Haynes Forums  

Go Back   Haynes Forums > Haynes Roadster Forums > Running gear
FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Display Modes
  #1  
Old 7th September 2009, 09:15 AM
Rik178m Rik178m is offline
Senior Member
 
Join Date: Feb 2009
Posts: 121
Default What are the bushes made from?

Is there different types of polyurethane? We have some at work and I'm considering using it to make the wishbone bushes but want to make sure its the right stuff.
Reply With Quote
  #2  
Old 11th September 2009, 06:56 PM
squbti's Avatar
squbti squbti is offline
Senior Member
 
Join Date: Apr 2009
Location: västervik/sweden
Posts: 198
Default

all i know is that the bushes have to be flexible & not too hard so that you dont get too much stress on the welds but i´d also like to know exactly what kind they´re made of because i´ll also be making them myself at work.
cheers
Reply With Quote
  #3  
Old 11th September 2009, 08:55 PM
Bonzo's Avatar
Bonzo Bonzo is offline
Senior Member
 
Join Date: Jul 2007
Location: Cornwall
Posts: 3,321
Wink Poly bushes !!

Polyurethane is sold by it's shore rating

80 or 90 shore should be ok.

I have heard it said that this material can be difficult to machine.

One thing I would say, my Poly bushes were definately injection moulded.

Personally, I would not know as I have never tried to turn the stuff

Heres a linky to the correct grade

Polyurethane Bar
__________________
I am not a complete idiot...........Some of the parts are missing !!
Ronnie

www.roadster-builders.co.uk
Reply With Quote
  #4  
Old 11th September 2009, 10:06 PM
flyerncle flyerncle is offline
Senior Member
 
Join Date: Mar 2008
Location: gateshead,near cobbly bit of A1 North
Posts: 3,188
Default

It has been mentioned that freezing makes it easier to machine.
It is very expensive and is it worth the effort when they can be purchased with the sleeves for about £90.
I am making my own and used UHMWPE,total cost about £30,including sleeves.
Reply With Quote
  #5  
Old 12th September 2009, 11:07 AM
RAYLEE29's Avatar
RAYLEE29 RAYLEE29 is offline
Senior Member
 
Join Date: Sep 2008
Location: POOLE DORSET
Posts: 519
Default

Hi, ive made my bushes from black delrin its probably harder than the poly bushes but i figured if some people use rose joints then a slightly harder bush should be ok

Quite happy if anyone wants to give me a valid reason why not.

I paid £15 for 1metre of delrin and £3.50 for the four 300mm peices of 19mm stainless from the scrappy

I have my own lathe so making them was easy for me (engineer 28yrs)
Ray
Reply With Quote
  #6  
Old 12th September 2009, 11:15 AM
flyerncle flyerncle is offline
Senior Member
 
Join Date: Mar 2008
Location: gateshead,near cobbly bit of A1 North
Posts: 3,188
Default

There is no valid reason "why not" ,we are building on a budget and you get the I made this factor as well.
Reply With Quote
  #7  
Old 12th September 2009, 02:50 PM
squbti's Avatar
squbti squbti is offline
Senior Member
 
Join Date: Apr 2009
Location: västervik/sweden
Posts: 198
Default

the reason not to use hard bushes is that there are alot of forces in all directions on the suspension so not only up & down but also forward & backwards & so if the bushes are too hard all that stress & force will go to the welds .
Cheers
Reply With Quote
  #8  
Old 12th September 2009, 05:28 PM
thwang thwang is offline
Member
 
Join Date: Sep 2008
Posts: 84
Default

raylee what speed do you turn them at i allso want to turn my own.
thwang
Reply With Quote
  #9  
Old 12th September 2009, 09:11 PM
onedayTM onedayTM is offline
Senior Member
 
Join Date: Jun 2007
Location: Tamworth, Staffordshire.
Posts: 207
Default question to flyerncle re bush material.

Hi there,
reading your reply on the bush material subject and would like to know what the UHMWPE material stands for and is it as good as poly bushes.
cheers
tony
Reply With Quote
  #10  
Old 13th September 2009, 07:58 AM
Bonzo's Avatar
Bonzo Bonzo is offline
Senior Member
 
Join Date: Jul 2007
Location: Cornwall
Posts: 3,321
Default

Quote:
Originally Posted by onedayTM View Post
Hi there,
reading your reply on the bush material subject and would like to know what the UHMWPE material stands for and is it as good as poly bushes.
cheers
tony

Here you go Tony

A Bit of info & online shop

I must admit, I had to find out when I read that
__________________
I am not a complete idiot...........Some of the parts are missing !!
Ronnie

www.roadster-builders.co.uk
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT +1. The time now is 05:45 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.