# Rolling parallel ruler blade 200 × 24 × 6 with lugs for a Ø3 axle

> What is a rolling parallel ruler blade?

- Category: Hardware › Mechanism parts
- Kind: Modern device
- Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
- Page: https://xemstudio.com/objects/rolling-ruler-blade-200-d18/ · JSON: https://xemstudio.com/api/geometry?object=rolling-ruler-blade-200-d18 · Plain text: https://xemstudio.com/objects/rolling-ruler-blade-200-d18/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files Xem Studio Design License (free to use and sell from, not to redistribute as files: https://xemstudio.com/license/)
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 200.0 | 24.0 | 13.0 |

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- 200 × 24 × 6 straight-edge with four lugs holding a Ø3 axle 8 mm above its underside and two 5 × 20 openings at x = ±60 (5 along the blade) through which the Ø18 rollers reach 1 mm below the blade; the rollers' rims do the guiding, the blade's long edges do the drawing.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| blade | 200 × 24 × 6 mm |
| axle holes | Ø3, centre 8 mm above the underside |
| roller openings | 2 × 5 × 20 mm at x = ±60 |
| lugs | 4 × 6 × 10 × 7 mm |

## Where the files are

- Henry T. Brown (1868, public domain): [Five Hundred and Seven Mechanical Movements — scan on archive.org](https://archive.org/details/fivehundredseven00browiala) — web — Publisher's page; dimensions are facts
- 507movements.com: [Brown's movement No. 323: figure, his text and an animation](https://507movements.com/mm_323.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/rolling-parallel-ruler-mechanism/) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/rolling-ruler-blade-200-d18/index.json · license: https://xemstudio.com/files/hardware/rolling-ruler-blade-200-d18/LICENSE.md

- rolling-ruler-blade-200-d18: [STEP](https://xemstudio.com/files/hardware/rolling-ruler-blade-200-d18/rolling-ruler-blade-200-d18.step) · [STL](https://xemstudio.com/files/hardware/rolling-ruler-blade-200-d18/rolling-ruler-blade-200-d18.stl) — blade, z 0..6, lugs to z 13, axle along X at z = 8

## Questions

**What is a rolling parallel ruler blade?**

200 × 24 × 6 straight-edge with four lugs holding a Ø3 axle 8 mm above its underside and two 5 × 20 openings at x = ±60 (5 along the blade) through which the Ø18 rollers reach 1 mm below the blade; the rollers' rims do the guiding, the blade's long edges do the drawing.

## Fits with

- [Rolling parallel ruler (blade on two notched rollers)](https://xemstudio.com/objects/rolling-parallel-ruler-mechanism/)