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  1. vk7krj

    What Determines the rpm of a engine?

    Forgive me for the aside Gentlemen- Kf2qd, you were almost right- in the mid-60's Honda raced 50cc twin cylinder, 125cc 5 cylinder, 250cc 6 cylinder and 350cc (actually 297cc- a stretched 250) 6 cylinder engines. Exquisite pieces of machinery, revving to around 20 to 22,000 rpm and with a sound...
  2. vk7krj

    1/4 scale Anzani Fan Engine

    Excellent results Creast- what software are you using to create your stl files?
  3. vk7krj

    Monotube Flash Boiler Design

    Steamchick- many years ago when I worked in Whyalla in South Australia, I had a car with a small (273 cu in) v8 in it. I fitted an accessory water gauge and was always intrigued to see the water temperature come DOWN to running temp. after the car had spent the day out in the sun. It was...
  4. vk7krj

    New "Project Log" forum WHY?

    My own take on this sort of fragmentation- I think it is pretty ordinary at best. To see what happens when a forum goes down this path, take a look at the prusa 3d printer forum- they currently have 535 different sub-forums and seem quite happy to make even more. And as for not allowing...
  5. vk7krj

    Unusual twin cylinder engine design

    "I wonder if that is a part of their decision to frequently ride at speeds slower than most on Motorways? At least in my view" Steamchick- we used to say the reason for their slow speeds was they didn't have to walk back as far to pick the bits up that fell off.............
  6. vk7krj

    rotary table programming

    When I wrote my (arduino) code for my dividing head some years ago- and after numerous computer crashes, I now no longer have the source code!-I calculated each step from scratch, as I figured that way I won't accumulate any error. Seems to work, I don't have any measurable accumulated error...
  7. vk7krj

    Modified Milwaukee portable bandsaw and stand

    And Steamchick, you have given me an idea- I wonder if a jigsaw modified to hold a small file ,and upsidedown in a simple stand, could be pressed into service as a poor mans filing machine?
  8. vk7krj

    Modified Milwaukee portable bandsaw and stand

    I bought my bandsaw about 15 or 17 years ago, it continues to be my most used tool. Not long after I got it it went from cutting perfectly straight to cutting more and more on a slope.. I worked out that the teeth on one side were slowly loosing their set. The teeth were running on the drive...
  9. vk7krj

    4 Cylinder Inline Engine

    Ray, take a look at Graphogen- https://www.graphogen.co.uk/index.asp?pageid=644920 We used to use it a lot when assembling our old british bike engines in much younger days. Coat the bearings and bores with it before assembly and the loctite won't be a problem. But don't do what a friend did, he...
  10. vk7krj

    Converting Imperial and Metric threads to U.S. Threads

    Tug40 said "And BSA stood for Bastard Stopped Again." Thanks Tug40, that made me laugh- I hadn't heard that one before. Though back in the 60's it could have applied to most of the pommie bikes we owned- even the new ones!
  11. vk7krj

    Converting Imperial and Metric threads to U.S. Threads

    As they say- the trouble with standards is there are so many of them! If I remember correctly, the BSA Bantam (early pommie two-stroke motorcycle) had some 37 different threads on it, including several that were BSA's own design- made maintenance a nightmare. We always used to say BSA stood for...
  12. vk7krj

    First and Third Projection Symbols

    That jogged the memory a little- had a rummage in the cupboard- and sure enough, my HP35 and HP11C are still there. The 11C still turns on (batteries must be close to 30 years old now....) but no battery pack or psu for the '35 any more. So I had a bit of a play with the 11c- just enough to...
  13. vk7krj

    Prusa XL 3D Printer

    I'm pleased to report my XL has finally arrived! And it certainly hasn't disappointed me. I changed my order to the 5 head model, which delayed it somewhat, but it is now up & running in it's home-made enclosure. My first print (other than the test print) was a box for the tools that came with...
  14. vk7krj

    Another Aussie

    Bluejets, would you mind giving some references to the relevant australian legislation you spoke about?
  15. vk7krj

    My shop

    If you can make those rule stick then I am very envious of you GreenTwin. Almost all the workshops I grew up in and around seemed to follow the rule "don't put it away, put it on the floor/bench/machine tool/anywhere but away" and after 75 years it's kinda hard to break the habit. I am trying...
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