---
product_id: 320778364
title: "Turbine Reciprocating Pneumatic Ultrasound Grinder Micro Pneumatic Air Pencil Die Grinder Kit for Mould Metal Lapping Filing Grinding Buffing Polishing Sanding Tools"
brand: "si fang"
price: "$207"
currency: NZD
in_stock: true
reviews_count: 5
category: "Si Fang"
url: https://www.desertcart.nz/products/320778364-turbine-reciprocating-pneumatic-ultrasound-grinder-micro-pneumatic-air-pencil-die
store_origin: NZ
region: New Zealand
---

# 90 PSI air pressure, 0.08 m³/min air consumption Low vibration & noise 28,000 RPM max speed Turbine Reciprocating Pneumatic Ultrasound Grinder Micro Pneumatic Air Pencil Die Grinder Kit for Mould Metal Lapping Filing Grinding Buffing Polishing Sanding Tools

**Brand:** si fang
**Price:** $207
**Availability:** ✅ In Stock

## Summary

> ⚡ Elevate your craft with precision power in the palm of your hand!

## Quick Answers

- **What is this?** Turbine Reciprocating Pneumatic Ultrasound Grinder Micro Pneumatic Air Pencil Die Grinder Kit for Mould Metal Lapping Filing Grinding Buffing Polishing Sanding Tools by si fang
- **How much does it cost?** $207 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/320778364-turbine-reciprocating-pneumatic-ultrasound-grinder-micro-pneumatic-air-pencil-die)

## Best For

- si fang enthusiasts

## Why This Product

- Trusted si fang brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Cool & Durable:** Air-powered design prevents heat buildup, extending tool and workpiece life.
- • **Versatile Tooling:** Compatible with multiple fixtures for grinding, filing, polishing, and lapping on molds and metals.
- • **Compact & Portable:** Lightweight 210mm pen-style design fits perfectly in your hand for detailed, controlled work.
- • **Precision Powerhouse:** Turbocharged 28,000 RPM turbine engine for ultra-fine grinding and polishing.
- • **Effortless Efficiency:** High torque with low vibration and noise means longer work sessions without fatigue.

## Overview

The SI FANG Turbine Reciprocating Pneumatic Ultrasound Grinder is a high-speed, air-powered micro grinder designed for professional-grade polishing, grinding, and surface treatment of molds and metals. Operating at up to 28,000 RPM with 90 PSI air pressure, it delivers precise, low-vibration performance without heat buildup. Its compact, ergonomic design supports various grinding tools, making it ideal for detailed industrial and jewelry work, ensuring rapid surface refinement and extended tool life.

## Description

At SI FANG , we aim to manufacture the best products that inspire our consumers to live a more convenient, secure lifestyle. We have our professional products monitoring team to focus on every single detail that matters to you and develop well-made, portable, exquisite products. If you have any questions please contact me. I will reply within 24 hours and try my best to assist you. Features: It is 100%Brand new,high quality and never mounted. High torque pneumatic turbine engine structure accurate device can achieve the work efficiency. No heat, high efficiency drive,high speed bearing with long service life. The advantages of small volume, feel is good, low vibration, low noise, and the advantages of speed and torque. Linear reciprocating, circumference of oscillating pneumatic ultrasonic grinding machine is used pneumatic turbine engine structure technology. It can use different jig for grinding operation, can clamping file or the grinding tools, such as the grooves in the mold or hardware products,R Angle and other manual processing. Specification: Max RPM :28000RPM Max Air Pressure:0.6Mpa Air inlet: 1/4" Collet size: 1/8''（3mm） Color: Show as pictures Length of pen ：210mm Material: Metal + Plastic Package included: 1pcs×Ultrasonic Pneumatic Grinding Pen Kit Set 1pcs replaceable chuck 1pcs disassembly spanner 10pcs diamond file

Review: I am really impressed by this ultrasonic air-pencil grinder. I use it to relieve (open up) dimensions on slots and holes in laser-sintered components in 316L stainless steel in very fine increments of 0.0001” to 0.001” to make passage for inter-locking parts needing press-fit to slip-fit clearances. I much prefer this air-pencil grinder to using a milling machine to post-process my 316L SS parts as milling tends to heat and work-harden the surfaces. When using this air-pencil grinder, my 316L SS parts stay cool to the touch and never seem to even get warm. Though the product info says this air-pencil grinder needs around 2.9 cfm @ 90 PSI, I like to run it from a DeWalt pancake compressor that is rated to deliver 2.6 cfm @ 90 PSI. I can operate this air-pencil grinder at max “output” for about 10 minutes before the air pressure drops too low. With the motor on the single-stage compressor running constantly, the air pressure is sufficient to operate this air-pencil grinder at max output continually. I just wear ear-muffs to keep the constant loud noise from the compressor motor nearby from irritating and damaging my hearing. The reciprocating motion of the motor head is a forward-and backward oscillation in a slightly circular motion. This means that depending on the contours of what you are trying to grind, it is best to experiment with flipping the grind-head, bit or file that you are using to determine which oscillation loci gives the least amount of chatter. In other words, if you’re not getting smooth, grind action, just rotate the grinding head by 180 degrees. You don’t need to apply a lot of hand pressure. Light, even strokes give the best results. With flat-file heads, grinding metal at an angle is preferable to holding the grind head perpendicular to the surface being filed or ground. Too much hand pressure on a jack-hammer trajectory causes chatter and can chip your flat-file heads. When opening the diameter of thru-holes, I get the best, fastest results by holding both the hole and a round-file grinding head passing through it, vertically, and rotating the round-file head around the perimeter of the hole instead of pushing it back-and-forth along the bore axis of the hole. If you’re not getting the amount of material removal you desire, especially when grinding hard metals, the trick is not to increase the air-pressure from your compressor, but to lower the grit size of your grind heads to use more coarse abrasive. Be careful, as once you drop below #120 diamond grit, even hardened steel can come off much faster than expected — and it is way easier to remove metal than to replace it! I use light oil for lubricating jack-knifes, such as Swiss Army Knives, to lubricate this air-pencil. A few drops with a needle applicator into the [brass] air inlet nozzle at the rear of the air-pencil grinder before every use will keep things running smoothly. I suspect a lot of tool breakages that are cited in the comments are because users are not lubricating their air-pencil grinders frequently enough, are turning up the air pressure from their compressors past 90 psi, and are forcing their grind-heads into their parts like they are drilling them. The adapter for round-shaft grind-heads is installed as the factory default. A clamp adapter for holding flat-file heads is included, and is notched for smaller-diameter (e.g. less than 3 mm dia) round-file heads. Do not try to install the clamp adapter in place of the default adapter — the clamp adapter has a round stem slides into the default adapter. NOTE; when you are using the included hex wrench to tighten or loosen any of the adapters or tool holders, do not hold and torque against the body of the air-pencil grinder. Hold the adapters themselves. I suspect this is another cause for tool breakages, where users are using the body of the air-pencil grinder like a wrench handle. Don’t do this! There are reviewers who have cited that the air-hose coupler included in the kit is not the U.S. standard interface. The one that came with mine is compatible with and correct for all my U.S. standard air compressor equipment. The kit comes with a set of file head grinders in duplicate. The redundancy is nice as the ultrasonic oscillations can wear off even diamond grit in a short time. I use all variety of parallel round files with this air-pencil grinder after cutting their shanks (handles) to shorter lengths. I even use the grinding bits for sharpening chainsaw links in this air-pencil grinder, and the ones with the more coarse grit will trim away even hard steel with surprising speed. For $58, this air-pencil grinder is a great value that does the job of equipment priced 10X greater. At its very affordable price, I would just buy another one if this one breaks. However, with the right maintenance and care, as described above, I suspect this air-pencil grinder will last a long time. I’m really impressed with this air-pencil grinder. It’s been immensely useful to me right out of the box as a fine grinding tool. Used properly, it does in minutes on hard steel what would take days for me to grind manually / by hand. Remember that it is an air-pencil grinder and not an air-chisel or bench grinder and it will serve you well.
Review: This is what I've needed for quite some time. The short stroke is great for detailed work and the variable rate is useful as well. The only downside is the spacing of the slot is just a bit too wide to hold a blade for cutting rather than sanding. As a sander it is amazing!

## Features

- Suitable for industry polishing, grinding and surface treatment of industry mold and jewelry.
- Surface repair mould roughing and mirror polishing,can reduce work mould surface roughness rapidly until the lens, manual irreplaceable effect, get twice the result with half the effort.
- Turbine reciprocating pneumatic ultrasound grinding machine,using different fixture, can clamping mould , mini ceramic fiber oilstone、file and other ground tool,to all sorts of metal cutting,narrow slot、grinding 、polishing to mirror etc . Especially mould parts of precision processing , widely applied in all kinds of abrasive
- Air pressue: 90 PSI, Air consumption:0.08 m3/min,No need of lubricating oil,RPN: 30000 /min
- Small volume, feel is good, low vibration, low noise, Speed and torque

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07SJZKVX2 |
| ASIN  | B07SJZKVX2 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #238,598 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #711 in Power Grinders |
| Color | Blue |
| Customer Reviews | 4.3 4.3 out of 5 stars (54) |
| Customer reviews | 4.3 4.3 out of 5 stars (54) |
| Date First Available | 10 July 2019 |
| Date First Available  | 10 July 2019 |
| Item Weight | 590 g |
| Item model number | 0c87c32d-ba14-47a3-bb38-e35c90594921 |
| Item model number  | 0c87c32d-ba14-47a3-bb38-e35c90594921 |
| Manufacturer | SI FANG |
| Manufacturer  | SI FANG |
| Material | Metal, Plastic |
| Package Dimensions | 24.64 x 19.05 x 4.83 cm; 590 g |
| Package Dimensions  | 24.64 x 19.05 x 4.83 cm; 590 g |
| Power source type | Air Powered |
| Style | Portable,Micro |

## Product Details

- **Brand:** SI FANG
- **Colour:** Blue
- **Material:** Metal, Plastic
- **Power source:** Air Powered
- **Style:** Portable,Micro

## Images

![Turbine Reciprocating Pneumatic Ultrasound Grinder Micro Pneumatic Air Pencil Die Grinder Kit for Mould Metal Lapping Filing Grinding Buffing Polishing Sanding Tools - Image 1](https://m.media-amazon.com/images/I/61dtNlWKUEL.jpg)

## Questions & Answers

**Q: Your pictures shows a plastic connector between the motor and collet, how well do you think it handle the reciprocal motion?**
A: It seems to be functioning quite well and I have put several hours on mine

**Q: What is the stroke length? How many strokes per minute minimum and maximum?**
A: This is ultrasonic and not profiler

**Q: Is there any warranty?**
A: I'm not sure if there is a warranty but considering the price is not even one quarter of the price on most ultrasonics l considerate a good investment are you smiling regularly with no issues

**Q: What kind of air coupler is used in this item?**
A: That is an excellent question.  The air coupler is not recognizable to me and doesn't fit any connections that I know of (industrial, automotive or ARO), and there is no way to switch it out, so probably going to have to return the item.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by S***. on 29 September 2023*

I am really impressed by this ultrasonic air-pencil grinder. I use it to relieve (open up) dimensions on slots and holes in laser-sintered components in 316L stainless steel in very fine increments of 0.0001” to 0.001” to make passage for inter-locking parts needing press-fit to slip-fit clearances. I much prefer this air-pencil grinder to using a milling machine to post-process my 316L SS parts as milling tends to heat and work-harden the surfaces. When using this air-pencil grinder, my 316L SS parts stay cool to the touch and never seem to even get warm. Though the product info says this air-pencil grinder needs around 2.9 cfm @ 90 PSI, I like to run it from a DeWalt pancake compressor that is rated to deliver 2.6 cfm @ 90 PSI. I can operate this air-pencil grinder at max “output” for about 10 minutes before the air pressure drops too low. With the motor on the single-stage compressor running constantly, the air pressure is sufficient to operate this air-pencil grinder at max output continually. I just wear ear-muffs to keep the constant loud noise from the compressor motor nearby from irritating and damaging my hearing. The reciprocating motion of the motor head is a forward-and backward oscillation in a slightly circular motion. This means that depending on the contours of what you are trying to grind, it is best to experiment with flipping the grind-head, bit or file that you are using to determine which oscillation loci gives the least amount of chatter. In other words, if you’re not getting smooth, grind action, just rotate the grinding head by 180 degrees. You don’t need to apply a lot of hand pressure. Light, even strokes give the best results. With flat-file heads, grinding metal at an angle is preferable to holding the grind head perpendicular to the surface being filed or ground. Too much hand pressure on a jack-hammer trajectory causes chatter and can chip your flat-file heads. When opening the diameter of thru-holes, I get the best, fastest results by holding both the hole and a round-file grinding head passing through it, vertically, and rotating the round-file head around the perimeter of the hole instead of pushing it back-and-forth along the bore axis of the hole. If you’re not getting the amount of material removal you desire, especially when grinding hard metals, the trick is not to increase the air-pressure from your compressor, but to lower the grit size of your grind heads to use more coarse abrasive. Be careful, as once you drop below #120 diamond grit, even hardened steel can come off much faster than expected — and it is way easier to remove metal than to replace it! I use light oil for lubricating jack-knifes, such as Swiss Army Knives, to lubricate this air-pencil. A few drops with a needle applicator into the [brass] air inlet nozzle at the rear of the air-pencil grinder before every use will keep things running smoothly. I suspect a lot of tool breakages that are cited in the comments are because users are not lubricating their air-pencil grinders frequently enough, are turning up the air pressure from their compressors past 90 psi, and are forcing their grind-heads into their parts like they are drilling them. The adapter for round-shaft grind-heads is installed as the factory default. A clamp adapter for holding flat-file heads is included, and is notched for smaller-diameter (e.g. less than 3 mm dia) round-file heads. Do not try to install the clamp adapter in place of the default adapter — the clamp adapter has a round stem slides into the default adapter. NOTE; when you are using the included hex wrench to tighten or loosen any of the adapters or tool holders, do not hold and torque against the body of the air-pencil grinder. Hold the adapters themselves. I suspect this is another cause for tool breakages, where users are using the body of the air-pencil grinder like a wrench handle. Don’t do this! There are reviewers who have cited that the air-hose coupler included in the kit is not the U.S. standard interface. The one that came with mine is compatible with and correct for all my U.S. standard air compressor equipment. The kit comes with a set of file head grinders in duplicate. The redundancy is nice as the ultrasonic oscillations can wear off even diamond grit in a short time. I use all variety of parallel round files with this air-pencil grinder after cutting their shanks (handles) to shorter lengths. I even use the grinding bits for sharpening chainsaw links in this air-pencil grinder, and the ones with the more coarse grit will trim away even hard steel with surprising speed. For $58, this air-pencil grinder is a great value that does the job of equipment priced 10X greater. At its very affordable price, I would just buy another one if this one breaks. However, with the right maintenance and care, as described above, I suspect this air-pencil grinder will last a long time. I’m really impressed with this air-pencil grinder. It’s been immensely useful to me right out of the box as a fine grinding tool. Used properly, it does in minutes on hard steel what would take days for me to grind manually / by hand. Remember that it is an air-pencil grinder and not an air-chisel or bench grinder and it will serve you well.

### ⭐⭐⭐⭐⭐ Review
*by T***H on 25 March 2024*

This is what I've needed for quite some time. The short stroke is great for detailed work and the variable rate is useful as well. The only downside is the spacing of the slot is just a bit too wide to hold a blade for cutting rather than sanding. As a sander it is amazing!

### ⭐⭐⭐⭐ Review
*by N***Y on 22 February 2021*

Great for deburring detail cuts in aluminum sheet parts. Makes a boring miserable job somewhat more tolerable. Note: the air coupler provided won't fit any coupling you can easily buy but it's a straightforward matter to replace the provided air hose with a standard airbrush supply hose. You can buy them here on Amazon for $10 or less.

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-23*