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Type: Posts; User: Jim Dawson

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  1. Thread: fusion360

    by Jim Dawson
    Replies
    5
    Views
    30

    Re: fusion360

    Try selecting only the outside chain. Seems to work for me. Now why it doesn't work like before, I have no idea.
  2. Re: Direct drive ? Geneva mechaniusm or belt drive tool carousel ?

    I think you have it.
  3. Re: Direct drive ? Geneva mechaniusm or belt drive tool carousel ?

    The geneva mechanism just simplifies the controls a bit, and does not require an axis to make it work. Other than that, they are slow and must index one tool at a time, where a stepper or servo...
  4. Replies
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    77

    Re: CHNC 1 retrofit

    I designed and built my own system. Also wrote my own CNC operating software to run it all, and used a Galil motion controller as the heart of the system. But this is not something the average user...
  5. Re: Need help - Lathe Build, trying to understand requirements/limitations

    Software based backlash compensation is marginal at best, and doesn't work well at all on any cut with an arc. You can bias the mechanics with an air spring to always keep the moving load tight...
  6. Re: Need help - Lathe Build, trying to understand requirements/limitations

    It is possible to do any lathe operation without ball screws. But you do need mechanical backlash compensation to pull that off. I won't go into the details here, but it's possible to do it at...
  7. Replies
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    77

    Re: CHNC 1 retrofit

    Those are nice machines.

    How you proceed really depends on your experience with control systems. 3 axis mills and routers are pretty simple for the first time builder. Simple lathes are not much...
  8. Replies
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    102

    Re: Is a 4th Axis build worth the work?

    Your shop and panel look fine, I'm embarrassed about mine also. Most home shop panels start out pretty neat and clean, then comes the feature creep. You just stuff parts in where you can fit them. ...
  9. Replies
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    93

    Re: Kent Knee Mill Single Phase Options

    On my 3hp machine, I have if fed with a 30 amp breaker and #10 wire from the shop panel. Then #12 from the VFD to the motor. I've had no problems.

    #12 from the machine panel breaker to the VFD...
  10. Re: Options for boring hole, high quantities

    I would interpolate the hole to around 0.985, then ream. Use a good quality carbide tipped reamer. A floating reamer holder would be the best. It might take a little playing around with feeds &...
  11. Replies
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    93

    Re: Kent Knee Mill Single Phase Options

    After looking at your part number, it looks like that drive is rated for single phase input so no derating is required. I would use a 30 amp breaker and #10 wire to feed it, same as my machine.
  12. Replies
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    Re: cnc knee mill gearing

    Every BP type CNC knee mill that I have seen either uses a 0.200'' or 5mm ballscrew. I can think of no reason to use a 10mm ballscrew. I'm not sure what your value of 7500 is, mm/min?

    My machine...
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    Re: Shaped sheet metal punch

    In my shop I would use my vertical band saw or my Evolution saw to cut into bite sized pieces. Water jet cutting would be good option, in fact, I would be tempted to have the pieces roughed out with...
  14. Replies
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    93

    Re: Kent Knee Mill Single Phase Options

    After a quick browse through the manual, it looks like that VFD is rated for both single phase and 3 phase with no derating. Can you provide the exact part number or a better picture from the data...
  15. Replies
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    2,743

    Re: Shaped sheet metal punch

    I'm not exactly sure what the scale chemistry is, but it is like carbide. I normally take at least a 0.020'' depth of cut to clean it up, using a carbide insert face mill. Whatever it takes to get...
  16. Replies
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    102

    Re: Is a 4th Axis build worth the work?

    A 4th axis is like toilet paper, it is better to have it and not need it than to need it and not have it. I built my 4th axis to do one job that needed a 4th axis to accomplish. Since then I use it...
  17. Re: Can linear encoders be combined with digital step drives?

    I guess you could have spring tensioned pinion engagement. I don't think I have ever seen it done, but it should work OK.
  18. Re: Can linear encoders be combined with digital step drives?

    No matter how hard you try, you are not going to turn a $5000 machine into a $500,000 machine by adding linear scales. But it's possible to make a bit more accurate machine with linear scales and...
  19. Re: Can linear encoders be combined with digital step drives?

    About $100/axis for 1 micron units, I prefer magnetic linear encoders.



    It is possible to create a dual loop system. But normally you would look at the load position vs. the commanded position...
  20. Re: Drilling Holes Through Copper with Extreme Accuracy

    A bit better description would help. Define ''extreme accuracy''. What size holes? 3 inch thick solid copper blocks? What does not align? Is the hole in the same place on one side of the pieces...
  21. Re: DIY - Choosing MCBs and magnetic contactors, etc. - need advice

    You really don't need both an E-stop button and a power off button. Just the E-stop button will be fine. But you do need a momentary contact power on button. You can call this button ''Control...
  22. Replies
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    Re: Omax Waterjet startup

    Check for sure with a volt meter, but yes, red=+5V, yellow = +12V, and black = common
  23. Re: DIY - Choosing MCBs and magnetic contactors, etc. - need advice

    Sorry, I should have labeled things for you. This drawing does not show the 240V power connections, this is only the 24VDC control power. Please understand that the drawing above is not for a CNC...
  24. Re: Using HAAS G71 bolt arc using first hole as reference, not center of bolt circle.

    I would just redraw the part in CAD and reference the holes to a location on the part. Looks like all the dimensions are on the drawing so should be pretty easy.
  25. Re: DIY - Choosing MCBs and magnetic contactors, etc. - need advice

    120VAC pilot devices are acceptable per NEC. 230V and 460V are acceptable for some very special use cases that we as hobbyists do not run into often. In this case Tom already has 24VDC power on the...
  26. Re: DIY - Choosing MCBs and magnetic contactors, etc. - need advice

    A relay or contactor can be thought of as a remote controlled switch. You energize the coil and this electromagnetically closes the contacts, thus you can control multiple contacts with a single...
  27. Re: DIY - Choosing MCBs and magnetic contactors, etc. - need advice

    Take a look here...
  28. Re: DIY - Choosing MCBs and magnetic contactors, etc. - need advice

    I think that's what I used in the panel above. At least they are from a reliable vendor. The ones you buy on eBay or Amazon I would not trust. Some of them are counterfeit, just a switch made to...
  29. Re: DIY - Choosing MCBs and magnetic contactors, etc. - need advice

    My pleasure

    If you use a 40 amp breaker, you are going to have to use #8 wire from the shop breaker panel to the machine. If you already have a 30 amp installed and have #10 wire to the machine,...
  30. Re: DIY - Choosing MCBs and magnetic contactors, etc. - need advice

    1.1) 30 amp circuit might be OK, 40 amp might be safer to prevent nuisance trips on startup. The Delta manual suggests a 10 amp breaker for the drives

    1.2, 1.3) I normally use one breaker for...
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