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Wind Tunnel Balance

Stewart Piano Tuning Hammer

PTH-5-1

High Stiffness, Low Weight

Aerospace quality throughout

The Stewart Piano Tuning Hammer PTH-5-1

The Stewart PTH-5-1 will probably be the best tuning hammer you will ever tune with.

Designed by the KineOptics design team, the Stewart Piano Tuning Hammer is made from aerospace materials and manufacturing techniques. The Aluminum Arm and Titanium Torque Shaft have been extensively analyzed using modern Finite Element Analysis software for material dimensions and thickness for maximum stiffness with minimal weight.

When held, the Tuning Hammer has a good feel and balance to minimize fatigue during those long tuning sessions.

Our Tip is very special, being manufactured in our shop with a proprietary method that results in an extremely accurate and smooth internal square shape. This special design and manufacturing method will greatly reduce the marking of the piano tuning pegs. The fit is very good on the pins which adds to the solid feel while tuning. These tips are offered in sizes 1, 2, 3, and 4.

The Titanium Torque Shaft projects 1 inch from the handle at a 5 degree angle. The Torque Shaft is set into the handle and located securely with an 8 sided modified spline and locked with a screw.

The Arm is CNC machined from aluminum and anodized a nice Dark Red. The I beam cross section was designed using Finite Element Analysis to reduce weight while keeping stiffness high.

The Acetal Handle was designed to be comfortable in the hand and have maximum feel and control. The handle is machined out of Acetal engineering plastic and CNC machined in our shop.

All parts including our special tip are designed using CAD software and machined with CNC machines in our shop in Sequim Washington. We might offer extended line of different variations in the future depending on demand.

Watch John Ruggero's review of the PTH-5-1

Read Ryan Peterson's review of the Stewart PTH-5-1

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Tip: 17-4PH Stainless Steel, heat treated, (square feature profile accuracy + - .0002")
Torque Shaft: 6AL-4V Titanium
Arm: 6061 T6 Aluminum, type 2 anodized
Handle: Acetal Engineering Plastic, Black
Length: 11.750 inches (298mm)
Weight: 8.0 oz (228 grams)

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Pricing

Stewart PTH-5-1: $355.00 each (this price includes one tip of your choice)

Stewart Tip: $58.00 each Sizes offered, 1, 2, 3, 4

Please call or e-mail with any questions

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Ordering: Please contact us regarding your interest in the PTH-5-1. Please put PTH in the subject line to help us track orders. Include your address and what you would like to order. We will then calculate shipping cost and reply back. We can accept Checks and Paypal.

Shipping: We normally ship UPS or USPS.

For more information or to order: Call or E-Mail
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Wind Tunnel Balance

The rectangular cross section of the Stewart PTH-5-1 provides positive rotational control when placing it on tuning pins.
This design feature will speed up your tuning.

Wind Tunnel Balance

This image shows the torque tube set into the handle. This spline feature
is an interference fit and makes the two parts essentially one piece.

Wind Tunnel Balance

This image is of two tips. The one on the left is the worst tip we have ever seen.
The tip on the right is our tip, manufactured in Washington State.
The image was taken in our J L profile projector.
Notice the accurate profile of our tip and the rounded inside corners.
This accurate, smooth profile will protect expensive tuning pins from marks.

Wind Tunnel Balance

This picture is of the final FEA analysis of the PTH Arm after extensive design
changes to achieve uniform stress of the PTH Arm I beam cross section. Notice the even stress, blue and cyan, of the handle lever. Notice how the stress increases as the diameter of the Titanium Torque Shaft decreases as it approaches the Tip.

We have had some questions and here are the answers.

1: "Your tip looks great, but when tuning, it is an excellent fit on some piano pins, but a bit wobbly on other pins."

Our tip is manufactured to very tight tolerances and we have made a QC gauge to test each one after manufacturing. The issue we have found is that there is variation in the piano tuning pins. There are several reasons which will result in a less than perfect fit. We have measured several of these variations and it is not just in the diameter or total angle of the square taper, but we have also measured a different angle and position of the square taper on each opposing pair of flats. This results in a tighter fit in one direction, but a bit loose 90 degrees to that.

2: "On a few pianos I have tuned with your lever, the large size of the handle head interferes with the case on a few pins."

There is no way around that. To get the stiffness and keep the weight low, the large diameter of the head has to exist to lower the stress, thus keepng it feeling very stiff. The Stewart PTH will be able to access all but a few pins on most pianos. On most pianos, one will be able to tune every pin with the PTH. But to get to those few pins that are close to and edge, one will have to use a lever with a longer reach, thinner head, or a tip extension. But what the PTH will do is tune all but a few pins with a feel and speed that will reduce your tuning time and increase your precision.

3: "The lever is great and extremely stiff and ligh, but I have anodized aluminum parts on my bike and they get scratched up"

Yes, any anodized aluminum part will scratch and dent, but we needed to use aluminum to get the best balance between stiffness and weight. If you are like us and take pride in our tools, you can wrap the handle with some self adhereing stretch tape. This is also recommended when one wants to protect the paint on the plate and any other surface on the piano that could be damaged accidentaly from the hammer.

4: "Will other tips fit on your lever?

Yes, as far as we know, every other tip we tried fits on our threads.

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