Hi, I'm building a model of a conveyor assembly and I want to control some of the part sizes in the assembly through excel. Does anyone have an example project where the assembly was controlled through excel I could download and learn from?
I installed ST3 on my computer and the pan doesn't move smoothly. When I hold the mouse wheel down to pan around the part it's very very jittery, and doesn't look like it will move until I release the mouse wheel and then the part is in a new position. I'm not sure if I need to change a...
Hi, I have a new job where I need to take CAD models and create manufacturing drawings for the parts.
Are there any books that teach how to make a manufacturing drawing? I have a copy of the ASME standards, but they don't teach how to make a "nice" manufacturing drawing.
I don't want to...
There's a tour at UOIT of their massive wind tunnel. Click the link for details.
http://forums.sae.org/access/dispatch.cgi/SBD_pf/showFile/106021/d20101112174000/Yes/UOIT+Wind+Tunnel+Registration+Flyer.pdf
Hi All,
I'm confused with pf. I have a 50W switching power supply that I measured a pf of 0.5.
Does that mean that mean if I connect a load to it it will require double the amount of current to run the device, so it will will be operating at 100Watts?
This doesn't seem right. Someone set me...
Hi All,
I wanted to make an LED PCB that will last outdoors. It will be in direct contact with the environment.
Is there a spray I can use on the PCB that is clear so the LED light will come through and will protect the PCB from rain?
I was thinking clear coat that is used for paint, but...
Hi All,
What is the equation a tv uses to make white? I ask because 100% of red green and blue doesn't make white. I read that 59 percent green and 30 percent red and 11 percent blue makes white.
Does anyone have a more detailed link about this?
Just a question about grease. I have a rotary table with bronse bearings and they say in the instructions not to use grease.
I thought grease was good all the time?
Also we have been greaseing belts on our machines to bring the noise down. Does greasing a belt make sense?
I'm trying to...
I have an LED that has 4 1mm chips inside it, RGBA. When I use a standard luxeon LED lens the beam angle doubles because the led chips are all offset from the center by 2.5mm. It's a result of the light being reflected internally and exiting the lens not in a straight beam but more at an...
Hello All, I'm trying to find power cable that is like speaker cable. 2 conductor side by side, the same stuff that comes with a wall transformer, or any DC power supply. I'm looking for something less than 18AWG. I see this stuff everywhere, it's right next to me, but I can't find anyone...
Hello All, I'm making a little pneumatic press, I want to limit the speed of the ram so I put an adjustable restrictor in the line to the cylinder. I have set it to the speed I want, but my question is have I also decreased the amount of power the ram can do because I've decreased the speed...
Hello All,
I wanted to know if there is a way to protect RS485 IC (75176) from high voltage such as 50V because if I get a spike on my lines my 75176 chip blows.
Can you simply hang a 15Volt zener on each line to ground to sink the 50V or put a fuse in line with the lines? It has to be PCB...
I have to select a mechanical switch to switch 4 rs485 lines. I see that the short circuit current for a rs485 transceiver is 250mA, so I will need a switch for 1A continuous worst case.
But how do you figure what the switching current for the switch should be?
Hello All,
I am doing some experiments with heat sinks so that I can find a high efficiency design for my application.
I was talking to a mech friend about heat sinks and making them more efficient and he said that the CONICAL shaped fin is better than the TRIANGLE shape. He also said that the...
Hello All,
I have an interesting problem with a power supply I put together. I bought 12 switching power supplys from a company called Sinpro. The output is 48V and 1.7A. The input is 120V. I connect 2 in parallel through a diode so that I can diliver more current to my load, and I have 6...
I'm trying to find the juntion temp of an LED. I found a method where you run a small current through the led and measure it's forward voltage, then increase the current till the led heats up, then turn the current back down to the inital current and measure the forward voltage again. Then the...
Hi all, I'm an ee looking to understand some thermo so that I can do some calculations. A colleague at work said that a heat sink could remove more heat than a water cooled system with a radiator, and he said the heat sink would be smaller than the radiator? (both have fans) I've never thought...
Hello All,
I'm new to this forum and SolidWorks2004. I'm in the process for trying to build a custom computer case for a mini-itx mobo and learning SolidWorks to design it.
I made my sheet metal case, then flattened it, cut my holes and when I UNflatten it all my holes are gone and...
