I'm building a test jig that needs an air pressure regulator with a very large turn-down:
Inlet pressure range = 80 to 120 psig
Discharge pressure range = 1 to 130 inches of water (0.036 to 4.7 psig)
Discharge flow rate demand = 0 to 150 CFM, with the maximum d(flow)/dt = 800 CFM/s
I've sent...
I have a 5/8" orifice solenoid valve controlling room air with a differential pressure varying between 0.1 psi and 5.0 psi. Attached to this post is a sketch of the valve: Open, Closed, section Closed, and detail of o-ring Closed.
Even though the pressures are very low and the resultant force...
My company is designing a production line for a new product. Two of the parts are aluminum near-mirror images of each other, and were to be assembled with adhesive. The customer change-ordered the fabrication to be welded instead.
Sketches of one of the two parts is shown below. The...
Hacksaw,
Thank you for your comment! You're right, a tray of bobbins going through an oven might be the simpler solution anyway.
Any thoughs on the quality of bond produced by the polyvinyl butyral overcoat versus vacuum infusion with varnish or epoxy?
Thank you again,
David
I'm winding a set of coils from 37 AWG magnet wire with a single-thickness polyurethane/nylon combination insulation (NEMA MW29-C) and a bonding overcoat of Polyvinyl Butyral.
The bond overcoat can be made liquid with either Isopropyl Alcohol or heat. If heating, then a temperature of 110 C to...
Greg and Mike,
Thank you very much for your answers!
Greg, your comments about the spring mass damper equation producing results that could be interpreted in the frame of material properties and your suggestion to bracket the problem in the lab (a divide-and-conquor approach) are very well...
I have a 22 gram mass steel actuator hollow rod that slides on a rail. At the end-point of its travel, it collides with a solidly mounted steel plate. Just before the collision, the actuator rod is travelling at between 2.3 to 3.3 meters/sec, depending on other factors, so it posesses kinetic...
Do dry film lubes last very long? I've used molybdenum disulfide based lubes in the shop, but I don't really have a good idea of their longevity. Are they easily scraped off by sliding action between two parts?
Dave
There are no lubricants in the device. There's only one moving assembly, and it's interface is 410 SS sliding on brass rod bearings. Velocities are small, as are forces. My customer asked for no lubes: the environment tends to be dusty and servicing these devices is problematic.
Thanks...
I'm sorry, I should have mentioned that the fastening used within the product was a combination of:
1) 302 Stainless screws,
2) Press fits (interference fits),
3) Cyanoacrylate adhesive on sliding fits
Thank you!
Dave
I've started a small design company, and I have 3 corrosion questions on my first product.
It is a mechanism about 1/2 the volume of a can of Coke. The parts are made of the following materials:
1) 260 Brass
2) 410 Stainless, powdered metal, 85% density
3) several different polymers
4)...
Terrific; thank you all very much!
1. I've looked at the Dolph's link, and will call them tomorrow for more information.
2. I'm checking ThomasNet for VPI equipment manufacturers, and should have those narrowed down pretty quickly because I believe our application is small relative to some...
ElectricPete,
Thanks very much for the process description!
I'm interested in a much smaller coil than you describe, about the size of the end joint of your little finger, but I don't see that the smaller size would greatly affect the overall idea.
I've got a couple more questions, if that's...
MagMike,
Thank you very much! I will use 0.85 as an approximation, multiplying only the magnetic flux density values, not the magnetic field strength values. (Sorry for the clumsy wording in my original post.)
This is great! It's wonderful when something that seems like it ought to be true...
I'm designing several small parts in 410 or 416 stainless, to be manufactured in powdered metal. It is common to specify the density of a part to be 80% to 85% of theoretical (solid) density. Higher densities, essentially to 100%, are achievable, but all these are much higher cost: initial...
