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  • Users: vono
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  1. vono

    431 stainless steel magnetic properties

    I have a part that I need to make and the design calls for 431 stainless steel because of its magnetic properties. This part will hold another mart that is magnetic. I am having a hard time finding 431 stainless. Would 409 stainless steel work for this? Are all ferritic stainless steels ( 409...
  2. vono

    90mm x 90mm aluminum extrusion identifer

    Thank you DBronson that is exactly what this is... Cheers J
  3. vono

    90mm x 90mm aluminum extrusion identifer

    I was able to get some of this 8020 style extrusion framing for free. But I can't seem to identify the manufacture. It is 90mm x 90mm. It is not 8020. Does anyone know who makes this?
  4. vono

    helium flight tube for x-rays to pass through

    Yes a balanced bellows system would be the best idea. I could make the bellows out of any material as long as it can hold a slight positive pressure of helium for a while ...and is flexible enough. thanks for the input! I have J
  5. vono

    helium flight tube for x-rays to pass through

    We are trying to design a low cost expandable flight tube that can cut down the air scatter of x-rays. This flight tube need to expand like a bellows from 100mm collapsed to about 800mm fully extended. It needs to have a inside dimension of 300mm x 300mm square ( it could also be round). I was...
  6. vono

    thermal imaging thru a glass viewport flange

    Would a thermal imaging camera work looking thru a Fused Silica (UV) Viewport flange? like this one https://www.accuglassproducts.com/fused-silica-uv-viewport-133-cf-flange?category_id=2781 thanks, J
  7. vono

    I have a question about vacuum pres

    No school question..... it is only part of an issue I have pertaining to the direction of said window... I have a beryllium window that has a vac side and a atm side and if the vacuum pump fails on the vessel side I need to know if the window will hold and also I need to know the force during...
  8. vono

    I have a question about vacuum pres

    I have a question about vacuum pressure differential ...so I have a pipe connected to a chamber with a thin beryllium window separating them and on the pipe side the vacuum is 1x10 - 4 torr and on the chamber the vacuum is 1x10 -7 torr . So I would calculate there is a difference of 1x10 -3...
  9. vono

    vibrations translated from floor thru a Kinematic mount

    The new location that I need to move the device into is not negotiable. There will be vibration testing done next week so I will have a baseline to reference from. If I just increase the ball and groove size will this help? I do notice some wear on the vee grooves so now is the time for me to...
  10. vono

    vibrations translated from floor thru a Kinematic mount

    Thank you for the thoughts and information. Yes I know this frame is not on a true Kinematic mount but it is what I have to live with at this time. I suspect there are several reasons for the lack of repeatability ( under size ball point, wobbling in the post that supports the balls, frame...
  11. vono

    vibrations translated from floor thru a Kinematic mount

    I have a very very sensitive x-ray microscope that weighs 4600 lbs. this device is designed to be move in and out of position. It is currently sitting on a 4 point kinematic mount with 4- 1" dia stainless steel balls on every corner. ( 3 corners drop into corresponding vee block and one corner...
  12. vono

    very small holes in Tungsten

    Great ideas all- thanks ...I have never use that the slurry flow-honing procedure" might be an option. I have to look into that , thanks btrueblood. As for stacking in a fixture, I am working on two possibilities: 1) have several thinner wafers made and stack in a fixture 2) I am going to try...
  13. vono

    very small holes in Tungsten

    Yes - National Jet responded " Unfortunately, we are not able to make the holes that you have requested. I am sorry that we cannot help this" I was able to have Midwest Tungsten EDM ~50micron holes with some success and that is about the limit. As I said in an earlier post the LASER cut hole...
  14. vono

    very small holes in Tungsten

    I think that tungsten is too thick (0.300mm)for that!
  15. vono

    very small holes in Tungsten

    thread281-278396 It has been almost 5 years and I am still trying to get these small holes drilled in Tungsten ( see thread) Basically ~5 - 10 micron hole in .300mm thick tungsten. Needs to be a straight thru-hole no taper and smooth edges. ( laser leaves a rough edge and a taper) I am using...
  16. vono

    thru hole in tungsten

    thread281-278396 Does anyone know how Pt or Mo Electron Microscope apertures are made? as in these http://www.2spi.com/catalog/apt/disc-apertures.html I need this in Tungsten but with a single thru hole not stepped. Thanks
  17. vono

    thermal transfer of copper braid

    Wondering if anyone has prior experience with cooling with copper braids? I have a OFHC copper block that is 100mm x 20mm x 20mm being hit with 30 watts of x-rays. I am cooling this block via indirect cooling with copper braid . There are 4 copper braids that are 1/4" dia and 6 " long. (...
  18. vono

    very small holes in .300MM tungstem

    Yes it was an excimer laser, but the edges were not perfect. I am looking into the photofabrication. This may be the way to go , only thing is that they can not work on tungsten or platinum, only molybdenum and this is an x-ray aperture so it will need to be substantially thicker. thanks all
  19. vono

    very small holes in .300MM tungstem

    I need to put several small holes in a piece of .300mm thick X 1.5mm dia tungsten. The holes need to be arranged in a succession of sizes from .005mm - .020mm dia. I have tried laser cutting but the edges are very rough and I need these to be a perfect circle. All of my EDM vendors say that they...

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