Equipment comparison
Hi-Tech Diamond All-U-Need 6 vs 8: Which Flat Lap Size Fits Your Work?
Compare usable working radius, consumable cost and workpiece size before paying for a larger flat-lap platform.
Compare both sizes
See the products before the deep dive
Start with the shortlist, then use the guide below to decide which tradeoffs actually matter for your batch.
Hi-Tech Diamond All-U-Need 6-inch Rock/Mineral
Beginners who want a compact flat-lap machine for shaping, smoothing and polishing cabochons and flat rock surfaces.
6 in lap; 2-1/4 in working radius Check Price on Amazon
Hi-Tech Diamond All-U-Need 8-inch Rock/Mineral
Lapidary users who want the All-U-Need workflow with more usable disc area for larger cabochons, flats and broader workpieces.
8 in lap; 3-1/4 in working radius Check Price on AmazonBetter when most work stays comfortably inside the smaller grinding radius.
Better for wider flats and larger pieces that feel crowded on the 6-inch platform.
Side-by-side specifications
| Decision | 6-inch | 8-inch |
|---|---|---|
| Working radius | 2-1/4 in | 3-1/4 in |
| Motor | 1/4 hp variable speed, 800–3,400 rpm | 1/4 hp variable speed, 800–3,400 rpm |
| Machine footprint / weight | 10 x 10 x 12 in; about 9 lb | |
| Best reason to choose | Smaller pieces and lower disc spend | Larger workpieces and more surface area |
Best for: Beginners who want a compact flat-lap machine for shaping, smoothing and polishing cabochons and flat rock surfaces. Best for: Lapidary users who want the All-U-Need workflow with more usable disc area for larger cabochons, flats and broader workpieces.Hi-Tech Diamond All-U-Need 6-inch Rock/Mineral
Why it made the shortlist
Know before buying
Hi-Tech Diamond All-U-Need 8-inch Rock/Mineral
Why it made the shortlist
Know before buying
Use your normal workpiece—not the machine diameter—to decide
If your usual cabochons, backs and flats stay inside a 2-1/4 in usable radius, the smaller machine avoids paying for larger consumables forever.
If you repeatedly need more room to keep larger pieces flat and moving smoothly, the extra working radius becomes meaningful.
What does not change between 6 and 8
The motor platform, compact 10 x 10 x 12 in housing, roughly 9 lb machine weight and core rock/mineral accessory sequence are shared. Both use the same style of water kit, and the manufacturer notes that the platform can be converted between sizes by matching the spray shield and disc size.
The included abrasive sequence
→
→
→
→
The hidden difference is replacement-disc cost
The machine decision repeats every time you buy consumables. Larger discs use more material and usually cost more. Buy the 8-inch because your pieces require the surface—not because the larger number sounds more professional.