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  1. M

    SIEG help please

    The attached shows a screwed collar at the base of the quill. This has become loose and I am at a loss to understand its purpose. I have no diagram showing the spindle/quill or the collar. Any advice would be appreciated Many thanks Mike
  2. M

    Compressed air safety

    I have been following the posts on silver soldering boilers and the safety issues. I would welcome advice regarding compressed air tanks. I have a steel tank (Draper twin cylinder compressor) with a 50Ltr capacity tank and a working pressure of 120psi. Water collects in the tank although this...
  3. M

    Mitutoyo 1-2inch digital mic failure

    My 1-2inch mic model number 293-345 has suddenly stopped working giving a blank display. I replaced the battery with a known good cell but no luck. I removed the front cover and verified that the battery contacts were in good condition and making contact. There was no sign of coolant in the...
  4. M

    Filling a blow hole in aluminium casting - Help!

    I have some blow holes and a depression in a web on the Kiwi crankcase casting. Normally I would fill this with xxepoxy based compound and when painted it wouldn't be noticed. For this model I would like to have a sand (glass) blasted surface which looks really good but-but-but I have these...
  5. M

    Case Hardening Help!

    I have a need to case harden the rocker arms of the Kiwi and I am seeking advice on the "best" process. I have a good supply of propane but I do not have a furnace - just fire bricks. The parts are about 35mm x 7mm x 7mm and machined from bright "mild steel" bar. I don't have the steel ident...
  6. M

    Post Titles - Keywords

    Guys May I make a plea that new posts have a searchable title. The recent post entitled "Hello" was interesting but meaningless when looking at the post listings. Please guys use a title which relates to the content. Thanks Mike
  7. M

    SIEG KX1 Mach3 advice needed please

    I have a SIEG KX1 CNC mill running MACH3 R3.041. MACH3 has been configured for the KX1 and I don’t know what that means. MACH3 runs on a very old Dell under XP Pro. The interface to the KX1 is via a parallel port. I was advised at purchase by ArcEuro that MACH3 should be run under XP with...
  8. M

    Machining Valve Stems

    Please may I tap into the vast knowledge base of the HMEM members? I need to machine the valves of the Kiwi and I can’t formulate a procedure which will give me a 1.5inch long x 0.125dia valve stem which is a good sliding fit into a reamed hole. I’m using silver steel (drill steel). I could...
  9. M

    Kiwi piston dimensions

    Guys. I have completed the machining of the piston for the Kiwi MK2 from solid. All is well and I have left the length as 1 1/8inch which is longer than needed. My question is "how far from the top of the cylinder should the top of the piston be". This obviously affects the compression and...
  10. M

    Myford oiler - advice needed

    I am now on my 3rd Myford having started with a ML7 then 2 x Super 7Bs. Great machines but all with the same problem:- the oiler. OK its not really a lathe problem, more an accessory problem. I have tried various oilers and they all leak. My current nipple oiler is a Wanner from Switzerland...
  11. M

    Myford S7 Half Nut

    After 40 years of owning several Myfords I have just managed to jam the cross slide (via the lead screw cover) against the gearbox. Fortunately I keep the V belt a little loose and the result was that the lathe stopped but the motor didn't stall. I can't see any obvious damage and the gears...
  12. M

    Lapping cylinders - compounds

    I am about to lap a cast iron cylinder using an expanding lap as per shown in Blondihacks video and in one of Joe Pieczynski videos. This type of floating lap seems to make sense but I am confused re the compound. I only want to use one compound otherwise I will need to make more than one...
  13. M

    Cast Iron Stress relief?

    I am about to machine the cylinder liner for the KIWI. The bar of cast iron seems to be good quality with no hard skin. I have rough cut the liner to 0.9inch bore and 1.3 od needing to finish up at 1inch bore and 1.125 od (with a lip). The bore depth is 2 1/4inch with a 3/4 inch of solid for...
  14. M

    Cutting fluids

    For the past 40 years I have only used oil cutting fluid - Neatcut. My reasoning is that it doesn't encourage rust, doesn't stain when left for several weeks, doesn't smell, doesn't encourage bacterial growth and acts as a (limited) machine lubricator . Many years ago I operated machines using...
  15. M

    Crankshaft steel specification

    I will soon need to machine a single throw (9/16") crank about 5" long for the Kiwi. I would really welcome suggestions re the steel spec which I would need to purchase in the UK. Ideally it should be easy to machine, give a good surface finish and not warp due to stresses. Thanks in advance. Mike
  16. M

    CAD /Autocad Help

    I have just received an email to inform me that my version of Autocad LT 2012 will no longer be supported from July 2022. They usefully will let me continue to use the package but if I need to reload, Autocad, will not validate the licence so it will not load. The question is - what should I...
  17. M

    Kiwi Crankcase – a different approach

    I am always hesitant when suggesting that there is a different way to machine a well-established casting. I am sure someone will point me to a post made years ago which describes the same process! That said, the method of holding the rear crankcase casting described by ETW and more recently in...
  18. M

    G-Code error HELP!

    Guys I have coded a name plate for my Wyvern using DXF (for outline) to CAMBAM (for text) and G-Code from CamBam with 99,000 lines into MACH3 and a KX1 mill. Machining with a 0.3 V cutter. Dedicated computer running XP with no AV or any attachments (as per MACH3 instructions), 2Gb of ram. I...
  19. M

    G-Code record

    Guys I have just generated G-Code using CAMBAM and there are 75,000 lines. Is this a record? I have to say I was shocked. I am now sitting down with a glass of wine deciding the best way to modify the tool path. The main issue is the 0.3mm cutter and area clearance. I have to stay with the...
  20. M

    4 Stroke engine video and plans

    The builder of this interesting 4 stroke engine has posted a series of quality videos - the last of which I reference below. Does anyone know if there are any plans/drawings for this engine? I don't know the identity of the builder and the questions asked on the YouTube channel seem to go...
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