Need inexpensive precision (+/-.002") plastic bushings made

[bearisle]

I need to have some bushings made. qty 500 each
part#1
O.D.= .250
I.D.= .153
Length = .225

part#2
O.D.= .250
I.D.= .118
Length = .150

part#3
O.D.= .250
I.D.= .184
Length = .130

I have looked into:
-Off the shelf.
-Extrusion
-Injection Molding

Could not find "off the shelf"
Extrusion and Injection Molding had high prices for the low volumes.

Looked into screw machining and found cheapest, but still high. Inside Diameters are critical. I could possibly changee the length and the outside dimension...
Any suggestions. I need this soon.

 

[israelkk]

When you say "inexpensive" how much are you willing to pay for every bushing from each kind?

What kind of plastic are you talking about (Delrin, Teflon, etc.)

What are the tolerances of the outside diameters and the length?

What is the inside and outside surface finish roughness

 

[EdDanzer]

We post RFQ’s for higher volume items on

http://www.mfgquote.com.

This site should provide 20-30 quotes. If you don’t like the prices received you don’t have to purchase. I doubt you would get lower quotes any other way.

 

[makeup]

Why dont you just go down to your local machine shop. The time you are spending looking around (especially for the quantity required) it will cost you more indirectly. Maybe???

 

[strokersix]

Try Protomold

http://www.protomold.com

for low volume injection molding.

I have done business with Protomold but am not affiliated with Protomold in any way.

 

[saxon]

bearisle, In the real world, there is no such thing as "inexpensive precision". If you need close tolerance components, it's going to cost you. As the tolerance goes up, the cost goes up geometrically.

Anyway, at + - 0.002, get an oversized plastic rod of your choice, take it to a local machine shop that can work to the 0.001 and have them bore and turn it down for you.

Hope this helps.
saxon

 

[Cockroach]

Or you can forward a RFQ to my attention, fax (780) 473-0064 and specify the quantity and material type. Just for completeness, be sure to restate the sizes. Otherwise my direct e-mail is "Sturni_Hueston@Yahoo.ca".

For quantities of 500, I can have my machinist kick these off the NC with very little turnaround.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada