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Type: Posts; User: Jim Dawson

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  1. Replies
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    Re: "Best" High End OEMs?

    Biesse is good https://www.biesse.com/na/wood/
  2. Re: 4th axis and small diameter parts - looking for ideas

    I would just thread the end of a piece of the largest bar stock you can fit in your chuck. Maybe taper the end for clearance if needed. Screw the bolt in and make holes.
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    Re: Buying mics on a budget

    I do have a 0-1 Mitutoyo mic that I have been using for the last 40 years. Been dropped more than once, but still seems to be accurate. I also have a set of old Taiwan mics about the same age, and...
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    Re: Buying mics on a budget

    When you start trying to measure +/- 1um, you need to ask at what temperature. Just because the instrument displays 4 or 5 digits to the right of the decimal point does not mean that the measurement...
  5. Re: Ok, this is about a project - and it's about ENCODERS!

    Normally the scale tape is the inexpensive part. I have been buying the magnetic scale tape at about US$35/meter. Not sure what the optical scale costs.

    I think the scale tape is a one use...
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    Re: Problem with Shaded-Pole Motor

    Try oiling the bearings with some light oil. The green wire looks like a ground wire.
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    Re: Older MT-22 Help needed

    MC normally used standard NEMA 34 frame motors, 86mm mount flange with 1/2 inch shaft. Servo motors with a NEMA 34 frame are readily available. My prefered vendor for servos is DMM Technologies. ...
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    Re: Need help to build wire band saw

    I guess I would cut a V-groove on the drive and idler wheel, then build a ball bearing guide for the wire at the cutting area. Maybe use a V-groove wheel as the guide wheel. Maybe something like...
  9. Re: I am totally new to CNC machining and Mazatrol and I need help, badly!

    Ask for the machine programming manual, they should have it. Time to do some studying. Google might be your friend here also, ''mazak quick turn 30 programming manual''
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    Re: ready to give up

    In CamBam you set the cut depth in the Cutting Depth section of the part machining setup. From here you can set the Clearance Plane, Depth Increment, Final Depth Increment, Stock Surface, and Target...
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    Re: Using 16mm pitch ground ball screws

    As near as I can find, the dynamic thrust load capacity on a 1616 2 start ball screw is 980 lbs. So about 2X the acceleration load that you propose.
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    Re: Using 16mm pitch ground ball screws

    Just to put this in perspective, I have a BP clone knee mill. The servos are 750W with a 2:1 belt reduction, 5mm lead ballscrews. I have not noted any accuracy problems with the belt drive. Any...
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    Re: Backlash compensation parameter?

    The real question is: Does it need to be adjusted? Is the machine running OK? If so, I would say nothing needs to be done.
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    Re: Using 16mm pitch ground ball screws

    Not sure what the motion card is in the picture. Never seen that one before. But here is all I could find about it EMOTIONTEK

    I would go with the 40x0.

    Just as an odd side note: I purchased...
  15. Thread: locking up

    by Jim Dawson
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    Re: locking up

    Maybe just a bad connection, you never know exactly when you don't find the problem. Happy to hear it's fixed.
  16. Re: MCG motor with Renco encoder question

    Those appear to be DC servos. Why not replace them with modern AC servos from DMM Technologies, looks like 0.40KW units would be about right based on the continuous torque rating of the existing...
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    Re: Using 16mm pitch ground ball screws

    The motor encoder would feedback to the drive as normal, and is required by the drive. The linear encoder would be connected to the controller and all of the position control is controlled from...
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    Re: C Axis opinions and help please

    What deadlykitten said ^^^^^
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    Re: Using 16mm pitch ground ball screws

    I'm not going to try to answer your question on the ballscrews other than to say that 400 W seems a bit light. This is just my gut feel, nothing to really back up that feeling.

    The only...
  20. Re: Running a 5.5/7.5 kw 8000 rpm Fanuc motor on a vfd.

    For that application, a 15HP single phase rated VFD should work OK. Something like this...
  21. Thread: locking up

    by Jim Dawson
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    Re: locking up

    That being the case, I would be looking at the electrical connections to the stepper drivers, or maybe a computer problem. Power supply problem? It is not likely that the stepper motors have...
  22. Thread: locking up

    by Jim Dawson
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    Re: locking up

    Maybe cleaning and lubricating the rails and screws would help. Sounds like there is some mechanical resistance to free movement.
  23. Thread: Nema 34

    by Jim Dawson
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    Re: Nema 34

    You are starting at the wrong place. Design and build your shredding system first. Then measure the torque required to run it. Then choose a motor/gearbox combination that will produce the...
  24. Thread: Nema 34

    by Jim Dawson
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    Re: Nema 34

    Well, maybe think in terms of a food blender. About 12,000 RPM and maybe 0.75KW or so.
  25. Thread: Nema 34

    by Jim Dawson
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    Re: Nema 34

    Look at the torque curves for your chosen stepper. The stepper torque drops off rapidly as the RPM increases. It depends on the torque required to run your proposed machine.

    There are other...
  26. Re: 3 axis compensation with macro programing?

    Sorry, I have no idea. I can't help with that.
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    Re: Older MT-22 Help needed

    From the pictures it seems that the spindle motor is 220V only, and the VFD is a 240V VFD (200V class, normally good for 180V to 240V)

    From the manual for the VFD, it is rated to run on 240V...
  28. Re: Vertical lift & lowering Camera Pole Sourcing Parts

    McMaster Carr will have everything you want. https://www.mcmaster.com/

    Almost every part they carry has CAD drawings available if you click on the part number.

    I'll vote for a chain & sprocket...
  29. Re: 3 axis compensation with macro programing?

    It should work by using cutter comp. But I normally measure the endmill, plug that value into the CAM program, and compile the G code with the correct endmill size. Optionally make a test cut, and...
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    Re: Haas TL1 new to threading

    I would start with 0.005'' DOC on the first pass, and back off the step down on subsequent passes, with a final pass at 0.000 step down for a cleanup. Maybe about 12 passes or so.

    Prehard A2 is...
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