Recent content by gkan

Hi everyone, ...and thank you for a plethora of ideas! I lean towards the initial idea, which is to use a sort of filter sheet to the inlet of the needles. I think an equal distribution in the plenum would only be useful if dynamic pressure differences were actually the reason for an unevenly...

@The Tick Hello and thank you for the prompt reply. The liquid is not viscous, it is close to 2 cP , so lets say water. Diffusing the flow was my first thought, but I was afraid it will not be enough. The very low flow rate and the comparably huge size of the needles result in an extremely...

Hi all, This is probably a concept design problem so I apologize in advance if its trivial. I need to design a manifold of 100 needles arranged in a 10x10 grid all connected to the bottom of a liquid container.The container itself has 4 inlets on top in which liquid is pumped using a...

Hi, No, I am afraid it didn't work. I did not try expancel microspheres as the temperatures were too high for my setup. Best, George

Greetings everyone, I have a general question regarding machinery design. I have noticed that conventional machines only have dovetail slides while CNC machines usually have linear ball bearings for their axes. Even really expensive and precise conventional machines like Hardinge have sliding...

Greetings everyone, I have a general question regarding machinery design. I have noticed that conventional machines only have dovetail slides while CNC machines usually have linear ball bearings for their axes. Even really expensive and precise conventional machines like Hardinge have sliding...

Hi everyone, I have designed a few linear motion systems in the past with linear bronze/PTFE/cast iron bushings (just a plain bushing with a reamed hole in the middle) using H7/g6 fit. Most of them work just fine but a couple, especially when they are loaded off center, tend to lock or wear too...

Thank you for your replies! Demon3, I was thinking about doing something like that. My thought was to mix some silver nitrate or some other substance that reacts when exposed to light and use it to create tiny bubbles in the polymer. Are you talking about something like that or did you have...

Hello Everyone, I am in need of a resource (book or guide) from which I can learn how to estimate how much a material is expected to deform as a result not of excessive stress but internal stresses or some other process that I know nothing about. This is probably novice but I cant really...

Hi everyone, I have made some laser cut parts (4 mm thick) from PMMA which have bent significantly after the cutting process.Sadly, I do have a flatness tolerance for these parts so I need to find a way to correct them. I checked about annealing processes and found this...

Hi, We have been flirting with the idea of making a large collimator lens for a flood exposure system. Now, I realize that I am probably going to fail miserably and that this is a black art etc but still, I want to give it a go. So, my plan is to try optical grade PMMA first and BK7 after that...

Hello everyone, I have already asked a couple of polymer experts about this and I didn't get an answer, but I have found time and again that if no one can help you, Eng Tips is the way to go :D Anyway, I am in need of a UV curing photopolymer that expands during polymerization. Now ideally, I...

Hello everyone, I am a mechanical engineer and my main occupation is the design and prototyping of lab automation devices. Most of these devices are intended for biological research, so I do a lot of fluid handling, laser systems, xyz stages, stirring and some magnetism. My trouble is, I was...

Thank you all for your ideas! Unfortunately I cannot limit the 0.5 hole to specific areas since there are some o-ring grooves along the shaft that need the extra material to avoid fracture due to excessive stress. However I found hollow shafts at the diameter I am looking for in...

Thank you all for posting. Dgallup, I have thought of EDM as a last resort if I find nothing else but yeah, I think its going to push production costs through the roof :( I am not familiar with the laser technology that can create such a hole, what do you have in mind? Zinov, ideally I would...