Recent content by Dubi

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  1. Dubi

    Cast an inline 4 engine block with plaster mold

    Very impressive, well done.
  2. Dubi

    53kg steel bar to be machined for a hoist center pin

    I thought members might like to see my attempts to machine a 53kg bar of 400 series steel for a center pin for a hoist. The hoist will be used to lift diving equipment and other trial underwater equipment to a Dive Tank platform. The Dive Tank is 4.5 m high by 3.5 m diameter. Returning to the...
  3. Dubi

    Deburr aluminium thin sheet

    I have used Noga tools for more than 45years and have found to be first rate products. In fact I have two deburring tools which I bought in Israel in 1984 and they work just as well when I first bought them. I also bought lathe threading tools which still work perfectly. I machine anything...
  4. Dubi

    Complete Model Engineering Shop

    I am so sorry to learn of your medical condition. I wish you every best wish for your health and hope you will still post your words of wisdom for us all to learn from.
  5. Dubi

    Up in pun intended.

    Every best wish for a safe operation and speedy recovery.
  6. Dubi

    Up in pun intended.

    Very interesting post. That is a new one to me. The question is, why would somebody be grinding aluminium on a wheel? The only fire which I know about and was non work related was in the UK some 50 years ago. Where somebody used a 9 volt battery in contact with wire wool. That set off a nice...
  7. Dubi

    Centring in a 4-Jaw Chuck

    In my shop if you leave a key in the chuck you are fired. Very simple and plain to understand.
  8. Dubi

    Hello from Southwest OHIO

    Fantastic work, my full praise.
  9. Dubi

    Soft copper tubing?

    Something new to me. Used sand to bend aluminium tubing but never salt. Being finer it should result in much more even forms. Thank you.
  10. Dubi

    Refractory cement

    Hi Willy, we are going for a 1:3 mix but that could change once we see the perlite size. We will do a few tests before the final mixture.
  11. Dubi

    Problems with face cutting on lathe, wavy pattern

    Not sure if this will help or hinder. I was machining some Delrin plates and had a similar pattern to yours. I had been machining manually but changed to auto on the slowest feed I could and reduced the speed to about 350 rpm. They came out perfect.
  12. Dubi

    Refractory cement

    Thank you very much. I will go for the Fire Clay and Perlite.
  13. Dubi

    Refractory cement

    From most articles and posts I have read the usual material is Fire Cement and Perlite but I have also seen reference to a Plaster and Sand mix. My construction will uses 44 gal drum so the requirement quantity is quite large. Where I am located cement is about 1$ a Kg and Perlite is about...
  14. Dubi

    Snow Engine

    The only word I can think of to describe this beautiful weapon is "Outstanding" and I am jealous.
  15. Dubi

    Bouncing mills and other scary stuff....

    I recall some years ago melting aluminium in a ceramic flask. I started to smell burning rubber and looked down to see I was standing in a molten flow of aluminium. Never moved so fast in my life. Will never use ceramic flasks anymore only cast iron.