page 110

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Blake Co-Ax center locating indicator
contact points and
spare parts list

 

SPI Co-Ax (made in USA) and Blake Co-Ax are identical. Also known as Co-Axial indicators. Be sure that you have purchased the genuine made-in-USA Co-Ax and not a Chinese imitation (if they cost under $250 they're definitely Chinese). There is absolutely no reason to believe that Blake parts will function in the Chinese gages.

blakecoaxindica

To order new instruments and for information on the Blake Co-Ax indicator (shown above), go to page 5. If you'd rather have us service your indicator, please see page 30.

 

  • The following contact points can be ordered online by clicking the ordering number shown.
  • For complete and professional repair service refer to page 30.
  • Other spare parts are not available for sale from us.
  • The schematic parts breakdown above is provided for reference purposes only.
     

Ordering no.

Accessory and Replacement Feelers

Price USD

801

Co-Ax indicator, complete set (inch)

379.00

801-M

Co-Ax indicator, complete set (metric)

379.00

851

1.8" long straight Standard feeler: max Ø 4.25"

21.00

852

1.8" long curved Standard feeler: max Ø 4.25"

21.00

851-C2

1.8" long straight carbide feeler: max Ø 4.25"

48.00

852-C2

1.8" long curved carbide feeler: max Ø 4.25"

51.00

MTC72-15

2" long straight feeler with small 1/16" ball (exclusive)

49.00

851-3

3" long straight feeler: max Ø 6"

34.00

852-3

3" long curved feeler: max Ø 6"

36.00

851-4

4" long straight feeler: max Ø 8"

35.00

852-4

4" long curved feeler: max Ø 8"

40.00

851-C4

4" long straight carbide feeler: max Ø 8" (exclusive)

50.00

852-C4

4" long curved carbide feeler: max Ø 8" (exclusive)

50.00

851-5

5" long straight feeler: max Ø 10"

39.00

852-5

5" long curved feeler: max Ø 10"

43.00

851-6

6" long straight feeler: max Ø 12"

39.00

852-6

6" long curved feeler: max Ø 12"

45.00

851-7

7" long straight feeler: max Ø 14" (carbide ball) exclusive

44.00

852-7

7" long curved feeler: max Ø 14" (carbide ball) exclusive

55.00

851-9

9" long straight feeler: max Ø 18" (see notes below) exclusive

85.00

851-10

10" long straight feeler: max Ø 20" (see notes below) exclusive

95.00

Feelers

 

Straight feelers are used for inside diameters and curved feelers are used for outside diameters. They are easy to interchange. The maximum measurable diameter is twice the length of the feeler (with the exception of the standard feeler which will indicate a maximum diameter of 4.25 inches). Thus, a 3" long feeler can indicate a diameter of 6 inches, etc.

The 9" and 10" long feeler is suitable for working with tire rims indicating a maximum diameter of 18 or 20 inches. The manufacturer does not make this size feeler, so we have had them custom made. The manufacturer advises us that the gage should work correctly even with this size feeler extra long installed. However, we can not take any responsibility for the function of the indicator when non-standard feelers are used.

Standard ball diameters on these feelers is 1/8" steel. These are also available in carbide for certain lengths. Additionally, we have a 2" long feeler with a small 1/16" diameter steel ball. See the parts list above.

 

Repair Notes

 

Parts for the movement are not sold separately. It will be necessary to buy the entire movement #825.

Co-Ax body #803 comes with the bushings installed but it requires special fixtures for proper assembly and do-it-yourself repairs are strongly discouraged.

Shaft #841 is different in inch and metric Co-Ax indicators. It's the top, short end of the shaft diameter that is measured. The long end is the same for both types.

Pin #846 is a press fit into rocker #844. It will slide easily through the shaft. Choose two spacers of an appropriate thickness to eliminate side play. When tapping the pin into place take care not to bend shaft #841. Use some form of support to prevent damage. The straightness of this shaft is the critical element in the Co-Ax indicator's function. Two spacers will also be used under screw #863 and nut #864 to eliminate side play in that location.

The glass crystal #834 is .020" larger in diameter on the new models (1.465"). If you're trying to fit it into an old model, use a diamond file to modify it. The alternative is to replace the old bezel with a new style bezel so that the crystal fits. Old style crystals are not available.

The new style bezel #826 easily replaces the old style. It will, however, need the new crystal #834 (see note above).

Spacer #847 is used to eliminate sideways play. Trial and error will tell you which size to use, although we find that .004" is the most common in our repairs.

If you would rather have us repair these co-axial indicators for you, please refer to page 30.

Be aware that cheap Asian imitations also exist. There is no guarantee that these original Blake parts would work on the Chinese indicators.


 


Aerospace Axis Offset Indicator
 

For a fraction of the price of a new Blake Co-Ax Indicator you can buy this Chinese import sold under the brand name "Aerospace". It is actually surprisingly well built. We don't advocate buying Chinese when an American option exists, but perhaps you have a good reason to support the Chinese economy. Just don't complain about jobs going overseas.


 

 

LONG ISLAND INDICATOR REPAIR MANUALS

BesTest and TesaTast Indicator Repair Manual … page 177
Starrett 711 Last Word Indicator Repair Manual … page 199
Interapid Indicator Repair Manual … page 208
Compac Test Indicator Repair Manual … page 194
Mitutoyo Test Indicator Repair Manual … page 102
 

www.longislandindicator.com

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


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This page's most recent revision: 19 OCTOBER 2017
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Original photographs and content copyright 2017 by JWGrum

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