Recent content by uwbsme

Hi, We have an Amada VIPROS 357 Queen Turret Punch Press. Listed in the manufacturer specifications is a "Repeatability" tolerance of +/-.001. Can someone explain what this repeatability tolerance really means? I am trying to determine the overall tolerance of the machine combining Punch...

Hello, I am conducting a DFMEA for a new product. It is a commercial appliance type product. I am trying to narrow down failure modes into groups to use as a guideline for future analysis. Does anyone have a list of failure mode groups (i.e. mechanical, electrical, etc.) to help in the...

Does anyone have any comments as to which file type is the best generic CAD format for use with SolidWorks 2009 or 2010?

CoryPad: I think I'm going to use a threaded insert that will be molded directly into the plastic part. This should also act as a compression limiter, no? The overhang condition (counterbore) you reference is part of my captive fastener feature. I need the fastener to spin free once it...

BiPolarMoment: Very low torque requirements mean that it is being fastened down with a handheld cordless screwdriver on the lowest setting. I haven't calculated the torque that equates to that. The fastener head is actually a philips pan head. The part does press against a seal. There are 6...

I've uploaded a couple of pictures of a SolidWorks assembly. The captive fastener shown is only used to hold the plastic to the metal securely, but the torque requirements are very low. The fastener is a #6-32 captive fastener. The plastic (thinner piece) is 3/16" thick Acrylic DS, and the...

I am trying to 3D model a witness line in an injection molded plastic part that is shaped like half of a sphere. Average thickness is 1/8" (Acrylic DS or Polycarbonate). We want to have a mold with interchangeable inserts, but are worried about the witness line affecting our part...

I am planning on injection forming acrylic. The material thickness of a flange on the part will be approximately 1/8". I would like to tap a hole in the flange for a #6-32 machine screw. I know acrylic can be brittle, but will it break if I try and thread it? I apologize, as there are...

You're saying If I have a #6-32 tapped hole in the metal base part, and have a #6-32 tapped hole in the lens, I can use a #6-32 captive screw. The #6-32 clearance hole messes up this concept as the #6-32 captive screw would fall right out, correct? I understand the 'room to disengage' concept...

As I'm sure you know there are various types of Aluminum, with varied levels of thermal conductivity. I have a Heat Transfer book from Incropera and Dewitt. I'll check out the free textbook again. We are already using Aluminum, currently Die-Cast A380, but we want to verify the difference in...

This happens when your company is getting into a new area of development. We want to estimate thermal temperatures analytically to try and correlate with lab testing. I was hoping to get some information on simplifying the thermal system w/o my values becoming extremely skewed. If this...

I've ordered some of the captive panel screws and retainers for testing. I've tried an item like the Bafkin Starlock, but it was plastic. This metal version will probably work better. I will try this also. Thanks a lot guys.

No this is not for school. Why do you ask?

MintJulep: We are threading into metal, the plastic lens has a clearance hole for the #6-32 machine screw. CoryPad: I don't want the screws falling out when they take the lens off for service. The idea is that the service personnel won't take the time to find screws that fall out. We want...

Hi everyone, Anyone have any ideas for retaining some #6-32 machine screws so they won't fall out of a plastic lens? The only solution that I've found, which really isn't a solution since they don't work well, is the following: http://www.mcmaster.com/#washers/=88exnq Any ideas?