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Type: Posts; User: BobL

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  1. Thread: Marble Slab !

    by BobL
    Replies
    6
    Views
    212

    My Marble slab story.

    About 25 years ago the uni was decommissioning a laboratory that included a polished marble and concrete microbalance pedestal.
    The sides of the pedestal were polished marble very similar in total...
  2. I'll have to get one and try it out.

    I'll have to get one and try it out.
  3. YES - output frequency range is 0 - 690Hz (not...

    YES - output frequency range is 0 - 690Hz (not that you run standard motor anywhere near the top end)
  4. There are indeed heaps of Apps some that a better...

    There are indeed heaps of Apps some that a better than others..
    For slower speeds there are apps that use the phones inbuilt accelerometer, some of which claim to measure up to 50Hz (3000rpm) so...
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    Cast Iron goes for ~10c a kgs so 3000 kgs would...

    Cast Iron goes for ~10c a kgs so 3000 kgs would be at least $300 as scrap.
  6. Thread: More metal bluing

    by BobL
    Replies
    97
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    10,569

    The pundits don't recommend brass as it may rub...

    The pundits don't recommend brass as it may rub off onto the steel and "may" affect the uptake of the black oxide - probably one for the purists.

    The SS brushes from those 3 packs are what I was...
  7. Thread: More metal bluing

    by BobL
    Replies
    97
    Views
    10,569

    Started doing some more bluing - this time it's...

    Started doing some more bluing - this time it's parts from a Radial arm saw that I'm doing up together with a mate.

    The parts i'm doing at the moment are the saw blade flanges, the main stop...
  8. Replies
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    We have these (Enphase) but the issues around...

    We have these (Enphase) but the issues around inverter overheating have been over come. They also have the advantage of only moving 240V AC across a roof instead of up to 600VDC. There are ~20000 of...
  9. I bought mine nearly 20 years ago - I think I...

    I bought mine nearly 20 years ago - I think I paid $20 for it back then.
    The battery lasted in it for about 10 years.

    I see they go on ebay for <$15.
  10. I just did a quick check of the Hall effect tacho...

    I just did a quick check of the Hall effect tacho readings on my WW lathe and drill press against the Laser Tacho.

    At ~1300 rpm the tacho on the WW lathe reads 2 rpm lower than the laser tacho....
  11. I'd say the 1420 rpm is a nominal RPM at rated...

    I'd say the 1420 rpm is a nominal RPM at rated level of load or HP.

    Here is the HP output as a function of RPM for a 4pole 3HP motor at 50Hz.
    The RPM is measured by a laser tacho while teh HP is...
  12. Replies
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    437

    I've made a home made disc brake on my WW...

    I've made a home made disc brake on my WW bandsaw.
    I had to lose the alternative speed pulley but it's also on a VFD so it doesn't matter
    The disc pads are from a Colt Galant and the cam action...
  13. Replies
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    305

    Table saw with high TPI negative raked teeth...

    Table saw with high TPI negative raked teeth circular blade (composite cutting blade) in a portable circular or table saw will easily cut that . If you can't access a negative raked blade then as...
  14. Replies
    7
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    437

    On my home made dyno for small motors up to 5hp...

    On my home made dyno for small motors up to 5hp Iím using a piece of spring steel from a garden hose retractor reel spring. I might even have some left - if I can find it! How long a pice do you...
  15. Thread: Brass Type

    by BobL
    Replies
    21
    Views
    418

    Looks like copper to me. In the original...

    Looks like copper to me.

    In the original application (as a heat skin) it would be pointless to add almost any metal to it (eg make it more brass like) as this would significantly degrade the...
  16. Replies
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    362

    How big a piece do you need to be able to hold it...

    How big a piece do you need to be able to hold it in a chuck etc?

    I think I have have some 19? mm diameter rod you can have a piece of.

    It may be easier if I was to turn the whole thing it for...
  17. Replies
    2
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    355

    The only way to be sure of identification is...

    The only way to be sure of identification is using something like a specialised XRF analysis device/instrument - a standard XRF unit won't pick it up..
    However, given it goes very soft on annealing...
  18. Thread: Knobs like Bob's

    by BobL
    Replies
    3
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    194

    As we used to say in second year high school...

    As we used to say in second year high school "skill plus plus"!
  19. Replies
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    494

    The old and new dishwashers and washing machines...

    The old and new dishwashers and washing machines are not that different. They have the same ridgidity, weigh about the same and have the same basic functions and bling lights. The new machines have...
  20. Replies
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    494

    We've had Asko dishwashers and asking machines...

    We've had Asko dishwashers and asking machines since about 1995.

    The first washing machine ran flawlessly for 20 years but then it developed leaks, the cold water solenoid was stuck closed, and...
  21. Replies
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    406

    Bob, I have a schmiko vacuum pump you can borrow...

    Bob, I have a schmiko vacuum pump you can borrow if you need one.
  22. Thread: More metal bluing

    by BobL
    Replies
    97
    Views
    10,569

    Carding wheel turned up today (3.5 weeks from...

    Carding wheel turned up today (3.5 weeks from Florida) so I turned up a bit of a hub with a 12mm shaft so I can use it on a few different machines with chucks.

    For removing black oxide soot...
  23. Replies
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    494

    If it's the logic board then you might not be...

    If it's the logic board then you might not be able to get the spare part as 15 years is the outside time for manufacturers to supply these sorts of spare parts.

    With our old dishwasher (a fisher...
  24. Thread: R u ok?

    by BobL
    Replies
    26
    Views
    1,446

    Shed - can't wait to see the wheelchair. ...

    Shed - can't wait to see the wheelchair.



    The early intervention and NDIS support for my autistic grandson appears to have made a huge difference over the last 18 months.
    From someone that...
  25. Replies
    16
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    1,002

    Yep agree that sticky stuff has to be removed...

    Yep agree that sticky stuff has to be removed before painting. I was put off a bit from molasses by the smell and had nowhere else to put the container except inside my shed. I tried putting the...
  26. Replies
    4
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    251

    You might not notice the OP has been banned

    You might not notice the OP has been banned
  27. Replies
    16
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    1,002

    The thing most people do incorrectly after using...

    The thing most people do incorrectly after using acetic/citric/oxalic baths is to wash parts with water - the trick is NOT to wash them with any water but just blow dry with a compressor and provided...
  28. Thread: R u ok?

    by BobL
    Replies
    26
    Views
    1,446

    I started off the New year with a sore ankle and...

    I started off the New year with a sore ankle and was diagnosed with gout but after 4 weeks and various meds it turned out to be a broken ankle and ended up spending 7 weeks in a moon boot with my leg...
  29. Replies
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    786

    By my reckoning I'm 15 years older than you :) ....

    By my reckoning I'm 15 years older than you :) . However, I taught film based photography as far back as the 1970s' and then digital from the 1990's onwards.
  30. Replies
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    786

    You have to save the image without the image...

    You have to save the image without the image specific data/properties ie delete the EXIF data.
    Normally done in an image processing app.
    Anyway I did it for you this time. :)
  31. Replies
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    If you constantly move the dremel drum sander...

    If you constantly move the dremel drum sander side to side you can create elongated or oval type profile, just don't stop in one place.
  32. Replies
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    786

    Good point - we have yet to hear from the OP if...

    Good point - we have yet to hear from the OP if the bow is "across" or "along" the strip.
  33. Replies
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    909

    Yeah thought of the filter idea, I even bought...

    Yeah thought of the filter idea, I even bought one and a ball valve and their still sitting in my plumbing bits box because ever since I swapped to ceramic seat taps the problem has not come up on my...
  34. Replies
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    If you find two I wouldn't mind one. :)

    If you find two I wouldn't mind one. :)
  35. Replies
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    909

    When a pipe breaks in our street it lets enough...

    When a pipe breaks in our street it lets enough grit into the pipes so that washer replacement (grit gets embedded in the washer) becomes more like every 6-12 weeks until the stuff finally gets...
  36. Replies
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    Great Job - It was me that fixed the image...

    Great Job - It was me that fixed the image rotation.
  37. Replies
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    909

    One of the blokes I worked with at Uni was...

    One of the blokes I worked with at Uni was Russian and he bought half a dozen ceramic valve taps back from a trip to Russia around the early 2000's where he said he paid less than $1 each for them....
  38. Replies
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    909

    These are the ones I used...

    These are the ones I used
    https://www.bunnings.com.au/shaw-mason-1-4-turn-anti-clockwise-chrome-ceramic-disc-basin-spindle_p5050154

    389400

    They still have a washer that seals off at the seat,...
  39. Replies
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    909

    Yep agree 100%. The pipes in our street are...

    Yep agree 100%.

    The pipes in our street are over 100 years old and break/leak every couple of years inevitable sucking in enough grit/sand to stick in our tap washers.
    I got sick and tired of...
  40. I often put small deburrers in a cordless drill.

    I often put small deburrers in a cordless drill.
  41. How long is each hole taking? I assume a...

    How long is each hole taking?

    I assume a "pillar drill" is a Drill press?
    What RPM are you using?
    Is it a brand new bit?
  42. Don't really understand your question. "I...

    Don't really understand your question.

    "I currently drill 4 x holes using a 5.5mm HSS countersink bit." and then what ??
    Do you break the bit, is it just going too slow . . . . . . .?????
    ...
  43. Replies
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    700

    Worth a go, but it assumes the shaft is not snug...

    Worth a go, but it assumes the shaft is not snug or close to the bottom of the pulley hole. If itís snug even a bottoming Tap wonít clear out enough thread to allow the bolt to pass through to press...
  44. Replies
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    700

    I agree with Jack, Pulleys are cheap and easily...

    I agree with Jack, Pulleys are cheap and easily replaced or turned up.
  45. Just as a follow up I've had the motor running on...

    Just as a follow up I've had the motor running on a 3HP VFD using a 10s start and it runs very nicely and only draws 600mA when free running.
  46. A number of things would have been possible in...

    A number of things would have been possible in hindsight.

    A couple of positives is I now have a 750 mm taller press and a HD boss support that should come in hand for a number of processes,
  47. This morning I took a closer look at the motor...

    This morning I took a closer look at the motor shaft.
    It has distinct circular ridges on it.
    The ridges are easy to feel with a fingernail.
    I've never seen one like this.
    I wonder if they were...
  48. Replies
    6
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    317

    I would wash it and then press some grapes in a...

    I would wash it and then press some grapes in a couple of small batches before doing bigger batches. If there is any loose stuff it should come away in the first batch or two and it should convert...
  49. Thread: Twiggy Forrest

    by BobL
    Replies
    14
    Views
    660

    Humm . . . . . . I'm not holding my breath. ...

    Humm . . . . . . I'm not holding my breath. Brand ownership might stay in Oz but once Twiggy's accountants have their say, . . . . . look at what happened to Rossi and now partially to Steel Blue...
  50. The shaft did not extend up past the big or...

    The shaft did not extend up past the big or even intermediate pulley and was inside a boss covered by the big pulley.
    389328
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