Shop-Floor Magic: Shimming Lathes and Rolling a VMC Through a Low Door

Brochures rarely resemble actual factories. A customer’s door may occasionally be a few centimeters too small for your machining center, and center heights don’t always line up precisely between engine lathes. Here are two solutions that have been purposefully and safely implemented in the field.

1) Lathes: Is It Reasonable to Shim the Tool?

In a nutshell: Yes. If done correctly, shimming the toolholder a little is a common and sensible method of achieving center height on conventional lathes.

Product spotlight: C0636B bench lathe

A widely featured “popular/recommended” manual lathe on the WMT CNC site. It’s presented as a rigid, stable, accurate benchtop machine and is repeatedly highlighted in their “Popular Recommended Lathe Machines” list and shipment posts—making it a solid reference point when discussing everyday shimming and setup on conventional lathes.

Why shimming is needed

• Posts and machines have different center heights.
• The stack-ups of inserts and toolholders differ.
• Not every post has a fine height adjuster.

Good practice

• Use proper shim stock: ground steel or brass; avoid soft scrap that compresses. Keep a labeled shim kit (e.g., 0.1/0.2/0.5/1.0 mm).
• Minimize stacks:a couple of pieces is fine; if you need a “sandwich,” you probably need a different holder or a post with height screws.
• Verify on center:quick face-cut test (no pip/no dish), or use a dead center and a ruler/center-finder.
• Maintain rigidity:ensure full contact of the toolholder on the post; no rocking.
• Record the setup: note shim thickness for repeat jobs.

Cautions

• Don’t go over the clamping range. Make the necessary adjustments if the tool is difficult to hold.
• Shims may have settled after a crash, heavy cut, or heat cycle, so double-check.

2) Low Doorway, Tall Machine: Getting a VMC Inside

Situation: A typical VMC cannot reach the customer’s factory door because it is too low. The VMC650L, for instance, is unable to pass through at full shipping height.

Planning first

• The floor’s levelness, any overhead obstructions, and the clear opening (finished height) should all be measured twice.
• Verify what can be taken out by consulting the builder’s or rigging manual. This avoids surprises and safeguards the warranty.
• Reserve the right equipment and personnel, including spreader bars, toe jacks, machinery skates/rollers, insured riggers, and lockout/tagout supplies.

Height-reduction tactics (example)

Removing the Z-axis motor, top cover, and shipping skid/base runners drastically lowers the overall height for a lot of installations.
In the example given, technicians frequently report that a VMC650L can be lowered to about 2.2 meters in height by rolling the machine in on skates after removing the bottom skid and the Z-axis motor/cover. (The precise figures differ depending on the builder; check for your machine.)

Rolling in

• Protect ways and cablesbefore any top removal. Cap connectors; photograph everything.
• Balance the load:keep CG between skates; move slowly; use tag lines; never put limbs under the chassis.
• Keep level transitions gentle:use steel plates/ramps at thresholds.

Reassembly & recommissioning checklist

If necessary, replace the gaskets and reinstall the Z-motor/cover, making sure the torque is applied in accordance with the guidelines.
Check the motor phasing and encoder orientation after reconnecting and rearranging the cables.
Square the spindle after leveling the machine (twist and pitch). If necessary, perform the ballscrew/axis lube purge and adjust the tool changer alignment.
Check the geometry using the spindle tram, test bar sweep, circular interpolation test, and short cutting trial.
Note any variations from the typical installation as well as the height as-left.

Conclusion

Both issues are prevalent and solvable. A valid and common way to achieve center height is to shim a lathe tool. Keep stacks thin, use the right shim stock, and make sure everything is centered. It takes careful planning and rigging, not a lot of guesswork, to fit a VMC through a low door. Reduce the height using builder-approved removals (some VMC650L units have a Z-motor and skid down to about 2.2 m), roll it in safely, and recommission the machine to its original condition. When carefully implemented, these practical solutions guarantee that production can proceed without sacrificing accuracy or safety.

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Tags: Lathes, VMC Machine