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Type: Posts; User: grg12

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  1. Replies
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    Re: Stepper Motor Demagnetization

    Magnets dont like heat - neodymium magnets can permanently loose part "power" if exposed to temperatures over 80 Celsius.
    See:...
  2. Re: 2FL 1/8 End Mill Biting into 6061 and Corkscrewing

    What collet type are you using? If its ER - are you sure its istalled correctly? ("click in" empty collet in nut then slide endmill in).
    Maybe it's obvious but some people don't get it first time...
  3. Re: Looking for some advice v carving letters in 3mm aluminium

    When i cut soft aluminium (hardware store grade) i always spray it with ethanol spirytus (cheap stuff sold as paint thinner or grill lighter fluid). It helps a lot - even if applied from hand...
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    Re: Mini lathe motor whining noise

    I was standing with oscilloscope probes in hand over controllers board - connected to mains and some lightbulbs (dummy load). I wanted to see what's going on... then I remembered that this "light...
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    Re: Mini lathe motor whining noise

    Do not connect random condensators parallel to motor. It may destroy switching elements on controller board.
    PWM controller used in this type of application switches output between full supply...
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    Re: Mini lathe motor whining noise

    Check if chips on controller board have readable numbers (on my board all chips had identifiers ground off). If yes - try to Google them, they probably used standard pwm controller - there is chance...
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    Re: wire requirements

    Thiner wire means higher resistance - if the wire is too thin (or too long) driver won't get enough current for steppers.
    To get some "feeling" about appropriate wire gauge lookup this table:...
  8. Re: Question about using PWM with "standard" stepper drivers

    Hallo

    You wrote that "low current" mode can be activated by dip switch - i guess a small relay can do it too? Of course it will require opening the drive and "hacking" it a bit with additional...
  9. Re: 500 watt DC spindle creates interference on arduino

    I don't have this type of spindle - i don't know what supply voltage it uses or how to calculate correct condensator value. If there is no recommended condensator type for this spindle - i would just...
  10. Re: 500 watt DC spindle creates interference on arduino

    First photo suggest that power cables of spindle are far away from any other cables - thats good. What i don't like - spindle uses single lead cables and they are far from each other creating large...
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    Re: Clear Acrylic is not Acrylic

    Clear "hobbyglass" is polystyrene - cheap but quite unpleasant to work with - tends to melt and stick to tools. No idea what laser will do to it.
  12. Re: Capacitor calculation for toroidal transformer and rectifier bridge

    He used transformer power rating to roughly estimate maximum amperage - worst case scenario. Number you get from this equation is higher (larger "sag") than i Praxis since equation assumes capacitors...
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    Re: DIY CNC Mach3 aligned squares

    I guess x axis is not perpendicular to y axis. Probably you need to adjust x axis motors independently till all corners are square
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    Re: Cleaning Linear Glass Scales

    Glass is quite impervious but what about markings? One scale that i disassembled had some sort of metalic way markers - looked like vapour deposited and etched. It didn't looke like gold - no idea...
  15. Re: Broken bit from bad connection of alligator clip!..ugh

    I guess they actually break electrical contact when touched.
  16. Replies
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    Re: Sherline edge finders and wobblers

    Cheapest option - piece of drill rod with small ballbearing pressed (or glued) at end :) I have miniature edge finder from proxxon (with 6mm shaft) but in most cases i don't bother with using it...
  17. Re: Getting confused about the maximum step frequency that is needed for my machine

    Yes - but even with max value pulses were too short for my hardware - eventually i scrapped the board and build new one with faster optocouplers. "Slow" board used cheap LTV827 optocouplers, "fast"...
  18. Re: Getting confused about the maximum step frequency that is needed for my machine

    I must admit i didn't measure linuxcnc - just mach.
    Generating spikes is easier that square wave - all you need to create spike is to set and immediately clear port. For square wave you need to...
  19. Re: Getting confused about the maximum step frequency that is needed for my machine

    I don't know how today's software behaves but 10years ago mach and linuxcnc outputed series of short spikes - not a 50% square. I designed and built breakout board with optoisolation only to...
  20. Re: Bought a laptop to run cnc , now hear it’s a bad choice :(

    Laptops are bad choice for systems controlled through parallel port where computer must maintain precise timing for step generation. Most laptops have built in power consumption reducing devices that...
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    Re: HELP - Blowing Fuses & melting Switches

    Hmmm as far i know 250v/10A fuses should reliably blow at 10amps /120v (or even 12v ). 250V ratings means that you can use them on 250V mains - they should not "hold" arc after blowing. Automotive...
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    Re: Have issue with cnc 3020 :(

    I switched to linuxcnc - but, honestly, i just started to collect hardware for grbl. I don't have any more spare old computers with lpt port left...
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    Re: Question about 7° radial groove.

    Sorry - i somehow misinterpreted the drawing. Thought its a long thin spindle not a ID of sleeve. In that case it should be tan(90-7)/(pi×diameter )
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    Re: Question about 7° radial groove.

    Tangent of groove angle is equal to part circumference divided by one thread length. Therefore threads per inch will be tangent (7)/(pi×diameter) . But i don't guarantee it's correct. My reasoning -...
  25. Thread: Micro slot

    by grg12
    Replies
    3
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    477

    Re: Micro slot

    Slitting saw?
  26. Replies
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    Re: General purpose mallet recommendations

    About lead hammers - i heard juwleliers don't use them beacuse they leave residue - if contaminated gold is heated (soldered) residue creates hard to remove stains.
  27. Re: What happend to the world - why can't people call something what it is??? (Rant)

    Word "Sketch" is often used to describe programs written for arduino controller. I assumed they choose this name because "sketch" sound less intimidating than "source code" :)



    My private...
  28. Re: What happend to the world - why can't people call something what it is??? (Rant)

    Coder is not the same as programmer. Just as machine operator is not the same as machinist.
    And "sketches" are less scary for kids☺
  29. Re: How control stepper's current without chopper IC?

    Ok, that explains a lot



    I looked dataschet of this chip - i think you can use it to drive unipolar motor. But it won't be easy
  30. Re: How control stepper's current without chopper IC?

    Attached schematic schows basic idea how chopper circuit work - not a practical device. The only reason to build it will be school exercise - and even then it will require many additional components....
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