When you size a fastener for a load, do you typically make allowances for variation in load due to vibration?
Or would you hope that the variations are covered by a safety factor?
We are having trouble with some screw bosses I have designed...[sadeyes]
I followed the standard design guides available online.
The screw is a #4-20 plastite 45 screw. It secures the connector into a metal housing. The 2 of the 3 screws use a half slot, rather than a hole. These are both...
Does anyone have some rules? I want to make a simple 90 degree twist in some thin copper lead frames (0.8 x 1.5mm). Max twist per length? Does the cross section stay reasonably similar? Is this an ok process for volume production (200k-500k/year)
Similar to the image.
I have been working 8 years as a designer, and last week found out bearings are predominantly metric.
I designed a test jig and ordered a 0.25" bore, 1" OD bearing from Mcmaster to fit the jig. When we got the bearings they are ultra cheap garbage, with about 1mm of play. I figured I'd just...
I work for an electronics company, we use a lot of stamped copper parts. We have a power module that will get molded as a single stamped array of lead frames. This will be cropped to make the individual circuits later.
Some of the GD&T is being debated with us from the supplier. The issue is...
I am having trouble with some models forwarded by customers.
Consistently the parts come in to a single part file as opposed to being distributed in an assembly file. It is quite time consuming to try to separate their part into parts.
Is there a better solution? I am not sure what options...
I have an older part and a newer part built from the same mold. Resin batches were obviously not the same. New parts all crack easily.
My first question is; was the correct resin used? Can PBTGF30 be compared and identified from Sabic, 3M, BASIF, Dupont?
Would the FTIR test be a good choice...
Does anyone have experience with Silver Sintering? Pressureless alternatives such as Alpha's Agromax or Henkel's SSP2000?
What would the best plating for a DBC be to work with these sintering processes?
I have received a print with a Flatness tolerance attached to the Datum. As far as I know this is backward, or am I missing a second meaning or interpretation?
I generally see datums attached to a GD&T tolerance.
See attached image.
I am designing a plastic enclosure for electronics. I selected a PBT with no glass fiber reinforcement for the prototype, since it should be very predictable dimensionally.
The process engineer has raised concerns about the part "moving" when heated to 90C for 10 minutes.
My thoughts are if...
I have been asked to do some concepts for a "transfer molded" package. I am not that familiar with the constraints on such a process.
Mainly can lead frames extend out vertically in the mold (into the mold cavity), or do they always have to be flat against the parting line?
Anyone have...
I am a designer electronic systems, and have been asked to do some concepts for a "transfer molded" package. I am not that familiar with the constraints on such a process.
Mainly can lead frames extend out vertically in the mold, or do they always have to be flat against the parting line...
I was asked to spec a new computer for myself so I can allocate my existing Lenovo to a student.
I looked at a Lenovo workstation, S20
Intel Xeon W3520 (2,66GHz)
Windows 7 pro 64bit (OS)
Nvidia Quadro FX 580 32 core (video card)
6 GB ram (upgradable)
Siemens site seems quite useless as to what...
See attached image:
There seems to be little to no draft on the pins which leads me to believe it is not a die casting process.
Is it a post mold welding process?
Can anyone enlighten me?
