Precision granite parts

Granitgewindeeinsatz Threaded inserts are glued into the granite. The threaded inserts are set back approximately 0.5 mm below the surface. Granitplatte Granite components can be manufactured in very large sizes. To reduce weight, a sandwich construction is possible.

Granite - A modern material for high-precision components

High-precision components can be ideally made ​​of granite. The reasons for this are primarily the extremely good properties of this material.

Granite is by its fine crystalline structure, low expansion coefficient, high wear resistance, optimum vibration damping, and freedom from unwanted stresses the optimal basis for the manufacture of precision products.

In the processing of hard rock you can reach a very fine surface quality. This granite components are particularly suitable for air-bearing guides. Here, the air consumption due to the high surface quality is kept to a minimum.

The use of granite is worthwhile in any case, whenever the quantities of components, such as machine beds or high-precision base plates for guidance bar, are relatively small. If the number of units per year will be over 50, then one can consider the use of polymer concrete. For polymer concrete, we can also make you an offer. But keep in mind the high initial cost due to the production of the form.

Comparison of material properties of competing materials such as granite and concrete polymer or cast iron:

Property Unit Granite Polymer Concrete Steel Cast Iron
Density kg/dm³ 2,9 2,1 - 2,4 7,85 7,15
Flexural strength N/mm² 13 25 - 35 300 - 600 290
Compressive strength N/mm² 250 100 - 180 260 - 1200 720 - 1150
Length expansion µm/(m°K) 5 - 7 12 - 20 12 10
Thermal conductivity W/(m°K) 3,0 1,3 - 2,0 50 50
Specific heat capacity J/(kg°K) 845 900 - 1100 500 500
E-Modul kN/mm² 60 - 90 30 - 40 210 88 - 113

Table 1: Physical properties of various construction materials in engineering.

In addition to the shown properties in table 1, other advantages favor the use of hard rock:

  1. Vickers-hardness 850-900 (harder than steel)
  2. low linear expansion coefficient
  3. the specific weight is similar to that of aluminum
  4. the elasticity comparable to that of cast iron
  5. no burrs
  6. nonmagnetic
  7. without tension
  8. not electrically conductive


Granite measuring plates

Granite measuring plates serve as the basis for inspection, assembly and laboratory purposes. The plates are made from black hard rock (granite). The surface of the measuring plates is first finely ground and then lapped.

The sides of the measuring plates are ground clean. The flatness of measuring plates is classified according to DIN 876.

Dimensions (mm) Weight (kg) Contact Points DIN 876 / Quality 00 DIN 876 / Quality 0
Length Width Hight Number Distance (mm) Flatness (µ) Resilient (kg) Order Number and Link to the Shop Flatness (µ) Resilient (kg) Order Number and Link to the Shop
140 80 40 2 3 100/60 3 50 G-14-8-4-00 6 60 G-14-8-4-0
250 200 50 8 3 200/150 3 60 G-25-20-5-00 6 100 G-25-20-5-0
300 200 50 9,5 3 240/150 3 70 G-30-20-5-00 6 120 G-30-20-5-0
300 300 70 19 3 240/240 3 75 G-30-30-7-00 6 140 G-30-30-7-0
400 250 70 21 3 300/150 3 80 G-40-25-7-00 6 160 G-40-25-7-0
400 400 100 48 3 300/300 3 130 G-40-40-10-00 6 260 G-40-40-10-0
630 400 100 76 5 500/300 3 115 G-63-40-10-00 7 265 G-63-40-10-0
630 630 100 120 5 500/500 3 170 G-63-63-10-00 7 350 G-63-63-10-0
800 500 130 156 5 500/500 4 230 G-80-50-13-00 7 460 G-80-50-13-0
900 600 130 211 5 500/500 4 230 G-90-60-13-00 7 460 G-90-60-13-0
1000 630 150 284 5 700/500 4 160 G-100-63-15-00 8 320 G-100-63-15-0
1000 750 150 340 5 700/700 4 470 G-100-75-15-00 8 940 G-100-75-15-0
1000 1000 150 450 5 700/700 4 470 G-100-100-15-00 8 940 G-100-100-15-0
1200 800 150 432 5 700/500 5 560 G-120-80-15-00 9 930 G-120-80-15-0
1600 1000 200 960 5 1.000/700 5 580 G-160-100-20-00 10 950 G-160-100-20-0
2000 1000 250 1500 5 1.400/700 6 800 G-200-100-25-00 12 1.600 G-200-100-25-0
2000 1600 300 2880 5 1.400/1.000 6 2.050 G-200-160-30-00 12 4.100 G-200-160-30-0
2500 1600 300 3600 7 1.500/1.000 7 2.000 G-250-150-30-00 14 3.900 G-250-150-30-0
3000 2000 500 9000 7 1.800/1.400 8 3.400 G-300-200-50-00 16 5.450 G-300-200-50-0

Besselpunkte The bending of a uniformly loaded beam for different pairs of contact points: The blue curve shows the storage at the Bessel points. The vertical scale is greatly exaggerated.

Setting up a measuring plate

The flatness of measuring plates is only guaranteed with proper installation: Please proceed as follows:

  1. Place the measuring plate marked on the three contact points.
  2. Level the measuring plate by adjusting the three contact points (horizontal set).
  3. All other points are used only as a safeguard against tipping and be supplied only by hand.

All standard measurement plates from THOME Precision match the contact points of the Bessel contact points. About 22% from the edge of the contact points are the least deflection.



Messbalken in Box . Fig. S1: Granite bar in a wooden case. 2.000x200x120. One piece available. Messbalken aus Granit Fig. S3: Granite bar with holes. 5 pieces available with slight damage.runde Messplatte Fig. S4: Round granite table. Ideal for use as a round table top.

Special Offers

Measuring beams from hard rock after DIN 874:

Dimensions (mm) Weight (kg) Transport cross-hole Quality 00
Length Width Height Deviation (µm) Order no. Price
3.100 300 400 1.100 none 3 sides are parallel and flat with 5μm b25b01a 2.900€
990 100 200 40 2 times along 4 sides are parallel and flat with 4μm px65c01b-granit 200€

Round measuring plate made of granite. As a faceplate for a round table (see fig. S4):

Dimensions (mm) Weight (kg) Transport cross-hole Quality 00
Length Width Height Deviation (µm) Order no. Price
Diameter 600 40 35 M6 / 30x threaded holes Flatness 1 µm parallel 2µm t41aa01b 1.900€

All offers are subject to change. Intermediate sale is reserved. Plus transport and packaging.



Granitmessbalken Measuring bars of granite can also be porduced in very large sizes. According to the customer we can add holes and milled slots.

Measuring bars from hard rock according to DIN 874

The main focus lies on the parallelism of the longitudinal surfaces. The underlying standard is DIN 874 for parallelism.

Mainly measuring bars are used for control of straightness and parallelism of guidance and for alignment.

The measuring bars are designed as follows:

  • dark granite
  • the two narrow longitudinal surfaces are parallel lapped
  • all other surfaces are clean cut
  • at the Bessel support points are two handling holes
  • delivered in a wooden box

Dimensions (mm) Weight
(kg)
Transport cross-hole Quality 0 Quality 1
Length Width Hight Flatness (µ) Parall. (µ) Order no. Flatness (µ) Parall. (µ) Order no.
400 25 60 5 keine 6 12 G-40-6-2-0 10,6 21,2 G-40-6-2-1
630 35 100 6 keine 8,3 16 G-63-10-3-0 14,5 29 G-63-10-3-1
1.000 50 160 26 30 12 24 G-100-16-5-0 20,6 41,2 G-100-16-5-1
1.600 80 250 77 30 18 36 G-160-25-8-0 30,6 61,2 G-160-25-8-1
2.000 100 300 150 50 22 44 G-200-30-10-0 37,3 74,6 G-200-30-10-1
3.000 150 500 600 100 32 64 G-300-15-50-0 54 108 G-300-50-15-1

Table 3: Measuring bar made of granite according to DIN 874.

On request we can also produce higher accuracies. You can see here are just a sample of our delivery programme. Special requests like additional holes can be realised. We are also able to produce measuring bars with 4 longitudinal surfaces which are parallel. Please send us an e-mail with your requirements.

Send an enquiry for a measuring bar made of granite:
info@thome-praezision.de


Granitwinkel Quadratic angle standard made of granite have the advantage that they ensure the accuracy by their more symmetrical shape and are also thermally stable. Granitquadrat Rectangular angle standard made of granite. Ideal for checking geometries machines with long Z-strokes.

Granite in square shape and rectangular shape for review and adjustment of perpendicularity according to DIN 875

Hard rock angle standards are used primarily to control the 90-degree angle. The angle standard is ideal for rapid alignment of angularity (for example for measuring machines and machine tools). Four small surfaces of angle standard are parallel and perpendicular lapped.

The specification of the angular accuracy is related to the long leg. The two large surfaces are ground.

To reduce weight and for better handling through holes are inserted. If desired, threaded inserts for eye bolts can be placed.

The underlying standard is DIN 875 for perpendicularity. The package includes a wooden case and a test report.

Dimensions (mm) Weight (kg) Quality 00 Quality 0
Leg length Width Parall. (µ) Perpen. (µ) Order no. Parall. (µ) Perpen. (µ) Order no.
100 x 100 20 4 3,3 3 G-10-10-2-00 6 7 G-10-10-2-0
160 x 160 25 5 4,2 3,6 G-16-16-2-00 7,2 8,2 G-16-16-2-0
200 x 200 25 8 4,6 4 G-20-20-2-00 8 9 G-20-20-2-0
250 x 250 30 10 5,4 4,5 G-25-25-3-00 9 10 G-25-25-3-0
300 x 300 30 13 6 5 G-30-30-3-00 10 11 G-30-30-3-0
400 x 400 40 15 7,4 6 G-40-40-4-00 12 13 G-40-40-4-0
500 x 500 50 27 8,6 7 G-50-50-5-00 14 15 G-50-50-5-0
600 x 400 60 37 10/7,4 6 G-60-40-6-00 16/12 13 G-60-40-6-0
600 x 600 60 58 10 8 G-60-60-6-00 16 17 G-60-60-6-0
800 x 400 80 75 12,6/7,4 6 G-80-40-8-00 20/12 13 G-80-40-8-0
800 x 800 100 130 12,6 10 G-80-80-10-00 20 21 G-80-80-10-0
1.000 x 500 120 150 15,4/8,6 7 G-100-50-12-00 24/14 15 G-100-50-12-0
1.200 x 1.200 150 350 18 14 G-120-120-15-00 28 29 G-120-120-15-0

Table 4: Angle standard from hard rock 90 ° rectangle shape to DIN 875.

Send an enquiry:
info@thome-praezision.de



Granitwinkel Triangle angle standard made of granite.

Granite angle in triangle shape according to DIN 875

These granite angle standards are used for control of 90-degree angles.

They are made of dark granite. The two small legs are perpendicular to each other lapped surfaces, the remaining surfaces are sanded clean. The angular accuracy is related to the longer leg.

To reduce weight and better handling through holes areintroduced.

The underlying standard is DIN 875 for perpendicularity.

Supplied with a wooden case and a test report.

Dimensions (mm) Weight (kg) Quality 000 Quality 00
Leg length Width Flatness. (µ) Perpen. (µ) Order no. Flatness. (µ) Perpen. (µ) Order no.
400 x 250 50 8,5 1,5/1,0 1,5 DW4025 2,0/1,5 2,5 DW4025-00
500 x 300 60 15 1,5/1,0 2,0 DW5030 2,5/2,0 3,0 DW5030-00
600 x 400 70 28 1,5/1,5 2,0 DW6040 2,5/2,0 3,0 DW6040-00
800 x 600 90 69 2,0/1,5 2,5 DW8060 3,0/2,5 3,5 DW8060-00
1.000 x 600 120 130 2,0/1,5 3,0 DW10060 3,5/2,5 4,0 DW10060-00

Send an enquiry:
info@thome-praezision.de



Granitwürfel Granite cubes can be manufactured so that all six sides are perpendicular to each other at the edges. The opposing faces are parallel.

Cube of granite - ideal for fast testing of all geometries

These granite cubes are used as angle standards. The angle check is time-saving and highly accurate. Granite cubes are used in machine tools and for CMMs for rapid geometry testing.

The granite cubes are made of dark granite. All six sides are lapped perpendicular to each other, opposite sides are parallel. The angular accuracy is related to the longer leg.

To reduce weight and for better handling through holes can be inserted or threaded inserts can be placed. Just like you wish.

The underlying standard is DIN 875 for perpendicularity. The package includes a wooden case and a test report.


Dimensions (mm) Weight (kg) Transport cross-hole Quality 000 Quality 00
Length Width Hight Size Number Parall. (µ) Perpen. (µ) Order no. Parall. (µ) Perpen. (µ) Order no.
150 150 150 10 M 12 1 2,0 1,0 WW151515 2,5 2,0 WW151515-00
300 300 300 78 M 16 1 2,5 1,5 WW303030 3,0 2,5 WW303030-00
400 400 400 185 M 16 2 2,5 1,5 WW404040 3,5 2,5 WW404040-00
500 500 500 365 M 20 2+2 3,0 2,0 WW505050 4,0 3,0 WW505050-00
600 600 600 365 M 20 2+2 3,0 2,0 WW505050 4,0 3,0 WW505050-00
750 750 750 1.230 M 24 4+4 3,5 2,5 WW757575 5,0 3,5 WW757575-00
1.000 1.000 1.000 2.900 M 30 4+4 4,0 3,0 WW100100100 6,0 4,0 WW100100100-00

Table 6: Granite cubes, 90° angle according to DIN 875.

Send an enquiry for a granite cube:
info@thome-praezision.de