P16510: Reconstruction of a Wooden Common Press
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Preliminary Detailed Design

Table of Contents

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Team Vision for Preliminary Detailed Design Phase

For this stage of the project, the team decided to split into two separate groups to utilize individual strengths and accomplish the necessary tasks in the most efficient manner. The lead design engineer and test engineer ( Ferris and Randy) spent most of their time working on developing the preliminary design and drawing. The research lead and project manager ( Seth and Veronica) focused on sourcing and procurement of both the materials and outsourced labor.

The team set out to achieve the following goals and is delighted to report the successful completion of all.:

Prototyping, Engineering Analysis, Simulation

Hindpost Stress analysis

Hindpost Stress analysis

Stresses when loaded by a 200lb man sitting on the upper hind rail. This was done as a safety check in case someone decided to misuse the press. Material was assumed to be white oak. (The units are Pounds per square inch notated strangely from the program)

Displacement of Platten During Printing

Displacement of Platten During Printing

Displacement when printing. Input force is the 200lb exerted by the spindle distributed by the platten pan. The wood was assumed to be white oak for simplicity.

Extreme Bar Stresses

Extreme Bar Stresses

Bar stress worst case scenario of a 200lb man leaning all his weight into the bar.

Drawings, Schematics, Flow Charts, Simulations

Below are a sample of drawings created during this phase of the project. A folder containing all and the most recent revisions of each drawing is available here: PDF Drawings.
Cheek Assembly
Drawing Information & Design Rationale
  • Two cheeks; each is a mirror of the other.
  • Overall height of 73.5" was inspired by the Roy press.
  • Clear evidence of dovetails on earlier presses; not seen on the Roy press
    • Added for aesthetics and stability.
  • 4" vertical gaps are intentionally oversized; packing was used to adjust each part into place.
    • However, the components in these slots should not need to be packed such that part of it extends passed the bounds of it's gap
    • This occurred with the head during assembly, 10.75" was adjusted down from 12".
  • This represents the basic form
  • The top and bottom edges often have decorative moldings.
  • Plan to update release these with a few different molding options.
  • Holds the nut, which holds the spindle.
  • Added the dovetail for better stability between the cheeks.
  • Lacked many finer detailed dimensions; such as location of bolts. These were estimated according to earlier reference material and made to align with cap and nut.
  • Two halves of a till to create a single till; both are identical
  • Keeps the hose from rotating.
  • Dimensions of cut-out increased to support brass-clad added to till and iron clad of the hose.
  • Main loading surface
  • Supports the 200 lbs. press force, carriage, and stone.
  • Thicker wood to resist deflection during impression.
Feet Assembly
Drawing Information & Design Rationale
  • Two feet; each is a mirror of each other
  • Tenon depth estimated from earlier presses.
    • Cheek tenon extends through the foot.
    • Hind posts only partly through the foot.
  • Maintains horizontal distance between feet.
  • Rear mortise adjusted from roy to avoid intersection with hind post.
Hose Assembly
Drawing Information & Design Rationale
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  • Outer square dimension adjusted to fit in brass-clad till.
  • Taper angle estimated based on the hose dimensions.
  • Will be forged to rough shape and finished using CNC.
  • Dimensions estimated from franklins press.
  • Radial cut-out made to fit dimensions of spindle.
  • Provides track for spindle
  • Dimensions adjusted to interface with head.
  • Alternate nut design
  • Through-hole, removed flange, added decorative bottom, and squared side flanges.
  • Easier to cast.
Platen Assembly
Drawing Information & Design Rationale
  • Dimensions from Roy
  • Platten is slightly oversized to comfortably print a Folio sized page (18"x24") in two pulls
  • Plate was centered on platen to distribute force from spindle.
  • Helps to center spindle
  • Holds the thrust bearing.
  • Walls of the pan are less curved when compared to the Roy to simplify manufacturing.
  • Designed for a course thread such s 5/8"-11.
Bed Assembly
Drawing Information & Design Rationale
  • Dimensions based on Roy
  • Tenons were originally based on Franklin press, but simplified for manufacturing.
    • Franklin press had L-shaped tenons; changes these to rectangular to simplify manufacturing.
  • All dimensions based on Roy
    • Mortises made to match tenons on the end boards
  • Based on the length of the plank and length of the bed, gallows will need to be position at an angle away from the press

Bill of Material (BOM)

Finalized bill of materials.

Finalized bill of materials.

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Part sourcing estimates.

Part sourcing estimates.

Risk Assessment

Items highlighted in red are current risks to the project. Items 19 and 20 were added during this phase due to possible risks associated in speaking with potential blacksmiths. The team is actively monitoring these risks and working to mitigate as soon as possible.

Closed Risk: Line Item 11 Safety Risk - Ergonomic assessment is no longer in consideration since the team has collectively decided to let the historical dimensions dictate the overall design.

Current risks being tracked..

Current risks being tracked..

live document.

Plans for next phase

Part sourcing estimates.

Part sourcing estimates.


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