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Type: Posts; User: RCaffin

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  1. Replies
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    Re: 3D Probe - Tri-balls type accuracy & DIY

    To attach the balls, apply the solder past to the pads on the PCB, place the parts, then preheat the balls to just above the reflow temperature of the solder paste. Place the balls on the pads. They...
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    Re: Can I change X,Y,Z zero mid program?

    Mactec is right. Doing a cut&paste without checking the guts of the file is going to fail 99.99% of the time.

    How many CAM programs can handle anything beyond G0-G3 and simple drilling? Rather few...
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    Re: 3D Probe - Tri-balls type accuracy & DIY

    Um ... having been down that path several times - just how do you intend to attach the balls to the PCB holes? You will need to use very hard balls: brass need not apply imho.

    Cheers
    Roger
  4. Re: RFQ - CNC Lathe parts - Aluminium - Metric - RADAR feed Horns

    When you talk about a diamond tool bit, just what do you mean? We may be talking about different things.

    You see, to me a diamond tool bit is a shaft or a disk encrusted with very small diamonds...
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    Re: 3D Probe - Tri-balls type accuracy & DIY

    Renishaw use strain gauges these days, which explains both their sensitivity and their price.

    I did look at the idea (and I do have the strain gauges and the necessary electronics workshop), but...
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    Re: MYOG and Repair Touch Probe Styli

    Start with CZ balls for practice. Ruby balls (undrilled) are still expensive.

    Cheers
    Roger
  7. Re: RFQ - CNC Lathe parts - Aluminium - Metric - RADAR feed Horns

    I see. That high in frequency. OK.
    All the same, I think you need some different specs than what you have given. A surface waviness of 5 um is within your specs, but I suspect it might not suit the...
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    Re: Can I change X,Y,Z zero mid program?

    Be warned: there is a slight problem in Mach3 with G54.
    When you load a program which is written using several instances of G54, the on-screen display of the cutter path at Load Time is correct,...
  9. Re: RFQ - CNC Lathe parts - Aluminium - Metric - RADAR feed Horns

    Material = Aluminium 6082 T6 AL6082
    Not a problem.

    Interior surface roughness Ra = 0.02um or better.
    Tolerance = 0.01mm

    Um - the tolerance of 10 microns is doable, but the surface finish spec...
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    Re: Can I change X,Y,Z zero mid program?

    You do not mention what size CNC you have, nor what controller you have (eg Mach3). This info is usually needed.

    I have machined up to 20 units at a time, in a 3x6 or 2x10 grid, using the G54/etc...
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    Re: 3D Probe - Tri-balls type accuracy & DIY

    My CNC has a basic single-step resolution of 0.98 microns.
    With a Z-axis probe I can see that in a profile of ground stock.
    With a 3D probe the resolution is a bit larger - maybe a few microns.
    I...
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    Re: Help! PVC Letters Curve not right

    The first thing to do is to check the drawing as most fonts use sort straight lines,
    Very good point! Especially if the original outlines were for a smaller size.

    The thing to do would be to try...
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    Re: threading in mill profile

    I do threading on the lathe under Mach3Turn, and I use a single point thread milling cutter on Mach3Mill. Both work fine. I would not try mixing them, like trying to use G32 in Mill. I doubt the code...
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    Re: Help! PVC Letters Curve not right

    We KNOW that Mach3 can do that, so I suspect your problem is backlash in the Y axis.

    Cheers
    Roger
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    Re: Need some advice hit a dead end

    I switched to an ESS with the latest driver, and have never looked back.

    Cheers
    Roger
  16. Re: "RUN FROM HERE" Z- Axis goes to Limit switch???????

    It has never worked for me. I don't try it now.

    Cheers
    Roger
  17. Re: Spindle rotates only clockwise (M3 works, but M4 does not work)

    Faulty contactor for M4. Check output with a voltmeter.

    Cheers
    Roger
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    Re: HMC Program Trouble with G03

    Switch to radius mode: it solves a lot of problems.

    Cheers
    Roger
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    Re: Any pics of cnc control cabinets?

    A lot of good advice there.
    More room, more room!
    Document! Label!

    Cheers
    Roger
  20. Replies
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    Re: Any pics of cnc control cabinets?

    What Jim said: it is a matter of experience and judgement, not of 'rules' (apart from things like the UL guidelines, which are mainly for safety rather than 'good practice').

    Contactors are...
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    Re: Bent X ball screw?

    Fair enough. I have done that too: strip a ball nut down, clean out the gunge, and rebuild it. Very educational exercise. Best done over a large tub or basin, so no balls get lost!

    Cheers
    Roger
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    Re: Bent X ball screw?

    That is quite a long thin ball screw. If the axis is moving fast, you may be getting some whip in the shaft - ie it could be vibrating.
    The serious cure for this is a ball screw with a bigger...
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    Re: Dunedin NZ smal job needed

    A solide tube????
    32 mm down to 21 mm is a huge reduction, and a massive waste of aluminium too. I can't imagine a tube with such a wall thickness.
    You don't mention length either.

    Cheers
    Roger
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    Re: Backlash free rotary table

    URL for the PDF?

    Cheers
    Roger
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    Re: Vetric Aspire nose dive on Z Axis

    A silly solution that works is not so silly.
    Yeah, a medium-speed reliable machine is much better than a fast but unreliable machine. Educational for all.

    Cheers
    Roger
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