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Interapid test indicator
spare parts - repair parts

 

 

Note: the drawings above are for the Interapid .0001" horizontal models. The parts for the .0005" indicator and the vertical models may have a slightly different appearance. Order parts for all models from the list below.

Test indicators with .001" graduations such as model 312B-20 and 312B-20V will take the same parts as the .0005" indicators.

Model 312B-15 and 312B-15V will take the same movement parts as the other .0001" models. The return lever is different and unique. Check the parts list carefully if ordering for these.

Professional repair service is available from Long Island Indicator if you'd rather have us take a look. See page 30 for details.

There is a $90 minimum order when using a formal purchase order. If the value of your PO is less than $90, then please place your order online by clicking the appropriate part numbers below. Purchase Orders can be emailed to us.

0

plastic box for 312B-15 and 312B-15V models

106461

0

plastic insert for 106461

112324

0

plastic storage box (not suitable for 312B-15 or 312B-15V)

111473

18.80

1

body 312B-1, 312B-2, 312B-20

111360

145.00

1

body 312B-3, 312B-4, 312B-15

111361

145.00

1

body 312B-1V, 312B-2V, 312B-20V

107480

145.00

1

body 312B-3V, 312B-4V, 312B-15V

111949

3

outer dial 0-40-0 (1.5" diameter)

026420

3

outer dial 0-10-0 (1.5" diameter)

026421

3

outer dial 0-15-0 (1.5" diameter)

026422

3

outer dial 0-4-0 (1.5" diameter)

026423

16.80

3

outer dial 0-10-0 (1" diameter)

026425

3

outer dial 0-15-0 (1" diameter) .0005"

026426

3

outer dial 0-15-0 (1" diameter) .001"

026428

4

screw for dial (see note below)

105912

13.10

5

hand, revolution counter

108205

21.00

6

hand for 1" dial

108045

23.00

6

hand for 1.5" dial

item5

108046

23.00

7

contact lever .0001” (see notes)

110547

7

contact lever .0005” (see notes)

110614

8

rack lever .0001”

110518

24.00

8

rack lever .0005”

110610

23.50

9

return lever .0001”

123083

9

return lever .0005”

123084

9

return lever for 312B-15 and 312B-15V

123101

10

ball bearing with spanner nut

109941

18.60

11

spanner nut (see notes)

123073

1.90

12

carbide contact points see page 21

13

pivot

105925

27.00

14

screw for dovetail

106289

15

dovetail large

106288

16

dovetail small

106287

17

screw, travel limit

111326

18

stem attachment screw (A) see notes below

111318

11.90

19

stem attachment nylon (B) see notes below

111319

11.80

20

stem attachment ø 4 mm (C) see notes below

111317

22.50

8 mm adapter (fits over 4mm stem) #74.108942

108942

3/8” adapter (fits over 4mm stem) #74.108943

108943

21

stem attachment washer (D) see notes below

106034

1.20

22

stem attachment bushing (E) see notes below

110666

13.60

23

screw attaches movement to body from the back

105908

1.40

24

bezel with crystal installed (1”) for models ending -2 -20 -4 -2V -20V

123079

25.50

24

bezel with crystal installed (1.5”) for models ending -1 -3 -15 -1V -3V -15V

123080

29.00

24

bezel only, small (1”)

110477

24

bezel only, large (1.5”)

110479

25

crystal, small bezel size 1” (see note below)

105967

14.10

25

crystal, large bezel size 1.5” (plastic Ø 36.0 mm convex) see notes

105968

14.40

27

extension ring for large bezel

110300

28

complete movement for B-1, B-2, B-20, B-1V, B-20V, B-2V

111904

143.00

28

complete movement for B-3, B-4, B-3V

111905

144.00

28

complete movement for B-15 and B-15V

026077

29

contact point wrench (18.60307)

01860307

30

dial 312-1 insert

026403

30

dial 312-3 insert

026404

30

dial 312B-1 insert (use with dial ring 026422)

026409

16.80

30

dial 312B-3 insert

026410

16.80

30

dial 312B-2 insert

026411

30

dial 312B-20 insert

026413

30

dial 312B-3v insert

026414

19.80

30

dial 312B-1v insert

026415

30

dial 312B-2v insert

026416

30

dial 312B-15 insert

026418

30

dial 312B-15v insert

026419

30

upper movement plate (top plate with bearings) 0,002 mm .0001"

132093

30

upper movement plate (top plate with bearings) 0,01 mm .0005"

132085

31

center pinion for 312-1, 312-2, 312-1V and 312-2V

123089

15.40

31

center pinion for 312B-1, 312B-2, 312B-20, 312B-1V, 312B-2V, 312B-20V

123089

15.40

31

center pinion for 312-3, 312-4, 312B-3, 312B-4 and 312B-3V

123097

15.60

31

center pinion for 312B-15 and 312B-15V

123097

15.60

32

bearing .0005” bottom

123088

13.70

32

jewel .0001” bottom

123096

13.10

33

hair spring gear .0005”

123091

15.40

33

hair spring gear .0001”

123099

15.00

31

hair spring gear for 312B-15 and 312B-15V (see notes)

123099

15.00

34

spring washer (bezel friction spring)

123082

14.80

35

lower movement plate for .0005" and .001" models

123086

53.00

35

lower movement plate for .0001" and 312B-15 and 312B-15V

123094

36

bearing .0005” top

123090

12.20

36

jewel .0001” top

123098

37

pin for hair spring

123078

2.10

38

screw for bridge (bearing plate fix screw P43)

123076

2.80

40

crown gear for 312-1, 312-2, 312-1V and 312-2V

123087

25.00

40

crown gear for 312B-1, 312B-2, 312B-20, 312B-1V, 312B-2V, 312B-20V

123087

25.00

40

crown gear for 312-3, 312-4, 312B-3, 312B-4 and 312B-3V

123095

24.00

40

crown gear for 312B-15 and 312B-15V

123095

24.00

41

mounting ring with threads (bezel attaching inner ring)

123081

15.20

42

hair spring .0005”

123092

19.80

42

hair spring .0001”

123100

22.00

42

hair spring for 312B-15 and 312B-15v

123242

17.40

43

screw for crown gear

123075

11.90

44

crown gear bearing

123074

14.60

pointinghandvintageimagegraphicsfairy2a
You can place an online order by clicking any linked part number where a price is shown.

Notes

 

A selection of repair tools used by professionals for assembling the Interapid indicator are shown on page 31.

Dials: Up until recently, these dials were made of metal. Nice sturdy things, cleanly printed. New models (since 2014) have replaced these with a bright white plastic dial, still nicely printed. They are a bit thinner. But be careful: cleaning solvents may affect the plastic. Naphtha does not dissolve the plastic, but it will cause the plastic to warp if you don't dry it off promptly. Better to use a water-based cleaner if you need to soak the dials.

Screw for dial: under some conditions these little screws have an annoying habit of unscrewing themselves as a result of vibrations. Don't take it personally if this happens to you. We suggest you tighten the screws on a regular basis—perhaps each time you calibrate the indicator—so that they won't fall out and jam up the works. It's a little bit like tightening those screws on your eyeglass frames, before they fall out—probably while you're on vacation somewhere. (The manufacturer solved this problem in new models made in 2014 by simply gluing these small dial screws in place. This can make it very hard to remove them during a repair. We suggest NOT trying to remove them if the movement does not need to be disassembled.)

Horseshoe Clips used on the old Interapid 310 and 311 series indicators can be purchased from Mr. Wayne Root who has manufactured a supply of these. They are available on E-Bay by clicking here.

FYI: Ball Bearing tap size M4x0.35

Up and down pressure on the contact point should be about even. This is the function of the return lever (drawing #9) and the shape of the spring. For ideal performance, the shape of this spring should mimic that of a brand new part. Often times, this spring gets bent out of shape when it is removed during a repair attempt.

IMG1235 IMG1237

Part 123083 (left) for .0001" indicators, part 123084 (right) for .0005" indicators showing ideal spring shapes.

Crystal replacement: Interapid crystals are not user replaceable. They require a crystal press for insertion. The crystals are flat or just slightly convex, slightly over-sized and must be inserted with a crystal press. The crystal press will make them dome-shaped and this is what keeps the crystals in place. You can opt to purchase the bezel with crystal already installed (see parts list above) so that you simply remove the old bezel and screw on the new bezel with the new crystal, or you can send us the indicator with instructions to replace the crystal only. The cost is $30.

Removing the bezel: The bezel is threaded and unscrews. Hold the lower bezel plate steady with a small screw driver or pin, placed in one of the two holes, while you unscrew the bezel (see details below).

Stem attachment: If the mounting stem is bent or broken you can replace it with a bit of care. When you remove the old stem, don't lose the other parts. Unscrew A (#18), remove B (#19), tap out the bushing E (#22), save the washer D (#21) which goes on the inside, then remove stem C (#20). Reassemble in reverse order.

 

oldsytlestem
Be advised that we only sell the new style stem attachment. Old style stem attachments, pre-1965, are no longer available.

The old style, shown in the photo to the left, had an adjusting screw built into the stem and had a large diameter chrome pin running through the sides. It did not have the components shown in the drawing above.

It will not be possible to install the new style stem into the old model bodies.

 

 

IMG1205item6

Contact lever 110547 installed on the .0001" pivot (left) and contact lever 110614 installed on the .0005" pivot (right). When replacing, be sure you do not install it backwards. The pivot and the contact point are not included when ordering this part.
 


 

How to tighten a loose bezel

bezeltightening
The bezel is screwed on as you have probably noticed.

Take a look under the rim and you will see two holes. Insert a rod, a pin, a screw driver, something small into one of the holes. This will keep the plate from rotating while you turn the bezel and now you can tighten it again, by hand.

If you have the small diameter bezel, there won't be any holes but there will be two slots (you can also see this slot in the enclosed photo). The slots serve the same purpose for the small diameter indicators (but not for the large diameter).

 


Hair spring and gear assembly

IMG1325
This photo shows the correct hair spring placement on its gear. The spring will wind clock-wise. It is press fit onto the longer of the shafts. Already pre-assembled hair springs and gears are available from the list above. Note that there are 3 different hair springs to choose from depending on the Interapid model.

Spanner nut and ball bearing

spannernuts
There are two different sides to the spanner nut and this photo shows the correct placement. The one on the left is correct, but the one on the right is installed upside-down. The circular ridge should be facing down.

Special spanner wrenches make the work easy, but these are not available. For best results, use needle nose pliers and a screw driver that fits the slot perfectly.

A note about the -15 and -15V model hair springs

These indicators use a unique hair spring to counter blance the weight of the extra long contact point. The crown gear pre-load should be 3/4 of a turn. Even then, you may encounter some slight jumpiness in the dial hand, especially when compared to the standard models. We have not found a good way to avoid this. You will also see that repeatability is less than ideal. You can count on about 1/2 graduation. Taking the length of the point into consideration, you can easily see why this would happen. Use these models only if you have no other option,

 

 

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14 Sarah Drive — Hauppauge NY 11788 — USA
 


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This page's most recent revision: 23 AUGUST 2015
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Photographs and content copyright 2015 by JWGrum
 

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