[keith20mm]

I have an Acra Mill model XJ5523 that I'm converting to CNC.

The table measures 9" x 42".

The table yoke is made in two castings, one for X- and one for Y-. Both axes use counterpoised bronze Acme nuts. The Y- nut bracket is mounted using two roll pins and two screws. The X- nut bracket mounts using four screws. The Y- nut bracket sits in the middle of the X- nut bracket.

The center-to-center hole spacing for the X- nut bracket is 3-1/8" left to right, and 3-3/4" front to back.

I am needing a single piece yoke that will fit the ground Hiwin ball screws:

42" BG3205X-42 R32-5.08B2-FSV-865.38-1320.8-0.012 A10JSGA1 (http://hiwin.com/pdf/bs/Retrofit_Bal...s/A10JSGA1.pdf)
12" BG3205Y-12 L32-5.08B2-FSV-425.96-591.82-0.012 A10JSIA1 (http://hiwin.com/pdf/bs/Retrofit_Bal...s/A10JSIA1.pdf)

..and, the yoke must fit this model mill.

Do any of you know of a source for the X-Y- yoke for these screws/mill?

The Hiwin yoke, by the way (http://hiwin.com/pdf/bs/Retrofit_Bal...s/7L0002A3.pdf) bolts to the saddle on a 2" x 3.56" pattern (50.8mm x 90.5mm).. I presume this is an actual Bridgeport yoke bolt layout.

Thanks in advance.

k

[keith20mm]

I was not able to locate any yoke casting meeting the dimensions of the saddle mount screws/ball screw nut axis requirements for this machine.

I ended up setting up the two yoke castings and boring them to size, locating ball screw nut flange mounting holes, drilling/threading those, and milling out the area for the nut's ball return tubes.

Why this mill was built with a two-piece yoke is not clear to me.

To add more information to this mill, the nameplate on the head reads Acra Mill, and the nomenclature plate shows XJ5523, is 9x42.

The operation manual shows King Grand Machinery Co., Ltd., Shenyang, China.

The Z-axis is now fitted with Elrod quill kit. This kit fitted with no adventure.

Using the original castings was, in the end, probably the best approach, as it would not be very easy to accurately determine if a new casting's nut x- and y- axis were correctly aligned.

[Se5a]

Keith can you pm me I have a question


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[keith20mm]

You do not have PM enabled.

try kdopson at sbcglobal.net