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Thanks for the responses We are leaning towards running the part in delrin as was sampled. Have not run destructive tests on the unit, but was thinking we would go ahead and produce tooling and then do so with actual parts. These are going outside and will be exposed to temps form -40C to 70C...

Thanks sreid-will look into it as well.

Thanks Mike I will be able to upload some drawings of the part tomorrow and explain more about the application as well.

Thanks for the reply Gallup. We have the machined delrin parts in the field in an actual unit. We want to proceed to produce the tools in order to make more parts to allow us to test and verify the design/strenght etc. I can get you more info on the parts themselves and how it is used if it...

The parts we have in delrin work fine, not sue if the poly would be different. Concern on running one part in one and the other in another would be shrinkage possibly, unless planned for from the start.

Hi Mike-thanks for the reply. We looked at one part for both, but have limitations on mounting them in place which requires the two halves. Looking to run the parts probably in polycarb or polycarb/ABS blend. The friction between the parts with the rotation isn't as big a problem for us in this...

Thanks for the emails Mike/Simpson The mating part to the half shown is virtually a mirror image to the part. The parts rotate on each other 180 degrees to the right with a stop and then 180 degrees back. I didn't think I would need to get the details to the table on the part itself to the...

Our engineers are working on design a two part bearing which will act to support a top box and allow it to rotate and self locate by lifting up via the bearing and dropping down via the bearing. The box would weight about 70lbs and the bearing would have a diameter of approx. 4 inches We have...

We have modeled a new drive thru design involving a torsion bar system to create a rigid internal frame to withstand wind loads etc and have run some internal FEA but would like a second option by someone who does this on a regular basisi to confirm our desing will work or to recommend some...

Trying againhttp://files.engineering.com/getfile.aspx?folder=b174c46b-b809-4832-bb6f-f8a9492287b8&file=DSC05695.JPG

See atthached photos of the prot unit we have made. The catch is punted in the box and we have machined a nylon catch surface which is mounted on the frame. We have a catch and nylon ramp on both sides of the box which is about 24 inches wide. It works, but is not a positive enough lock as...

I am designing a rotating box which has a flat area and pivots on the top and bottom that aloow for the rotation and also leave the spacing for clearance above and belwo the box to the main frame. One thing we have been trying to incorporate is a catch latch which will allow the end user to...

The sheets are about 42"x25" and are held in an aluminum frame. The frame is open on one of the long sides to access graphics that slides in between the two panels. The panels are bonded with the acrylic "T" on three sides. The T is used to close the edges on the 3 sides and at the same time...

Thank you both for the feedback. The two panels ans the T are both made out of acrylic and it sounds like all should be good with that in terms of movement. I will be setting up some heat lamps to try to simulate the heat gain for summer motnhs to see how much oil canning will occur. We...

I am working on a drive thru design involving the use of acrlyic on internal panels which will be exposed to temperatures up to 70 degrees C. I know acrylic will take the heat if expansion clearance is allowed for in a frame, but I don't know if less bowing will occur if thicker as apposed to...

Thanks rb1957, sounds like all should be good then. is the J figure also an indicator of the alternate being acceptable?

Hi Desertfox-thanks for the replay. I ahve a chart for this, and I just wanted to confirm that the "J" figure is what I should be looking to compare and get assurance on this. I thought it was but not having actually used some of this for a hwile, wasn't confident.

Not sure on all the details, but in the past we have worked with nylon which is easil machinable, unbreakabe, and I think affordable

I have a torsion bar we use in our product that now is 2"x2" with 3/16 wall in HSS, hollow tube. We need to change this to 1.5"x3" with the same wall thickness. Everything else to remain the same. Will this be a safe change from a torsional strenght point of view? What chart figures could I...