Collapsible core shutting off on another face

[cpretty]

I am investigating the use of a collapsible core to get around post machining of a current part we manufacture.

Part Design - Part Drawing (simplified version)
The part has two sliding cores that shut off together. One of the sliding cores requires undercuts. The undercuts are only a portion of the diameter of the core.

The part is moulded in glass-filled Polysulphone.

I am sure this can be done, the question is really how best to achieve the end result.

I have looked into DME & Roehr versions of off the shelf cores, but reading the design manuals I am unsure of whether the cores are able to shut off on the end (it would appear not). Has anyone used one of these cores in a similar situation?

I am also looking into the possiblility of very small sliding cores in the pin, but given the size of the parts, am unsure whether this is acheivable at all.

With the wide range of experience in this forum, I am sure some has attempted something similar, so any experience that can be put to this would be appreciated.

Cheers,
Craig

 

[toolman801]

You can order a special collapsible core so that the pull bar on the core forms the shut-off area. You will have to send the design to D.M.E. or who ever you want to order from and have them build the core with an extended center core.

Robert Anderson

http://www.andersonconsultingservice.com