Instant Z Axis Assembly

Whenever I had to build another small CNC machine, I always found that the X and Y axes were fairly simple to build, but the Z axis was more difficult. While assembling a slide for a chap up in New Hampshire, it occurred to me that a standardised slide with a bunch of mounting options was a good idea. The Instant Z Axis is the result. $165.00 for 1 Instant Z with Iron/Copper bushings, $225.00 for 1 with Thomson Linear Ball Bushings with seals.(plus shipping.)

Spindle not included!

The slide rods are Thomson 1/2" rods in either Iron/Copper bushings or Thomson linear recirculating bearings. The slide is approximately 2.5" wide by 3" deep by 12" long (with the stepper motor installed.) It has 3" of travel. It has several holes in the back plate for mounting; 4 holes 17/64" and 4 holes tapped 1/4-20 in addition to a hole in the center for locating.

The lead screw is 1/2-10 acme with a direct coupling to a size 23 stepper motor. Thrust is taken up by a flanged bronze bushing and lock collars. Single full step reolution is .0005". I have one like this on my PCB machine,(see picture below) and have been using it for 5 years now with no part replacements. The holder you see on the slide holds my motorised spindles for PCB engraving.

To my mother, who left us January 24/03, thanks for always being amazed and delighted at my little gadgets.You were an island of compassion in a sea of indifference.

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