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  • Users: bob8907
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  1. bob8907

    ESTIMATING TURNS RATIO BASED ON WIRE SIZE AND RESISTANCE

    I am curious if this can be accurately done? Obviously we can determine the resistance in copper wire per diam, and determine over all resistance, BUT actually determining how many turns??? See, I think you can estimate how long the wire is but not how many turns. In sum, what I am trying to...
  2. bob8907

    Can a twin screw charger be adapted to be placed "before" the TB?

    In a custom application, we would prefer the instant performance that only a twin screw can offer. I have also not found much to support that a centrifugal type will really give any additional boost at peak rpm than the twin screw. (open to debate). Problem is we really need something that...
  3. bob8907

    Need education in gears

    We are an aerospace mfg/eng group, not experienced with gears too much. We have a design (not aerospace) that will require some gears. Wondering if there are some references, charts, etc that would help us decide on a particular tooth cut for a given radius? Basically we have some 1" shafts...
  4. bob8907

    Need ideas to align or clock shafts precisely

    Please, for example purposes, imagine a twin screw type compressor. We are making larger Al shafts and have to insert steel center shafts for the bearings on them. There are 2 of these running together and MUST be clocked together within a nats ass... Does anyone have any good ideas on how to...
  5. bob8907

    OT: compact, high HP motor for BA kitchen blender.

    OK, a bit of an off the wall question here. I am considering throwing a big motor in my blender for the heck of it. I want to find something used and cheap since this may not go all that well.. Target is 2HP min, 25K rpm. I am thinking AC/DC type motors since they usually have no rpm limit...
  6. bob8907

    Discuss twin screw vs centrifugal superchargers

    Have a few different applications but all will be higher rpm (6,000-11,000rpm) units. I really like the throttle response of screw but hear that centrifugal might have an edge for all our HP on top end. Can a properly designed and applied screw system be better than centrifugal? Design goals...
  7. bob8907

    Help measuring concentration and PH of soluble oils

    We are trying to make a DRO to display % concentration and PH of certain cutting fluids. I really have no idea what sensors we will even be looking for. We would want to build them from the bare component though. Does anyone have experience with this? FYI, the soluble oil is a unique oil...
  8. bob8907

    Need to create sensor for soluble oil % soltion monitor

    In a nutshell, we have some machining fluids that need tight control of concentration. WE already have a nice circuit for an LED display but need to incorporate a way to sense concentration. Problem I see here is there is a variety of oils with slightly different SG ratings. I would also...
  9. bob8907

    Anyone here familiar with an open source brake type dyno DAQ software?

    Not necessarily looking for something for nothing but rather trying to see if there is anything else out there that can shave some time off our software build. We will need to automate our system so edit of source code will be important. I have found several basic DAQ packages around 500 bucks...
  10. bob8907

    DAQ card. Do I need signal conditioning on the front side?

    We are looking to use a DAQ card for a dynamometer project and many of the sensor inputs the the DAQ card will be analog. Mostly tach and temp and some inductive pickups from plug wires. Just curious when signal conditioning needs to be employed? Do we need the extra protection? Is that...
  11. bob8907

    Rookie looking for advice with Labview for a Dynomometer

    We are looking to build a dyno for a custom application and considering the use of Labview as the software. I have a friend that has Labview but rarely uses it or knows much about it. I am willing to get a seat if it will do what we need. For now, all we need to do is bring in approx 12...
  12. bob8907

    Chassis Dyno. Am I missing figures in my calc? Torque looks high!

    Basically, for my own= information, I am looking at how chassis dyno torque is calculated. They all seem to come in below where the engine torque should be BUT there is ALWAYS a gear reduction to the final output which multiplies torque. For example, one vehicle I looked at was about a 3:1 in...
  13. bob8907

    REALLY NEED HELP DESIGNING AC/DC POWER SUPPLY CIRCUIT FOR PCB

    Here is the deal. We have a couple custom circuits that we are designing that use no more than 1A at 5V. Power supplies to run our circuits will vary so we want to make something that will accept say 10-100V AC or DC. Usually we might do a bridge and a reg but regs rarely deal with this much...
  14. bob8907

    DRLY FILM LUBE COATING APPLIED TO STEEL TRANSMISSION PARTS

    We have a transmission that simply will not shift under load. We increase the engine output by 300% and this creates binding in the sequential transmission. The thought came to mind to try and reduce friction on all the sliding components in the trans to help shift quality. I am looking for...
  15. bob8907

    LOOKING AT DRY FILM LUBE COATINGS FOR TRANSMISSION PARTS

    We have a transmission that simply will not shift under load. We increase the engine output by 300% and this creates binding in the sequential transmission. The thought came to mind to try and reduce friction on all the sliding components in the trans to help shift quality. I am looking for...
  16. bob8907

    Discussion of Delta 3ph services. Open, Closed, etc

    I cannot seem to get a straight answer from most electricians and I think this is mostly out of their scope of expertise and I am not an EE so hoping to get something from the horses mouth. When discussing Delta connections, some have indicated you may or may not have a high leg. I have...
  17. bob8907

    Inspection of STI or helicoil threaded holes. QA concerns

    We are making some parts that require some 6-32 STI holes and we install the inserts. We are inspecting our STI holes and our nogo side runs in about 1-2 turns. Problem is when the inserts are installed, a standard 6-32 nogo gage will go in. I realize it is usually not standard practice to...

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