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Type: Posts; User: 109jb

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  1. Re: Tie 220v VFD into dryer line - with a switch?

    Not sure where you are located, but you need to check code requirements. What you propose would not fly where I live. It would be considered a code violation regardless of whether it would work...
  2. Re: Need help in DIY configuration/design of Proximity Switches 5 Axis Rotary Axis

    If the travel is from -180 to +180, why not just put one homing switch at -180?? There is nothing to say that a homing switch has to be a "0"
  3. Re: Differences between HTD, GT, AT and T pulleys?

    Simple:

    https://assets.gates.com/content/dam/gates/home/resources/resource-library/catalogs/powergripdrivedesignmanual_17195_2014.pdf
  4. Re: Tie 220v VFD into dryer line - with a switch?

    Seems dumb to me to not run a new circuit if the service panel is directly above where the router is going. You'll spend more money on a "transfer switch" than you would just buying a CB and running...
  5. Re: R8 Adapter for AXA toolpost. Has anyone tried this?

    I guess I don't see why the 3/4 boring bar holder isn't good enough. They are cheap too.

    If you really want a collet holding it then why not an off the shelf MT3 AXA holder and a MT3 3/4" collet....
  6. Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    This is because my ballnut setup uses springs to force the ballnuts apart resulting in absolutely no backlash. The spring force is about 100-150 pounds driving them apart. On most double nut setups...
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    Re: Buying first metal lathe

    The difference between the PM and the G0752 are:

    PM - DC motor
    PM - Direct mount chuck

    G0752 - VFD controlled 3 phase motor
    G0752 - Threaded mount chuck

    To me the VFD controlled motor is a...
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    Re: Help understanding stepper motor behavior

    The quantization error is quite simply the difference between the idealized programmed position and reality. Nothing more. Nothing less. Every microsteps has an ideal position. For example on a 1.8...
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    Re: Help understanding stepper motor behavior

    Not sure I fully understand your question, but this article qives a really good explanation of microstepping:

    https://www.zaber.com/technical-articles/microstepping-tutorial
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    Re: Help understanding stepper motor behavior

    This is wrong. He has 16x microstepping which is 3200 microsteps per revolution. so, 16*200/14 = 3200/14mm = 228.5714. Exactly what he said he has it set for. I have never seen a stepper driver with...
  11. Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    That link is for calculating the force produced by an ACME screw. The OP has ballscrews which are much more efficient. Here is a calculator for ballscrews. For efficiency, a ballscrew is about 90%...
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    Re: Help understanding stepper motor behavior

    Rather than get regurgitated information, just go to one of the most repsected sources when it comes to steppers

    https://www.geckodrive.com/support/step-motor-basics/accuracy-and-resolution.html
    ...
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    Re: CNC Mini series for beginners and Hobbyists

    I have a ***ty internet connection every time I open my computer. A cellular LTE connection is faster and more reliable than what I have. I actually just got a LTE Hotspot because it is better and I...
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    Re: Persuade me not to go DMM servo

    He's talking about machine accuracy not servo/stepper accuracy. They are two different things.

    OP. If I am reading right you are looking for 900 IPM on 10mm pitch screws with rotating nuts spun...
  15. Re: Can you take step / direction from G540 to run old analog servo motor?

    The DB9 is from the driver to the motor and will not have step and direction in those wires. It will have coil A and coil B wires for the stepper.

    The G540 consists of a mother board and 4 G250x...
  16. Re: Is there any actual upside to gear-free DC spindle motors?

    I don't see anywhere on either the AT or LMS sites where they show any torque curves or make any claims about constant torque. Where do you see this documented?

    Also, nobody said anything about...
  17. Re: Is there any actual upside to gear-free DC spindle motors?

    Are you specifically referring to the brushless DC motors like the one you linked? I mostly see those type brushless motors on machines that either previously came with brushed variable speed DC...
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    Re: Stripped the column cap head screws on g0704

    When you drill the head of a bolt off you gradually reduce the cross section that is still holding the tension. As you get closer and close to breaking through the tension will release gradually and...
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    Re: cheapest lathe / minimum spec to turn steel?

    In the document it looks to me as if he is turning the entire length on a taper, hence the boring head installed on the tailstock. That is one method for taper turning. If he is indeed turning on a...
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    Re: Stripped the column cap head screws on g0704

    That's from a screen grab of a YouTube video I found. They do look nice.
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    Re: Stripped the column cap head screws on g0704

    Just for reference, these are the bolts the OP is talking about

    422902
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    Re: Stripped the column cap head screws on g0704

    Regardless, the bolt in question is recessed in a counterbore so you can't get an angle grinder on it to make a slot anyway.
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    Re: Stripped the column cap head screws on g0704

    It sounds as if the hex that the allen wrench fits into is what is stripped. If that is the case then the bolt will still be under terrific torque.
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    Re: Stripped the column cap head screws on g0704

    Never going to be able to loosen a madly torqued 12mm bolt with a screwdriver slot. If he has that kind of access then the absolute easiest way is to weld the shank of a bolt to the existing bolt and...
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    Re: Stripped the column cap head screws on g0704

    Go buy a screw extractor set. They make them for SHCS.
    ...
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