    Macavity
    Free Member

    Also, to consider is that Italian frames Colnago, DeRosa, Bianchi, Pinarelo, etc may have an Italian thread bottom bracket .

    Macavity
    Free Member

    7mm fairly common A/K size stocked in car factors / parts shops

    Macavity
    Free Member

    "Do you think there is a market for another hand made frame builder? "
    some people do

    Interview: Will from Hammoon Cycles

    Macavity
    Free Member

    Geoff Burch has a book Go It Alone which is worth reading.

    Macavity
    Free Member

    There is some stuff on the Highpath website about crank length and the old favourite of dry versus greased tapers.
    Highpath under cycle information:
    "It is important to use the correct length of crank to ensure that your legs can work efficiently. You risk damaging your knees if you habitually use cranks which are too long, especially as you get older. 170mm cranks, which most cycle manufacturers fit as standard to most bicycles, are unsuitable for anyone shorter than the average European adult male and are therefore too long for most people in the World!
    Normally fit adult riders should use cranks which measure about 20% of their effective leg length, rounded to the nearest 5mm, whereas growing children can safely increase this figure to 22%. This length goes all the way to your hip joint and cannot be measured directly. Ask a friend to measure your height twice – first when you are standing upright against a wall, without shoes on, and second when you are sitting squarely against it. Then subtract one measurement from the other one, as shown below."
    "Always clean and lightly grease the axle tapers or splines before fitting cranks. This contradicts advice which is often given, but anyone suggesting that grease shouldn't be used either doesn't have any mechanical understanding or has a vested interest in shortening the life of your cranks. "

Viewing 40 posts - 2,361 through 2,400 (of 3,291 total)