Our current supplier of a plastic molded thermoplastic polycarbonate urethane part is asking if we'd consider "upgrading" from a Arburg model 270S400-100 U press to a Arburg 270C-400-90. Differences provided by our supplier are listed below. We do not want to completely re-validate the process...
Can anyone point me to any good references for designing urethane springs or know of any applicable posts in other forums? I've found information in catalogs such as that provided by Sorbothane, but these seem to be geared to helping one decide what might work from their catalog and not how to...
I've noticed done yellowing on some tubes extruded from 80A pcu I've been evaluating. These parts are being cyclically compressed (5-10% strain) in a saline solution maintained at 90-100 deg F. The cyclic loading is being performed in a room with fluorescent lighting. I don't see this yellowing...
I have a part that is made out of a titanium alloy per an ISO standard. The issue is the ISO standard covers both the Grade 23 and Grade 5 alloy in terms of chemistry and mechanical properties. Unfortunately the supplier of this part is either not being forthcoming or doesn't actually know what...
The attached drawing is similar to a part I have. I need to control the profile of a detente on a spherical part (think construction ball locator with a shoulder) tighter with respect to the center of the sphere (datum D) and the bottom of the shoulder (datum B) to control the surfaces...
Is there a difference between the following feature control frames (FCF) to control the position of a sphere using the attached intentionally incomplete drawing to put it into context?
FCF A
|TP|SØ.1|A|B|
|TP|.05|B|
FCF B
|TP|Ø.1|A|B|
|TP|.05|B|
My instinct is that they are equivalent - the...
I have a part that I've dumbed down (considerably) and attached 2 options as to how to establish a DRF for purposes of discussion. The drawings are also intentionally incomplete. The part consists of 3 feet with a domed tip that will sit on an irregular surface. There is a also a spherical...
I have a PEEK part that is machined with intermittent stress relief heat treatment cycles per the suppliers reccomendations. This component is joined to another in the field using a thread cutting screw where a secondary stress relief cycle is not feasible. Anyone know of a way to accelerate the...
I have attached a simple surgical tool for your review. It is essentially a handle with a pin installed via a transition fit. The smaller diameter tip protrudes in through a bore until it contacts the back face of a member press fit into place via a Morse taper. The job of the tool is to break...
I have a part produced from a CoNiCr alloy. I'm looking to identify a method to check for microscopic cracks and voids. I've looked at fluorescing dye penetrant testing to limited success (i.e., even on a surface where cracks were identifiable under a light microscope, the dye did not facilitate...
I am looking at using polycarbonate (Bayer Makralon 2458) resin compounded to add colorant for some parts. Unfortunately I don't know the specifics about the colorant/additives. We traditionally EtO sterilize, but are now exploring radiation for speed. Any ideas on if I should expect...
Anybody with experience using a self cutting/tapping thread in carbon fiber reinforced PEEK (450CA30). I called the resin mfg, Victrex, and they were no help - they don't have any technical files for this application. I tried a couple manufacturers of fasteners to join plastics, such as Acument...
How are surface profile measurements typically reported? The metrology lab always reports the absolute value of 2x the maximum deviation from the basic profile. In other words if the equally disposed profile tolerance zone is .010", the calculated value would be compared against .010+0" and...
I have two choices for some shafts that some linear bearings will run along. The parts will be immersed in a saline solution at 98 deg F for 14 days. I have both 440C and 17-4 hardened shafts readily available. Any guesses on whether either I should expect corrosion of either stainless steel...
I've been exploring "galling resistant" stainless alloys. Nitronic 60, Gall-Tough, and Gall-Tough PLUS are all being considered. The melt chemistries of Nitronic 60 and Gall-Tough PLUS are similar with the exception of manganese limits. Data sheets also list the UNS S21800 designation for both...
Does anyone see anything inherently wrong or ambiguous with the attached drawing per ASME Y14.5M-1994 (and/or Y14.5-2009)? I've been staring at my drawing of a part with similar features and have been battling in my head first and foremost with the Ø1.25 feature located using a positional...
Any thoughts on whether chemically passivating type O1 would be of any benefit or be detrimental? The treatment proposed is equivalent to ASTM A967 Nitric 2 - the more aggressive of the nitric treatments. I'm thinking it won't have any positive effects (unless it does indeed remove iron surface...
My company is still operating under ASME Y14.5-1994, but I'd like to take advantage of the non-uniform profile tolerance concept in 2009. Any ideas on a general note that could be added to the general profile tolerance annotation to communicate this concept without having to transition to the...
I'm looking for industrial grade ZrO2/Y2O3 zirconia ceramic rod (8-10mm in diameter) that meets the properties listed below. I assume the properties apply to the material in its fired state as applicable. Preferably the rod would come in green so that we could grind/machine to net shape prior to...
