emsfactory
|
| posted on 14/9/07 at 10:30 AM |
|
|
Machining poly bushes?
Morning chaps.
I popped into my local engineering place yesterday to see if they could make me some mild steel outers and stainless crush tubes for my suspension. I
showed him the top hat bushes they were for and he asked if I want them made up too.
I didn't know you could do that as they look cast. He rekoned if I got the type of plastic they can cut it.
Is it OK to do this?
is it a certain type of polyeurathane to make suspension bushes?
If they can do it it may be a bit cheaper than whats available so I'm pretty interested.
Any Ideas?
|
|
|
|
|
iank
|
| posted on 14/9/07 at 10:37 AM |
|
|
Yes it's OK
Don't think you need a specific polyurathane but make sure the shore rating is right for your application (firmness)
I believe the trick with machining it is to freeze it and work it while it's still hard.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
|
|
|
3GEComponents
|
| posted on 14/9/07 at 11:32 AM |
|
|
Taken from the superflex site:-
These helpful hints will ensure safe, accurate machining of polyurethane rod.
1 - TOOL: Parting tool must be in the form of a razor sharp knife blade. The machining tool should have a 30 degree rake on the leading or top edge.
Use of light oil will assist deep parting off.
2 - SURFACE: 500 ft/min e.g. - 2000 RPM on 1" bar.
3 - LENGTH RATIO: Simplest to machine with 2:1 diameter to length ratio, e.g., 2" solid rod projects 4" out of chuck. (The poly rod will
move away from the tool if any lower).
4 - TRAVELLING STEADY: Don’t use traveling steady when machining long tubular lengths. The friction created where the steady comes into contact with
the rod, will melt the polyurethane.
5 - MANDREL: When machining outside diameter on long tubular parts, machine on a "Mandrel".
6 - DRILLING: When drilling, force drill into rod to create required internal diameter, then allow drill to dwell for a smooth finish. The
polyurethane material will actually melt to size.
SPECIAL NOTE: When working with 70 Duro, for best results and for ease of machining, place rod to be worked on, into the freezer section of a
refrigerator the night before.
SAFETY PRECAUTIONS
• When machining any polyurethane component DO NOT INHALE
• any vapour or smoke which could be created.
• Always wear protective clothing and glasses
|
|
|
emsfactory
|
| posted on 14/9/07 at 11:55 AM |
|
|
Could be a goer then.
|
|
|
andrews_45
|
| posted on 14/9/07 at 05:20 PM |
|
|
make sure you use the correct grade polyeurothane, the wrong type could split
|
|
|
emsfactory
|
| posted on 14/9/07 at 10:36 PM |
|
|
Dont know anything about grades of eurathane.
How do you find out whats the right stuff?
|
|
|
emsfactory
|
| posted on 19/9/07 at 03:25 PM |
|
|
Been in and spoke to the boss who said me cant really be arsed turning the plastic. Says it makes a real mess of the machine. He did all the other
bits though.
Ah well.
|
|
|
