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Type: Posts; User: Muzzer

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  1. Re: Convert manual Bernardo KF 20 L Super milling ma to CNC, but keep manual mode opt

    It looks like a fairly common Chinese machine with a "Bernardo" badge on it. I don't have one myself so don't know the model names but if you Google you should find a lot of conversions for this same...
  2. Re: Yaskawa servo motor "retrofit" (Hurco BMC-30)

    If it's got Yaskawa servo motors, doesn't it also have Yaskawa servo drives? If so, I can't imagine why you'd remove them and fit something in their place. Yaskawa is about as good as you'll get when...
  3. Thread: Software

    by Muzzer
    Replies
    17
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    90

    Re: Software

    Designspark is basically a cut down version of Spaceclaim, IIRC. It seems there used to be a SC forum on this site but it doesn't seem to have flourished....
  4. Re: Fusion 360/Mach 3 Gcode program end code help

    If you feel up to it, you can always have a go at modifying your post process to change the code at the start and finish of the file to whatever you like. It's written in Javascript, if you have any...
  5. Thread: CNC Tube Bender

    by Muzzer
    Replies
    24
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    458

    Re: CNC Tube Bender

    You should make sure that you are sitting down when you receive the quote for a harmonic drive of the correct size. However, you can buy pre-owned examples from ebay dealers in South Korea and China....
  6. Re: Lost position with closed loop stepper motors! Nightmare! Please help!

    Ah - there had to be an obvious explanation! However, the max axis speed and the pulse frequency are two different parameters. If you had the pulse frequency set to 400kHz, the pulse width would be...
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    Re: Tension Compression tapping help

    I've been using a TC head on my machine to do tapping and the reason I see to include a delay at the hole bottom is to allow the VFD to stop and change direction without tripping - and avoid the...
  8. Re: Lost position with closed loop stepper motors! Nightmare! Please help!

    Seems unlikely the stepper system misbehaved. More likely it didn't see the correct number of step pulses. Reducing the max frequency and increasing the pulse width would seem like possible...
  9. Replies
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    Re: how to use vfd for old cnc mill

    The suppressor is there to protect against the arcing you get when you open the contactor when the motor is running. It will reduce RF interference with electronics etc and reduce pitting on the...
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    Re: Strangely losing Steps in X axis. Help pls!

    That chart's an excellent illustration of the futility of gearing a stepper motor down to "get more torque". In doing so, you often end up with almost the same final torque due to the way torque...
  11. Replies
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    Re: WillMill - HSM Benchtop Composite Mill

    Wow. Where are you getting these numbers from (polite answers only please)? I'm trying to think of cutters of this size that could take cutting forces equivalent to the weight of one seriously fat...
  12. Re: Scam or real? Please let me know what you think

    Streetview shows a tiny little industrial unit. Can't be bigger than a few heads at most - if that really is their address. The building is blank, no name on the door....
  13. Re: Tree Journeyman 325 - SD1525-10 Drive (Z-Axis) Getting OT/RMS Light

    I have used 3 of the CNCdrive brushed DC drives on my 1983 Shizuoka. They are a well priced product although clearly not in the Yaskawa quality zone.
    These are 160Vdc and 45A, which is good for...
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    Re: CNC Mill Spindle Positioning for ATC

    Must admit, I can't easily find anything that relates pullstud force to max torque although the static coefficient of friction between flat surfaces seems to be around 0.35-0.4. Relating that to a...
  15. Replies
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    Re: CNC Mill Spindle Positioning for ATC

    If you have a decent power drawbar, you won't need to be driving the toolholder by means of the drive dogs. Do what Fadal did on my Shizioka machine and simply remove the dogs. Job done, no need for...
  16. Re: Tree Journeyman 325 - SD1525-10 Drive (Z-Axis) Getting OT/RMS Light

    Looking at the date codes on those electronic components (1989-1991), this is an old system, nearly 30 years old. You should be prepared for failure of any part of the controller at any time and be...
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    Re: DYN2 drive issues

    It's the rapid decel that is causing the damage. If the recovered power is greater than the losses in the system and the servo driver, the difference will end up being dumped in those capacitors ie...
  18. Replies
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    Re: Bridgeport quill ball screw conversion

    Yes, mine still has a 3 axis DRO from before the conversion, too. The Z axis one fits in front of this assembly but I need to get the limit and home switches etc set up before I put that back on and...
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    Re: Bridgeport quill ball screw conversion

    Here's a quick vid. You can see the concept at least. With a 4mm pitch ballscrew and 1.8:1 reduction, a 2Nm closed loop stepper can manage a pretty decent downforce and a reasonable rapid.

    The...
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    Re: Bridgeport quill ball screw conversion

    I originally made a yoke with a pinch bolt that allowed me to release the quill for manual operation. However, once the CNC system is up and running, I find there's no need for manual operation...
  21. Re: How good is purenature turmeric curcumin?

    That's right. And I'm Mary Poppins.
  22. Re: Closed loop stepper motor control using arduino

    Be aware that an encoder will only give you incremental position ie how far the motor has turned. So what you will get will be a pair of quadrature (A and B) signals that you will have to use to...
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    Re: inserts to machine harden material

    I've machined HRC60 steel using std inserts on several occasions - such as ballnuts, toolholders and pullstuds. The inserts may not last as long as normal but the cost doesn't end up being silly....
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    Re: BRIDGEPORT VMC- BOSCH DRIVES-SEM MOTORS

    Is it possible the new motor has a different encoder resolution? You should ideally find the datasheets for both motors and compare them. Or post them here so somebody can help you.

    You will see...
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    Re: List of free cam software

    In fact, for hobby users, it's fully enabled. The only "missing"(?) features are some of the optional CAM "extensions" which require credits - but few hobby users would ever be in a position to use.
  26. Thread: Tree JM 425

    by Muzzer
    Replies
    3
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    216

    Re: Tree JM 425

    Presumably the encoders you refer to are the encoders in the servo motors. If so, they are reporting the positions of the motors, not the table. However, the controller DRO display and the actual...
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    Re: The Haas desktop mill.

    IIRC, the expected price tag for this is about $9k. That's a lot of money just for a controller.

    This is primarily a learning tool for those who want to program Haas machines offline, with a toy...
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    Re: Ideal wiring situation

    Sorry, I casually interchanged 110V and 120V in my haste - as you say, it should be a nominal 120V, +/-5%. The explanation about 120-0-120 is valid though, so if you want 120V and 240V you only...
  29. Re: Power Supply Delta Electronics ESR-48/40A Voltage and Current Adjustments

    These rectifiers from the likes of Delta, Huawei etc are designed to work in a system built up of building blocks according to the end application, which will typically be telecomms, base station,...
  30. Re: need help with a centroid conversion on a haas

    Try posting your question on the Centroid forum. Lots of knowledge there.

    https://centroidcncforum.com/viewforum.php?f=20&sid=a9867fea254e91477fc3bec8cb25059a
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