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  1. #41
    Join Date
    Oct 2009
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    733

    Re: David A's New 2x3 Bench Top CNC

    Assembling the X-Carriage:

    Install one side plate to the lower plate using the standard 8MM screws for the pillow blocks:
    Attachment 413230

    And then the other side plate:
    Attachment 413238

    And finish the frame with the lower plate:
    Attachment 413240

    Side view:
    Attachment 413242

    And for demonstration, the X-brace on the back:
    Click image for larger version. 

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    You are welcome to utilize any parts of the design for your personal use.
    Please contact me for commercial applications.

  2. #42
    Join Date
    Oct 2009
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    733

    Re: David A's New 2x3 Bench Top CNC

    With the X-Carriage assembled, the Z-Slide can be inserted:
    Attachment 413250

    Back views:
    Click image for larger version. 

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ID:	413252

    Click image for larger version. 

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ID:	413254



    You are welcome to utilize any parts of the design for your personal use.
    Please contact me for commercial applications.

  3. #43
    Join Date
    Sep 2005
    Posts
    1740

    Re: David A's New 2x3 Bench Top CNC

    Quote Originally Posted by davida1234 View Post
    Hi wmgeorge, do you mean the machine frame's side rails or the x-carriage side plates?

    The spindle is the standard Chinese 80MM 2.2kW spindle.
    Your side rails with the linear rails on for the Y. They are very high off the frame and not that wide. Most machines have 3 or 4 inch wide rails and are much lower as this one. http://www.cncrouterparts.com/images...4_Base_800.jpg

    My Saturn 2 from FLA has 3 inch square steel welded.

    Or this one from Camaster https://www.camaster.com/wp-content/.../Stinger-I.jpg
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router Mach4 Kimber 1911 45ACP

  4. #44
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    Oct 2009
    Posts
    733

    Re: David A's New 2x3 Bench Top CNC

    Thanks for the input. The Saturn is one of my all time favorite designs and, admittedly, was a starting point for my design. I did the side rails with 3030s first and still have them. But the machine being a test mule, also built the thinner ones with 1530s, thinking that the 3030 looked so massive. Want to explore if the thinner frame will support the side loads. If I get any flexing or twisting, I will revert to the 3030 frames.

  5. #45
    Join Date
    Sep 2005
    Posts
    1740

    Re: David A's New 2x3 Bench Top CNC

    I would go back to the 30x30 now because once you get it running it will be so much fun you will not want to redo then, I have cut and routed some 1/2 and 3/4 MDF and besides being dirty its tough but it carves so nice. I have done 2 inch thick walnut live edge slabs and it takes all the Hp I have to get it turned into a nice planed finish. I have a decent dust collector and would not cut without it with the MDF.

    The rest of the machine looks very nice!
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router Mach4 Kimber 1911 45ACP

  6. #46
    Join Date
    Oct 2009
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    733

    Re: David A's New 2x3 Bench Top CNC

    Just trying it out (with no oil yet in the ball bushings):

    https://youtu.be/JhOw7HKrhZA

  7. #47
    Join Date
    Oct 2009
    Posts
    733

    Re: David A's New 2x3 Bench Top CNC

    wmgeorge, thank you for your encouragement. The machine is already 3/4 built and I built it for testing. The thin side walls are built with a shear panel inside which is permanently attached with ss anchors and FRP in the channels. I want to particularly test how they will perform as it will reduce the width by 3".

    I will need all the help I can get from you and everybody else with the electrical and setup because that's where I am pretty clueless.

  8. #48
    Join Date
    Oct 2009
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    733

    Re: David A's New 2x3 Bench Top CNC

    With the X-Axis and Z-Slide finished, it's time to put that assembly on the gantry!

    Just move the setup over the gantry linear rails:
    Attachment 413256

    Attach loosely onto the top rail blocks:
    Attachment 413258

    Install the proximity sensor. There is provision for another sensor if needed:
    Attachment 413260

    Attach the lower plate to bottom rail blocks as well.

    X-Carriage and Z-Slide is on the gantry!
    Click image for larger version. 

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ID:	413262

  9. #49
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    Oct 2009
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    733

    Re: David A's New 2x3 Bench Top CNC

    With the main assemblies of the machine mostly finished, time to move onto the details.

    First, the weight of the Z-Slide will be balanced with springs to provide an equilibrium.

    I use four small springs. Unfortunately, I could not source SS springs with the required properties:
    Attachment 413314

    Slip two of them onto the 3/16 spring pin and drop in place:
    Attachment 413316

    Attachment 413318

    That's how it looks like from the side:
    Click image for larger version. 

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ID:	413320

  10. #50
    Join Date
    Oct 2009
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    733

    Re: David A's New 2x3 Bench Top CNC

    Next, bend a small hook at one end of a 12ga wire and push it up from the bottom:
    Attachment 413324

    Catch the loop of the inside spring:
    Attachment 413326

    Pull down the spring and place it onto the inside position of the spindle mount bar:
    Click image for larger version. 

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ID:	413328

  11. #51
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    Oct 2009
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    733

    Re: David A's New 2x3 Bench Top CNC

    Pull down the same way the second spring:
    Attachment 413330

    And place it on the outside position of the bar:
    Attachment 413332

    Repeat the same on the other side for the remaining two springs.

    The four springs balance the weight of the Z-Slide and the spindle nicely at about half way of the Z travel.
    If equipment weight changes, there are simple spacers that can be placed under the top pin:
    Attachment 413334

    Attachment 413336

  12. #52
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    Sep 2005
    Posts
    1740

    Re: David A's New 2x3 Bench Top CNC

    So you not only lifting the weight of the spindle, but that massive mount for it and the those heavy steel round bars. A lot of extra weight compared to others of the same size.
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router Mach4 Kimber 1911 45ACP

  13. #53
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    Oct 2009
    Posts
    733

    Re: David A's New 2x3 Bench Top CNC

    Good point wmgeorge. The complete setup with everything including spindle, weighs about 25 pounds.

    I don't know how that would compare to a conventional, fairly heavy duty Z-slide, with the linear rail part,
    the spindle mount, the extension plate which usually is necessary, screws/bolts, spindle, etc.
    Click image for larger version. 

Name:	Weight Z-Axis.jpg 
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    Also, please note that the mount provides a full 4" of spindle clamp height for a firm hold of the spindle
    body which very few mounts would provide, I would think.

  14. #54
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    Oct 2009
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    733

    Re: David A's New 2x3 Bench Top CNC

    Another point I would like to make is the leverage on the Z-Slide.

    From what I saw on conventional Z-slides, the spacing of bearing points of the
    Z-axis are usually fairly close to each other to provide for max. vertical movement,
    thus creating a large cantilever of the Z-slide.

    On this layout, the bearing points are much farther apart, with the spacing
    of bearing points being larger than the cantilever distance (B) even at the
    bottom of travel:
    Attachment 413404

    The point I am trying to make is that this is a test mule where this new layout
    has nothing proved yet. Right now, the shafts are 30MM. Once I get to the
    cutting phase, maybe it turns out that the shafts are over sized, maybe 25MM
    or even 20MM would be sufficient which would reduce the weight even further.

  15. #55
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    Sep 2005
    Posts
    1740

    Re: David A's New 2x3 Bench Top CNC

    I do a lot of 2.5 D work and V Carving. I also cut MDF board so I need speed on the Z for one yet heavy duty for the other. I have a NEMA 34 motor driving the Ball screw and running on linear rails. My Z is maybe 10-15 Lbs. I have the speed for the carving, and durability for the MDF.
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router Mach4 Kimber 1911 45ACP

  16. #56
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    Oct 2009
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    733

    Re: David A's New 2x3 Bench Top CNC

    That's great info, thank you. The servo I have is a lower power Teknic.

  17. #57
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    Sep 2005
    Posts
    1740

    Re: David A's New 2x3 Bench Top CNC

    On your drawing above you show both A & B having the same direction of force. Actually when cutting or engraving but not so much, a twisting action force is present, on the Z carriage which is transferred to the gantry as well. Perhaps thats the reason most builders are using the flat linear rail and bearings?
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router Mach4 Kimber 1911 45ACP

  18. #58
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    Oct 2009
    Posts
    733

    Re: David A's New 2x3 Bench Top CNC

    wmgeorge, of course you are correct and have a keen eye. The upper blue arrow is actually the other way and the lower blue arrow is almost the fulcrum. This was more to show the spacing of the two bearing points (A) relative to the distance (B) of the cutting force and the two blue arrows opposing the cutting force looked more descriptive to me.

    I have to be more careful next time I paste a quick sketch!

  19. #59
    Join Date
    Jan 2005
    Posts
    15362

    Re: David A's New 2x3 Bench Top CNC

    Quote Originally Posted by davida1234 View Post
    wmgeorge, of course you are correct and have a keen eye. The upper blue arrow is actually the other way and the lower blue arrow is almost the fulcrum. This was more to show the spacing of the two bearing points (A) relative to the distance (B) of the cutting force and the two blue arrows opposing the cutting force looked more descriptive to me.

    I have to be more careful next time I paste a quick sketch!
    You are on the right track the design is good I have a similar but quite different design same idea and principle just waiting for a patent on the design before I show it here
    Mactec54

  20. #60
    Join Date
    Oct 2009
    Posts
    733

    Re: David A's New 2x3 Bench Top CNC

    Thank you for the encouragement mactec54. This prototype was planned to have a
    slightly different approach to some of the conditions on a conventional CNC.

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