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Type: Posts; User: LeeWay

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  1. Replies
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    Re: building large CNC on budget

    It was the 10 foot tall Z axis that caused my response. :)

    That requirement alone means you cannot under build the supporting structure.
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    Re: building large CNC on budget

    No where near realistic on that budget.
    You could build a 1/10th scale of that for a little less than that.
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    Re: I may have under sized my gantry beam.

    Not necessarily the strength of the bearings. That flat bar is cold rolled steel. It will wear depending on a lot of factors, but weight is definitely one of the main contributors.
    Also a human...
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    Re: I may have under sized my gantry beam.

    In the same vein as the gantry you have chosen was not really sufficient to do the job without some error, the larger options you are looking at now are probably way too large for roller skate...
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    Re: I may have under sized my gantry beam.

    If I were intending to beef up the structure of the beam, then I would find the closest fitting pipe that I could slide inside of it. Then fill the outside of that pipe with epoxy or even concrete....
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    Re: I may have under sized my gantry beam.

    So you will be cnc machining both the recesses and the inlays?
    Then you mention "Fit Perfectly".

    There are other factors involved in doing this kind of material combining. It isn't something that...
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    Re: I may have under sized my gantry beam.

    I think it may be easier to describe what is not rigid.
    And again it is about what the machine is designed to do and it's size as well as speed and accuracy while doing that.
    On the gantry in...
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    Re: I may have under sized my gantry beam.

    Right.
    That was static weight too. Add the weight o the Z axis as well. Then when you add in the driving forces of the weight of the whole gantry, it uses that weight against itself when it changes...
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    Re: I may have under sized my gantry beam.

    This was what I call the standard. 80/20, but I know there are many sources. But when discussing CRP machines, they use 80/20 exclusively as far as I know.
    80/20 has a light version extrusion and...
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    Re: I may have under sized my gantry beam.

    The 3x3 heavy extrusion is quite a bit stiffer than the 1/8 in wall tube by itself. It has the added benefit of all the inner webbing to help support it.
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    Re: I may have under sized my gantry beam.

    I designed my plasma cutter the same way. It does use CRP trucks and drive components. The First design they had uses roller skate bearings on flat bar rather than V wheels and later profile linear...
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    Re: I may have under sized my gantry beam.

    Cost can certainly be an issue. You might want to proceed with the build and upgrade later.
    You can setup an easy test to see what you have. Support the beam on both ends.
    Put a dial indicator in...
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    Re: I may have under sized my gantry beam.

    It will flex and flex alot. Especially in the middle. It isn't really worth the effort to try and beef it up. It would be fine for a plasma cutter, but not for a machine with cutting forces. I don't...
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    Re: CNC router to 3D Printer conversion ?

    You can also run all the thermal parts off of a separate box and run them off of a different power supply or even AC voltage for extremely fast heat up times. This does not place extra draw on the...
  15. Re: CNCRP4848Pro Exceeding Z Travel Limits...or at least trying to...

    Glad I was able to help. Have some fun with it. :)
  16. Re: CNCRP4848Pro Exceeding Z Travel Limits...or at least trying to...

    Oh and look at the Post Processor that you are using in Vcarve. There are a lot of Mach 3 Posts. Some in inches and the rest are no good. :)
  17. Re: CNCRP4848Pro Exceeding Z Travel Limits...or at least trying to...

    I just took it from the material size you showed above. That is either metric or CRP is making some really big kits now. I would think at most you only have 6 or 8 inch Z travel. Mine has a little...
  18. Re: CNCRP4848Pro Exceeding Z Travel Limits...or at least trying to...

    The Gcode will have G20 for inches or G21 for metric. Vcarve is outputting metric. You will have to pick a system to use to keep from making errors.
  19. Re: CNCRP4848Pro Exceeding Z Travel Limits...or at least trying to...

    Lets see the first lines of Gcode.
  20. Re: CNCRP4848Pro Exceeding Z Travel Limits...or at least trying to...

    Okay.
    Check the clearance height either in Vcarve or in the Safe Z settings under config.
  21. Re: CNCRP4848Pro Exceeding Z Travel Limits...or at least trying to...

    Zero out the Z axis. Then jog upward. Is it now reading a negative number?
    If so, it is backwards.You can change direction under the config, homing and limits.
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    Re: CNC machine made out of granite

    Nothing really stopping a guy from putting a spindle on each side of that gantry beam. Not only could you machine the full bed length, but you could machine the ends of longer parts too. :)
    Also if...
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    Re: Spindle failed after only 229 cutting hrs?

    That is about what I gathered from reading about spindles and repairs. Thanks for the confirmation.
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    Re: Spindle failed after only 229 cutting hrs?

    So did they charge a core charge for the old spindle?
    Do you have to ship it back?
    If not, you have a golden chance to see what went wrong and possibly rebuild it yourself or someone locally and...
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    Re: Spindle failed after only 229 cutting hrs?

    Does Haas ever use ceramic balls?
    It doesn't sound like a wear issue but an instant ball failure during the tap cycle.
    Steel balls would not be as easy to fail as ceramic ones would be.
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