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  • Users: fastline12
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  1. fastline12

    buck boost transformers for 240V Delta to 208V 3P?

    I have a situation where I need to buck voltage of 240-245V down to as close to 200V as possible. 200V is not a common voltage in the US so 208V may have to do. I have a couple single phase dry transformers and was considering configuring in a 3P bucking arrangement. I had to look at the...
  2. fastline12

    Inrush, transformers, and potential energy in induction motor.

    Have a few odd question and figured I would roll them all into one. 1. I believe a running but unloaded 3P motor on a electric service has the effect of damping inrush seen by the power company when another motor starts up? IE, the already running motor helps start the next motor. Is...
  3. fastline12

    Pleading ignorance. Difference in induction motor vs generator?

    I am sure there might be some basic adjustments to optimize one or the other like bearings and such, but I was sort of lead to believe there are quite a few differences here? It was my understanding that these are effectively the same thing, just depending on which side of synchronous rotation...
  4. fastline12

    How to mitigate regenerative power from VFD running on a rotary phase converter?

    First of all, this system is currently functioning fine but has come to attention that VFDs with regenerative braking as opposed to using a braking resistor, may not be able to sync power back to the line if using a rotary phase converter? Testing revealed a DC buss on a VFD with a nominal...
  5. fastline12

    Land surveying units in Catia drafting?

    I was asked to regenerate a basic land survey in the USA. I have never done this and went to Catia for this, as being most familiar with the drafting work bench. However, I realized this will not be an easy task because the units common to the surveying world are unique and does not appear to...
  6. fastline12

    Catia users? Generate predefined shapes in drafting?

    Cannot say we have ever run into this task and hoping someone has an idea. Basically we are designing a part that requires multiple pieces of sheet metal on it and as a quick guide for the fab shop, we would like to provide a simple layout of how the sheets should be arranged. The sheet...
  7. fastline12

    Method to install strap steel diagonal shear restraints on wood frame building

    We are working on a wood post frame construction building with corrugated metal sheeting. Though the corrugated sheeting functions to provide shear resistance, we want to supplement this with strap steel diagonal members in key areas. We want to install this low profile product directly to the...
  8. fastline12

    Maybe some "off" questions about condensing steam generation system.

    Trying to help a friend out with a boiler system he is working on. Though he has the background for the thermodynamics, neither of us have experience with steam systems so some of the hurdles I am certain are already pretty standardized. He is building is own double acting piston engine and...
  9. fastline12

    Across-the-line motor starts vs VFD starts seen at Power Co.

    We have an issue with power and see no way around it but to bend the rules if we can. Our power company has provided us with plenty of "ampacity" but then goes on to say "nothing larger than 10HP on the line". This is a rural area. I have asked the question about VFDs as I assume their only...
  10. fastline12

    Wood column backfill considerations and allowable soil bearing capacity

    Just about to break ground on a post frame building for out new shop and have to make some decisions. 1. The columns will be embedded in the ground approx 5ft. The columns are of course CCA treated. Our original plan was to coat the bottom of the column with something like spray in...
  11. fastline12

    Embedment depth/diam for post frame building. Something does not smell right.

    We are working out some calculations for depth and diameter for posts in a post frame building. We are coming up with some rather ridiculous values. Not off the wall, but certainly way conservative. So we decided to examine something that works.....electric poles. By our calculations and...
  12. fastline12

    Electro seismic testing for water sources.

    This is a bit outside our area of work and experience but we are exploring this technology simply to learn about it and to test a large site that we own. I am curious if anyone here is experienced with this enough to offer help, information, or reference links so we can absorb this stuff? It...
  13. fastline12

    Shear thru thickness of plywood in plywood-timber I beam not computing.

    Threaded deleted. We found what we needed. Thank you!
  14. fastline12

    Fanuc VFD acting up on CNC machine. Chasing down culprit.

    This is a full Fanuc VFD/motor unit for a spindle. The spindle is high mass and accelerates/decelerates constantly. On slower RPM accelerations, I can hear pulses of acceleration from the spindle rather than smooth. Once the motor is running around 2000rpm, it runs smooth through RPM changes...
  15. fastline12

    Plywood shear in glulams

    Working on a glulam configuration using Plywood, similar to an I beam configuration with flanges being dimensional DF, and plywood web. I seem to remember a standard that detailed a potential allowable increase in glulam but I cannot find it. Right now we are designing right out of the books...
  16. fastline12

    Assessing purlin "slip" in wood post frame roof diaphragm with flush purlin system

    Still working the design of this post frame building. It uses wood roof trusses on 12' centers, and purlins on 3' centers, on edge and in joist hangers. This system is well proven for good roof loading and good strength but apparently takes a hit in stiffness due to the way the purlins are...
  17. fastline12

    Radiant slab heating. Heat loss to soil, insulation, efficiency. Probably over thinking.

    Trying to design the tubing network for a slab on grade. The way I am calculating things is heat loss for all walls and roof, excluding the floor. Then I calculate the BTUs required for the space and start getting a general idea of how much water and dT I will need. It looks like my worst...
  18. fastline12

    Ways to improve stiffness of wood frame roof diaphragm. Smart ideas

    We are still working out some details on a personal building. This is a post frame building, trusses on 12ft centers, and recessed roof purlins on 3ft centers, in joist hangers. The stiffness values coming from this setup is not ideal and is loading too much into our columns. I need to...
  19. fastline12

    Drag coefficients and shear performance of metal roofing for building diaphragm loading

    Trying to finalize some numbers for wind protection of a building. I need to account for diaphragm action of the building to better estimate wind load ratings. I am looking for any standards or help in determining the proper drag coefficient to use here and how I might account for the shear...
  20. fastline12

    wood adhesives for glulam components

    We are building some glulam components for a personal building. I am finding it difficult to source a product in the USA. We are primarily targeting a single part adhesive that will air dry without heating. I am open to 2 part adhesives but the air dry will be a stiff requirement. We will...

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