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  1. Replies
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    Re: Milli a new composite mill kit

    Will be another 1800 posts. :P
  2. Re: Another DIY CNC Machine Project… - Looking for some advice

    It's always a risk not to have hard limits.
    The arguments against them is that its easier. Very little else of benefit.

    The important thing here is there is no accepted right answer. Do what you...
  3. Re: Another DIY CNC Machine Project… - Looking for some advice

    Soft limits are software, they have no relation to any physical switches. In a hypothetical machine with no switches whatsoever, you can still home manually and set limits in the software and in all...
  4. Re: Another DIY CNC Machine Project… - Looking for some advice

    He is suggesting the second scenario discussed earlier. NO hard limit switches, and only a home switch, allowing the software to handle safety. I personally wouldn't do it this way on a fast servo...
  5. Re: Another DIY CNC Machine Project… - Looking for some advice

    Ah yes, missed that line. Most of these controls will do some sort of independent homing to square up. moves home, hits the first switch, homes to that one "synchronized", and then rehomes the other...
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    Re: Jerk Control in machines

    Wasn't meant to be a knock, just a description of why it's in the "hobby" level despite the software being quite evolved. (although in fairness the mesa 7i96 is $119 but needs a PC of course)...
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    Re: Jerk Control in machines

    Tiny G is (was) low performance due to the hardware, but the software itself is really interesting.
  8. Re: Another DIY CNC Machine Project… - Looking for some advice

    I think that interpretation is wrong.

    We are talking about separate switches for home and limit. You can still have one limit switch that activates at both ends of the travel (one limit and one...
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    Re: Jerk Control in machines

    That fanuc article is from 2012 and still considered valid methodology although the exact feature naming has changed. It is still a trajectory planning algorithm and has nothing to do with the...
  10. Re: Another DIY CNC Machine Project… - Looking for some advice

    Yeah I mean if its wired to e stop. (hit the switch, stop the machine).

    I guess it makes some sense, you either have 2 separate switches, or, you forgo a hard stop switch which is actually what...
  11. Re: Another DIY CNC Machine Project… - Looking for some advice

    240, 220, 208, close enough. :P

    I assume most new gear just "handles it" but the brother isolation transformer from uh.. 1990? had at least 8 incremental taps for anything from 200 to 250v. Pretty...
  12. Re: Another DIY CNC Machine Project… - Looking for some advice

    But does that same switch being connected to E stop cause an issue? (same switch for hard limit and home)
  13. Re: Another DIY CNC Machine Project… - Looking for some advice

    Quickly:

    - The filter is going to have a basic spec, should be standard from many sources. It is optional and really depends on your mains power/shop space. If its flakey or your shop has tons of...
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    Re: Jerk Control in machines

    Cam calculates nothing in terms of velocity, acceleration or jerk that is relevant to the control. It certainly can *predict* what the control might do if you feed it parameters (simulate the...
  15. Re: Another DIY CNC Machine Project… - Looking for some advice

    You still have the issue of hitting the hard limit which should be tied to e stop. I agree though you need to first see how uccnc handles it.
  16. Re: Another DIY CNC Machine Project… - Looking for some advice

    $45 is alright. My 240v delta was $87cdn when i got it a few years ago. Now it is.. *checks digikey* $135 and has been out of stock every time I've looked for over a year. Almost no delta psu's are...
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    Re: Jerk Control in machines

    Here is a bit of fanuc's feature manual. I suppose mactec will say they have no experience either... (there is a reason most of the forum has him on ignore for the last 10 years, just sayin)

    --- ...
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    Re: Jerk Control in machines

    I'm specifically meaning a situation where the control is sending out pulses and each drive is doing its own thing.



    That's why use used G1 in my example although linuxcnc has fully coordinated...
  19. Re: Another DIY CNC Machine Project… - Looking for some advice

    24V psu in your case can be 60W, 120w. it doesn't need much. It's running IO and the Z brake release and little else. If you had an ATC with solenoids and coolant valves etc, you might need to...
  20. Re: Another DIY CNC Machine Project… - Looking for some advice

    On the home... there's again 500 ways to do this. In the most basic form, you need a switch to trigger a home sequence, and a switch to trigger hard limits. Home allows the machine to register...
  21. Re: Another DIY CNC Machine Project… - Looking for some advice

    The delta manual should show wiring configs. Also check the delta NC300 manual (their control) for more practical diagrams. One contactor / breaker in front of all drive power stages that is enabled...
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    Re: Jerk Control in machines

    I've been saying that since the other thread... he's almost as bad as you :P

    In coordinated motion on CNC it can't be controlled by the drive, otherwise you no longer have coordinated motion. Many...
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    Re: Jerk Control in machines

    It is not implemented in CAM, it is implemented in the machine control. CAM has absolutely zero to do with trajectory planning.

    Good CAM can make the control's job easier but all aspects of motion...
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    Re: Jerk Control in machines

    Capacitors are used across dc lines to filter voltage ripple and make a more clean dc voltage. This is all done behind the rectifier inside the drive. Some DC drives may ask for external caps, but...
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    Re: Jerk Control in machines

    So you don't know the price is what you are saying?
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    Re: Jerk Control in machines

    By control the industry means controlling it. There are 2 ways to read it i suppose, both ultimately meaning the same thing. One is that Jerk is controlling acceleration. The other is the control is...
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    Re: Jerk Control in machines

    I never saw that with Haas in Canada going back to about 2003. What I do find is you gotta pay cash though. This is a bank think though will all machine brands. They wont least to anyone but an...
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    Re: Jerk Control in machines

    What are the listed prices of the cam software it is integrated in? I can't find a single listed price.

    Given the benchmark for pricing right now for fully integrated 3 axis CAD/CAM is "free" for...
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    Re: Jerk Control in machines

    This is something I rage at in this industry. I literally go to CMTS and ask company X "how much does this cost" and then can't tell me. If you can't tell me the price of the thing you are selling, I...
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    Re: Jerk Control in machines

    Here is a brief description of siemens jerk control on all of their controls. They call it jerk limiting. Same thing, it is controlling jerk. It is enabled with the "soft" command, and disabled with...
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