I have a bracket that currently fastens using a pair of 3/8-16 flat head socket cap screws with what is presumed to be the standard 82 degree taper, so the bolt holes on the bracket are countersunk. I need to mount a spacer to the face of the upper bolt hole, and need a flush/flat surface to do...
I have a small extruded airfoil I am looking to duplicate in carbon fiber (amateur garage setup). It is 6 feet in length, but with only a chord length of about 2 inches. I am looking at duplicating using a two part mold and wet layup with vacuum bagging (for the sake of this discussion, I am...
In a road-racing only situation (I know, this is a "bring me a rock" question with respect to variables, so hoping someone has feedback of collective experiences or "conservative" values), is there a practical limit on the length of bump steer adjusters, i.e. lowering the connecting point of the...
I suspect I already know the answer, but is anyone aware of a supplier who manufactures an allen/hex drive button head sheet metal screw in stainless steel?
I have found a single supplier for the RC car/plane industry, but they were available in black oxide finish only. I have located the...
A question for my Eng-Tips automotive brethren!
Background: Hill climb/time trials car. Car has a front air dam and splitter, radiator ducted through the hood, flat undertray extending back to approximately the firewall. Rear wing with large end plates. Less than ideal exhaust piping...
Is anyone familiar with a supplier who sells small quantities of aluminum airfoil extrusions (1-2 meters in length approximately)?
I am on the hunt for a LNV109A profile extrusion, but am willing to experiment with other race wing profiles for an underbody application. I have managed to...
I'm curious as to the thoughts of the Eng-Tips community as to whether we will see the Affordable Care Act have a significant impact on the Engineering Consulting industry.
For a moment, lets put aside the turmoil associated with Obamacare, and operate under the assumption that the ACA won't be...
In looking at some of the most successful hill climb and time attack vehicles, those running substantial front splitters as part of their aero package frequently have very large end/spill plates on them. Key examples would be the Peugeot T16 at this year's Pike's Peak, and several variations of...
Does anyone here have any recommendations or negative experiences with various manufacturers of induction PWHT equipment for field welding applications?
We have a project in the works where the times and temperatures involved lead us to anticipate too many ceramic heater burnouts, and...
Is anyone aware of any soluble purge products that will withstand elevated temperatures, i.e 600°F minimum?
We have a closure weld at a nozzle that must be back-purged, and the nozzle is not of sufficient length such that we can get a paper purge in without burning up the dam. Being a...
Does anyone here have experience using a pulsed GMAW process on P4 (Gr. 11, 12) material?
Using Lincoln equipment and running a downhill technique, we were unable to get a porosity-free weld using ER80s-B2 wire and a 90/10 Ar/CO2 mix.
When running the same process and comparable parameters...
Aside from the issues with carbon migration and PWHT, what are some of the other negative considerations when joining P91 and carbon steel (SA-106c) materials?
While we are forced into a current situation in which we are required to make a series of these welds, I am looking for further...
I have three materials at hand, JIS-SS400, Q435, and Q235 all for a basic structural application. The vendors supplying the steel have been less than cooperative thus far.
I have yet to find any information other than their basic composition tying them to a UNS number or ASTM equivalent...
We are having issues with all of our P91 pipe spools.
The spools supposedly have their end preps machined by the supplier after furnace PWHT. Deoxaluminite primer is applied to the end preps prior to transport, supposedly after PWHT and prior to shipping.
In the field, we are having...
This is somewhat of a debate between our home office and fabrication facilities at the moment in regards to the correct interpretation. I can't find much of the Bonney Forge documentation that has been referenced in older threads, most of which refer to B31.3 criteria.
In B31.1, how is the...
Does anyone know what aproximate dimensions would be for a 60 curie Cobalt 60 source? I was doing some unsharpness calcs using our Iridium size for our heavier wall, and we're teetering on the ASME limits with .068. I was under the impression that the source size for Co-60 was a bit larger...
On some of our heavy walled pipe, we're looking for a borescope-style inspection camera that we can snake in through the gamma plug to take a look at our welded root passes. The problem is that we'd like to be able to do the inspection without pulling off the 400 degree preheat.
We looked...
Would the welding of a bearing plate to the top of a micropile casing fall under D1.1 jurisdiction, or is it covered somewhere in ACI?
The governing code isn't listed on the subcontractor document, and we're awaiting the result of an RFI we submitted, but we'd like to make sure we have the...
Is anyone familiar with any success stories involving the Surface Tension Transfer process for power piping?
The non-technical corporate big-wigs are butting in yet again, and trying to run our narrow groove orbital off an upcoming project, despite great success as of late, with their...
Under AWS D14.4, if a welder tests on a joint combining group 1 and group 3 materials, is he qualified to weld G1 to G1 and G3 to G3 as well? 7.18.1 just states that he needs to be qualified to weld each group.
