Howdy!
We have access to a single point lathe at a local college. We have a great ultra-precision machinist turned mechanical engineer. We are interested in iterating on some freeform optics, and looking for the shortest path to getting there. Outsourcing the DT gives longer leadtimes than...
Howdy folk!
WE have a new project that requires us to diamond turn some optics for prototyping. I'm relatively new to the optical game, so i don't even have a manufacturer of material to start with.
Please let me know if you know who to approach to buy high pmma blanks intended for optics in...
Hey all,
I have created some custom threads in my model using the helix command. Whenever my mouse overflies the feature in the tree, all of the edges of the threads are sequentially highlighted in orange. this takes several seconds for each feature, and as such, is slowing down the operations...
Hello folks,
I am reviewing a design that uses unfilled ultem as a structural component with a sustained load.
Cheap FEA (Nastran, linear) predicts low strains in the bulk at around .2%.
This part, however, requires very high physical precision, so if it creeps at all, could knock out...
Hello all,
I am looking for information about stress relaxation in unfilled PEI.
Specifically, I have a design where the sustained load induces a ~3000psi stress in the unfilled ultem. Looking for creep data for room temperature PEI to determine whether this is acceptable for long term service...
Hello folks,
I am involved an instrumentation application where molded gears are needed.
Originally, the gears were customized by a consultant using Kissoft. When we went to tooling, the molding team redesigned the geartrain using AGMA profiles (to ease the inspection).
This molding house makes...
Hello all,
I am designing a shaft detail that requires a spherical on the end of a shaft. the ball fits into a socket, which allows minimal torsional coupling, while allowing a strong axial connection, and is self centering between elements.
It's a spring biased push shaft that does not couple...
Hello experts!
I am in need to an adhesive that ca bond with a glassfilled polypro. Bond must retain up to 121C (250F)
loads are low- this will be used for a product badge, but it must remain bonded indefinitely.
anyone have any experience, please drop a link!
Or, ideally, anyone know of a...
Hi all,
I have a sliding interface with low very PV and I am looking at options for materials. It is a handheld application, so friction must me minimized. We started with ultem for concerns other than friction, but it turns out that ultem is a *terrible* sliding component. It has very high...
Hi all
I have a weird (to me) application for a "compression" spring.
If axial torsion is applied, does the length of the spring decrease or increase, depending of the direction of torque? Or does only the coil diameter change? (for my application, imagine a die-spring)
Are you familiar with...
Hi all,
I just received some springs from vendor that appear to have a rusty finish... the bag is covered in orange dust. Springs are supposed to be 17-7, and vendor provided a copy of the cert when requested.
My print says "17-7 treated to H900 after coiling". I realize now that it should be...
Hello people!
I'm reviewing a design that calls for a small steel shaft to be permanently held in place via a press fit into an ultem socket.
The aspect ratio of the interface is .67 (depth of socket to diameter of shaft)
this item needs to be repeatedly temperature cycled, but otherwise will...
Hey all,
I am looking for an electrical linear actuator... does this exist?
~4" stroke
~5pound force (less may be ok)
highly backdrivable, even when energized and commanded
low speed (1 inch per second would be ok)
I am looking for a response similar to what pneumatics would produce, minus the...
Hello all!
I have a part that was we designed for PEI 1010, including snap features and sliding (bushing) interfaces.
We are seeing more friction than desired in our assembly, so we are considering moving to PEI 4000 for some of the interfacing parts.
It would be simpler to change the main...
Hi All,
We have not worked with molded gears in the past. We will soon, and are starting the conversation about how to work it into an overzealous QC department. We don't currently have any gear inspection expertise. We have lots of experience with other precision measurement systems, and...
Hi All,
I'm looking into the practicality of adding capability to create custom springs to our R&D department.
The lead time, and cost to iterate is very high using vendors. I am wondering about both the complexity of operating a machine, and the cost of getting one.
We do not need new springs...
Hello all!
We have an interesting situation. We have a light- interference fit between an ultem shaft and a polypropylene socket. The interference creates an airtight seal, and retains the polypropylene part.
We carefully measure the force required to insert the ultem into the pp socket. We...
Hi All!
We are considering overmolding a lower melt temperature polymer over a high temp polymer substrate. they will be in cylindrical form- imagine we are molding a cap on the end of a tube. This investigation is a result of a long series of factors that I can't elaborate too much on, but...
Hello all!
I need a pushrod fabricated at a decent volume, looking for advice on methods to look into.
How to permanently join two pieces, each about 3" long.
It's a pushrod, though it intermittently rotates, so we do not want risk of self-disassembly. it needs to be a permanent joint.
Will...
Hi all! I hope I am posting in the right place- please let me know if not. and please forgive- I'm a mech E so caviots all around!
We have some consultants designing a test fixture for us. there is a stepper motor driving a mechanism rotationally for cycle testing. We are interested in...
