CNC machine accessories / Bar feeding
Short and long bar feeders
Bar feeders for CNC lathes
LNS bar feeders load bars into the machine automatically, so your lathe keeps running unattended at the end of the shift, overnight and at weekends. We survey your machine, select the right model, install it and service it.
15
LNS models, from Ø0.5 to Ø120 mm
Ø0.5–120 mm
bar diameter across the range
1.6 m / 4 m
maximum bar length: short or long model
15 s
diameter changeover (QLS 65)
1 team
from survey to service
Basics
What does a bar feeder do?
The bar feeder stands behind the CNC lathe and pushes the bar forward through the spindle in step with the machining cycle. When a bar runs out, it removes the remnant and automatically loads the next one from the magazine. The operator only needs to refill the magazine from time to time.
This keeps the machine working at the end of the shift, overnight and at weekends, and one operator can run several machines. Guiding the bar in the spindle also reduces vibration, which means a better surface finish and longer tool life.
Applications
Fixed headstock CNC lathes
Swiss-type lathes (sliding headstock)
Small, medium and large batches
Unattended, overnight operation
Benefits
More machine time, fewer manual bar changes
One operator runs several machines
Consistent cycle time and quality
Less vibration with a guided bar
Comparison
Short or long bar feeder?
Both serve the same purpose, but each suits a different machine and production. The decision mostly comes down to bar length, batch size and the space behind the machine.
Compact
Short bar feeder
Loads bars no longer than the spindle, up to 1.6 m. It fits in a small space, and diameter changeover takes seconds.
Bar length
up to 1600 mm
Bar diameter
Ø6–120 mm
Changeover
10–15 s
Footprint
small
Ideal for
small and medium batches
For large batches
Long bar feeder
Loads full 3–4 m bars with hydrodynamic guiding. Fewer remnants, less frequent refilling, and the solution for Swiss-type lathes too.
Bar length
3–4 m
Bar diameter
Ø0.5–80 mm
Changeover
approx. 2 min
Footprint
matches the bar length
Ideal for
medium and large batches
Little space behind the machine, but need a longer bar? A short bar feeder with a spindle extension can feed bars up to 1.6 m.
Selection
Four questions that decide the model.
The right bar feeder starts from the machine and the part being made. We look at these during the on-site survey before recommending a model.
01
What machine is it?
Fixed or sliding headstock, which make and which control. This tells us which family fits and what interface the machine needs.
02
What bars do you run?
The diameter range, the bar profile (round, hexagonal, square) and the material determine the guide channel and the spindle liners.
03
How large are the batches?
For large batches and long shifts a long bar feeder is more economical; for frequent changeovers and tight spaces, a short one.
04
At what speed?
At high speed, bar guiding is decisive: spindle liners and hydrodynamic guiding reduce vibration.
FAQ
What people usually ask about bar feeders.
If your question is not on the list, write or call us. With the machine type and bar diameters we can answer quickly.
Send a questionWhich machines suit a short one, and which a long one?
Swiss-type lathes and large batches usually call for a long bar feeder; conventional CNC lathes, small and medium batches or limited space often favour a short one. We give our final recommendation after surveying the machine.
Can it be fitted to an older machine?
On most CNC lathes, yes, provided the control handles the bar feeder signals. Before quoting, we check compatibility from the machine drawings and the control.
What is a spindle liner, and when is it worth using?
A spindle liner matches the spindle bore to the bar diameter, so the bar does not vibrate even at high speed. If the bar is much thinner than the spindle bore, it is almost always worth using.
How long does it take to change to another diameter?
It depends on the model. On the QLS 65 short bar feeder, diameter changeover takes 15 seconds; on most long bar feeders, a partial changeover takes about 2 minutes. The Express 346 evo sets itself up once the diameter is entered.
Who installs and services it?
Our own service team installs it, interfaces it with the machine and trains the operators. Spare parts come from stock, and if there is a fault we also help by phone and remote access.
Which machines can it be interfaced with?
LNS bar feeders can be interfaced with machines from most lathe builders, for example Mazak, Doosan, Okuma, DMG MORI, Haas, Citizen, Star and Tornos. We handle the interfacing and wiring.
Do you overhaul old bar feeders?
Yes. We also overhaul and upgrade older LNS bar feeders, and supply wear parts from stock.
How much does a bar feeder cost?
The price depends on the model, the bar diameter range and the interface the machine needs. Send us the machine type and the bar diameters, and we will send a quote.
From the manufacturer
Detailed technical data and the full LNS bar feeder range on the manufacturer's website.
Related products
Good to pair with.
Which bar feeder fits your machine?
Send us your machine model, bar diameters and bar length, and we'll make a recommendation within 1 day.
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Contact
Prevotex Hungary Kft.
Vegyész utca 19–25, 1117 Budapest, Hungary
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