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  1. Ozwes007

    Needle bearings in a model diesel ?

    Have a look at outboard engine, some of those use split roller bearings.
  2. Ozwes007

    Precision?

    Precision is relative. Simple but true statement. I’ve worked in many fields, from level 1 Machinist, CNC machinist, project management, maintenance management, leading hand, etc in machining , welding, fabrication, sheet metal. The one leading cause of failures, bar nothing, has always been...
  3. Ozwes007

    Are lathe tool carbide inserts supposed to be sharp?

    In essence carbide doesn’t lend itself to particularly sharp edges, however with todays coatings and superfine structure they do make “sharps”. They are a honed edge tool designed for aluminium or plastic. I have used them for over 10 years now and they are as good as any other for there...
  4. Ozwes007

    Homemade sandblasters .

    https://www.machineryhouse.com.au/Sandblaster?From=Search&s=Blasting i have used a couple of these. They work reasonably well. Might give you some ideas on making one. Australia.
  5. Ozwes007

    Homemade sandblasters .

    Just a heads up, you should never use sand for sandblasting. It will give you silicosis. banned in most countries and places of work.
  6. Ozwes007

    CAD /Autocad Help

    I’m not following you believe that a cad drawing and a paper draft drawing could be different if drawn to ISO specs. The dimensioning tolerances are expressed in the iso specifications on the drawing notation block. Unless other countries don’t use specifications on cad drawings, which by the...
  7. Ozwes007

    CAD /Autocad Help

    An unfortunate side effect of the newer 3D cad programs is the need for vastly expensive computers to run them on. An example is a basic AutoCad system these days requires a water cooled video card with memory and computing power that is top of the range. Even small to medium Engineering...
  8. Ozwes007

    CAD /Autocad Help

    2D drawing is additive, you add bits till you have a complete shape. 3D is the opposite, you start with a block(whatever shape) and you remove pieces, you mould pieces, you extrude pieces to get the complete shape. That is how I sell it to apprentice’s
  9. Ozwes007

    Poor mans slotting head

    Rotary broaching is a nice technic. Made one to put a dodecahedron hole through some gears for a gearbox I made years ago. Tooling can be costly to make though, depends on what you are cutting.
  10. Ozwes007

    CAD /Autocad Help

    I use LibreCad for 2D work and Openscad for 3D. I have designed complete roll cases with saws etc for Businesses I have worked for. From within OpenScad I have generated work drawings as DXF files that I bring into LibreCad to produce Production drawings for manufacture. total cost of Software...
  11. Ozwes007

    Poor mans slotting head

    Blind hole keyways are usually terminated with a hole slightly over the key size. This maintains the structural integrity of the unit being keyed. Undercutting can lead to failure at the undercut.
  12. Ozwes007

    Cam/valve timing...

    Here’s a good place to make a degree wheel to suit your cam. https://www.blocklayer.com/degree-wheel.aspx
  13. Ozwes007

    Cam/valve timing...

    Try this video to assist. A lot of people find the terminology the hardest to understand. TDC = Top Dead Centre(piston is at the top of its stroke), BTDC = Before Top Dead Centre, ATDC = After Top Dead Centre, BDC = Bottom Dead Centre (Piston is at the bottom of its stroke), BBDC = Before Bottom...
  14. Ozwes007

    Cam/valve timing...

    Cam timing works within the Otto 4 cycle - generally it goes something like this intake opens a small amount before Top dead centre (BTDC) ( the exhaust is open here on the close side of its cycle)on the overlap stroke, the piston goes down sucking in the fuel air mixture a little after Bottom...
  15. Ozwes007

    How to limit swarf into the chuck ?

    Disregard Mousetrap mate. Stupid is as stupid does. You have quite a legitimate question and many legitimate answers.
  16. Ozwes007

    How to limit swarf into the chuck ?

    All chucks from time to time need a clean to get rid of small amounts of swarf. If it is getting in quickly then I would look at the clearance on the chuck key gears. Most times it will get through from the scroll contact area of the jaws. This is however usually of very small amounts over...
  17. Ozwes007

    A rocket maker

    Hope to be down in Tassie next year, maybe I’ll see some skyrockets in flight😂😂😂😂
  18. Ozwes007

    Flywheel becoming loose (setscrew is used)

    A piece of round silver steel is a good key. Drill into the shaft and tap the silver steel into it. I would do it between the 2 groves you have put in the shaft. Put a couple of o rings in the groves. On the pulley simply grab a square file or a small warding file on its edge and file the...
  19. Ozwes007

    A rocket maker

    Found a few. I think these may help anyone that is interested In pulsejets. I believe these are free of copyright.
  20. Ozwes007

    A rocket maker

    I will see if I can dig them up. Be a few days as I’m on a course atm
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