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Type: Posts; User: Jim Dawson

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  1. Re: Which Motor to Choose When Buy CNC Router? Stepper or Servo?

    The interface port on the DMM units is a 25 pin D-sub connector like a printer port, but it is not a printer port connection. That is just the connector style that they chose to make the external...
  2. Re: Which Motor to Choose When Buy CNC Router? Stepper or Servo?

    While the ClearPath units are easier to wire with less external hardware required, they do have some limitations in the resolution. Where the DMM units have 16 bit encoders vs. the ~12 bit encoders...
  3. Re: Which Motor to Choose When Buy CNC Router? Stepper or Servo?

    My pleasure. Happy to help.

    750W might be a bit overkill, but no problem, you won't run out of power. And you can always dial the power back.
  4. Re: Which Motor to Choose When Buy CNC Router? Stepper or Servo?

    We won't shoot you today :)

    Centroid Acorn is just fine.

    A servo system is any closed loop system with feedback to a controller and a controller output to a device. A home heating system for...
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    Re: Construction of a CN lathe

    You might want to look at Delta or DMM servo motors for your spindle. Looking at the specifications for the 130ST-M15025, it seems that their 3.8kW motor is really closer to a 1.5kW motor.

    Here...
  6. Re: control rotating indexing table with 3PH motor

    This will damage the motor or VFD



    This is the proper way to do it. You can most likely set the acceleration to 0.1 second, almost instantaneous.

    The better method would be to control the...
  7. Re: Motor setup being used in this video. Heavy Z-Axis motor setup

    Clearpath motors are OK, a bit overpriced for what they are. I have used them in a couple of retrofits, but it has been my experience that the better value are the other brands I mentioned. I have...
  8. Re: Motor setup being used in this video. Heavy Z-Axis motor setup

    The motor in the video looks to be a 1.5kW to 2kW just based on the size. It is a servo motor, no idea of the brand. It also looks like it is attached to a reduction gear set of some kind.

    You...
  9. Re: Need advice on new CNC machine for small business woodworking

    It really doesn't matter. Either of these (or any machine) would be a used machine to fit in your budget, so you are just looking for one that meets your work envelope and is in reasonably good...
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    Re: 2D Aluminum 4mm or 3/32"

    I would send it off to SendCutSend. https://sendcutsend.com/ Instant quotes, very economical, free shipping, and fast turnaround.

    I have a full CNC shop and I still have them do small jobs for...
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    Re: Z Axis Troubles

    Sounds like a bad solder connection around the Z axis encoder connector. And maybe the encoder input is inverted from the original, this also could be a parameter setting. That may be why it is...
  12. Re: Need advice on new CNC machine for small business woodworking

    Sam-

    Your budget is reasonable for a used machine.

    A 4'x4' machine might be more common. But I think expandable might be an issue, not impossible, but it might make more sense to buy a larger...
  13. Re: Emco Compact 5 CNC lathe with tool changer - LINUX CNC, opto isolated parallel po

    Why not a DMM Technologies servo https://www.dmm-tech.com/

    or

    A SureServo2 (Delta) from Automation Direct. ...
  14. Re: Need advice on new CNC machine for small business woodworking

    What work area do you need?

    Budget?

    Are you willing to buy a used machine?
  15. Re: Looking for advice on balls crew nut repair

    Google Ball Screw Repair

    There are many shops available.
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    Re: My CNC Router Build Adventure

    Yes, 1 Watt is 1 Watt
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    Re: DC servo vibrates at rest

    Retuning is what I would do also. Try bumping up the KD parameter, makes it react just a bit slower without affecting the stiffness much. I guess the other possibility could be encoder noise, loose...
  18. Re: Dumb question about belt-driving vs direct driving a ballscrew

    What you are missing is the critical rpm of the ball screw. As the speed increases the chances of whipping increases. Depends on the length of the ball screw.

    EDIT Radial acceleration comes into...
  19. Re: Haas Super Mini Mill - Controlling the Coolant Blast

    We have a main valve on ours, just cut it back a bit. We also installed valves on each nozzle to adjust flow. You could also install a bypass valve to shunt some of the coolant back to the tank.
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    Re: VMC 10 green start button

    Check the stop button. It may not be making contact properly, not an uncommon condition.
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    Re: 21iT control retrofit?

    I just found the BOM for the retrofit on my lathe, turns out I was a bit high on the parts. It came out at $11K assuming all new parts, my actual cost was dramatically less because I had the...
  22. Re: What steel would you machine these from?

    For the tooling plate I would make that from 4140 or 4340, or at least one of the 4xxx series of steel. Good strength and reasonably easy to machine. Can be heat treated if desired.

    For the tool...
  23. Re: Edge finder on a non-perpendicular edge?

    I guess you could edge find on an angled surface if you were exactly the same height on both sides, and the sides are symmetrical. I have never actually tried it.
  24. Re: Edge finder on a non-perpendicular edge?

    If the V-blocks are exactly the same, and the part is symmetrical, then measure the distance between the vice jaws and divide by 2

    I'm a bit confused that a face is not perpendicular to a table...
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    Re: 21iT control retrofit?

    About 3 years ago I went through exactly the same thing with my lathe and for the same reasons. I have a very low tolerance for antique controls. My controller was a Fanuc OT with red cap motors. ...
  26. Re: Cheap router bits for 'kitchen facade' door milling

    Router Bit World and Amazon
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    Re: Dumb move requiring smart remedy…

    We've all been there a time or two. You did exactly what I would do. :cheers:
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    Re: Shipping a 440?

    Personally I would make a road trip, about 12 hrs. each way from SFO. The cost of motor freight is crazy today. If you don't have a truck, U-Haul trailers are cheap. Also U-Haul wants to move...
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    Re: Dumb move requiring smart remedy…

    Yup. :)
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    Re: Help picking a new CNC mill

    If the Pocket NC has the work envelope you need then that seems like a pretty good deal.

    The next step up is Tormach machines. But only the 440 starter machine in in your budget range.

    Don't...
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