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Type: Posts; User: RCaffin

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  1. Replies
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    Re: Newby questions

    Define 'detailed'.

    You can buy square end mills down to well under 1.0 mm diameter. You can buy ball end mills down near that too (or lower?). Not that below about 4 mm OD cutters start rising in...
  2. Re: Calling all Titanium grade 5 machinists in Australia and New Zealand

    Hi Peter

    Yeah, 1600-1650 is right. I thought my figure of 1900 was a bit high, but that is what the web site Material Science | News | Materials Engineering | News claims. I can only conclude they...
  3. Re: Calling all Titanium grade 5 machinists in Australia and New Zealand

    Hi Peter

    Sorry, but Ti 6Al4V has a melting point up around 1900 C, not 1200 C.
    EDIT Later: quoting from bad source: 1600 C is approx.

    I have been using a similar alloy in tube form for a...
  4. Re: Calling all Titanium grade 5 machinists in Australia and New Zealand

    On the subject of Titanium...…...for a DIY purpose...…..can it be melted in a furnace DIY style
    In principle, yes, but it would have to be a very special furnace! The melting point is very high,...
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    Re: spiral circular coding

    @Dave

    Yes, this does require that the controller be able to handle g2/g3 commands, and yes, I know some older controllers can not.

    All 3 programs work, and create a spiral cut. The point of my...
  6. Re: Need an idea of the cost to get this little engine cnc

    What do you guys think I would expect to pay to send the plan to someone for me to do the machining,
    I do not understand this. Why would you send the plans to someone else if you want to do the...
  7. Re: Calling all Titanium grade 5 machinists in Australia and New Zealand

    I machine a lot of Titanium, including both CP and 6Al4V.

    But I must point out that there are already suppliers around, both in America and China, who can supply useful offcuts and 'bits' at a...
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    Re: spiral circular coding

    I suggest your problem is that you are working in IJ mode. I use R mode and have no trouble at all. Um - I also use subroutine calls, which makes it even easier, and parameters - can Fanuc handle...
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    Re: 1st Build, will this be a decent Design?

    Hi Phil

    Put that diode bridge on a heatsink, PLEASE!
    At 10 A and 1.8 V across the bridge, it will be dissipating 18 W.

    Cheers
    Roger
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    Re: Timing Belt Opinions

    Can't see them handling an aggressive cutting load though.
    Chuckle. Check out the specs. I machine steel and titanium with my machine.

    Cheers
    Roger
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    Re: Timing Belt Opinions

    I would not pick a 'different' belt - I would stay with the GT2, but I would buy a wider belt if needed.
    It's just that the 6 mm size is very cheap from China - that's all.

    Cheers
    Roger
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    Re: Timing Belt Opinions

    Those GT2 elts are much stronger than you might think.
    I have seen 3 or 4 V-belts in parallel, on proper pulleys. It should, in theory, work here too. Need to handle the tracking problem.

    Cheers...
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    Re: Timing Belt Opinions

    6 mm GT2: used on little 3D printers, so hordes of Chinese suppliers.
    Wider than that: European or USA suppliers only. A bit more $ of course.

    429152
    Z axis. 9 mm GT2 belts bought in, Gates...
  14. Re: Holding brake needed on a 4/5th axis when using a harmonic drive?

    1 mm is thick.
    The point of the epoxy is to 'fill in any gaps' and prevent flexing. Start with a good flat surface before you add the rails. Then an epoxy thickness of 0.1 - 0.2 mm is enough.
    ...
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    Re: Timing Belt Opinions

    I use GT2 belts myself between motor and ball screw, motor and harmonic drive.

    The 6 mm ones are usually quite enough for that: they have incredible strength which few seem to understand - and...
  16. Re: Epoxy-Granite machine bases (was Polymer concrete frame?)

    Very neat looking.
    But no tailstock? I find the lack of one to be a small problem at times.

    Cheers
    Roger
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    Re: Chinese Ebay 4th axis Harmonic Drive

    Interesting. Criticism of 'Asian rubbish' is easy to make, but I have found that a lot of (ebay) vendors are actually quite concerned about keeping their customers happy. There have been a couple of...
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    Re: Which bits to use for PCB milling?

    If you are gong to use end mills of 0.5 mm diameter, you have better not have a TIR of 0.2 mm!
    Good solid mills are to be praised.

    Cheers
    Roger
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    Re: Size for ground wires

    I have a single solid brass bolt on the main control chassis. This is directly connected to the Mains Earth wire. ALL my power supplies (the negatives) are connected to this bolt as well. I am not...
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    Re: Size for ground wires

    Not mentioned yet is the function of a Ground wire - why have one? There are two reasons, and really two different sorts of ground wires.

    The first is safety. If something exciting goes wrong, you...
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    Re: Epoxy Granite Portal Machine

    I agree with all of Britt's comments, including that calibration equipment has to be 10x better than your routine gear.

    Cheers
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    Re: Epoxy Granite Portal Machine

    Dear me, so negative. So utterly . . .
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    .
    .
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    realistic.

    Cheers
  23. Replies
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    Re: Epoxy Granite Portal Machine

    0.001" tolerance with a 2kW ROUTER?
    With cheap little router bearings?
    An interesting concept.

    Cheers
    Roger
  24. Re: Looking at a new CNC for home (might build might buy, not sure yet)

    the wow factor to me was not the cutting ability, but the how rigid must the column holding the spindle .
    There is a known difference between routers built with plywood and serious milling machines....
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    Re: 1st Build, will this be a decent Design?

    I think I started with a Tek 556 with 1A1 plug-ins, but the nuvistors died, so I graduated to a Tek 475. I gave that one to a friend when it developed a problem - he had the bits to repair it, and...
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