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Type: Posts; User: reg.miller

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  1. Replies
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    Re: Choice of spindle for drilling on CNC.

    Thanks. So what do I need to look for in terms of spec. What kind of motor construction and motor driver ? I could lash up a hand drill as Peter suggested but they usually have ridiculous amounts...
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    Choice of spindle for drilling on CNC.

    Hi,

    I have a CNC milling machine with a three-phase chinese 2kW / 24000rpm spindle controlled by a VFD.

    It is fine for milling wood/ali/steel .

    I don't do much work on steel because the...
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    Re: controlling feedrate in tight corners.

    Thanks, that makes sense. Forcing a stop is a crude way of reducing the cutting speed for that part of the path, meaning smaller chips and in general a finer finish. So long as that does not harden...
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    Re: controlling feedrate in tight corners.

    thanks. So that looks like surface feet per minute and thou per tooth.

    For top flight software I'd have thought a speed would be marked in coherent, physically meaningful units, not "per minute"...
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    Re: controlling feedrate in tight corners.

    Thanks for adressing to the question. :)

    What is PM,PT ?
    Does "const removal rate" option provide for a near constant tool tip cutting speed between straight lines and corners?
  6. Replies
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    Re: controlling feedrate in tight corners.

    Why would I want to stop the job and how would that prevent the tool cutting speed from being several times the feedrate in arcs?
  7. Replies
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    Re: controlling feedrate in tight corners.

    I was sure it was done a looong time ago by loooooots of people. That is why I was asking what methods were used. That was the start of this discussion.

    I have now modified FreeCAD to...
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    Re: controlling feedrate in tight corners.

    Yes, for simple forms, I find I often hand code rather than waste time configuring CAD. I get cleaner faster code with less unnecessary retractions.
  9. Replies
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    Re: controlling feedrate in tight corners.

    What I'm saying is that there is no shock because of a tangential arc. There may be a shock coincident with a tangential arc for another reason.

    So your solution is to hand code the change , not...
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    Re: controlling feedrate in tight corners.

    engagement angle is important but it is not another name for cutting speed. On the first cut in a slot the engagement angle is 180 even on the straight section. That is not what is determining the...
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    Re: controlling feedrate in tight corners.

    There is no shock transitioning from a straight to a tangential arc. The principal question I'm trying to find out about is how this massive increase in cutting speed over feedrate is handled.

    If...
  12. Replies
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    Re: controlling feedrate in tight corners.

    I'm aware my software is not handling this well. That is why I am trying to find out how this is usually handled in a more professional context. FreeCAD is FOSS, and this seems like something which...
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    Re: controlling feedrate in tight corners.

    So without knowing spindle speed or the number of flutes , you think you are qualified to tell me it is "rubbing".

    Wrong.

    180mm/min with full tool width and 2mm depth was throwing decent size...
  14. Replies
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    Re: controlling feedrate in tight corners.

    Thanks Peter.

    A change of 300% in cutting speed is obviously not good. It either means the straight sections are 3x too slow or arcs way too fast.

    I got caught out by this when I set feedrate...
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    controlling feedrate in tight corners.

    Hi,

    I was wondering how to better control feedrates on G2/G3 arcs when tool radius is more than half the arc radius.

    For example. I have a 12mm slot with semi-cylindrical ends. I want to cut...
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    Re: G83 retract remains in hole ?

    Thanks I'll test it when I get a chance.

    Why would the machine not do what I told it? Are there "smart" Gcode interpreters which think they know better and refuse to follow gocde instructions ?
  17. Replies
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    Re: G83 retract remains in hole ?

    I want to keep clearance height, so I'd avoid a G0 between drillings and use G98. That makes an extra move but it's a rapid , so doesn't cost much.

    G0 Z5 (CLEAR CLAMPS)
    S2000M3
    G98
    G81 Z-0.875...
  18. Replies
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    Re: G83 retract remains in hole ?

    Thanks GG. Your second suggestion just occurred to me after posting. That fits the bill.

    I was wondering whether it was possible to give R below but that will crash at G0. Two ops is the way...
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    G83 retract remains in hole ?

    Hi,

    I have a deep hole which needs pecking to remove chips/swarf. I would like to keep the tip of the drill just inside the hole to prevent degrading the opening by multiple re-entries of...
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    Re: Huanyang Chinese VFD settings and manual here!

    Mine has a jumper you need to move if using Vin as the speed control.
  21. Replies
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    Re: Huanyang Chinese VFD settings and manual here!

    Hi,

    when I looked at the CSMIO IP-S manual I did not see a specification of 24V , this seemed to indicated in wiring diagrams , often in brackets. From the chip datasheet we see this is NOT a...
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    Re: Huanyang Chinese VFD settings and manual here!

    Where is this 24V coming from ? I'm not sure the digital inputs will like 24V.

    CSMIO IP-S show 24V as an example that does not mean it requires 24V. It says output driver is VNQ860


    ...
  23. Re: Spindle grounding- manufacturer says to not ground

    If you want to call someone pathetic, it's best to learn how to spell if first , mr. perthitic. :wedge:


    Wrong. A small voltage can lead to a high current across a near zero resistance. This DOES...
  24. Re: Spindle grounding- manufacturer says to not ground

    Don't let preschoolers or vulnerable people like Joe Biden use your CNC. You should be good at 30mA ;)

    I don't know if the "damage" comment is supposed to refer to shorting the induced spindle...
  25. Re: VFD Configuration With Huanyang VFD [ Model: HY02D223B ], C10, C6, Mach3

    I have a pretty similar combination. Running on domestic single phase 220V supply.



    Where does that 6000 rpm come from, experience or spec ? I got a fairly complete manual with the VFD but...
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    Re: Nema 23 motor comparison

    Yes lots of good kit in US is pretty inaccessible, even most firms won't ship outside US/Canada. Maybe this will change with whatever trade deals are put together but I think it's mainly about...
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    Re: Nema 23 motor comparison

    First of all NEMA17 and NEMA23 are standards for the physical mounting dimensions they are NOT a stepper motor. Your statement about specific motor type and geometry are NOT part of the standard and...
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    Re: chinese 2kW spindle motor repair

    Hi, it's very similar to the one shown in this thread:
    https://www.cnczone.com/forums/spindles-vfd/129454-water-cooled-chinese-spindle-disassembly-2.html#post1093542

    In the top centre photo, it's...
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    Re: chinese 2kW spindle motor repair

    Don't worry, I did not drill the moving parts. Just the static ring which is screwed over the bearing block.

    It does now run with out tripping out but I have yet to seal it up and refill the...
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    Re: chinese 2kW spindle motor repair

    Many thanks, it's invaluable having someone who knows what these things are like inside.

    I had to drill a small hole in the guard ring to get clear access to allen screws behind it and have been...
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