# Jewelry

# Central Machinery Bench Buffer

## Central Machinery Bench Buffer

##### Bench Buffer / Polisher

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[![Tool image](https://wiki.spen.cc/uploads/images/gallery/2026-02/scaled-1680-/image-placeholder-title.avif)](https://wiki.spen.cc/uploads/images/gallery/2026-02/image-placeholder-title.avif)

<p class="callout warning">This tool can be used by members and non-members who are well-versed in the operation of the tool. Trainings can always be requested at #class-requests on Slack</p>

<table border="1" id="bkmrk-model-no226002-%28item" style="border-collapse: collapse; width: 43.6905%;"><colgroup><col style="width: 43.9779%;"></col><col style="width: 56.0221%;"></col></colgroup><tbody><tr><td>Model No</td><td>226002 (item 94071)</td></tr><tr><td>Date Purchased</td><td>—</td></tr><tr><td>Status</td><td>Operational</td></tr><tr><td>Link To Manual</td><td>[Manual (94071)](https://www.manualslib.com/manual/1129931/Chicago-Electric-94071.html)</td></tr><tr><td>Link to product page</td><td>[Harbor Freight manuals](https://manuals.harborfreight.com/)</td></tr></tbody></table>

---

#### Description

6" bench buffer/polisher (Chicago Electric 94071, HF 226002) for jewelry and metal polishing. Eye protection required; secure hair and loose clothing.

#### Specifications

<table border="1" id="bkmrk-wheel-size6-in-arbor" style="border-collapse: collapse; width: 65%;"><tbody><tr><td>**Wheel size**</td><td>6 in</td></tr><tr><td>**Arbor**</td><td>1/2 in</td></tr><tr><td>**Speed**</td><td>3600 RPM (no load)</td></tr><tr><td>**Power**</td><td>120 VAC, 60 Hz, 0.4 A</td></tr><tr><td>**Harbor Freight item**</td><td>94071 (internal ref. 226002)</td></tr></tbody></table>

#### Additional Resources

- [94071 owner manual](https://www.manualslib.com/manual/1129931/Chicago-Electric-94071.html)

# AmScope Stereo Microscope

## AmScope Stereo Microscope

##### Microscope

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[![Tool image](https://wiki.spen.cc/uploads/images/gallery/2026-02/scaled-1680-/image-placeholder-title.avif)](https://wiki.spen.cc/uploads/images/gallery/2026-02/image-placeholder-title.avif)

<p class="callout warning">This tool can be used by members and non-members who are well-versed in the operation of the tool. Trainings can always be requested at #class-requests on Slack</p>

<table border="1" id="bkmrk-model-notbd-%2810%C3%97%E2%80%9340%C3%97" style="border-collapse: collapse; width: 43.6905%;"><colgroup><col style="width: 43.9779%;"></col><col style="width: 56.0221%;"></col></colgroup><tbody><tr><td>Model No</td><td>TBD (10×–40× stereo, analog)</td></tr><tr><td>Date Purchased</td><td>—</td></tr><tr><td>Status</td><td>Operational</td></tr><tr><td>Link To Manual</td><td>[AmScope contact / support](https://amscope.com/pages/contact-us)</td></tr><tr><td>Link to product page</td><td>[AmScope stereo microscopes](https://amscope.com/collections/stereo-microscopes)</td></tr></tbody></table>

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#### Description

Stereo analog microscope (~10×–40×) for inspection and jewelry work. Use eyepieces (not USB). Update model number when nameplate is documented.

#### Specifications

<table border="1" id="bkmrk-typestereo-%28dissecti" style="border-collapse: collapse; width: 65%;"><tbody><tr><td>**Type**</td><td>Stereo (dissecting), analog</td></tr><tr><td>**Magnification**</td><td>~10×–40× (marked on unit)</td></tr><tr><td>**Illumination**</td><td>Incident / transmitted (per model—verify on unit)</td></tr><tr><td>**Model no.**</td><td>TBD — add from nameplate</td></tr></tbody></table>

#### Additional Resources

- [Stereo microscope category](https://amscope.com/collections/stereo-microscopes)
- [AmScope support](https://amscope.com/pages/contact-us)

# GraverSmith Pneumatic Engraver

## GraverSmith Pneumatic Engraver

##### Pneumatic Engraver

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[![Tool image](https://wiki.spen.cc/uploads/images/gallery/2026-02/scaled-1680-/image-placeholder-title.avif)](https://wiki.spen.cc/uploads/images/gallery/2026-02/image-placeholder-title.avif)

<p class="callout danger">This tool is restricted to Makerspace Members, and requires a training before use. Request a training on Slack: #class-requests</p>

<table border="1" id="bkmrk-model-nograversmith-" style="border-collapse: collapse; width: 43.6905%;"><colgroup><col style="width: 43.9779%;"></col><col style="width: 56.0221%;"></col></colgroup><tbody><tr><td>Model No</td><td>GraverSmith (GRS 005-895)</td></tr><tr><td>Date Purchased</td><td>—</td></tr><tr><td>Status</td><td>Operational</td></tr><tr><td>Link To Manual</td><td>[GRS GraverSmith (PDFs on page)](https://grs.com/product/graversmith-4/)</td></tr><tr><td>Link to product page</td><td>[GRS GraverSmith](https://grs.com/product/graversmith-4/)</td></tr></tbody></table>

---

#### Description

GRS GraverSmith pneumatic engraving system for stone setting and metal engraving. Requires clean, oil-free shop air (≥45 psi). Handpieces sold separately.

#### Specifications

<table border="1" id="bkmrk-grs-item005-895-dime" style="border-collapse: collapse; width: 65%;"><tbody><tr><td>**GRS item**</td><td>005-895</td></tr><tr><td>**Dimensions**</td><td>7.12 × 9.54 × 6.3 in</td></tr><tr><td>**Weight**</td><td>8.3 lb</td></tr><tr><td>**Air requirement**</td><td>≥45 psi, 1.4 CFM (40 L/min), oil-free</td></tr><tr><td>**Handpiece ports**</td><td>1 standard</td></tr><tr><td>**Control**</td><td>Foot pedal</td></tr><tr><td>**Power**</td><td>100/220 V, 50/60 Hz (unit power supply)</td></tr></tbody></table>

#### Additional Resources

- [Product page + manuals](https://grs.com/product/graversmith-4/)

# Foredom Rotary Tool

## Foredom Rotary Tool

##### Flex-Shaft Rotary Tool

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[![Tool image](https://wiki.spen.cc/uploads/images/gallery/2026-02/scaled-1680-/image-placeholder-title.avif)](https://wiki.spen.cc/uploads/images/gallery/2026-02/image-placeholder-title.avif)

<p class="callout danger">This tool is restricted to Makerspace Members, and requires a training before use. Request a training on Slack: #class-requests</p>

<table border="1" id="bkmrk-model-nohp4-917-date" style="border-collapse: collapse; width: 43.6905%;"><colgroup><col style="width: 43.9779%;"></col><col style="width: 56.0221%;"></col></colgroup><tbody><tr><td>Model No</td><td>HP4-917</td></tr><tr><td>Date Purchased</td><td>—</td></tr><tr><td>Status</td><td>Operational</td></tr><tr><td>Link To Manual</td><td>[Foredom document downloads](https://www.foredom.net/document-downloads/)</td></tr><tr><td>Link to product page</td><td>[HP4-917 control unit](https://www.foredom.net/product/brush-type-control-unit-110-120-volt-or-220-240-volt/)</td></tr></tbody></table>

---

#### Description

Foredom flex-shaft system (HP4-917 control) for carving, grinding, and polishing. Foot pedal speed control; secure work in a vise or holder.

#### Specifications (HP4-917 control)

<table border="1" id="bkmrk-outputdc-30-v-%2F-1.2-" style="border-collapse: collapse; width: 65%;"><tbody><tr><td>**Output**</td><td>DC 30 V / 1.2 A</td></tr><tr><td>**Input voltage**</td><td>110/120 or 220/240 V (selector on rear)</td></tr><tr><td>**Control size**</td><td>~4.4 × 5.8 × 3.8 in</td></tr><tr><td>**Features**</td><td>Forward/reverse, manual/foot speed, overload protection</td></tr><tr><td>**Typical kits**</td><td>K.1020, K.1070, K.1080, K.1090 (brush-type micromotor)</td></tr></tbody></table>

#### Additional Resources

- [Manuals (K.1070 rotary, HP4-917)](https://www.foredom.net/document-downloads/)
- [HP4-917 product page](https://www.foredom.net/product/brush-type-control-unit-110-120-volt-or-220-240-volt/)

# Pulse Arc Welder

## Pulse Arc Welder

##### Pulse Arc Welder

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[![Tool image](https://wiki.spen.cc/uploads/images/gallery/2026-02/scaled-1680-/image-placeholder-title.avif)](https://wiki.spen.cc/uploads/images/gallery/2026-02/image-placeholder-title.avif)

<p class="callout danger">This tool is restricted to Makerspace Members, and requires a training before use. Request a training on Slack: #class-requests</p>

<table border="1" id="bkmrk-model-nopulse-arc-%28s" style="border-collapse: collapse; width: 43.6905%;"><colgroup><col style="width: 43.9779%;"></col><col style="width: 56.0221%;"></col></colgroup><tbody><tr><td>Model No</td><td>Pulse arc (see listing)</td></tr><tr><td>Date Purchased</td><td>—</td></tr><tr><td>Status</td><td>Operational</td></tr><tr><td>Link To Manual</td><td>[Reference listing](https://www.aliexpress.us/item/3256810314883720.html)</td></tr><tr><td>Link to product page</td><td>[AliExpress listing](https://www.aliexpress.us/item/3256810314883720.html)</td></tr></tbody></table>

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#### Description

Pulse arc welder for jewelry repair and tack welding. Unit matches the [linked listing](https://www.aliexpress.us/item/3256810314883720.html) but may show a different brand on the case. Welding-rated eye protection and argon per training.

#### Specifications

<table border="1" id="bkmrk-processpulse-arc-%2F-m" style="border-collapse: collapse; width: 65%;"><tbody><tr><td>**Process**</td><td>Pulse arc / micro TIG class (jewelry)</td></tr><tr><td>**Shielding gas**</td><td>Argon (verify regulator and flow with training)</td></tr><tr><td>**Electrodes**</td><td>Tungsten, sized to material (training)</td></tr><tr><td>**PPE**</td><td>Welding-rated eye protection required</td></tr><tr><td>**Documentation**</td><td>Use listing manual + shop training checklist</td></tr></tbody></table>

#### Additional Resources

- [Reference product listing](https://www.aliexpress.us/item/3256810314883720.html)