presses:poco
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| presses:poco [2026/09/24 20:16] – [Recommended Packing Formula] mbpdocs_admin | presses:poco [2026/09/24 20:27] (current) – [Poco Troubleshooting, Maintenance and Resources] mbpdocs_admin | ||
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| - | ====== Poco Troubleshooting, | + | ====== |
| ===== Packing and Bed Adjustment for Photopolymer Plates & Type High Blocks ===== | ===== Packing and Bed Adjustment for Photopolymer Plates & Type High Blocks ===== | ||
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| + | //The information in this section was pulled from a variety of sources by an AI agent. Once all recommendations have been confirmed or edited by MBP, this disclaimer will be removed.// | ||
| The Hacker Poco Proof Press (typically the No. 0 model) features a cylinder with a standard cylinder undercut of .050 inches. This means the bare cylinder sits exactly .050" below its bearers. [1] | The Hacker Poco Proof Press (typically the No. 0 model) features a cylinder with a standard cylinder undercut of .050 inches. This means the bare cylinder sits exactly .050" below its bearers. [1] | ||
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| - | * If printing with a galley plate (.050" steel plate in the bed): You are printing at type-high (.918" | + | |
| - | * If the plate is removed: The bed is dropped to galley height. If you print directly from wood/lead type locked on the bed without a galley plate, you will need to add an extra .050" of heavy pressboard or a steel shim under your form to avoid an under-inked, | + | * If the plate is removed: The bed is dropped to galley height. If you print directly from wood/lead type locked on the bed without a galley plate, you will need to add an extra .050" of heavy pressboard or a steel shim under your form to avoid an under-inked, |
| ==== Pro-Tips for the Hacker Poco ==== | ==== Pro-Tips for the Hacker Poco ==== | ||
| - | * Keep It Centered: When wrapping the cylinder, cut your inner packing sheets slightly narrower than the cylinder face. Ensure the packing paper does not wander or overlap onto the cylinder bearers (metal rails on the side), which will ruin your registration and slur the print. [11, 12] | + | |
| - | * Hard vs. Soft: For crisp type and wood engravings, place a hard sheet of pressboard directly underneath your top tympan sheet. If your type is worn or uneven, move the softer bond paper to the top layer just below the tympan to cushion the bite. [8, 13, 14] | + | * Hard vs. Soft: For crisp type and wood engravings, place a hard sheet of pressboard directly underneath your top tympan sheet. If your type is worn or uneven, move the softer bond paper to the top layer just below the tympan to cushion the bite. [8, 13, 14] |
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| To prevent having to rip out your cylinder packing every time you switch methods, you should establish a permanent type-high (.918" | To prevent having to rip out your cylinder packing every time you switch methods, you should establish a permanent type-high (.918" | ||
| - | ==== 1. The Fixed Cylinder Packing Setup ==== | + | ==== The Fixed Cylinder Packing Setup ==== |
| Pack your cylinder exactly to .052 inches (your .050" undercut + .002" squeeze). Use a hard packing recipe to accommodate both mediums beautifully: | Pack your cylinder exactly to .052 inches (your .050" undercut + .002" squeeze). Use a hard packing recipe to accommodate both mediums beautifully: | ||
| - | * Top Sheet: .006" Oiled Tympan. | + | |
| - | * Under Top Sheet: .020" or .025" Hard Pressboard (essential for crisp photopolymer highlights). | + | * Under Top Sheet: .020" or .025" Hard Pressboard (essential for crisp photopolymer highlights). |
| - | * Fillers: 50lb or 60lb offset/book text sheets (roughly .004" each) to bring the total micrometer reading to .052". | + | * Fillers: 50lb or 60lb offset/book text sheets (roughly .004" each) to bring the total micrometer reading to .052". |
| Once this is clamped tight, leave it alone. Do not change it when swapping forms. | Once this is clamped tight, leave it alone. Do not change it when swapping forms. | ||
| - | ==== 2. Form Adjustments in the Press Bed ==== | + | ==== Form Adjustments in the Press Bed ==== |
| Because your press packing is now locked into a strict .918" type-high expectation, | Because your press packing is now locked into a strict .918" type-high expectation, | ||
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| - | * Watch out for " | + | |
| - | * The Wood Type Factor: Hard packing is great for photopolymer, | + | * The Wood Type Factor: Hard packing is great for photopolymer, |
| Using a KF95 photopolymer plate on a custom base built to Standard Boxcar Base dimensions is an ideal setup. The math for your Hacker Poco press lines up perfectly with a universal type-high (.918" | Using a KF95 photopolymer plate on a custom base built to Standard Boxcar Base dimensions is an ideal setup. The math for your Hacker Poco press lines up perfectly with a universal type-high (.918" | ||
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| ==== The Math: Base + Plate Setup ==== | ==== The Math: Base + Plate Setup ==== | ||
| - | * Your Plate (KF95): Measures exactly .037" thick. | + | |
| - | * Your Base (Standard Boxcar Specs): Machined to .875" thick. | + | * Your Base (Standard Boxcar Specs): Machined to .875" thick. |
| - | * The Adhesive (Sticky-Back Film): Typically averages .005" to .006" thick. [3, 4, 5, 6] | + | * The Adhesive (Sticky-Back Film): Typically averages .005" to .006" thick. [3, 4, 5, 6] |
| Because this combination meets the precise standard height of letterpress lead type (.918" | Because this combination meets the precise standard height of letterpress lead type (.918" | ||
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| Keep the galley plate in your Poco bed for both configurations. [2] | Keep the galley plate in your Poco bed for both configurations. [2] | ||
| - | * When printing photopolymer: | + | |
| - | * When printing traditional lead/wood type: Remove the base, and lock your type directly onto the galley plate. [1, 7] | + | * When printing traditional lead/wood type: Remove the base, and lock your type directly onto the galley plate. [1, 7] |
| Because both setups resolve to .918", your cylinder packing can remain completely locked into your calculated .052" thickness setup. You will not need to alter your packing formula when shifting between antique type and modern photopolymer. | Because both setups resolve to .918", your cylinder packing can remain completely locked into your calculated .052" thickness setup. You will not need to alter your packing formula when shifting between antique type and modern photopolymer. | ||
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presses/poco.1790280985.txt.gz · Last modified: by mbpdocs_admin