# Supplier RFQ - Marimba C3-C6 Build

## Scope

Request quotes for one 37-bar C3-C6 marimba prototype build. Prices, stock, and lead times are intentionally not assumed in this repo; verify current facts before purchasing.

## Bar Lumber

Please quote clear straight-grain African Padauk suitable for tuned percussion bars.

Required:

- Final thickness after surfacing: `0.875 in`.
- Longest finished bar: `32.251 in`.
- Widest finished bar: `2.000 in`.
- Preferred rough allowance: at least `34 in x 2.25 in x 1.00 in` for the longest bass blanks.
- Quantity: enough for 37 bars plus at least 3 pilot/scrap bars.
- Grain: straight, stable, no checks through the finished bar area.
- Moisture content: provide measured or estimated value.

Alternates:

- Hard maple for education/prototype comparison.
- Cherry for easier machining comparison.

Do not substitute material directly into the build schedule without updating the K constant and validating pitch.

## Resonator Tubes

Please quote PVC or aluminum tube options for 37 quarter-wave resonators.

Required quote data:

- Material.
- Nominal size.
- Actual ID and OD.
- Wall thickness.
- Available lengths.
- Compatible caps, plugs, or stopper hardware.
- Cutting service availability.

The first-pass length range in this packet is about `2.2 in` to `24.3 in`, before oversize tuning allowance. Actual lengths must be recalculated if bore differs from the workbook proxy.

## Hardware

Please quote:

- Low-stretch support cord or equivalent.
- Rubber or silicone tubing/grommets for support isolation.
- Frame fasteners suitable for removable tuning access.
- Optional threaded inserts for rail/cross-member joints.

## CNC Tooling

Please quote:

- 3/4 in carbide ball-end mill, hardwood capable.
- 1/2 in carbide ball-end mill, hardwood capable.
- 1/4 in downcut spiral router bit.
- 1/8 in upcut spiral router bit.

Include shank diameter, cut length, recommended feed/speed range, and replacement availability.

## Response Format

Please return:

```text
item
supplier part number
material/spec
actual dimensions
quantity available
unit price
lead time
shipping estimate
notes/substitution risks
```