630-DT Horizontal Machining Center: 1200 kg on a 630 mm Pallet with a BT50-190 Spindle
Horizontal machining centers earn their keep when a part has features on several faces and you would rather not keep moving it. The 630-DT sits in the middle of that market: a 630 × 630 mm table rated for 1200 kg, a BT50 spindle with a φ190 taper nose turning to 6000 rpm, and 1100 mm of X travel.
Spec sheets are easy to misread. A table load figure decides whether you can clamp a cast gearbox housing plus its fixture and still have margin. A spindle speed decides whether you are hogging steel or finishing aluminium. Travel decides whether the part fits at all. Here is what the 630-DT offers, and how it compares with the machines either side of it in the BONANZA range.
630-DT specifications at a glance
| Parameter | 630-DT |
|---|---|
| Table size | 630 × 630 mm |
| Max. worktable load | 1200 kg |
| X-axis travel | 1100 mm |
| Y-axis travel | 900 mm |
| Z-axis travel | 1000 mm |
| X-axis rapid traverse | 18 m/min |
| Y-axis rapid traverse | 15 m/min |
| Z-axis rapid traverse | 15 m/min |
| Spindle taper hole | BT50 Φ190 |
| Spindle speed | 6000 rpm |
| Machine weight | 12000 kg |
What a 1200 kg table load actually buys you
This is the number buyers misjudge most often. The 1200 kg is not the workpiece allowance, it is everything sitting on the table: the casting, the tombstone or angle plate, the clamps, and the fixture. A 700 kg iron housing on a 250 kg tombstone leaves roughly 250 kg of headroom. A 1000 kg weldment with heavy fixturing does not fit that budget, and a shop usually discovers this after the machine is already on the floor.
On a 630 mm pallet, 1200 kg is generous. It is the reason this machine takes box-type parts, valve bodies and mould bases that a lighter 630 would refuse. If your parts sit closer to 400 or 500 kg, the HTMC630-VI uses the same footprint with a 500 kg limit and shorter travels.
BT50 with a φ190 nose, capped at 6000 rpm
A BT50 taper with a φ190 nose is a heavy spindle. It takes the large face mills and boring bars that pull real power in steel and cast iron, and the taper mass absorbs interrupted cuts better than a smaller interface.
The 6000 rpm ceiling is a deliberate trade. It is plenty for a 125 mm shell mill in carbon steel, for boring a valve body, or for inserted drills in cast iron. What it is not built for is high-speed aluminium work with 6 mm end mills at 15000 rpm, where a smaller taper and a faster spindle win. If most of your work is aluminium finishing, this is the wrong machine.
Travels of 1100 / 900 / 1000 mm and the parts they cover
The envelope is nearly cubic, which suits parts that are chunky rather than long. X travel of 1100 mm with a 630 mm pallet means the spindle can cross the full table and still reach past centre, so a feature on the far side of a large casting is reachable without re-clamping.
In this class the pallet normally indexes in 90° steps, which turns a single 630 mm table into four machined faces in one setup.
Z travel of 1000 mm sets how far the spindle reaches into a part and how much clearance you have for long tool assemblies.
Where the 630-DT sits in the horizontal range
BONANZA builds a full ladder of horizontal machining centers, and the models are easiest to tell apart by the table they carry:
- TH500 is the smallest: 1200 × 600 mm table, 800 kg load, BT40 φ150 spindle, faster rapids at 24 / 18 / 24 m/min, 7200 kg. Light parts, quick cycles.
- HTMC630-VI carries a 630 × 630 mm table at 500 kg with 1050 / 800 / 850 mm travels and the same BT50 φ190 spindle at 6000 rpm.
- 630-DT keeps the 630 mm table but lifts the load to 1200 kg and stretches travel to 1100 / 900 / 1000 mm, on a 12000 kg frame.
- 800S-DT steps up to an 800 × 800 mm table, 2000 kg, BT50-45° spindle and 1300 / 1000 / 1000 mm travels, at 15500 kg.
- 1000S-DT takes a 1000 × 1000 mm table and 4000 kg, with 1800 / 1000 / 1300 mm travels and a 3000 rpm spindle for heavier, slower cuts.
- TH1400S and TH1600S are the large end: 5000 kg and 10000 kg table loads, 2000 rpm and 1500 rpm spindles, machine weights of 19500 kg and 24000 kg.
One note: the HMC630II-ZT publishes the same table, load, travel and spindle figures as the 630-DT, so ask BONANZA how the two configurations differ.
Shop floor notes before you request a quote
At 12000 kg this machine needs a proper foundation and a plan for rigging. BT50 holders are heavy and cost more than BT40 equivalents, so budget a starter set.
Coolant deserves early thought too: deep bores in valve bodies and hydraulic blocks are much easier with through-spindle coolant, and it is cheaper to specify at order time than to retrofit.
Keep 18 m/min rapids in perspective as well. On a 12000 kg horizontal moving a loaded pallet, positioning and clamping time sets the cycle, so a long cut is more likely to be your bottleneck than a slow move.
Frequently asked questions
What size workpieces fit the 630-DT?
The table is 630 × 630 mm with a maximum load of 1200 kg, covering the workpiece and all fixturing. Axis travels are 1100 mm in X, 900 mm in Y and 1000 mm in Z. Box-type castings, valve bodies and mould bases in the 500 to 900 kg range sit comfortably; heavier parts want a larger table such as the 800S-DT or 1000S-DT.
What is the difference between the 630-DT and the HMC630II-ZT?
On published specifications the two are identical: 630 × 630 mm table, 1200 kg load, 1100 / 900 / 1000 mm travels, BT50 φ190 spindle at 6000 rpm, 12000 kg machine weight. The difference is in configuration and options, so send BONANZA your drawings and fixture concept and ask which frame suits your work.
Is 6000 rpm enough for steel and cast iron work?
Yes, that is what this spindle is designed for. BT50 with a φ190 nose takes large face mills and boring bars, and 6000 rpm covers the surface speeds you need in carbon steel, alloy steel and cast iron with carbide tooling.
Does the machine support pallet changing?
Confirm this for your order. Elsewhere in the range the 800-DT documents a reserved interface for an exchange worktable, and it should be specified at quotation stage.
Talk to BONANZA about your parts
Picking a horizontal from a spec table alone is how shops end up with the wrong size machine. Send BONANZA the drawings and a rough fixture idea and you get a straight answer on whether the 630-DT horizontal machining center fits, or whether the wider travels of an 800S-DT or the heavier table of a 1000S-DT serve you better. Browse the full horizontal machining center series, then request a quote.