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Type: Posts; User: Robin Hewitt

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  1. Replies
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    I have paid for but not taken the 2013 upgrade...

    I have paid for but not taken the 2013 upgrade yet.

    I didn't see any remarkable improvement to fill me with the pioneering spirit.

    Is it safe? :confused:
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    I have one but I don't have another laser to...

    I have one but I don't have another laser to compare it with. Have some random information, I'll try and give you a feel for it.

    The Moshi software comes with a dongle. You can cut text in...
  3. Not neccesarily so on the K40 :D The water...

    Not neccesarily so on the K40 :D

    The water pipe inlet and outlet in the case hold the pipes down near the table top. So long as you have more than 33mm of water in the tank the air cannot pass.
  4. I never knew such things existed by Jingo. ...

    I never knew such things existed by Jingo.

    That makes no-flow no-laser totally simple :D
  5. I did the same to get the bubbles out of the...

    I did the same to get the bubbles out of the tube. It is so compact I simply tilted the whole danged thing so the water was flowing uphill and watched the bubbles rush to the outlet.

    If the...
  6. Hi Jack I have the same machine and just...

    Hi Jack

    I have the same machine and just destroyed a tube when I forgot to turn the pump on. I'm going to add a cup to catch the return water, a cup with a hole in the bottom. If the cup fills,...
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    No point asking for advice if you don't take it....

    No point asking for advice if you don't take it. 4mm wall silicone tubing is hard to find in short lengths, I did try. I can do it with two lengths of 2mm wall one inside the other.

    One of my...
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    I really should stop searching the web :eek: ...

    I really should stop searching the web :eek:

    Some of these RTV silicones have a dielectric strength as low as 500 V/mm

    Silicone tubing is good at around 7 kV/mm.

    OTOH, a few layers of shrink...
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    New tube and PSU arrived today, looks unbroken. ...

    New tube and PSU arrived today, looks unbroken.

    Don't think I want to solder wires to the tube, I'm thinking adhesive lined heat shrink to hold them in place followed by self fusing silicone tape?...
  10. Replies
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    Hi Walt Coolant in hot end first, keep as...

    Hi Walt

    Coolant in hot end first, keep as close to room temperature as possble :cheers:

    A 120mm radiator and fan is enough? I don't have air conditioning, hot weather is rarely a problem here....
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    This sounds like quality information. I will...

    This sounds like quality information. I will plumb it in and see what kind of duty cycle I can get without straying above 40C :D

    Susu, thank you for your kind offer, my tube and PSU have already...
  12. Replies
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    I can see you do not understand how this works. ...

    I can see you do not understand how this works.

    Your solution is to buy a CW3000 water chiller.

    My solution is to understand the problem and then fix it.

    You think your solution is better.
    ...
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    I measured the flow rate from the pump at 18...

    I measured the flow rate from the pump at 18 cc/second. The water should come out 3degC hotter than it went in. Sounds fine and dandy.

    Then I looked up the thermal transfer coefficient of glass...
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    Hi Dave I usually avoid doing sums on American...

    Hi Dave

    I usually avoid doing sums on American sites. They usually go by the, "if more is good then too much is about right" philosophy. Strangely enough it seems to work, I drive the stepper...
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    The tube and PSU are going in the bin :D I...

    The tube and PSU are going in the bin :D

    I have now gone paranoid about tube temperature, totally anal.

    Question: I plan to add a thermal laser shut off switch shortly after the tube outlet. I...
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    Well, it seems Walt was 100% correct. When my...

    Well, it seems Walt was 100% correct. When my laser isn't arcing fit to burst it can barely cut through a piece of masking tape. I think the mirror has leaked air just like he said.

    It's also...
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    Hi Walt I'm now waiting for the glue to...

    Hi Walt

    I'm now waiting for the glue to solidify. I managed to fix it in place without disturbing the 90 degree mirror or removing the tube, using a humble wooden ruler and a couple of elastic...
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    Hi Walt You are probably right, but I have...

    Hi Walt

    You are probably right, but I have little to lose by trying :D

    The mirror seal appears okay. It had overnight to leak and degrade but fired up strongly this morning so I may get away...
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    Laser tube repair?

    Oops!

    I forgot to turn on the water, the ring on the exit mirror detatched and I get a few seconds from cold before the mirror overheats and the beam starts to wander :rolleyes:

    40W 70cm tubes...
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    Perhaps you need to PM Fishface (message #7) who...

    Perhaps you need to PM Fishface (message #7) who has a spare chip.

    If it was me I'd try changing the 32MHz crystal, always a good bet with a dead CPU.

    Is MoshiDraw 2013 an improvement? I...
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    That's what I thought. Replacing the processor...

    That's what I thought.

    Replacing the processor is easy, the Atmel part will just slot in.

    Driving the steppers is easy, switching the laser is easy, reading the limits is easy, BUT talking to a...
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    Hi Fred You posted while I was replying to...

    Hi Fred

    You posted while I was replying to myself. Nothing like posting while buzzing out a circuit, takes time but gives you an incentive to get it right or look like a twit :)

    I am a control...
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    I am going off this Moshi board... I was...

    I am going off this Moshi board...

    I was wondering what the big 150R resistor was for and I think it's the 5V supply and component D12 is a 5.1V Zenner. Weird, why would anyone do that when a 7805...
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    Chinese 40W Moshi/8051

    Hi

    I've just got one of these cutters and want to dump the Moshi software.

    The controller board is the MS10105 V4.1

    They have cleaned the name off the processor, but...

    Active high RESET...
  25. Those painted slats look wonderful, we will need...

    Those painted slats look wonderful, we will need after-cut pictures to see if it is worth the effort :cheers:
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    Probably full of typo's... unsigned...

    Probably full of typo's...



    unsigned values[8];
    boolean firstRun=true;
    unsigned j, tally;
    int led12 = 8;
    int led13 = 9;
  27. Replies
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    I thought that was clear, I'll drop back a few...

    I thought that was clear, I'll drop back a few levels, apologies if I drop too many :cheers:

    If you have an "8 bit" computer chip the largest number it can handle without effort is 256.

    If you...
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    Which part? :confused: I think your only worry...

    Which part? :confused:

    I think your only worry is arc strike pulses which the filter should remove before they reach the ADC. OTOH it is perfectly possible that the cutter is already removing...
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    The code is taking a rolling average, hence...

    The code is taking a rolling average, hence firstRun to fill the 8 number array.

    The *50); implies the plasm cutter is dividing the voltage by 50 before it gets to your voltage divider, hopefully...
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    Nothing wrong with 1600 rpm, I rarely go that...

    Nothing wrong with 1600 rpm, I rarely go that fast, don't let folk cutting metal with routers confuse you, you are milling. There is a limit to how many horse powers the tool can carry to it's tip so...
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