author

en2oh

Inbox View Profile
97Comments
Lakehead University, McMaster University, Dr G. W. Williams Secondary School
  • en2oh commented on jptrsn's instructable Build a Pneumatic Cylinder
    Build a Pneumatic Cylinder

    What kind of pressures can you get safely with this design? Excellent project, btw 🇨🇦

    View Instructable »
  • en2oh commented on ray74's instructable Clay Crucible Recipes
    Clay Crucible Recipes

    Have you got some idea of the temperature limits for these crucibles?

    View Instructable »
  • Smoked and Glazed Baby Back Ribs

    looks like a delicious recipe!

    View Instructable »
  • Making an Animatronic Tiki Bird

    Any way you could give a detail or two about how this works/is assembled/etclooks like it might be a great project... but who knows?doug

    View Instructable »
  • Transforming a 300W Sinewave DC/AC Mini Inverter to a 5000W Monster

    I think one of the problems with this design is the lack of feedback on the output stage.Particularly, as the DC voltage battery supply begins to fall, the output from the final transformer can't compensate. Not an expert, but there look to be a lot of potential problems with voltage stabilization in this design...

    View Instructable »
  • en2oh commented on Peter Balch's instructable ECG Display With Arduino
    ECG Display With Arduino

    sorry, I was listing that not for CSA approval or biomedical engineering, but for folks to look at an approach taken to isolate the patient from the device. In some parts of the world... this might be more than suitable... in Canada/USA, probably not.The project is really excellent.... and would be a nice solution to 3rd world technology limitations. But I agree, biomedical engineering device standards are, for good reason, very stringent. Take care, Doug

    View Instructable »
  • DIY Circuit Breaker Panelboard With Automatic Transfer Switch (ATS), Metering and Computer Control.

    excellent instructable! I wonder (I've not looked at the schematic yet) if this system fails safe. In other words, does it default in such a way as to prevent back feeding the grid AND when the power comes back on, protects the inverter. Thanks! Doug

    View Instructable »
  • Small Wind Turbine Generator (ALEKO WG400) Evaluation, Upgrade and Controlled Test.

    great review! Sadly, your youtube videos (and those on this page) are unavailable.Take care, Doug

    View Instructable »
  • Coping With Anterior Cervical Discectomy and Fusion (ACDF) Surgery.

    I found your instructables when searching for an automatic transfer switch. I have to say you paid close attention to your convalescence. For most, it's a blur :) That being said, you've identified the key parameters of success. Smoking is a big one. The other is motivation to commit to an aggressive rehab program. I bet physio was ecstatic when you landed on their doorstep! I hope you continue to do well. Sad that your company canned you... but when one door closes.... well, you know the saying! BTW, I thought you might be Canadian, eh? :) All the best - stay safe and stay healthy. Doug

    View Instructable »
  • How to Make and Use a Pot Chuck for Your Lathe

    Very creative interpretation of the term “pot chuck”. Is reproducibility good?thanks for sharing this.

    View Instructable »
  • DIY Cheap 1000W Pure Sine Wave Inverter (12V to 110V/220V)

    thanks for replying. have you thought about adding options for increasing DC supply bank voltage? say 24vdc Can the 1kw limit be increased with mosfet changes?Thanks for a great project! Stay safe.Doug

    View Instructable »
  • en2oh commented on jptrsn's instructable Build a Pneumatic Cylinder
    Build a Pneumatic Cylinder

    I wonder if applying self adhesive teflon tape to the pistons. the o-rings would take up any slack at the interface. You might even try a few strips of Teflon tape (oriented vertically). Great instructable. IT's exactly what I was looking for. Have you considered putting locks on each section to keep it extended when pressure if released?

    he states in the instructable that it can push ~2500lbs. not sure if this is sustained without keeping the compressor attached but it is quite impressive

    View Instructable »
  • en2oh commented on Kudelkin's instructable Manual Rolling Mill
    Manual Rolling Mill

    I don't understand how the rollers are driven. Is it simply direct drive of one roller by hand crank? I don't see any gears? One thing you could add is a belt between the thickness adjuster cranks.... a 1:1 belt drive would synchronize the two. ThanksDoug

    View Instructable »
  • Mobile Phone Endoscope Adaptor

    actually, Storz is a pretty pricey brand :)It depends on a couple things. New and Used and if new, what country did it come from :) chinese might cost you ~250usd.... new - used might be less than 200USD. This is for rigid scopes. If you want flexible, the price climbs drastically. A rigid scope is pretty much a "bore scope". IT is not possible to get disposable low resolution video camera modules about the size of a grain of rice. 200x200 pixels! https://www.ovt.com/download/sensorpdf/248/OmniVision_OV6948.pdf

    View Instructable »
  • en2oh commented on maryan_r85's instructable Pure Sine Wave Inverter
    Pure Sine Wave Inverter

    can you clarify the difference between "True Sine Wave" vs Sinewave PWM? Are they the same thing or is there a pure sine wave version? Thanks Doug

    View Instructable »
  • en2oh followed ASCAS
      • DIY Cheap 1000W Pure Sine Wave Inverter (12V to 110V/220V)
      • DIY Cardboard Steering Wheel
      • DIY PCB Shaker (Low-Cost)
  • DIY Cheap 1000W Pure Sine Wave Inverter (12V to 110V/220V)

    Thanks for sharing your project. Can you comment on HF vs LF inverter technology? Would this be considered a High Frequency Inverter? Secondly, have you considered designing a solid state transformerless output? Thanks Doug

    View Instructable »
  • en2oh commented on sparten11's instructable Sexy 6 AXIS ROBOTIC ARM
    Sexy 6 AXIS ROBOTIC ARM

    this is a terrific project, well worth a solid win!Can you please give details of the actual motors you used and the 3D printer you are using. ThanksDoug

    View Instructable »
  • Shy Mask That Shuts Up When It Sees People

    Seppy: you don't know what you're talking about! :) (smiley for politeness) I wear a mask all day. I'm also a medical doctor. If I have post nasal drip, by definition, it comes out the BACK of my nose, not the front! Sheesh. "post" op is "after the operation" "Pre" op is before. As far as nasal congestion goes, the world is a different place when you work in a dust filled environment. This would not be an adequate solution - nor would anything but a mask designed for that purpose. The reason I'm a bit cranky here is that the post seemed to take a swipe at masks in the context of public health and that is just plain wrong. Masks are not sufficient but are necessary to help address COVID spread. When coupled with physical distancing and ideally, wit…

    see more »

    Seppy: you don't know what you're talking about! :) (smiley for politeness) I wear a mask all day. I'm also a medical doctor. If I have post nasal drip, by definition, it comes out the BACK of my nose, not the front! Sheesh. "post" op is "after the operation" "Pre" op is before. As far as nasal congestion goes, the world is a different place when you work in a dust filled environment. This would not be an adequate solution - nor would anything but a mask designed for that purpose. The reason I'm a bit cranky here is that the post seemed to take a swipe at masks in the context of public health and that is just plain wrong. Masks are not sufficient but are necessary to help address COVID spread. When coupled with physical distancing and ideally, with an effective vaccine.... the numbers go down and we begin to get back to normal! (BTW, the evidence does not support the idea that the current vaccine prevents infection in others. What it does do for certain is reduce the severity of the disease you might catch)Sorry for the tangent,.... :)

    View Instructable »
  • Li-Ion 18650 Upgrade for WelchAllyn Opthalmoscope/ Oroscope/ Auroscope

    any chance you might share you Li ION battery details? The instructable seems to be about building a spacer. Thanks

    View Instructable »
  • Make Your Own Ferrite to Improve Magnetic Fields

    Nice instructable. Sorry if I missed a comment about this, but sodium silicate solution will harden when exposed with carbon dioxide. punch a few tiny holes through the toroid and flush with CO2. Hardens up much faster. Typically used for cores in hollow castings. The other thing to consider is to put the toroid into a vacuum chamber..... that will help consolidate the ferrite / Sodium Silicate mix. *sodium silicate is also known as "Water Glass" and used in pottery, concrete sealing and many other places! Good luck Doug

    View Instructable »
  • My $135 Wood Fired Pizza Oven!

    you might seal it with Water Glass... aka Sodium Silicate Solution. It's fine with head and will seal the concrete with a natural look. I'd be a bit cautious with all those SS needles. If you get any spalling, you might find a needle where you don't want it to be :) Nice build! Thanks for sharing the instructable with us.

    View Instructable »
  • Homemade Liquid Nitrogen Generator

    for the record, the gas doesn't cool because of a change of state.... it cools because of the Joule-Thompson effect where high pressure gas is allowed to escape to atmospheric pressure through a throttling valve. look at this: https://link.springer.com/article/10.1007/s10909-0...it is the pressure differential and regenerative cooling that ultimately liquefies the gas. so, the bigger the differential, the better the result. Also, the efficiency of the system increases when liquefing air rather than pure nitrogen.

    thanks for the reply. Am I correct, those are old coaxial anesthetic sets you are using to scavenge the atmospheric nitrogen gas? I'm not sure that the "ordinary" phase change refrigerator will be possible but a dual compressor using Ethylene in the 2nd stage can get to -100C fairly easily. That would be a heck of a precooler. That being said, I was thinking of taking stainless steel corrugated tubing and making a vacuum insulated line to house the stainless steel high pressure compressor outlet... I think that will make the regenerative cooling much more efficient. Thanks again,Doug

    your points, in general are well taking BUT, we are not liquefying Air. We are liquefying 98+% nitrogen. Less efficient, (as compared to air) but the risk of producing significant liquid oxygen is negligible. The other thing to consider is that the IMSmooth clearly has the garage door open. You are more likely to come to harm transporting a Dewar filled with liquid nitrogen in a closed vehicle. As far as "oxygen toxicity", no - not at atmospheric pressure. Oxygen becomes toxic when it is breathed under pressure ie in diving. The biggest risk here is the nitrogen is contaminated with argon, because this system won't separate this. Argon is not going to be a problem for most of us,

    I found some on eBay. Good price. Haven't used it yet since I have a membrane separator now. That being said, did you do any calculation on how long a regeneration path you needed for 300bar? I see you are using used coaxial Bain Circuits as part of your regeneration pathway. Is the nitrogen going back into the compressor really significantly colder than ambient? Doesn't the act of compression heat it up significantly? I'm looking to use a cheap 300bar compressor with limited output but wondered if I could get away with a well insulted 25' pathway. ThanksDoug

    View Instructable »
  • How to Make Indian Restaurant Curry Base - the Secret to Making Multiple Batches of Curries Quickly

    They’re a lot like a a famous British Indian Curry forum BIRcurries.co.uk. But they have a lot of derivatives there for specific curries.

    View Instructable »
  • en2oh commented on antoniraj's instructable Portable Laminar Flow Hood
    Portable Laminar Flow Hood

    Having worked in a glove box for a long time during my chemistry training, the other role for the glove box is to control reactive atmospheres. But from the mycology perspective, the ability to simply spray down the interior with 15% H2O2 followed by a positive pressure atmosphere of HEPA filtered air is certainly anything but a waste of time. Much of what is represented as a laminar flow chamber is really a box with a HEPA filter, blowing filtered air across the sterile field.

    hi there, nice indestructible, but am not sure how you are defining laminar flow.certainly this is a positive pressure hood. It is also HEPA filtered. But laminar flow? I don't think so. The air coming out of a HEPA filter is highly turbulent. Can you clarify this for me?

    View Instructable »
  • en2oh commented on imsmooth's instructable Nitrogen Gas Generator

    just got (finally) 20kg of CMS-240 for a psa nitrogen generator. if you had to do it again, anything you'd change? ie pressure level for the beds etc? I'm thinking of repurposing a dead oxygen concentrator to change the bed to CMS. Any suggestions?Any new projects ahead or is the OR and real life getting in the way?

    the spent gas is 'enriched' it is not particularly concentratedso, no - it won't work

    I've taken a little different approach. After months and months of disappointment looking for a supplier, I turned my hopes to ebay. eventually a 20kg CMS 240 appeared on eBay for a reasonable price (~$200 + $50 shipping) appeared.

    View Instructable »
  • this is a nice project but i think you've missed an important part. A glove box traditionally is +ve pressure with an inert atmosphere ie nitrogen gas. Similarly, the side tunnel serves to allow the transfer of items from atmospheric conditions to the inert glove box. there needs to be a second door that seals the main box when the side tunnel is open (and only opens after the tunnel is purged. On a side note, can you please detail the salt solution humidity regulation system? I'm not familiar with the setup.ThanksDoug

    View Instructable »
  • en2oh commented on drboom's instructable flash powder

    for the record, I'm a chemist and a physician. No particulate is especially good to inhale HOWEVER, hard rock miners used to get aluminum inhalation therapy to treat silicosis. Aluminum dust is a pulmonary irritant. While I've heard of asbestosis and silicosis, we didn't get much training on the dangers of "aluminosis". ?There is a lot that is unknown in the world of occupational health and welfare. That being said, there is no capris on between inhaling asbestos and inhaling aluminum powder. Where did you ever get such an idea?

    View Instructable »
  • If you're interested in something different - texture-wise, try short ribs sous vide.I had twice braised Kalbi style short ribs at Allan Wongs in Hawaii. They were brilliant! I tried to duplicate this using a 48 hr cooking time at 52C. Briefly seared before going in, they were beautiful. I finished them with a reduction of the marinade and broiled them for 10 minutes to firm up the glaze. Mouthwatering and sooooo easy to do. Well worth the effort. Nitrous

    View Instructable »
  • Is it my imagination, or did you use boneless short ribs at one point in the photos?When you braise your ribs, wouldn't you typically use a lower temperature? 350F will boil the braising liquid - not really your intent here, is it?Otherwise, a nice instructable!thanks

    View Instructable »