Xem Studiomeasured geometry

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Spanish burton with a lower block (4 : 1)

How does adding a lower block change a Spanish burton? · Hardware · basis: Xem Studio design following Brown No. 17 (1868)

Also called: spanish burton, double spanish burton, runner tackle, 4 to 1 pulley, aparejo español con motón inferior, Spanische Talje mit Unterblock

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

sizes
4 in table

Notes

  • Rope 1 runs from the lower (load) block over the fixed block to a runner; rope 2's standing end is on the fixed block's becket, it runs under the lower block, over the runner and down to the hand. Rope 2 carries P, the runner hangs on rope 1 at 2P, and the lower block is held by rope 1 (2P) and both legs of rope 2 (2P): P = W/4.
  • Pitch-Ø40 fixed block with a becket, pitch-Ø20 runner and pitch-Ø20 load block; the weight stem is on the line of the resultant pull (x = −10).
  • Brown's No. 17 shows a second Spanish barton; this is a Xem Studio arrangement of the same family, all strands vertical in one plane.
  • Parts (each has its own page): tackle-beam-240-sockets, tackle-block-20-top-stem-becket, tackle-block-10-top-socket, tackle-block-10-load-hook, rope-sheave-3mm-pitch-40, rope-sheave-3mm-pitch-20, ropes-3mm-spanish-burton-with-lower-block, tackle-weight-d40x40-socket, dowel-pins-metric.
  • Brown's movement No. 17 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

Spanish burton with a lower block size chart

parametervalue
fixed blockpitch Ø40, becket
runnerpitch Ø20
load blockpitch Ø20
mechanical advantage4

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Henry T. Brown (1868, public domain)Five Hundred and Seven Mechanical Movements — scan on archive.orgwebPublisher's page; dimensions are facts
507movements.comBrown's movement No. 17: figure, his text and an animationwebPublisher's page; dimensions are facts

Free files

★ Free files 1 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json

spanish-burton-with-lower-block-mechanism-assemblyAssembled mechanism, all parts placed at one pose (STEP keeps each part separate)STEP · STL
Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
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Plain text: sheet.txt · JSON: /api/geometry?object=spanish-burton-with-lower-block-mechanism

Spanish burton with a lower block (4 : 1), isometric render of a generated part
Render of spanish-burton-with-lower-block-mechanism-assembly from the free STEP; not to scale.

Fits with

Tackle beam 240 × 20 × 12 with Ø3 sockets every 5 mm, isometric render of a generated part
Tackle beam 240 × 20 × 12 with Ø3 sockets every 5 mm240.0×20.0×12.0 mm★ 1 file
Single block for a pitch-Ø40 sheave with stem up and a becket socket, isometric render of a generated part
Single block for a pitch-Ø40 sheave with stem up and a becket socket50.4×13.0×72.0 mm★ 1 file
Single runner block for a pitch-Ø20 sheave, rope socket on top, isometric render of a generated part
Single runner block for a pitch-Ø20 sheave, rope socket on top30.4×13.0×35.2 mm★ 1 file
Load block for a pitch-Ø20 sheave with a side rope socket and a weight stem, isometric render of a generated part
Load block for a pitch-Ø20 sheave with a side rope socket and a weight stem38.7×13.0×43.2 mm★ 1 file
Rope sheave for Ø3 rope, pitch Ø40 (rope centre), Ø44.4 rim, Ø4 bore, isometric render of a generated part
Rope sheave for Ø3 rope, pitch Ø40 (rope centre), Ø44.4 rim, Ø4 bore44.4×8.0×44.4 mm★ 1 file
Rope sheave for Ø3 rope, pitch Ø20 (rope centre), Ø24.4 rim, Ø4 bore, isometric render of a generated part
Rope sheave for Ø3 rope, pitch Ø20 (rope centre), Ø24.4 rim, Ø4 bore24.4×8.0×24.4 mm★ 1 file
Ø3 ropes for the spanish burton with a lower block (drawn in place), isometric render of a generated part
Ø3 ropes for the spanish burton with a lower block (drawn in place)43.0×3.0×161.5 mm★ 2 files
Weight Ø40 × 40 with a Ø3 top socket (394.58 g in steel), isometric render of a generated part
Weight Ø40 × 40 with a Ø3 top socket (394.58 g in steel)40.0×40.0×40.0 mm★ 1 file
Dowel pins, 2–6 mm (ISO 2338 / DIN 6325), isometric render of a generated part
Dowel pins, 2–6 mm (ISO 2338 / DIN 6325)5 sizes★ 23 files

Questions

How does adding a lower block change a Spanish burton?

Rope 1 runs from the lower (load) block over the fixed block to a runner; rope 2's standing end is on the fixed block's becket, it runs under the lower block, over the runner and down to the hand. Rope 2 carries P, the runner hangs on rope 1 at 2P, and the lower block is held by rope 1 (2P) and both legs of rope 2 (2P): P = W/4.