A tumble shot blasting machine normally runs on round cast steel shot. Most cleaning work uses sizes S170 to S330 (about 0.4–1.2 mm); the exact size depends on the part material and contamination.
Angular steel grit wears the rubber belt and turbine blades faster, so it is used only when needed, in a soft grade and mixed with shot.
Quick Summary: Choosing Abrasive for a Rubber Belt Tumble Machine
- Standard choice: cast steel shot graded to SAE J444 / ISO 11124-3.
- Common sizes: S170–S330.
- Standard hardness: usually 40–50 HRC.
- Grit: only for a rougher profile, mixed with shot.
- Aluminium and stainless parts: stainless steel shot.
What Types of Abrasive Work in a Tumble Shot Blasting Machine?
A tumble shot blasting machine throws abrasive with a turbine wheel, not compressed air, so it needs a heavy, recyclable metallic abrasive.
Why Is Steel Shot the Standard Choice?
Steel shot is round, so it cleans by impact rather than cutting. It removes rust, scale and foundry sand with less belt and turbine wear than grit, and it is recovered and reused many times.
When Should You Use Steel Grit?
Steel grit is angular and gives a sharper anchor profile. Because it clearly increases wear in wheel blast machines, use the softest grade, mixed with shot.
Which Parts Need Stainless Steel Shot?
On aluminium, zinc die castings, and stainless parts, carbon steel shot can leave iron particles that later turn into rust spots. Stainless steel shot avoids this.
Why Not Use Sand, Glass Bead or Aluminium Oxide?
They are lighter and more brittle than steel, break down under turbine impact, and raise the dust load. They belong in compressed-air cabinets.
How Do You Choose the Right Shot Size?
Shot size balances impact energy against coverage. Larger shot hits harder; finer shot has far more particles per kilogram, so it covers faster and leaves a smoother finish.
| Size (SAE J444) | Approx. particle range | Typical use (general guide) |
|---|---|---|
| S170 | 0.42–0.71 mm | Thin pressed parts, light rust |
| S230 | 0.60–0.85 mm | General cleaning, fasteners |
| S280 | 0.71–1.00 mm | Heat-treatment scale, forgings |
| S330 | 0.85–1.20 mm | Foundry sand, heavy scale |
Why Do Belt Holes and Part Threads Matter?
In a tumble shot blasting machine, shot drains through the perforated belt, so it must pass the holes freely while parts stay larger than them. Very fine shot can lodge in threads.
Why Does Shot Hardness Matter?
Standard steel shot is usually 40–50 HRC. Harder shot cleans faster but breaks down sooner and wears parts more, so set the separator to remove broken particles.
Steel Shot vs Steel Grit: Which Suits a Rubber Belt Machine?
| Criterion | Steel Shot | Steel Grit |
|---|---|---|
| Shape | Round | Angular |
| Surface effect | Cleans by impact, smoother finish | Cleans by cutting, rougher profile |
| Belt and turbine wear | Lower | Higher |
| Threaded and thin-edged parts | Suitable | Use with care |
| Use in tumble machines | Standard | Limited, as a mix |
Steel Shot Pros and Cons
- Pro: Low equipment wear, long media life, safe for delicate parts.
- Con: Less sharp profile than grit; oily or wet parts can cause clumping.
How Is Shot Flow Managed in the Strong Makine LTK Series?
Each Strong Makine tumble shot blasting machine has one 320 mm, 6-blade turbine. Shot flow is 100 kg/min on the LTK-100 and 130 kg/min on the LTK-300; maximum part weight is 4 kg and 8 kg.
The elevator collects the shot, the separator removes dust and broken particles, and clean shot returns to the turbine. To keep this loop efficient:
- Top up lost shot in small, regular amounts.
- Set the separator for your shot size.
- Check turbine blades and the belt periodically.
What Should Buyers in Poland, Romania and Austria Check?
Buyers in Poland, Romania and Austria usually source abrasive from local or EU suppliers. Keep the specification clear:
- Specify the grade (e.g. S230, ISO 11124-3 or SAE J444) on every order.
- Ask for test data on hardness and size.
- Tell us your grade: the separator is set for it at commissioning.
- Check compliance: machines for Poland, Romania and Austria need CE marking; Regulation (EU) 2023/1230 applies from 20 January 2027.
Is Abrasive Selection Different in a Hanger Shot Blasting Machine?
The basics are the same: a hanger shot blasting machine is also wheel-driven. But parts hang on hooks and never rub against each other or a belt, so a shot-grit mix suits welded structures and large castings more easily. The Strong Makine AK series uses 325–400 mm turbines with 100–240 kg/min flow each.
5 Steps to Choose the Right Abrasive
- Identify the part material: steel, cast iron, aluminium or stainless.
- Define the contamination: light rust, scale or foundry sand.
- Set the target: cleaning only, or a profile before painting.
- Check thread, hole and thin-edge sensitivity.
- Run a trial blast and assess it against ISO 8501-1 cleanliness grades.
Share your part material and contamination with the Strong Makine technical team for a recommendation, see LTK data on our Tumble Shot Blasting Machines page, or request a quote via the contact form.
Frequently Asked Questions – FAQ
Lastik tamburlu kumlama makinesinde kum kullanılabilir mi?
Hayır. Kum türbin çarpmasında hızla kırılır, yoğun toz üretir ve geri kazanılamaz. Türbinli makinelerde çelik bilye gibi metal aşındırıcılar kullanılır.
Bilye ne zaman değiştirilmeli veya tamamlanmalı?
Bilye genellikle toptan değiştirilmez. Aşınan ve kırılan taneler separatörde ayrılır, eksilen miktar düzenli olarak yeni bilyeyle tamamlanır. Temizlik süresi uzuyorsa, çalışma karışımının boyut dağılımı kontrol edilmelidir.
Çelik bilye ile çelik grit karıştırılabilir mi?
Evet, bazı uygulamalarda karışım kullanılır. Lastik tamburlu makinede grit oranı sınırlı tutulmalı ve düşük sertlikte grit seçilmelidir.
Alüminyum parçalar hangi bilyeyle kumlanır?
Paslanmaz çelik bilyeyle. Karbon çelik bilye yüzeyde demir kalıntısı bırakıp sonradan lekelenmeye yol açabilir.
S230 bilye kaç milimetredir?
SAE J444’e göre S230’un nominal boyutu 0,6 mm’dir; tane aralığı yaklaşık 0,60–0,85 mm’dir.
People Also Ask – PAA
What is the best shot size for tumble blasting?
No single size fits all. S230–S280 is a good start for general cleaning; confirm with a trial blast.
Does grit wear out the rubber belt?
Yes, faster than shot, so it is used sparingly.
Is harder shot more economical?
Usually not. Standard-hardness shot is more balanced; harder shot breaks down sooner.
How can I reduce shot consumption?
Correct separator settings, regular top-ups, sound turbine blades and filter maintenance in your hanger shot blasting machine or tumble shot blasting machine all cut consumption.
| Written by: Strong Makine Technical TeamStrong Makine was founded in Konya, Türkiye, in 2023 by founders with about 20 years of shot blasting experience. Our engineers design and build hanger shot blasting, tumble shot blasting, and sheet and profile shot blasting machines.Sources: SAE J444 – Wikipedia · ISO 11124-3:2018 · Abrasive blasting – Wikipedia |
If you enjoyed our article titled “Which Abrasive Is Used in a Tumble Shot Blasting Machine?“, visit our News page for more content.
Contact us for information about Strong Makina.