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Type: Posts; User: jhovel

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    Eagleeyes! Found it....

    Eagleeyes! Found it....
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    Will those wheels transmit 4000Nm in terms of...

    Will those wheels transmit 4000Nm in terms of traction? or will they just spin in the dirt? or will they spin the tyres on the rim and rip off the valves?
    I think you will need wheels of a small...
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    Some electric motors can come with a worm drive....

    Some electric motors can come with a worm drive. Simple, relatively cheap and you may be able to bolt the wheel(s) straight to the output shaft.
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    Spot on. Tell us more about about your...

    Spot on.
    Tell us more about about your project.E.g. why you are going that way, rather than VFD; how you are setting it up; what circuit diagram and how you plan to get the synthetic 3rd phase close...
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    A small car may have 300Nm at the wheel in top...

    A small car may have 300Nm at the wheel in top gear. at max torque revs, but I doubt it. It would be more like 3 or 4 times that! Still in top gear!

    In first gear, the assumption being that you...
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    ....radius is half diameter. 456mm diameter seems...

    ....radius is half diameter. 456mm diameter seems a big wheel for a trolley like this....?

    the force you measured is kgf (kg force) since it was measured at right angles to gravity. kg (or kp in...
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    Just came across this by accident:...

    Just came across this by accident: https://www.youtube.com/watch?v=2ylr1ggdZZo
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    Another option these days are hub motors. They...

    Another option these days are hub motors. They are a generation further advanced and there are no losses with chains, bearings, etc.
    Like this kind of thing:...
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    A couple of thoughts. Nm is a unit of torque or...

    A couple of thoughts.
    Nm is a unit of torque or "force"against a resistance. So we need to know the "resistance" first, to work out the "force" required to move it. So the weight of the boat an...
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    There are a few videos on YouTube. I guess you've...

    There are a few videos on YouTube. I guess you've seen those. I've never seen one used in person....
    Given that we are only a few hours from each other, maybe we should just have a play with them...
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    Might be worth your while to talk to Oerlikon...

    Might be worth your while to talk to Oerlikon directly () or Sulzer Metco ([url]http://www.sulzermetco.com/). Oerlikon have two distributors in Melbourne and one in Sydney. I had intended to contact...
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    I have no need myself, but there are always...

    I have no need myself, but there are always people asking for odd bits on the CX forum: https://australiancx.asn.au/forum/index.php?action=forum
  13. Spend some time and search this companies'...

    Spend some time and search this companies' catalogues - or call them: https://www.smallparts.com.au/store
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    I'd use a 3.15mm electrode and 100-120A but do...

    I'd use a 3.15mm electrode and 100-120A but do short welds all around. Steel to malleable iron welds OK. Grind the surfaces for the welds bright, so you get not surprises.
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    I'd be extremely surprised if they were imperial...

    I'd be extremely surprised if they were imperial threads. I have two 9500s from more than 20 years ago. All threads are metric.
    13.7 is probably right for a worn M14. But 11tpi is 2.3mm pitch which...
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    Graeme, do your grinders actually have M14...

    Graeme, do your grinders actually have M14 threads? Or are they M10? There are two versions of M10 threads on grinders: M10x1.25 and M10x1.5
    As far as I can tell, ALL M14 threaded grinders are M14x2...
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    It depends on if your printer is supported. Mine...

    It depends on if your printer is supported. Mine are not. That's why I forgot to mention that. Slic3r only works with one of my 3 printers too. So I have to use a different proprietary slicer for the...
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    Plastics have changed drastically over the past...

    Plastics have changed drastically over the past few decades, because manufacturing systems have become more sophisticated.
    The incorporation for example of glass and or carbon fibres makes those...
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    I was trained as a draftsman in the paper and pen...

    I was trained as a draftsman in the paper and pen era. When CAD became available for PCs (think IBM XT), I tried to learn the first time. I got lost and gave up. Over the past 30 years, I tried...
  20. VIC Consider this thread a record of a vintage...

    Consider this thread a record of a vintage machine tool.
    In the meantime it was sold.
  21. Just came across this thread after a long time. ...

    Just came across this thread after a long time.
    So just an update: we changed our mind about moving far away. We bought a 1/4acre block in Bendigo and are building a new house and shed.
    The...
  22. Thread: Cast repair

    by jhovel
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    Hi Stu. I strongly advise against trying cast...

    Hi Stu.
    I strongly advise against trying cast iron fusion welding in this case. The amount of heat you need is HUGE. The entire casting needs to be red - and kept that way, with the welding face(s)...
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    That Myford already has a reversing switch. So...

    That Myford already has a reversing switch. So please don't wind the carriage with the handwheel on the leadscrew while it is engaged for threading. Use the reversing switch instead!
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    [QUOTE=Turbine Builder;1996640]Got a couple of...

    [QUOTE=Turbine Builder;1996640]Got a couple of photos of this bike with a Tatra motor installed, from Czech Republic i think./QUOTE]
    Looks like a Ural frame and gearbox.... You could use a BMW twin...
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    Yes, the Biax uses 10mm centre mounting bolts. Of...

    Yes, the Biax uses 10mm centre mounting bolts. Of course that really is irrelevant for our adaptations - unless you intend to bolt it to a genuine Biax one day :)
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    You did a great job there! Love it.

    You did a great job there! Love it.
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    Anyone here have a CAD system that can do FEA...

    Anyone here have a CAD system that can do FEA (finite element analysis) - and is competent at using it? That's really what's needed here to answer the question.
    A quick CAD model of a 9m truss, 500...
  28. Thread: Fake relay's ?

    by jhovel
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    Weirdly, Jaycar don't seem to have them in their...

    Weirdly, Jaycar don't seem to have them in their catalogue....
    Here is a link to some in Port Macquarie: https://www.ebay.com.au/itm/363014562017 for $2.36 delivered..... or 5 for $5.40....
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    You could always bolt on an angle iron if your...

    You could always bolt on an angle iron if your don't trust your welding skills.... Although you welded the rest of the gantry. Seems to me this isn't anywhere near as critical as the gantry foot.......
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    With this setup you made, you can change medium...

    With this setup you made, you can change medium quite quickly and easily. That allows you to use crushed glass to cheaply and very aggressively remove rust and scale; fine garnet to clean metal...
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    or maybe like this: 398493

    or maybe like this:
    398493
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    All good. Nice mechanism! I can see it now too.

    All good. Nice mechanism! I can see it now too.
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    I use a small mag chuck on my vintage C.C....

    I use a small mag chuck on my vintage C.C. Engineering T&C grinder. Quite successful actually.
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    I'd love to see your work! The video is labeled...

    I'd love to see your work! The video is labeled "private" according to YouTube and I can't access it....
    Please make it public.
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    It is now sold for $600...

    It is now sold for $600...
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    My biggest surprise was not the cam gears, but...

    My biggest surprise was not the cam gears, but the the camSHAFT. The actual shaft and cam lobes were plastic.
    Thanks Shedhappens for the hint about checking air cleaner fitting condition in the...
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    A week or so ago, I had to rebuild our 12 months...

    A week or so ago, I had to rebuild our 12 months old lawnmower, that started burning a lot of oil.
    So I ordered some new rings and pulled the engine down. It is a 150cc "good old" Briggs & Stratton...
  38. VIC Charles Taylor Birmingham Vintage Tool & Cutter grinder for sale

    This is a project....
    I have searched everywhere for information on this machine. Charles Taylor had a machine and tool factory in the mid 1860s, died in 1895 and the factory was still going in his...
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    Makita uses a little thumb wheel in the trigger...

    Makita uses a little thumb wheel in the trigger on some of their tools to set the speed. I can see lots of those kind of trigger switches on AliExpress.
    I'll take the original switch out in the next...
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    I used a little rubber grease on the tight bits....

    I used a little rubber grease on the tight bits. But it fitted on with a little stretch.
    I think it would accommodate 1/4" as well.
    I discovered today that I haven't cut any holes for adjustment...
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    VIC Small (heavy) CVA 75 lathe for sale

    I'm reluctantly divesting my workshop of my smaller lathe....
    It is an old CVA75 rebuilt to a centre lathe by me in the early 70s, based on the construction of a Myford 10.
    See CVA Miniature...
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    If anyone is interested, I'll make same new...

    If anyone is interested, I'll make same new drawings of what the design should look like, given the 'mistakes' I made.
    The major issue - already addressed by Simon - is my choice of size for the...
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    You beat me to fixing it, Stu. I tried uploading...

    You beat me to fixing it, Stu. I tried uploading the photos with Tapatalk, but it made a mess and wouldn't let me fix it....
    I've edited the previous message on the laptop and put them in the right...
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    I finally compled the tasks given to me by "a...

    I finally compled the tasks given to me by "a higher authority" in my household...
    So I got back to the Makita scraper and pretty well finished it.
    A couple more adjustments to fiddle with and make...
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    This is really helpful information (for the...

    This is really helpful information (for the informed)! Thank you very much! I could well be a candidate down the road, and this kind of detailed info is really helpful to decide if it's worth the...
  46. Thread: Milling project

    by jhovel
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    If you only need one, I think you should have a...

    If you only need one, I think you should have a go on your new mill. Have you got a boring head and maybe a rotary table?
    It doesn't seem complex but will need some attention to set-up. Might be a...
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    Stu, could you just fit a suitably sized diode...

    Stu, could you just fit a suitably sized diode between the car and the van systems, so that current can only flow from the car battery to the van battery and achieve what you have in mind? I know...
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    Any offers over $500?

    Any offers over $500?
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    That depends entirely on your skills and...

    That depends entirely on your skills and ingenuity. That will b e true for every kind of ELS you get. Designing a way to mount the stepper or servo motors to the two axes, figuring out the motor...
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    This is the way to go on a budget: Electronic...

    This is the way to go on a budget: Electronic Lead Screw Main Page (I have one)
    This if budget is not so critical: https://www.rocketronics.de/en/els/
    Clough 42 ELS if you want to reinvent the...
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