Recent content by engrnick

I changed my mind, found a few things saying that you can't fuse molten aluminum with set aluminum - the rapidly created oxide layer is problematic unless the material is in an inert gas environment like TIG/MIG welding. also the temperature of the "cold" part seems to need to be heated to...

I'm curious, what happens when you pour a molten metal, or a hot metal, onto a cooler version? For example, can I take molten aluminum and pour it on cold aluminum and have it bond? or does it need to weld? i can't seem to find any info on it. I ask because I'm curious if the cold aluminum...

Good questions - wasn't even aware that I should be asking this, and this is why I'm looking for a way to learn this. catenary no paravane a certain type wave effects no submerged compliance not sure how to determine that. I understand modeling it is possible, but i"m looking for how to learn...

Morning, you make an excellent point. sorry for the confusion. I've got a towed system on the end of a cable pulled at 3 knots. I've got to find an equation of motion for the force needed to pull the system with the drag from the cable, the system and i've been told we need to be able to...

Hi all, I'm trying to work out an equation of motion for a project I'm working on. It's a towed system with a cable and mass at the end and I would like to be able to come up with an equation of motion for the system. I have the mass' drag values from some COMSOL simulations, but i'm feeling...

Hey all, Does anyone know what happened to the spekan purge tool? I have Spekan Purge 3.3 here, but I was looking to install it on a few other guy's computers but I can't find the zip file. I find 3.1 but it doesn't load right. If anyone knows where a zip file install mirror is, I'd appreciate...

Hey all, good questions: Cyclic: used once, then retracted at a slower rate than the opening. it will be inspected/serviced after that. orientation: upwards. how rapidly: to actuate within .2 seconds, and to 4-6" extension. This is for a proposal. If we can get this concept to work, I'll get...

Do you know where I can see an image of how the choke works?

Thanks guys, good to see it's possible. Right now piston diameter hasn't been determined, but an accumulator sounds like it would do the trick.. What's a good way to stop it? I was thinking an elastomer damper since it only does it once, but if you have a more elegant method, please share. Nick

How can one rapidly actuate a hydraulic piston? probably about 4500lbs,(2000kg) with a 4-6" (100-150mm) stroke distance, in .2 seconds? I don't know if this is possible, that's why I'm asking you guys, TIA.

Thanks guys, you're a big help. It looks like it's not feasible for our application. These are all considerations that will cause more headaches than it's worth - we need it to be relatively lightweight, an accumulator will add weight. Also it will be stepping frequently, forward and reversew...

That's what I was wondering - is there a method to control them so they spin the same rate without gearing them to each other? I need them to spin independently direction wise, and then sync together occasionally. This is why I'm leaning more towards electric motors.

I have a question for a design concept for a project i'm working on. I'm not a hydraulics guy, but if this works, we'll have to pull one on. I just want to make sure this design concept makes sense. We have a platform providing 3HP, 3000psi hydraulic. we are designing a concept that uses 5...

Really useful stuff Michael!! This is exactly what I was looking for.. Thanks a lot for this, I'd give you more stars if I could..

I've been using McMaster parts, but it's a hassle to keep downloading them. Swapping lengths could be easier if the parts were parametric and related to each other, rather than individual models. I'll give 123GO a try, I just got the confirmation email.