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  1. #1
    Join Date
    Jan 2014
    Location
    Northern Beaches, NSW
    Posts
    287

    Default What tooling to turn Cast Iron?

    All,
    Just started to try and face my 4 jaw backing plate before fitting the 4 jaw, only to find that it seems much harder than the HSS Im trying to face it with.

    Within 10mm or so of starting to face its dulling / grinding the HSS to the same shape of the faceplate, i.e. flat!

    Is this a job for Carbide or am I doing something fundamentally wrong?

    Pointers and advice please!



    Thx
    J

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  3. #2
    Join Date
    Jan 2014
    Location
    Northern Beaches, NSW
    Posts
    287

    Default

    Think I've solved my own problem...

    SPEED. I had too much I it.

    Engaged the back gears, re-ground the tools and all seems much better now!


    Thx
    Jon

  4. #3
    Join Date
    Jun 2007
    Location
    sydney
    Age
    64
    Posts
    3,566

    Default

    Do yourself a favor and search for HSS cutting tool angles (this will give you a base line to work to when sharpening,it should also include the theoretical angles required for different materials).

    Also do a search for cutting speeds of different materials when using HSS (it may only show carbide,if so only use around 1/4 of what is said),there should also be a formula for working it (rpm ) for the diameter of the material.

    Normally when I face cast I run 2 to 3 times quicker than when I am turning.

  5. #4
    Join Date
    Jan 2014
    Location
    Northern Beaches, NSW
    Posts
    287

    Default

    Ok, update from my experience today...

    Slow is good!

    I guess it was my inexperience showing early on this morning. I forgot to look at my speed tables and was initially running WAY to fast. A quick reference to what the turning speed should have been for my diameters put me in the 40 - 150 rpm area. I don't have a tacho on the lathe so I put a paint mark on the 4 jaw backing plate and did my best to count the revolutions for 5s, multiplied it by 4 and estimated that I was now running about 80rpm.

    I took light cuts and felt how it went. I soon got that I could see and hear where it wanted to be - a bit quicker near the centre and slower as I got to the outside - VFD was great for this!

    I didn't know about turning vs facing speed- good tip. Thanks.

    Jon

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