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Compac
High Quality Metric Dial Test Indicator

 

 

In the 1950-60's Compac of Geneva, Switzerland, manufactured the best selling indicator and dial bore gage imports in the United States. These models were sold with the name Alina. They were so well built and such favorites of machinists of the time that, even today, we receive these indicators for repair. In Europe the indicators were sold with the name Parvus. In a misguided effort to build a sturdier gage, the manufacturer changed the models to klunkers that had all the grace of a bread box. These were the short lived IXL series.

Just a few years later, they introduced the current Compac models. They have had minor changes in the past 10 years but nothing that affected the over-all look or performance. The Compac indicator is designed to last: sturdier than the Bestest and less costly than the Interapid. It fits perfectly in-between. They are also marketed in the UK with the name Mercer, and in the USA with the name SPI.

Tesa of Renens, Switzerland, is the current manufacturer of Compac indicators as well as Bestest, Tesatast and Interapid indicators.

 

 

Horizontal Short Range - Single Revolution

 

Compac 0.002 mm Model 245G (front) and Model 245 (back) with two stem attachments. The standard contact point has 2 mm Ø carbide ball.

A schematic drawing is available showing indicator dimensions. Two stem attachments T4 (4 mm) and T8 (8 mm) are included. For tolerances see bottom of this page.

 

Graduations

Total range

Compac number

Dial Ø

Contact point length

Order no.

List price

Your price USD

0.01 mm

0.8 mm

242

27 mm

18 mm

27738

123.00

119.00

0.01

0.8

242G

40

18 mm

27739

136.00

129.00

0.01

0.5

243GL

40

45 mm

27740

190.00

189.00

0.01

0.5

243L

27

45 mm

27741

177.00

169.00

0.002

0.2

245

27

18 mm

27746

142.00

139.00

0.002

0.2

245G

40

18 mm

27748

154.00

149.00

Extra small carbide contact point Ø 0.8 mm
(select appropriate length)

18 mm

20596

25.00

19.50

45 mm

20597

25.00

19.50

 

You may order online by selecting any linked model number.

 

 

Horizontal Long Range - Multiple Revolutions

 

These Swiss made indicators are unique with their extended range. Ideally suited for long run-outs or centering where more leeway is needed. Stem attachments T4 (4 mm) and T8 (8 mm) are included. Other sizes are available. The carbide contact point is 2 mm diameter.

Compac model 215GL with 0.002 mm graduations

A schematic drawing is available showing indicator dimensions. For tolerances, see bottom of page.

 

Graduations

Total range

Model no.

Dial diameter

Contact point length

Order no.

List price

Your price USD

0,01mm

1,5mm

213

27mm

18mm

27703

164.00

159.00

0,01mm

1,5mm

213G

40mm

18mm

27704

182.00

179.00

0,01mm

3,0mm

212L

27mm

36mm

27702

242.00

239.00

0,01mm

3,0mm

212GL

40mm

36mm

27701

256.00

249.00

0,002mm

0,6mm

215

27mm

18mm

27709

208.00

199.00

0,002mm

0,6mm

215G

40mm

18mm

27711

223.00

219.00

0,002mm

1,2mm

215GL

40mm

36mm

28011

272.00

269.00

0,001mm

0,6mm

216G

40mm

18mm

28008

218.00

209.00

 

You may order online by selecting any linked model number.

 

 

Vertical Long Range - Multiple Revolutions

 

These rugged Swiss made indicators are unique with their extended range. Ideally suited for jig-bore work, for long run-outs or centering where more leeway is needed. Stem attachment T4 (4 mm) is included. Any standard dovetail holders or attachments will fit. Centering holder SCP and SCPA (see below) are specifically designed to hold this indicator in its vertical position. The carbide contact point included is 2 mm in diameter.

Compac model 223 (left) and model 222GL with long point (right).

A schematic drawing is available showing indicator dimensions. For tolerances, see bottom of page.

 

Graduations

Total range

Model no.

Dial diameter

Contact point length

Order no.

List price

Your price USD

0,01mm

1,5mm

223

27mm

18mm

27716

204.00

199.00

0,01mm

1,5mm

223G

40mm

18mm

27717

218.00

209.00

0,01mm

3,0mm

222L

27mm

36mm

27715

278.00

269.00

0,01mm

3,0mm

222GL

40mm

36mm

27714

297.00

289.00

0,002mm

0,6mm

225

27mm

18mm

27722

253.00

249.00

0,002mm

0,6mm

225G

40mm

18mm

27724

267.00

259.00

 

You may order online by selecting any linked model number.

 

 

Parallel Long Range - Multiple Revolutions

 

Compac model 232L shown above, with two stem attachments and box. This parallel type has a short dovetail on the far end, and a long dovetail along the under side (not seen). These parallel models are rarely in stock and require up to 4 weeks for delivery.

A schematic drawing is available showing indicator dimensions. Stem attachments T4 (4 mm) and T8 (8 mm) are included. For tolerances see bottom of this page.

 

Graduations

Total range

Model no.

Dial diameter

Contact point length

Order no.

List price

Your price USD

0,01mm

1,5mm

233

27mm

18mm

27728

238.00

229.00

0,01mm

1,5mm

233G

40mm

18mm

27729

253.00

249.00

0,01mm

3,0mm

232L

27mm

36mm

27727

316.00

309.00

0,01mm

3,0mm

232GL

40mm

36mm

27726

328.00

319.00

0,002mm

0,6mm

235

27mm

18mm

27734

275.00

269.00

0,002mm

0,6mm

235G

40mm

18mm

27736

291.00

289.00

 

You may order online by selecting any linked model number.

 

 

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 for details.

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

213/213G

1.5 mm

0-25-50

.013mm

.003mm

.003mm

0.35N

223/223G

1.5 mm

0-25-50

.013mm

.003mm

.003mm

0.35N

233/233G

1.5 mm

0-25-50

.013mm

.003mm

.003mm

0.35N

212L/212GL

3 mm

0-50-100

.026mm

.006mm

.003mm

0.20N

222L/222GL

3 mm

0-50-100

.026mm

.006mm

.003mm

0.20N

232L/232GL

3 mm

0-50-100

.026mm

.006mm

.003mm

0.20N

215/215G

0.6 mm

0-5-10

.013mm

.0025mm

.0015mm

0.30N

225/225G

0.6 mm

0-5-10

.013mm

.0025mm

.0015mm

0.30N

235/235G

0.6 mm

0-5-10

.013mm

.0025mm

.0015mm

0.30N

242/242G

0.8 mm

0-40-0

.013mm

.003mm

.003mm

0.25N

243L/243GL

0.5 mm

0-25-0

.013mm

.0035mm

.003mm

0.10N

245/245G

0.2 mm

0-10-0

.004mm

.002mm

.0015mm

0.25N

 

Source: Tesa SA, July 2003

Compac Indicator Repair

 

Who would buy a Rolls Royce if repairs weren't possible? Not to worry, Compac spare parts are available, in stock, and, with 50 years of experience, repairs can effectively be made on any of these Compac indicators.

For details, please refer to page 30.

 

 

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 0,002 mm Compac indicators can be fitted with a long point which will make the graduations read 0,004 mm

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 1 mm to 3 mm and are available in carbide or ruby (special order). It is highly recommended that contact points fitted with carbide balls be used, especially for 0,002 mm 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 on page 21.

 

 

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This page's most recent revision: 11 June 2008
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