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Home >> Products >> Dovetail ruler
Made according to standard JB/T7977-99, while the work face adopts scraping processing. It is used for measuring the straightness and flatness of workpieces as well as the inspection and maintenance of guideways. There are two types as protruding and concave. In view of angle types, there are 45°， 55°， 60°， 90°， 120°。
| Type (mm) |
Straightness and flatness
of working surface |
α grade of the working
angle |
| Precision grade (μm) |
| 1 |
2 |
1 |
2 |
| Protruding 45°， 55°， 60°， 90°， 120° × 500 |
6 |
12 |
± 1 |
± 1.5 |
| Concave 45°， 55°， 60°， 90°， 120° × 500 |
6 |
12 |
± 1 |
± 1.5 |
| Protruding 45°， 55°， 60°， 90°， 120° × 750 |
8 |
15 |
± 1 |
± 1.5 |
| Concave 45°， 55°， 60°， 90°， 120° × 750 |
8 |
15 |
± 1 |
± 1.5 |
| Protruding 45°， 55°， 60°， 90°， 120° × 1000 |
9 |
18 |
± 1 |
± 1.5 |
| Concave 45°， 55°， 60°， 90°， 120° × 1000 |
9 |
18 |
± 1 |
± 1.5 |
| Protruding 45°， 55°， 60°， 90°， 120° × 1500 |
15 |
30 |
± 1 |
± 1.5 |
| Concave 45°， 55°， 60°， 90°， 120° × 1500 |
15 |
30 |
± 1 |
± 1.5 |
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