dspec_tt131 982 Report post Posted June 1 Looking for someone in auckland who can turn down some 50mm diameter solid polyurethane bar and offset drill it for some rear trailing arm bushes. Apparently it needs to be frozen to stop it tearing Quote Share this post Link to post Share on other sites
Carsnz123 3,954 Report post Posted June 2 Yes It's a shit of a thing to machine. Freezing makes it easier and having an air supply to cool your tool helps. High rake angle and razor sharp tool helps a lot too. The boys at SAS or Autoline (I've forgotten who) here in Christchurch have someone who can machine bushes and I'm fairly sure hes based up your way. Might pay to ring them. Quote Share this post Link to post Share on other sites
NickJ 3,717 Report post Posted June 2 I'm about to embark on a similar project, attempting to turn myself, this is the best info I found: https://www.nolathane.com.au/install_guides/Z5373.pdf Pacific Seals in Wellington whip up custom jobs, I can only assume that PU would be up their alley too. 1 Quote Share this post Link to post Share on other sites
cletus 35,989 Report post Posted June 2 Try Iain at autolign in mt Wellington 1 Quote Share this post Link to post Share on other sites
a.craw4d 4,852 Report post Posted June 2 Machines ok with tool steel. It's also soft enough that close enough is good enough. Enough already. 2 Quote Share this post Link to post Share on other sites
Geophy 981 Report post Posted June 2 If you pop it in the mail I can, based in Hamilton though Quote Share this post Link to post Share on other sites
nzed 1,668 Report post Posted June 10 Best results are by freezing with liquid nitrogen, and then maching with high rake super polished tool steel. Quote Share this post Link to post Share on other sites
mjrstar 2,778 Report post Posted June 10 I have machined it a bit at room temp, nice sharp tooling, and lots of speed gave an acceptable result for a Bush which is encased. (not a mirror finish, but straight an parallel with a bit of a dull look) Quote Share this post Link to post Share on other sites
Mark_Fleming 273 Report post Posted June 10 OP, before you jump, check out vesconite as an alternative substrate....self lubricating so no more squeeky/creeky corners http://www.chatfieldmarine.com/shop/Vesconite+Bushes+(Stern+Bearings).html 1 Quote Share this post Link to post Share on other sites
nvmyvl 636 Report post Posted June 15 Never heard of freezing it first.. and I machined the shit for 16 years. Depending on the hardness, then tool steel is the best To use. If you go see the boys at LEP in onehunga, they will look after you. Plus they pour polyurethane there, so if you had originals, then they can make a mould from them and then pour as many as you like 2 Quote Share this post Link to post Share on other sites
