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  1. #211
    JOGARA's Avatar
    Lives in Derby, United Kingdom. Last Activity: 15 Hours Ago Has been a member for 0-1 years. Has a total post count of 159. Received thanks 5 times, giving thanks to others 39 times.
    No idea what is going on with my Z today. And in general the machine is acting up after working fine for a hour or two.

    Just set my Z on my part, ran the program that worked before (doing the same op on the same part to test repeatability) and it just plunged 20mm down into it.
    It now thinks the machine cords for Z are 20mm lower than they were just set using 2ref all home".

  2. #212
    JOGARA's Avatar
    Lives in Derby, United Kingdom. Last Activity: 15 Hours Ago Has been a member for 0-1 years. Has a total post count of 159. Received thanks 5 times, giving thanks to others 39 times.
    So I have spent all weekend and this week so far on this problem to no avail.
    Had one guy on Fusion forum take a look but he could only simulate it so did not see the problem.

    I just noticed on the operation I am running now it looked like it dropped a step.
    Wondering if I am taking to much of a DOC or pushing too hard on the feed and it is pulling the bit?
    Over time it would result it multiple height differences which I am sort of seeing but some heights are correct.

    Once this operation is done ill touch off from the top of my stock and see where it thinks it is.

  3. #213
    JOGARA's Avatar
    Lives in Derby, United Kingdom. Last Activity: 15 Hours Ago Has been a member for 0-1 years. Has a total post count of 159. Received thanks 5 times, giving thanks to others 39 times.
    I have just touched off my part and it is saying it is +1.3mm.
    Visually it looks like the bit is further down than it should be so I think it confirms that it is slipping.

    I am using the correct collette size and it is tight when I insert the bit.
    Not stupid tiht but it grabs onto the bit.
    I am not over cranking the thread when putting it onto my spindle as I don't want to over do it. But it is still quite tight.

    What is my best option here?

  4. What type of spindle/collet?

    If it's ER, then it sounds like you're not tightening it enough. ER collets have to be tight or bits will pull out. There are torque settings for standard ER collet nuts, but typically it's as tight as you can get it with your hands and standard sized spanners, however that's assuming things are well anchored. On a freely spinning spindle, gauging tightness can be a bit tricky.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  5. #215
    It's possible to buy replacement ball-bearing collet closer nuts for ER spindles. Arc Euro stock them, as an example. I use these on a couple of different ER collet spindles in my workshop, including the ER20 spindle on my CNC router, and they make tightening the collet much easier.

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