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improving Aloris copy parting tool holder?

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  • improving Aloris copy parting tool holder?

    I use an Aloris copy Chinese QCTP and have been very happy with it with one exception. The parting tool holder is ground vertical, however I use tapered parting tools. The result it the parting tool next to the holder is vertical, while the other side is at the full taper angle (around 4 degrees).

    To alleviate that I was going to pop the holder on the grinder at 2 degrees and grind the holder to suit the parting blades (they seem to be tapered around 2 degrees either side), however before doing so I thought I'd ask around as to how other members have got around this situation?

    Pete

  • #2
    I've never tried tapered blades - mine are all "T" shaped, but I had the same problem with the slot, so I just milled a groove to allow clearance for the top of the "T":



    My modified one on the left, Aloris on right:



    The full write-up: http://www.frets.com/HomeShopTech/To...offholder.html
    Last edited by Frank Ford; 04-23-2011, 03:43 AM.
    Cheers,

    Frank Ford
    HomeShopTech

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    • #3
      Thanks Frank. I was wondering if someone had done something with the blade eg shimmed it or similar. However it looks like we both had the same idea, just a different approach to suit the different blades, so I think I'll also modify the holder. It's not like these holders are irreplaceable heirlooms

      Pete

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      • #4
        Forrest I changed the angle to approximately 2 degrees


        I promised my wife I wouldn't work so late into the evenings as I'm quite busy at work and pretty shagged, so won't have a chance to try it until tomorrow. I think the taper on these blades is a bit over 2 degrees either side, but it's a little difficult to measure so I just settled on 2 for now and will see how it parts now.

        Sorry the images are pretty crappy, I just use my phone and the iPhone 3 isn't the ideal for this type of thing. I should have ground out that big China branding while I was at it!!

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        • #5
          I stuck a really small drill bit between the blade and the holder to kick out the bottom enough to make the tool vertical. It was a temporary fix that I intended to address, but never have.

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          • #6
            Pete, you can easily work out the exact angle by measuring at the thickest point at the top of the blade, the thinnest at the bottom and the height then apply a little trig. This is a much more reliable way to measure angles than using a protractor or other angle measuring device except maybe a Sine Bar.

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            • #7
              just did that

              Pete,
              funny you should ask- i actually did exactly what you were thinking just yesterday- modified a cheap AXA Aloris copy to take the 5/8" tapered blades from my lantern holder. i have a number of really good cobalt blades and needed a way to use them. the mod works fantastic, it was a little tricky to get the angles just right and it took me way too long but the results are well worth it- on my 10K i can part at turning speed with very little heat build-up because of the side clearance of those blades. you will like it a lot.
              Last edited by 1200rpm; 04-23-2011, 01:06 PM.

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              • #8
                Nice modification! I should do something similar, though it means making the whole holder as I have none at the moment

                Originally posted by PeteF
                I promised my wife I wouldn't work so late into the evenings as I'm quite busy at work and pretty shagged, so won't have a chance to try it until tomorrow.
                If you are shagged at work, I must ask what you do for living? Say hi to your wife from here
                Amount of experience is in direct proportion to the value of broken equipment.

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                • #9
                  Like Ron above, I made a temporary fix 4 or 5 yrs. ago and am still using it.

                  I had several of the tapered blades so I just mounted 2 of them back-to-back with one of them upside-down.
                  Milton

                  "Accuracy is the sum total of your compensating mistakes."

                  "The thing I hate about an argument is that it always interrupts a discussion." G. K. Chesterton

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                  • #10
                    Yes the mod worked very well, and easily parted some 25 mm steel rod with nice straight parting. It didn't take long to setup so I would definitely recommend it to others

                    Jaakko, like you, my wife is Finnish ... So I do as I'm told

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                    • #11
                      Originally posted by PeteF
                      Jaakko, like you, my wife is Finnish ... So I do as I'm told
                      Yeah, you can get far just with sisu
                      Amount of experience is in direct proportion to the value of broken equipment.

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