This partial calculator keeps only ideal supporting-part and work arithmetic. It does not identify or reconstruct Spanish Burton form 2 because the claimed one-rope path, terminations, fixed and moving sheaves, segment sequence, displacement constraint and loss contacts are not defined.
Using a linear actuator with Spanish Barton (form 2) Mechanism
For actuator sizing, treat spanish barton (form 2) mechanism as a geometry problem first and a product-selection problem second. The actuator must produce enough push or pull force at the least favorable arm angle, not only at the easiest part of the motion.
With leverage, force is traded against travel. A bracket change that improves force can also increase required stroke, slow the output motion, or move the actuator into a poor mounting angle.
If extra force is added as a margin, confirm that the frame, hinge, pins, and brackets can take the load. A stronger actuator can protect the motor from stalling while quietly moving the failure point into the structure.
- Calculate actuator force at the worst bracket angle, not just at mid-stroke.
- Check stroke, retracted length, and extended length against the mechanism envelope.
- Confirm the structure can accept the higher loads created by a stronger actuator.
For a FIRGELLI actuator application, run the FIRGELLI actuator force calculator, then compare available stroke, force, and mounting envelope in the FIRGELLI linear actuator range. If the goal is to replace an existing unit, use the linear actuator replacement finder before assuming the new actuator is a direct fit.
Partial · Ideal Supporting-Part Work Ledger
Explore ideal supporting-part count and conservation of work without inventing a one-rope Spanish Burton route.
Equation Used
- N is a user-selected abstract supporting-part count.
- Supporting parts are ideal, vertical and equal-tension.
- The model is lossless and obeys conservation of work.
- Rope continuity, terminations, fixed and moving sheaves, loss passes, reactions, dynamics and safety factors are excluded.
The secondary figure is a parallel-line tally, not a continuous rope path.
Supported ideal supporting-part arithmetic
For an explicitly selected count N of equal-tension vertical supporting parts in an ideal lossless model, ideal mechanical advantage is N, ideal pull force is mg/N, ideal haul length for lift h is Nh and ideal input work equals mgh.
This is an abstract work ledger, not proof of one continuous rope or a named tackle.
Use and boundary
Use the ledger to understand ideal supporting-part count and conservation of work. Do not use it to determine a real Spanish Burton pull, number of loss passes, sheave efficiency, reactions or safety factor.
Ideal lossless identities
MA_ideal=N; F_ideal=mg/N; haul=N h; work=F haul=mgh.
Default selected-value example
For m=250 kg, h=1 m and selected N=5, ideal pull is about 490.3 N, ideal haul length is 5 m and ideal input work is about 2451.7 J.
Unsupported reeving and loss claims removed
The former model allowed changing support-part count while retaining exactly four loss passes and drew parallel lines as if they were one continuous rope. Those claims were removed; the lines are now an abstract count tally only.
Questions
Does N identify Spanish Burton form 2?
No. It is an abstract selected supporting-part count.
Are four sheave losses applied?
No. A pass sequence is not defined.
Is the drawing a rope route?
No.
References
References & Further Reading
- Wikipedia contributors. Block and tackle. Wikipedia
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