
Originally Posted by
MTUHusky
The bad news is that Acetal material likes to stick to cores (i.e. a steel rod), especially if it is not heated and cooled properly.
So its only 8mm long and 2.5 mm diameter. To minimize deflection you should have a length that is less than 2 x the diameter for a blind hole that has a diameter less than 4.5mm. So you are a little over, if you attempt this I would verify your wall thickness all the way around the part as your rod may shift to one side or another due to plastic pressure deflection. At a 2.5mm diameter, cooling channels are probably not going to be an option but at this small size, it may not be an issue. You could always have several rod inserts made and when one comes out just drop it in a bath of cold water, plastic and all, and it should pop right off. Acetal is Hydrophobic so you dont have to worry about the part absorbing water.
Mold release sprays will be a great help if you can use them on your product.
Hope this helps,
Husky