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  1. dubc4

    Linear bearing selection for 3D printer application... dealing with parallelism of rails.

    I recently read an article about the 5 common mistakes when selecting linear guides... one of them was related to selecting linear rails/carriages with tighter internal tolerances than the mounting surface/points. So I have a general application question about 3D printers and the best approach...
  2. dubc4

    Material selection for ACME "nut" in a small scissor jack

    Thank you for the replies. I also looked at the materials of the lead screws and nuts available on McMaster Carr... bronze seemed to be the obvious choice for a lead screw nut for motion, but since the part is somewhat large and a single piece (and multipurpose) I figured bronze would increase...
  3. dubc4

    Material selection for ACME "nut" in a small scissor jack

    Hi all, I'm working on a small scissor jack lifting device, similar to a motorcycle/ATV jack. It uses this threaded rod: https://www.mcmaster.com/93410a615 The "follower nut" that will travel up and down the rod to lift/lower the scissor is currently designed as a one piece construction...
  4. dubc4

    Dimming an LED module intended for 12V nominal

    See attached. I ended up with an acceptable dimmed state by using this calculator/circuit: https://houseofjeff.com/555-timer-oscillator-frequency-calculator/ Put in my required 200Hz frequency... ended up with the following values because I had them on hand to breadboard C1:0.01 µF R1:56 KΩ...
  5. dubc4

    Dimming an LED module intended for 12V nominal

    Got it on the scope ... see attached. So yes, with 12V supply and the programmer set to 40% brightness, there is a 200Hz frequency, 5ms period... 40% on time So now I have to revisit the 555 timer circuit to do this My last little bit of curiosity is this... when I first power on the LED...
  6. dubc4

    Dimming an LED module intended for 12V nominal

    I suppose I could try and put some kind of "flip screen" to cover the LED module when I want to dim it, but the way the guys treat the equipment.. it would probably get ripped off or lost rather quickly. A little more info... so the brand of lights is Whelen if you guys didn't see the little...
  7. dubc4

    Dimming an LED module intended for 12V nominal

    Thanks VE1BLL, I would like to avoid modifying the board if possible. If I have to put together 100 of these things I'd rather not have to get into that sort of work. At the end of the day, it may just be easier to design my own board and have them made. I've done a few simple PCBs in the...
  8. dubc4

    Dimming an LED module intended for 12V nominal

    Thanks again Keith... So to bring more clarity to this topic, I took a picture of the inside of the module (back of the board is unpopulated). Main components I could identify are as follows: Controller: PIC12F683 http://ww1.microchip.com/downloads/en/DeviceDoc/41211D_.pdf Likely powered...
  9. dubc4

    Dimming an LED module intended for 12V nominal

    Hi Keith, thank you for your reply. The controller runs at 5V. I removed the epoxy covering the chip and identified its regulator with the part number. Running the module above 8V should give the regulator more than enough over head to power the controller. I have the part numbers at work, I...
  10. dubc4

    Interfacing 0-5VDC Analog Sensor with 0-20mA Analog Input Modem

    I see. So from my understanding, ground "here" and ground "there" are different. How would a common ground be achieved with two devices a great distance apart in a circuit like this? In addition to the signal wire, would you have to run a long ground wire as well so that both devices share...
  11. dubc4

    Interfacing 0-5VDC Analog Sensor with 0-20mA Analog Input Modem

    Thanks for the quick reply! Also, just for my own understanding... I've read that the purpose of the 4-20mA loop was to avoid the voltage drop / noise associated with trying to run a voltage signal over long distances. Considering that a sensor sending the 4-20mA signal may be very far away...
  12. dubc4

    Interfacing 0-5VDC Analog Sensor with 0-20mA Analog Input Modem

    Hi All, I have a SCADA I/O modem that has analog input for 0-20mA industrial style sensors. The datasheet talks about a current loop with externally supplied power... see page 27/28 here: Link I have a bunch of low cost 0-5VDC sensors here that I would like to interface with this modem. After...
  13. dubc4

    Dimming an LED module intended for 12V nominal

    First let me preface this by stating that I am a mechanical engineer not an electrical engineer. I have some basic knowledge of electronics so hopefully we can communicate in the same language to resolve this :) I have a 12V LED module (only has two leads for power and gnd) and when I took...
  14. dubc4

    Intake manifold design resources?

    Thanks for all of the responses guys. Yes, it is multi-port fuel injection and it was previously a supercharged application. (GM L67 3800 motor). The supercharger was an M90 roots style blower and was therefore taking the place of the plenum. I have an empty supercharger case that can be...
  15. dubc4

    Intake manifold design resources?

    It will be a fuel injected V6 application. Single turbo. I've researched a few things online and there is obviously great information out there. However, I was hoping for a more comprehensive collection in the form of a good book or two. Although the duct work is one of the main challenges...
  16. dubc4

    Intake manifold design resources?

    Looking to take on an ambitious project and design my own intake manifold for a project I have coming up. Has anyone come across any good resources for design criteria/considerations for engine intake manifolds? Mine will be specifically for a forced induction application. Any links would be...
  17. dubc4

    DIN/ISO standard that covers conical seated lug nuts / bolts?

    Is there any sort of standard reference that covers conical seat lug nuts or bolts? I've been trying to find one, but cannot. Any help would be appreciated. Thank you!
  18. dubc4

    Turn or mill this part? (or machine as two pieces and join somehow)

    I'm assuming the ring on the bottom is to be welded in place. I did have a similar two piece design drawn up that would require welding. I'm not opposed to it, but I was hoping there was an elegant (and cost effective solution) that could produce the part in one piece.
  19. dubc4

    Turn or mill this part? (or machine as two pieces and join somehow)

    Thanks to all for the replies. Gives me some ideas in the meantime. At my work we actually have a similar piece being made from AISI 4340 in Asia. I might be able to have this made there (easier in Al.? ) since they have the tooling. Thanks again!
  20. dubc4

    Turn or mill this part? (or machine as two pieces and join somehow)

    I'm looking to make a small aluminum cup style hydraulic cylinder. (single acting) I can't seem to figure out the best way of going about making the "body" of the cylinder. I've attached a picture of the basic shape (cross section). There are some dimensions on there in mm, but they are just...

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