Tube with zero draft

[Ken Hegemann]

Anyone with experience molding round tube, 1-1/8 diameter, .080 wall 5-12 inch long with zero draft (ABS)

[Suhas]

Hello Ken,
Zero draft is tough (almost impossible) for such long tube lengths! I am assuming the tolerances are tight also. If you find the right grade with a release agent it may be possible at the lower tube lengths. But you will have a lot of reject too.
Let us know if you find a solution.
Thanks
Suhas

[Ken Hegemann]

Thanks Suhas. I had attached a PDF, did you see it? There is a long open slot that starts near one end and ends about 1/2 inch from the other end. It seems this slot will help a lot in ejection. If you do not see the PDF in my post, please send me an e-mail and I will be able to send the PDF and even a 3-D iges file. kenheg1@gmail

[Jendalf]

Hello,

you can use collapsible core if you can tolerate small parting lines inside of your shape.
Be careful about patents, this things are usually under some patent pending.

J.

[Mike7]

If the tube is closed at one end, put an air poppet valve at the tip of the core and inject air during ejection. (If I understood correctly). We've molded lots of zero taper parts this way.