Recent content by reyemka

What are your opinions on when or where to use rads on plastic parts? Obviously there are locations where you need rads (ie plastic flow, base of bosses etc) and locations where you can't have a rad (ie parting line), but I'm talking about using rads on every edge or only where necessary...

Hi, We are using a teflon & silicone lubricated acetal and are experiencing issues with the teflon plating out onto the tool. The molders need to clean the tool every 8hrs to keep the parts in spec. We've tried alternate materials but have found that we really need the teflon to meet our...

Hello, I have an application with a simple journal bearing and I'm using Acetal for the shaft and Noryl for the bearing. For the shaft I have parts in both Celcon M90 and a Lubricomp grade that uses a silicone additive. There is only a small torque applied to the shaft so minimizing friction...

Pat, it is a hand held medical device with oral human contact. Could anyone comment on the feasibility of using PBT or POM? On paper they look good, but there must be disadvantages to both, I'm just not sure what they are. Thanks for all the ideas!

Pat, is a glossy finish possible with a filled PP? The increased stiffness is necessary for the design.

Pud, My experience with SAN is that it is very brittle and won't pass a drop test. Can it be modified for impact?

Thanks for the reply. I would also like to ask if anyone has been successful using high heat ABS for applications that require boiling?

I'm looking for a plastic that can withstand 200 boiling cycles (15min each). It also needs to hold a colour and be high gloss (think consumer medical product). I've tried high heat ABS with a DTUL above 100°C, but apparently HH ABS is only good in a dry heat. I'm looking for something...

I'm looking for some guidelines similar to the Machinery's Handbook Allowance and Tolerances for Fits, but for plastics?

Thanks for the advice. The proposed design is to make the shaft and paddle from one part, so I was looking at a higher flow Noryl.

It's not autoclavable, just home sterilization (100C).

Hi, I have an application where I need to use a plastic axle for a pivoting mechanism (20Hz). The axle will have a thin blade attached to one end as well. One of the requirements is cleaning in a microwave steam sterilization bag, so using a metal rod is not an option. I am considering...

Should have mentioned that it needs to be opened for cleaning, so any type of permanent bonding is not appropriate.

The snaps will be separate from the seal. I'm just showing the sealing features in the attached files.

Can anyone offer some advice on airtight interlock designs? The device I'm working on has two shelled parts that are snapped together to form a case and it needs to be airtight. It is a breathing device so the pressures are low (< 1 psi). I've attached a PDF showing the design. Thanks,