Optimum BF20L CNC conversion


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Thread: Optimum BF20L CNC conversion

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    Registered JanHenning's Avatar
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    Default Optimum BF20L CNC conversion

    Welcome!

    I have just started the conversion of my BF20L. I will post pictures as the project moves along.

    Manufacturer: www.optimum-maschinen.de
    Machine: http://www.optimum-machines.com/prod...rio/index.html

    Things I have done so far:
    - Made Z-axis motor mount in steel
    - Made block between Isel ball-nut and headstock
    - Machined the ends of the Z ball-screw
    - Made more room around the upper part of Z thrustbearing, and shimed the lower part of it with thin shrink tubing to snug fit
    - Mounted the original thrust bearing for Z-axis under the top plate to eliminate slack.
    - Made room for the Y-axis ball-nut in the base of the mill, and modified for 200mm Y-travel
    - Made Y-axis motor mount in aluminium at the back of the mill
    - Made a temporary housing for the controller
    - Assembled the Z-axis and tested it. Lift 95kg easily (Me)

    Parts used:
    www.homeshopcnc.com : RS34-960 (3)
    www.homeshopcnc.com : G203V (3)
    www.homeshopcnc.com : Opto-isloated breakout board (1)
    www.homeshopcnc.com : 65V, 12A Power Supply (1)
    www.homeshopcnc.com : MPG 101B 28 Function Hand Controller + MINI-IO (1)

    www.worldofcnc.com : ISEL 16 x 05 Spindle (X/Y)
    www.worldofcnc.com : ISEL 25 x 05 Spindle (Z)
    www.worldofcnc.com : ISEL3 16 x 05 (2)
    www.worldofcnc.com : ISEL3 25 x 05 (1)
    www.worldofcnc.com : ISEL Ballnut Housing 16mm Base (2)
    www.worldofcnc.com : ISEL Ballnut Housing 25mm Base (1)
    www.worldofcnc.com : ISEL Ballnut Wipers/Seals (3)
    www.worldofcnc.com : Energy Chain (1 for X)
    www.worldofcnc.com : SRJ-30C-RD-10 X 12.7 (2)
    www.worldofcnc.com : SRJ-30C-RD-12 X 12.7 (1)
    www.worldofcnc.com : Grease

    www.fag.com : Extra thrust bearing for Z-axis

    CNC Software:
    www.artsoftcontrols.com : Mach 3
    www.candcnc.com: Plugin for IO and MPG 101B

    Credits to my cousin Jon, who is my mentor in mechanical engineering and design, and of course to all you posters on CNC Zone!

    Similar Threads:
    Attached Thumbnails Attached Thumbnails Optimum BF20L CNC conversion-01-maskinering-av-motorfeste-jpg   Optimum BF20L CNC conversion-04-z-axis-upper-thrust-bearing-jpg   Optimum BF20L CNC conversion-05-z-axis-lower-thrust-bearing-jpg   Optimum BF20L CNC conversion-02-feste-mellom-kulemutter-og-fres-jpg  

    Optimum BF20L CNC conversion-03-kulemutter-og-skrue-jpg   Optimum BF20L CNC conversion-06-feste-mellom-kulemutter-og-fres-jpg   Optimum BF20L CNC conversion-07-stepper-coupling-jpg   Optimum BF20L CNC conversion-08-ysteppermount-jpg  

    Last edited by JanHenning; 02-03-2008 at 10:27 AM.


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    Smile

    - Y ballscrew machined to 10mm on both ends
    - M8 threads and key for handwheel machined on the front end
    - No bearing support in the back of Y-screw
    - Mounted the ballnut on Y-screw and assembled the thrustbearings.
    - Y-screw moves smooth and free of slack

    Next: New support plate for X/Y ballnuts. We have to remove some of the material under the table, to make room for x-ballnut. The table is 9,5mm at it's thinnest, and 3mm have to be machined away.

    Good fun!

    Attached Thumbnails Attached Thumbnails Optimum BF20L CNC conversion-09_y-axis_in_cnc_lathe-jpg   Optimum BF20L CNC conversion-10_y-axis_in_mill-jpg   Optimum BF20L CNC conversion-11_y-axis_in_place-jpg   Optimum BF20L CNC conversion-12_y-stepper_mounted-jpg  

    Optimum BF20L CNC conversion-13_progress_so_far-jpg  


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    the little block with the red screw driver is it for your z axis i am wondering cuz the plan i got i got from weiss in china shows that the block that attaches to the head and the screw of the z axis is like press fited in the z saddle if you can let me know exactly how you connected the ballscrew to the z saddle i would appreciate

    The opinions expressed in this post are my own. -Les opinions exprimé dans ce messages sont les mienne


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    Quote Originally Posted by ataxy View Post
    the little block with the red screw driver is it for your z axis i am wondering cuz the plan i got i got from weiss in china shows that the block that attaches to the head and the screw of the z axis is like press fited in the z saddle if you can let me know exactly how you connected the ballscrew to the z saddle i would appreciate
    Hi,

    Ball nut base

    Ball nut

    - The Isel base is locked to the nut with a set screw.
    - The mounting holes in the base could not be used, so we had to drill and tap 4 holes.
    - The block is then bolted to the base. The base fits precisely between the "tabs" in the block.
    - The block fits the saddle, and we used the original screws.

    There is no shims or sliding parts. Just a block that fits between the ballnut base and Z-saddle.

    Attached Thumbnails Attached Thumbnails Optimum BF20L CNC conversion-base-block3-jpg  
    Last edited by JanHenning; 02-09-2008 at 03:10 AM.


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    ok thx, thats what i tought
    so how do you like your bf20

    The opinions expressed in this post are my own. -Les opinions exprimé dans ce messages sont les mienne


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    Registered JanHenning's Avatar
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    I haven't tested it much yet, but it seems like a rigid machine for it's size. I will give a full review when the conversion is done, and it's up running again



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    A little progress with the control box tonight. The casing is from a charger that was rated at 70/90A @ 12V, so the heatsink is massive. A fan mounted over the drivers will suck out warm air. I plan to make a filtered air intake at the back.

    New frontplate and mounting bracket for the two parallel interfaces will be among my first CNC projects.

    Attached Thumbnails Attached Thumbnails Optimum BF20L CNC conversion-jh0_1007-jpg   Optimum BF20L CNC conversion-14_kontrollboks_top-jpg  
    Last edited by JanHenning; 02-13-2008 at 07:22 PM.


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    Almost finnished with the conversion now.
    - Made a adapter plate for x and y ballnut
    - Machined room for the ballnut fixing plate in the xy saddle
    - Machined away 3mm along the underside of the table
    - Mounted the x and y ballnut
    - Machined the ends of the x ballscrew

    Next we will make a stepper mount for X, and then it's time for tuning and setup. Will start mounting limit switches this weekend.



    Attached Thumbnails Attached Thumbnails Optimum BF20L CNC conversion-16_x-slide1-jpg   Optimum BF20L CNC conversion-17_x-slide2-jpg   Optimum BF20L CNC conversion-18_y_ballscrew-jpg   Optimum BF20L CNC conversion-19_machining_table-jpg  

    Optimum BF20L CNC conversion-20_x_ballscrew-jpg  


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    Did you scrape the ways or did it come like that?

    Beautiful job, I like the y-axis stepper motor mounted in the back; much more elegant then hanging it off the front.

    Did you build the base yourself? How about a couple of pictures of it?

    What type of manual mill is that? Sort of looks like a horizontal mill with a vertical attachment.

    Last edited by tmarks11; 02-16-2008 at 08:41 PM.


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    Hi Jan,

    Nice conversion! I have a BF20L bought from top-maschinen.de last May. Got the Optimum ball screws though and only made the motor mounts myself. Works nicely, just ca 0,05 mm backlash.

    The hard part is making the G-code for my 3D-parts

    Regards Björn
    Stockholm, Sweden



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    how much is the ballscrew kit for the bf20-L

    The opinions expressed in this post are my own. -Les opinions exprimé dans ce messages sont les mienne


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