Tesa Veribor Light
Swiss made dial bore gauge: metric and inch

Complete set from .7" to 6" includes two separate measuring heads and two sets of plugs. Each plug can be used for inch or metric readings, making this very versatile.

Newly introduced from Switzerland, "Tesa Veribor Light is a mechanical two-point bore gauge made for comparative measurements of bores along with their form errors." —sales literature

This self-centering tool can be used with a dial indicators, precision comparator indicators, electrical or digital probes. The bore gage will accept both 8 mm and 3/8" diameter stems. This major feature sets this bore gage apart from all others. You can use any dial indicator, right off the shelf, even indicators which you may already own. No special housing is required. By using indicators reading in .0001" or 0.002 mm you will have a bore gage that measures both metric and inch.

By all means, use the best indicators or probes you can afford and make sure they're in top working condition and have been calibrated. Putting an inferior gage on this Veribor isn't going to help you get good repeatability or accuracy.

The manufacturer points out that "all Veribor Light bore gauges should only be used within their application range as well as in the ambient conditions that are specified for measuring bore diameters by comparison. They are neither suitable for absolute measurements nor for the measurement of polygon shaped bores."

Memorize the above paragraph! This isn't new information, but something that applies to all bore gages and we often wish we could ignore.

The interchangeable measuring extensions are labeled in inches and millimeters so that the set can easily be used in either environment.

Range

Order Number

List Price

Introductory Price

.7" to 1.4"
18 mm to 35 mm

05790090

418.00

369.00

1.4" to 2.5"
35 mm to 63 mm

05790091

408.00

359.00

2" to 6"
50 mm to 152 mm

05790092

470.00

419.00

.7" to 6"
18 mm to 152 mm

05790093

797.00

709.00

About the optional dial indicator

The bore gauge price does not include a dial indicator. We are told that any dial indicator with an 8 mm or 3/8" diameter stem can be used. The Mercer indicators are an excellent choice made by the same manufacturer, and can be highly recommended. Select any Mercer indicator, large dial or small dial, any graduation on page 170, or use the dial indicator you already own. A great money saver.

Bore gage with continuous dial shown as an example.

Here's what we recommend for any of the above bore gages:

• Mercer .0001" balanced dial indicator 01426028 ... $329.00
• Mercer 0.002 balanced dial indicator 01416034 ... $329.00

These top-quality Swiss-made Mercer indicators have a balanced dial which is ideal for the bore gage since you want to be able to read deviations from zero, in either the plus or minus direction. Of course, a continuous dial would also do the trick as long as you remember what the object of the exercise is: you are not taking direct measurements, you are comparing (but, you've already memorized this).

What is the measuring depth?

From the measuring plunger up to the base of the handle (dimension B) is 7 inches. You may also decide to insert the handle and then the overall length is 10 inches. This will leave only the indicator exposed and is probably awkward, but it could be done.

Depth extension (dimension B on drawing, above)

Other depth extensions (250 mm, 500 mm, 750 mm, 1000 mm) are available for those gages that have measuring ranges of 25 mm to 550 mm. They will not fit onto the smaller - less than 25 mm - measuring heads. Delivery on these items is likely to be 4 weeks, so plan ahead.

• 250 mm (10 inches) ... 57.60026 ... $ 616.00
• 500 mm (20 inches) ... 57.60027 ... $ 691.00
• 750 mm (30 inches) ... 57.60028 ... $ 804.00
• 1000 mm (40 inches)... 57.60029 ... $ 867.00

Why does it look so much like a Mitutoyo?

The measuring head has a movable centering device (the two "wheels"). On the left is the interchangable measuring insert and on the right is the measuring plunger.

It has a superficial resemblance to the Mitutoyo dial bore gage because Mitutoyo copied the original Etalon design of the 1950's, and so did several others. Etalon eventually stopped making it in favor of the Compac dial bore gage. Unfortunately the Compac gage has become very expensive so Tesa—wisely—decided to create this modified version and we think they've got a winner this time.

Bore Gauge Components

Figure 1 shows the completed bore gage using your indicator (1) held by the clamping shaft (2) onto the body and handle (3). The measuring head (4) completes the ensemble.

Figure 2 shows the components of the measuring head (4) and the use of the centering device (5), measuring extension (6), the washers (7), the measuring inserts and the cap (8) which is used to tighten everything in place.

Replacement washers (spacers) part 7 as shown above:

• spacer 1 mm 023284 ... see price list on page 151
• spacer 2 mm 023285 ... see price list on page 151
• spacer 3 mm 023286 ... see price list on page 151

Repairs

We should be able to perform any necessary repairs including warranty repairs if that comes up. Although spare parts are not generally in stock, the manufacturer assures us that they will be available.

Drawbacks

Every item, even the finest, has a weak link. This bore gage is too new to have been evaluated. We haven't had any on our repair benches so we don't yet know what the weak link might be.

A few issues exist: We notice that there is no chart which explains which washers and extensions to use in combination to get certain dimensions. It looks like the users have to figure that out on their own. The bore gage ships in a very good wooden, hinged box so you can keep all the extensions in place, but you won't be able to store your bore gage once the indicator is attached. You'd always have to dismantle for storage and this requires a hex wrench. The wrench is included but we can imagine you'll misplace it in no time.

If these are the only drawbacks evident at this early stage in sales, then we're pretty well off.

Important Safety Notice

Do not use this or any bore gage on running machines. Make certain everything has come to a complete stop before taking a measurement.

Some wording on this page is borrowed and/or paraphrased from the instruction and sales literature which Tesa has provided with this bore gage. Editorial comments and opinions are, as always, our own. We stand to be corrected.

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This page's most recent revision: 11 March 2008
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