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16 000 kg or 12 000 kg: matching the boring mill to your frame
Two boring mills share a 1 800 x 2 500 mm table. The WRD15 carries 16 000 kg on a 160 mm spindle and the WHQ13 carries 12 000 kg on a 130 mm spindle, so the weight of your frame decides which one it goes on.
A welded machine frame reaches the boring mill with its weight already fixed by the drawing. That weight picks the machine before the travel does. The hall runs two TOS Varnsdorf horizontal boring mills, and both have a 1 800 x 2 500 mm table. The clamping surface is the same, so the footprint of the frame does not separate them. The load rating and the spindle do.
Which table carries your frame: 16 000 kg or 12 000 kg
A frame heavier than 12 000 kg goes on the WRD15, whose table is rated to 16 000 kg. A lighter frame can go on either machine, and the travel and the spindle then decide.
The weight that counts is the weight on the table. That is the finished frame plus the angle plates, blocks and clamps the setter bolts on. Take the frame weight from the part list on the drawing, then leave room for the fixtures. A frame close to the WHQ13 rating is planned on the WRD15 from the start. That avoids a change of machine once the frame is already in the queue.
The rating is not a formality. The table travels and indexes under the spindle with the full load on it. A table loaded past its rating is not used, and the frame waits for the larger machine. For heavy welded machine frames, the 16 000 kg rating decides which queue the frame joins and when it is machined.
Does the frame fit the travel in one clamping
The WRD15 travels 6 200 x 3 000 x 1 600 mm, so every feature inside that envelope is machined without moving the frame. The WHQ13 travels 3 500 x 2 500 x 1 600 mm, which suits shorter frames, bases and brackets.
One clamping keeps every bore on the same datum. The hole pattern then matches the drawing without the error a second setup adds. A frame longer than the WRD15 travel goes to the W200 HINR, with 8 000 x 3 000 x 1 500 mm of travel. That keeps a long base frame on one datum from end to end. How a long frame is set up and bored on the table is covered in machining large welded frames.
| TOS Varnsdorf WRD15 | TOS Varnsdorf WHQ13 | |
|---|---|---|
| Table | 1 800 x 2 500 mm | 1 800 x 2 500 mm |
| Table load | 16 000 kg | 12 000 kg |
| Spindle | 160 mm | 130 mm |
| Travel | 6 200 x 3 000 x 1 600 mm | 3 500 x 2 500 x 1 600 mm |
The same figures, with the lathes and the gear hobbing machine, are listed under horizontal boring mill capacity for the whole machine shop.
Which spindle your bores need: 160 mm or 130 mm
Deep bores and heavy facing cuts go on the WRD15 and its 160 mm spindle. Shorter bores and lighter cuts run on the WHQ13 and its 130 mm spindle.
A thicker spindle bends less when it reaches out of the headstock into the part. A bore deep inside a frame then holds its size and position along its length. Bearing seats, shaft bores and gearbox mounts are where the difference shows. A shallow bore in a thin flange gains nothing from the larger spindle and runs on the WHQ13 without loss. Mark each bore with its diameter, its depth and its datum on the drawing. The planner can then match it to a spindle before the frame is welded.
The weld itself can help the bore. Frames in S235 or S355 are welded in plate up to 40 mm thick within our structural steel welding scope. A boss thick enough for a deep bore can therefore be welded into the frame instead of bolted on.
From welded frame to machined frame, step by step
The steps below follow the frame through the hall in the order they happen.
- Weld the frame in its jig to the sequence planned for distortion control in a welded frame.
- Measure the welded frame with the FARO measuring arm to find how much stock each machined face carries.
- Lift the frame by crane onto the 1 800 x 2 500 mm table of the chosen mill.
- Clamp and align the frame to the datum faces named on the drawing.
- Bore and face every feature that shares a datum in the same clamping.
- Measure the machined features again, as in the dimensional inspection before paint.
After the last check the frame moves on to blasting and paint, with the machined faces protected. The crane driver lifts it off the table only once the inspector has signed the measurement report.
What the drawing needs so the mill can be chosen
Send the frame weight and a bore list with the drawing, and the mill is chosen before the price is set. Without the weight, the planner has to assume the heavier machine.
The bore list gives each bore its diameter, depth, tolerance and datum. The weight should be the finished frame, not the plate ordered. The rest of the checklist for material, tolerances and finish is in what a drawing needs for a quotation.
Weigh the frame on paper first. If it comes out over 12 000 kg, note it on the enquiry. Do the same if any bore is deep enough to need the 160 mm spindle. The frame is then planned on the WRD15 from the start, and the quotation carries the right machine time.
FAQ
What is the heaviest frame your boring mills take?
The WRD15 table is rated to 16 000 kg, fixtures included. Anything heavier is discussed from the drawing before a price is given.
Are the two boring mill tables different sizes?
No. Both tables measure 1 800 x 2 500 mm; the load rating and the spindle are what differ.
Which mill takes a frame longer than the WRD15 travel?
The W200 HINR, with 8 000 x 3 000 x 1 500 mm of travel, takes frames beyond the WRD15 envelope.
Does a shallow bore need the larger spindle?
No. Shallow bores and light cuts run on the WHQ13 and its 130 mm spindle, and the 160 mm spindle is kept for deep work.
Send the drawing, the frame weight and the bore list to request a machining quote, and the mill is chosen before the price.