Complete set of fully detailed, dimensioned, engineering CAD drawings, with Installation Manual, for 3–axis CNC Leadscrew conversion.

 

 

Designed by the vendor and fully tested for the mini-mills listed below:

 

Lead-screw lengths could easily be adjusted for the larger table/travel versions, with the same table width (92mm)

 

Similar mini mills with different branding:

 

Harbor Freight Central Machinery (44911)

Axminster

Little Machine Shop HiTorque. (3990)

Cummins Toolnow (7887)

Homier Speedway (03947)

Chester Conquest

Sealey (Sm2502)

Grizzly (G8689)

Clarke (CMD300)

Draper (34023)

Sieg X2

Sieg/Axminster SX2

Holzmann (BF16V)

Rotwerk (EFM 200 DS)

Osaki (MMD250)

 

See Basic Checking Dimensions below before purchasing. 


Please note - This design is not suitable for the Sieg X2L, SX2P or SX2LF with the wider Bed, or similar looking mills with other branding. However, I cannot guarantee the results, but the designs could be adapted by modifying the dimensions on the Bed end plates to suit. If necessary, the Lead screw lengths could also be increased by the difference in the bed lengths (e.g. 460-385)  Also the Z-axis and Y-axis may need updates to suit.

 

 

What you will receive:

 

·        Complete set of fully dimensioned CAD drawings in PDF format (See also 2D DXF option below), detailing all the following parts and assemblies required to convert

     the X, Y and Z-axes to accept NEMA23 stepper motors:

 

      X, Y & Z lead-screws with adjustable anti-backlash nuts

X, Y & Z lead-screw supports/bearings

X, Y & Z NEMA 23 stepper motor mounts

 

·        A list of recommended material/part suppliers,

 

·        Complete list of fixings required.

 

·        A fully detailed 17 page, step-by-step Installation Manual with pictures, text and drawings. Supplied in PDF format.

·        A list of other parts required to complete the conversion.

 

·        Parts detailed have been, test fitted, and thoroughly tested for many hours on a working conversion. Designed to be easily made and fitted, with minimum modifications to the machine, using a small mill, and a small lathe.

 

·        2D DXF files are available, to help with any intended CNC manufacture of the parts. These are supplied at an additional cost of £9.99, and could save you a lot of time. Just choose before you buy.  

       Drawings can easily be printed on any A4 or A3 printer


 

What’s not included:

  • Drawings do not include details of electrical wiring information. Normally supplied by the Controller/Motor supplier.
  • Details of swarf guards etc.Details of any home/limit switches.
  • You are buying the Drawings and Manual only. No parts or materials are supplied
  • Listing shows images of the finished machine, for reference purposes.

 

Materials you will need:

 

  • Lead-screws, mild-steel, 14x3 trapezoidal threads, (Matching or home made tap will be required.) M14x2 stainless steel studding could be used.
  • Black Delrin®, which is an acetal polymer, engineering plastic, easy to machine. Free machining Aluminium (6082-T6/HE30) could be used.
  • Low cost sealed ball races, and thrust races, to mount the leadscrews.
  • White Delrin®, which is a highly effective bearing medium with a low coefficient of friction, extremely wear-resistant. Phosphor Bronze could be used

Design:

 

  • Designed for Home/DIY use. The typical uses that the milling machine itself was designed for. Not really aimed at production engineering applications.
  • Stepper motors (not supplied) are assumed to have M5 clearance fixing holes
  • Nuts are adjustable for wear, and when correctly set should give about 0.05mm backlash (which can be compensated for in Mach3® software etc)

 

  • The conversion will disable the manual operation of the milling machine. However, if stepper motors with double shafts are employed then some degree of limited manual use will be possible. No modifications will prevent the parts removed from being refitted to re-create the original manual machine, if ever the need should arise.
  •  The parts are designed to fit with the minimum modifications, by utilising existing fixing holes etc. However, 3 x M6 holes and 2 x M5 holes need to be drilled and tapped to fit the Z-Axis lead-screw, and a small modification to the saddle is required to fit the X-Axis lead-screw.

 

Basic Mini Mill Checking dimensions (in mm)

 

·        (X) Table (excluding lead-screw supports): 385 long x 92 wide x 31 deep, 220 travel, with 72 hole centres for lead-screw support fixing (M6)

·       (Y) Saddle: 150 long x 93 wide x 48 deep, 100 travel

·       (Y) Base: 50 hole centres for lead-screw support fixing (M6)

·       (Z) Headstock slide: 98 wide x 140 deep, 180 travel

 

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       Please Note - On receipt of PAYPAL payment,  Drawings and Installation Manual will be sent in PDF format, with optional DXF files.   *A free PDF reader can be downloaded from Adobe website.