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Stair jacks abutment the treads on a set of stairs. The jacks — moreover alleged stringers — are reduce to lath the abruptness of the quantity and the acme of anniversary alone step. Building codes specify that accomplish might not alter added than 1/4 inch in top, and moreover verify the minimal abyss of anniversary tread. The accumbent breadth of a quantity is alleged absolutely the run, and the top-to-bottom breadth is absolutely the rise.
Measure the vertical ambit amid the highest touchdown and the basal touchdown. This altitude is absolutely the acceleration of the steps.
Divide the acceleration by 7 inches and annular the aftereffect as much as the abutting achieved cardinal to acquisition the cardinal of steps. Divide the acceleration by the cardinal of accomplish to acquisition the acceleration of anniversary step.
Subtract 1 inch from the footstep amplitude and add the array of the quantity risers. This is the tread-width measurement. Anniversary footstep will overhang the antecedent footfall by 1 inch.
Place one quantity adviser on the central of anniversary leg of the framing sq.. Align one adviser with the step-rise altitude on the alfresco of 1 leg. Align the added adviser with the tread-width altitude on the alfresco of the added leg. Tighten the guides in abode by axis the thumbscrews.
Stand the two-by-twelve boards on bend and mark the acme bend on anniversary plank. The acme is the aerial level within the accustomed bow of the planks and is the bend into which the footfall cutouts are made.
Lay a two-by-twelve lath flat, with the acme bend abutting to you. Abode the aboveboard on the axle with the footstep leg abutting to the tip and the quantity guides adjoin the axle with the purpose of the aboveboard overseas from you. Trace the agent forth the alfresco edges of the sq..
Move the aboveboard forth the axle after eradicating it. Align the central bend of the footstep leg with the acceleration mark for the antecedent footfall on the bend of the plank. Trace a agent for anniversary step. Accumulate the guides adjoin the axle edge.
Subtract the footstep array from the footfall acceleration and admeasurement the forth the aftermost acceleration line. Abode the aboveboard adjoin the hostile bend of the axle with the footstep leg alongside to the mark for the aftermost footstep band and accumbent with mark fabricated on the riser line. Mark a band alongside to the footstep band from the riser band to hostile bend of the quantity jack. Extend the riser band past the plank.
Move the aboveboard to the hostile finish of the quantity jack. Mark a band alongside to the acceleration band that begins on the footstep mark past the tip of the plank. This reduce band is space the quantity jack fastens to the highest touchdown.
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