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Type: Posts; User: BobL

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  1. Replies
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    I cut my own One of my "other" hobbies is...

    I cut my own
    One of my "other" hobbies is milling timber.
    382950


    Plus I have a special jig for cutting all manner of blocks and stumps so the two ends are parallel.
    These are horse slalom...
  2. For about the 9 months when I was the...

    For about the 9 months when I was the "unofficial" sparky for the mens shed I used to routinely check the electrical safety of donated equipment. I estimate about 1 in 3 machines needed something...
  3. It's pretty easy to visibly see the difference...

    It's pretty easy to visibly see the difference between most BSP and BSPT taps. The BSP will have most of the tap more or less parallel whereas the BSPT will show visible increase in diameter all the...
  4. Thread: Too holder screws

    by BobL
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    When I use a conventional tool post I have...

    When I use a conventional tool post I have noticed the problem that Joe refers to.

    This is a rather obtuse way around the problem and its not going to help you much directly, but it shows a...
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    I thought I should ddd my Anvil to this thread....

    I thought I should ddd my Anvil to this thread.
    Gets used a lot - not so much for smithing
    382932

    And my Swage Block.
    I've used it only a few times
    382933
  6. Replies
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    Good point but the idea is to have as uniform a...

    Good point but the idea is to have as uniform a path length for water to pass through as possible which grooves would seemingly contradict. Proper coffee machines have what is know as a shower screen...
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    That could still work and even be might be more...

    That could still work and even be might be more cost effective.
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    Whenever he is around I try to talk about welding...

    Whenever he is around I try to talk about welding with my BIL boilermaker/boat builder. He likes to take a lot of photos of what he does and he he really explains in some detail how he does his stuff...
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    I've looked into these sorts of things and may...

    I've looked into these sorts of things and may even go back to them in the future. They typically have reasonable efficient frequency production in the normal hearing range (20Hz to kHz) however...
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    That Wallis apron looks good and I particularly...

    That Wallis apron looks good and I particularly like the back straps.

    Strap designs are often overlooked and can be important

    Aprons that have two separate straps, one around the waist and...
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    Here are the two aprons. They don't look that...

    Here are the two aprons.
    They don't look that different but the black one one is bigger overall than the grey/tan one

    The tan one is a stock Makka's apron.
    I mainly use this one for woodworking...
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    Thanks BJ. Iíve researched vibe motors and played...

    Thanks BJ. Iíve researched vibe motors and played with some small one used for haptic feedback such as are used in mobile phones and various game controllers. Some of these are very powerful but I...
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    I have two aprons. The first one had limited...

    I have two aprons. The first one had limited upper chest and under arm area protection so angle grinders would sometimes set my shirts on fire in these areas so I had one custom made by Maccaís...
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    Thatís exactly where Iím eventually headed but...

    Thatís exactly where Iím eventually headed but Iím doing the above to test things out first.
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    The length of tool steel hanging out in the...

    The length of tool steel hanging out in the breeze or distance between the workpiece and the tool post is also asking for a lot of trouble.
    I would make that as short as possible ie <10mm
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    More coffee nerdy frippery. . . . . stop here if...

    More coffee nerdy frippery. . . . . stop here if you are not into "frippery" - go and find something more useful to do with your time :D

    One of the aspects of making espresso that seems to get a...
  17. Thread: Theater Trailer

    by BobL
    Replies
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    583

    I would forget the methylacrylate as it's too...

    I would forget the methylacrylate as it's too brittle and will eventually break in this application. A substitute could be polycarbonate (PC) which is more UV resistant and much tougher enabling...
  18. Thread: Turning aluminium

    by BobL
    Replies
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    459

    I use a regular (not sawtooth) Forstner bit often...

    I use a regular (not sawtooth) Forstner bit often on Al as it generates a REALLY NCE FINISH. It works easily enough up till about 25 mm diameter bits but above that it gets harder. A 50 mm Forstner...
  19. Thread: Turning aluminium

    by BobL
    Replies
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    459

    Good work! TIP, when using a hole saw in thick...

    Good work!

    TIP, when using a hole saw in thick metal (or wood ) drill several 1/2" holes all the way through on the waste side just touching the hole edge. This helps clear the swarf so you don'y...
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    Interestingly the BOC guidelines state. Why do...

    Interestingly the BOC guidelines state.

    Why do they say "preference" instead of "Do not use"?

    Anyway I'm surprised no one has mentioned a trailer. You just need one with a sturdy tallish cage....
  21. Thread: Turning aluminium

    by BobL
    Replies
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    459

    Chatter suggests the speed is too fast. ...

    Chatter suggests the speed is too fast.

    Sometimes you have to face facts that you don't have the equipment to go the job as quick as you would like and you have to go slowly.

    I would use a...
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    This is a problem for (but not restricted to)...

    This is a problem for (but not restricted to) many budget end VFDs. My recommendation is not to buy a VFD unless you can read and sort of understand the manual.

    The HY manuals have had some errors...
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    Use a Dremel with a thin kerf cutting wheel to...

    Use a Dremel with a thin kerf cutting wheel to cut through the small steel flange.
    Apply lube and lightly Heat the plastic with a hot air gun and that should be enough to get it off.
    When replacing...
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    Yes indeed, a very clever idea. Not a valve,...

    Yes indeed, a very clever idea.

    Not a valve, but something similar (a small piston) made from cheap SS bits I made for a low pressure calibration system of a pressure sensor earlier this year....
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    Good to hear you have it sorted. You can now...

    Good to hear you have it sorted.
    You can now still make use of the two pots in coarse and fine mode/configuration.
    I haven't used this capability much on the lathe but am using it on my coffee...
  26. Replies
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    Coffee machine is going well but here I'm...

    Coffee machine is going well but here I'm reporting on a coffee related experience that coffee nerds may be interested in.

    Today my uber coffee nerd mate arranged for us to get access to a...
  27. Replies
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    Does your VFD have multispeed capability, usually...

    Does your VFD have multispeed capability, usually any of DI1 thru DI6 or DI8 can be programmed to any specific frequency.

    On my dust collector I have mine set to use one of 3 speeds via a single...
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    Old Fuel in a MC tank

    My bro picket a 1980's BMW for $300.

    He reckons it had been sitting stationary for at least 10 years and the remaining fuel in the tanks smells like turps.
    It has also turned some of the rubber...
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    Thanks for the info. It looks like the van...

    Thanks for the info. It looks like the van insulation would be perfect for the sides but I am less concerned about the sides as I am about the top which unfortunately has a much smaller gap. Some of...
  30. Thread: Laser Welding

    by BobL
    Replies
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    223

    My BILs solar hot water system manufacturing...

    My BILs solar hot water system manufacturing business has been using laser welding for about a decade on stainless and copper to build the heat exchanger. One of the reasons they use it is that the...
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    Thanks.

    Thanks.
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    Thanks Ben, the space I need to fill/cover is 350...

    Thanks Ben, the space I need to fill/cover is 350 x 270 x 5 mm. How hard will it be to cut into 5mm thin strips?
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    I've been using it all day with the thin silicone...

    I've been using it all day with the thin silicone sheet.
    Best estimate is the silicone sheet increases the temp at the TC measuring point by about 0.7ļC and it appears to help stabilise temps...
  34. Thread: Old linisher

    by BobL
    Replies
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    370

    My experience with old motors is they are less...

    My experience with old motors is they are less likely to do well on a VFD so I doubt you will get the motor to do 150Hz, 100-120 is about the best you can expect.
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    Thanks, some good ideas there. I have just...

    Thanks, some good ideas there.

    I have just found one of SWMBO's silicone baking sheets - it's <1mm thick but it fits the inside top of the machine near perfectly so I can try it out as insulation...
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    Thank Michael. I got excited when I read this...

    Thank Michael.

    I got excited when I read this as somewhere I have a roll of EVA I purchased a few years back for some reason I cannot remember.
    Then I looked up the max temp EVA can handle and...
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    Thanks Michael. I've also seen that method in...

    Thanks Michael. I've also seen that method in use.
    However, now that over flushing has reared its head for the moment I'm not too concerned about the TC placement although I might come back to it...
  38. Thread: Old linisher

    by BobL
    Replies
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    370

    1430 RPM sounds like it was meant to be a...

    1430 RPM sounds like it was meant to be a woodworking sander.
    For metal working it really needs to be running at 2850 or more RPM.
    It can of course still be used at 1430 but it will wear belts...
  39. Replies
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    I probed the depth of the hole where the TC sits...

    I probed the depth of the hole where the TC sits with a piece fo wire and was able to determine the TC was about 10 mm back from junction "2" in the schematic above so then made a new TC that sits...
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    Now that the noise problem has been been reduced...

    Now that the noise problem has been been reduced to something manageable Ive been playing around with various temps and pressures.
    The setup is a magnet for testing and experimentation - I'll be...
  41. Thread: Braking resister

    by BobL
    Replies
    6
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    349

    I just checked my 2 braking resistors that look...

    I just checked my 2 braking resistors that look like the on in BJs photo

    One is for a 1.5kW Motor/VFD, it has a nominal resistance of 100Ω, while the other one is for a 2.2kW motor/vfd and that is...
  42. Thread: Braking resister

    by BobL
    Replies
    6
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    349

    Well, . . . . you can just use something like a...

    Well, . . . . you can just use something like a bank of of incandescent light globes or an electric heater element
    BUT
    Their resistance varies with temperature.
    For example, using the light...
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    Said cake tin turns out not to be quite large...

    Said cake tin turns out not to be quite large enough bit according to SWMBO her Mum's place (40km away) has a stash of square cake tins that are about to be thrown out.

    To test the effect of...
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    Funny you mention "tin boxes" I was just 5...

    Funny you mention "tin boxes" I was just 5 minutes ago eyeing one of SWMBO cake/biscuit tins :D
  45. Describing VFDs and their V connection...

    Describing VFDs and their V connection requirements is tricky and that site looks like it has made a bit of a dogs breakfast with it but there's nothing actually incorrect in what they said.
    They...
  46. Replies
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    Yes it is a bit of a dog's breakfast so it does...

    Yes it is a bit of a dog's breakfast so it does not surprise me there are probs.


    Yep, I am ware of this, same with the PS. However these should show up as problems even on the bench when not...
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    Set up the mains power supply to the VFD and...

    Set up the mains power supply to the VFD and Microcontroller (MC) so they are powered from the same outlet as the coffee machine
    Remember I want to turn on the VFD / MC and coffee machine from the...
  48. I have a small WW lathe that came stock with a SP...

    I have a small WW lathe that came stock with a SP 240V 1/2HP motor.
    I ran a 1HP 415V Y motor using a 240V VFD for about 3 years without any probs before I converted it to ∆.
    At 50Hz it had about...
  49. A 240V 3P Motor can run from a VFD in either ∆ or...

    A 240V 3P Motor can run from a VFD in either ∆ or Y mode, BUT it has to be set up for not just "∆ or Y but "240V ∆" or "240V Y".

    It just so happens that if a 440-415V Y is converted to ∆ becomes a...
  50. It's not possible to convert this motor, you'll...

    It's not possible to convert this motor, you'll have to replace the motor or get it rewound.

    Most of the conversions I have undertaken have been single to 3 phase so involve complete motor...
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