The Grandwork System provides guidance and tools for piano technicians to excel at grand regulating and have success with their voicing. Hammers address strings vertically, optimizing repetition, power, and tone. And work done on the bench is easier to see, easier to access, and easier on the technician's body.
In Dale Probst's words: "The Regulation Station brings grand action work out of the cave."
Bedding and Sampling
Make sure shanks are off rest cushions and samples have no excessive friction. Remove the action return spring and sand out any indentations in the keyframe. If the backrail or the frontrail has a bedding problem, follow the Grandwork Bedding Protocol. Otherwise, bed the balancerail using the WNG Keyframe Bedding Tool, pedals fully depressed.
On the workbench, fix action position and shim frontrail and backrail to be stable. Regulation Stations with a Custom Keybed make this easy! Set Regulating Rack templates to represent string heights along the strike line and set stops on the legs so all the way up is strike and all the way down is hammerline. On the templates at strike, record the hammer spacing scale and with the String Height Gauge, record end-of-section template heights.
With the assistance of Gauge Keys, fully regulate a natural and a sharp to validate specs, parts, and materials. Tweak geometry or make other changes while still chargeable as extras.
Remove hammers and whippens to an Action Tray, storing screws in order along the edges. File flared hammers with the Hammer Filing Jig. Pin hammer flanges and repetition levers as needed. Then, with parts back on, space hammers to the Hammer Spacing Scale and whippens to the hammers.
Making Hammers and Hammer Travel Vertical
Set up the Squaring Platform (see Grandwork Alignment Protocol), traveling shanks to vertical with the Shank Traveler and squaring hammers to vertical at strike with the Hammer Square (strike provided by the Regulating Rack). Finish by spacing hammers to the Hammer Spacing Scale (also provided by the Regulating Rack) and then gang-file the straight-bored hammers.
For best results, use the Regulating Rack to measure bore distance (from strike to hammer centers) before boring hammers. Cut overall hammer length based on these measurements and bore from the tails. This custom work ensures that all aspects of the regulation and string-to-hammer mating will work properly.
Leveling Keys and Regulating
Level keys next (on the workbench), squaring and spacing as you go. Keysteps, pre-set in the piano, support the leveling sample keys, which support the straightedge. Level sharps and naturals in the same passes, settling keys thoroughly before and after each round.
If needed, rough in any elements that are very out of spec (see the Regulation Protocol) and set dip to what your regulating samples indicated (to be refined later by aftertouch). Space backchecks and set naturals to check as high as possible without upswing tail-scraping. Set sharps to match naturals. And set spring tension, now that backchecking height is correct.
Then, set jack-to-knuckle position, regulating to samples using an 18” ruler and under-lighting with a Lighting Rail. Place the Regulating Rack set at hammerline (with lights plugged in) just back from hammer crowns and wink hammers to set repetition height. Now, set hammerline, letoff (measured with Gauge Keys) and drop, and refine aftertouch by dip and backchecks by playing hammers into check off the Regulating Rack.
For some jobs, you are now done. But for others, you are ready to weigh off. This step adds evenness and simplifies voicing.
Using the WNG Key Gram Weight Set, match downweight and upweight speeds for each key, choosing downweights and upweights that provide clear, positive motion (no need for topstack tapping). Apart from being fast, matching speeds reveals any frictional irregularities, slower indicating too much friction, faster, too little.
Then, a refinement pass, fast and fun, a polishing of your work…
Back to the Piano
Reinstall the action return spring, checking that bearing surfaces are perpendicular and shimming the spring with frontrail punchings if they are not.
If glide bolts were used to set balancerail height on the workbench (the best procedure without a Regulation Station Deluxe or Full Monte), return them to correct in-piano positions, an easy matter with the WNG Keyframe Bedding Tool.
Then, settle wire, pitch-raise, and mate strings to hammers. This string leveling optimizes damper function, so fine regulate the dampers next, followed by pedals and trapwork.
For both piano technician and customer, the results will exceed expectation. And achieving these results grows a confidence to sell more jobs - and sell them for more money!
Full regulations are undersold today. Technicians find the miscalculations of traditional regulating expensive and the learning curve long. The Grandwork System reduces the experience needed to succeed at each step and its go-nogo methodology breeds speed and accuracy. Win win!!