page 183

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Long Island Indicator Service Inc

Precision Tool Repairs, Sales & Spare Parts

swiss rox!

FREE CRYSTAL REPLACEMENT

with every Swiss made test indicator purchased from us you will receive a coupon good for one free crystal replacement - for any reason - at any time. Just present the coupon along with return shipping cost
and we'll take care of the rest.

The best value for your money...

Genuine Swiss indicators!

Graduations

Total
range

Compac no.

Dial Ø

Contact point length

Order No.

2009 List

Sale price

.0005"

.030"

244A

1.06"

.68"

27742

129.00

109.00

.0005"

.030"

244GA

1.58"

.68"

27743

142.00

119.00

.0005"

.020"

244LA

1.06"

1.80"

27745

185.00

149.00

.0005"

.020"

244GLA

1.58"

1.80"

27744

199.00

159.00

.0001"

.008"

245A

1.06"

.72"

27747

148.00

139.00

.0001"

.008"

245GA

1.58"

.72"

27749

161.00

159.00

.00005"

.008"

**

1.58"

.72"

20-055-0

**

199.00

** For a number of years, Compac made a special model test indicator for SPI. The .00005" dial had the SPI name printed on it. It is nothing more than a .0001" dial on which the graduations have been subdivided. SPI stopped carrying this model in favor of cheap Chinese imports, but we still have access to it from the manufacturer. Ordering number 20-055-0 will give you the genuine Swiss made Compac indicator, albeit with the SPI name on the dial, while supply lasts.

A schematic drawing is available showing indicator dimensions. Two stem attachments T4 (5/32" equivalent to 4 mm) and T8 (8mm) are included. For tolerances see below. Model 20-055-0 has the same tolerances and specifications as model 245GA

Metric models can be found on page 108.

Free crystal replacement

Crystals get scratched, discolor or crack for one reason or another, but here's good news: if you bought the Compac test indicator from us, we'll give you a coupon good for a one time crystal replacement. Here are the details:

• It's a Compac test indicator
• You bought it from Long Island Indicator Service and can prove it
• We'll replace the crystal one time
• For as long as you own the gage
• At no cost except shipping and handling

Black dial - yellow dial - white dial

Compac model 244BF and other black dial models have been discontinued. It had a black dial and orange hand like the more popular Bestest indicators. Long Island Indicator has replacement dials and hands for some of these models, and because all other parts are identical to the standard white dial models these indicators will remain serviceable for years to come.

Yellow dials are the standard for metric gages in the USA. While most new metric Compac indicators are shipped with white dials, yellow dials can be purchased and installed.

Important calibration information

Compac models are designed to permit a true reading when the angle between the stylus and the reference surface is 0° (ie., they are parallel).

Since the dial test indicator is used as a comparator, the angle can usually be set to remain at 0° for all comparisons. However, when the indicator is run through its range while attempting direct readings or for calibration, this angle will of necessity change, introducing the cosine error.

In the rare cases when measurement is required with the stylus at an angle other than 0° with respect to the reference surface the readings should be corrected. Refer to calibration instructions on gage 7 for details.

All new Compac test indicators come with a calibration certificate from the manufacturer, but they are not NIST traceable. If you need an NIST calibration cert, please specify at time of ordering. We will provide these certs free of charge for Series 240 (see details above).

While Compac test indicators are accurate ± 1 graduation when used as a comparator, they have total allowable deviations over their entire range as follows:

Model

total range

dial configuration

total deviation

hysteresis

repeatability

measuring force

244A/244GA

.030"

0-15-0

.0005"

.00015"

.0001"

0.25N

244LA/244GLA

.020"

0-10-0

.0005"

.00015"

.00015"

0.10N

245A/245GA

.008"

0-4-0

.00015"

.00015"

.00006"

0.25N

Source: Tesa SA, July 2005

Contact point length

It is imperative that the correct length of contact point be used with dial test indicators. Test indicators rely on leverage ratios to amplify the readings. Changing the length of the contact point will alter the ratio and result in incorrect readings. The common problem of incremental errors (ie, the readings gradually get worse from one revolution to the next) is most likely due to the installation of the wrong length point.

Most manufacturers specify the proper point length in their catalogs. It is not always clear, however, how the over-all length of the point is measured.

Compac contact points should be measured from the center of the carbide ball to the far end of the threads.

Some end-users purposely install extra-long contact points because their application requires it. If the contact point is exactly twice the length, then the readings on the dial will be doubled. Most .0001" Compac indicators can be fitted with a long point which will make the graduations read .0002"

Most manufacturers make indicators designed for use with long contact points. Compac test indicators have the letter designation "L" as a component of their model numbers.

Contact points can have a variety of ball diameters typically ranging from .015" to .120" and are available in carbide or ruby (special order). It is highly recommended that contact points fitted with carbide balls be used, especially for .0001" indicators. The size of the ball diameter has no effect on the indicator's accuracy.

To find the ordering number for contact points refer to the contact points list shown on page 21.

Compac indicator repair service

All parts are available and with 40 years of experience repairs can effectively be made on any of these indicators.

It's our policy to replace any damaged or worn parts necessary for the full function of the indicator. This way you'll be sure to get an instrument that's as good as new and one you can rely on. If you use a credit card for payment, turn-around is less than one week. For full details regarding repairs of Compac as well as other brands of indicators, please refer to page 30.

Also, if you buy the indicator from us, you'll get a coupon good for one free crystal replacement when it gets damaged - for whatever reason.

Plus, if you request it, we'll provide you with a short-form certificate of calibration free with every indicator repair. After all, when your instrument comes back, you need to know that it's accurate.

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Long Island Indicator Service Inc
14 Sarah Drive — Hauppauge NY 11788 — USA
 

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