Plastic Design - Click Feature

[TimBow123]

We currently have a plastic display that rotates on a 3 pin bayonet system. The bayonets are toleranced at +/- 0.15mm and the display is toleranced at 0.2mm. The display has small bumps that the bayonets go over to create a click feel. Unfortuately with the current stack-up we either have no click feature or to much. Does someone else have an elegent way of creating a click feature in plastic?

 

[KENAT]

Some plastics vendors will help you design these kind of things, back in the UK I remember

http://www.mckechnie-plastics.co.uk/html/contact.htm

mentioned they did this when I was working with them on something else.

What plastic process are you using?

forum712 might get you good answers.

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[TimBow123]

Injection molding.

 

[IRstuff]

Please refrain from double posting thread334-272426

I don't think this is usually done with solid interfaces, i.e., one of the two interfaces must be capable of deforming around the other.

TTFN

FAQ731-376

 

[plasgears]

Snap fits and ratchets have been designed with the flexible member being a tapered beam and stresses in the elastic range. Some calcs are necessary.