BJ Series Gap-Bed Lathes
The BJ series is a family of gap-bed lathes, including the BJ1630G, built to cover the whole range of rotary work a general shop meets rather than one narrow job. They perform internal and external turning, taper turning and end facing, and they drill, bore and broach grooves, so a part can often be finished without mo...
What This Machine Does
The BJ series is a family of gap-bed lathes, including the BJ1630G, built to cover the whole range of rotary work a general shop meets rather than one narrow job. They perform internal and external turning, taper turning and end facing, and they drill, bore and broach grooves, so a part can often be finished without moving it to a second machine. All kinds of flat stock and irregular shapes can be held and machined, and the through-hole spindle bore takes bar in larger diameters, with a spindle bore taper of Morse No.6 and a bore of about 77mm on the listed build. Threading covers inch, metric, module and D.P. systems, and both inch and metric dials are used on the machine, which removes the conversion step for buyers working in either measuring system. Hand brake and foot brake versions are both offered, and the machines are built for 220V, 380V or 420V supply at 50Hz or 60Hz, so the same series can be shipped to markets with different power.
Why Buyers Choose This Machine
- Inch metric module and D.P. threading covers repair and gear work in any of the four systems
- Both inch and metric dials fitted so operators from either measuring system read the machine directly
- Through-hole spindle bore of around 77mm with a Morse No.6 taper takes larger bar stock
- Gap bed lets flat irregular and large diameter work be machined without leaving the machine
- Drilling boring and groove broaching on the same setup as turning reduces part handling
- Hand brake or foot brake versions so the shop chooses how the spindle is stopped
- Built for 220V 380V or 420V at 50Hz or 60Hz to suit different export markets
Where BJ Series Gap-Bed Lathes Earns Its Place
Problems It Solves
- Converting between inch and metric dials during a job introduces errors; both systems are on the machine
- Module and D.P. threads usually require a special change gear set
- Small spindle bores restrict the bar diameter a shop can run
- Moving a part to a drilling or slotting machine for holes and grooves loses the original setup
- Large diameter and irregular work will not clear a flat bed without a gap
- A machine built for one voltage and frequency cannot be resold across markets
Who It Is For
- General engineering shops needing one lathe to cover mixed rotary work
- Repair shops working across inch and metric drawings
- Gear and worm repair work needing module and D.P. thread pitches
- Exporters supplying markets with 220V 380V or 420V supply at 50Hz or 60Hz
- Shops that want a choice of hand or foot braking for their operators
Application Scenarios
- Internal and external turning of shafts sleeves and housings
- End facing and taper turning of rotary components
- Drilling and boring holes on parts already chucked for turning
- Groove broaching in bores that would otherwise go to a slotting machine
- Bar work fed through the large spindle bore
- Machining flat stock and irregular shapes held in the gap
Technical Detail
Technical Features
- Gap bed for large diameter and irregular work
- Through-hole spindle bore approximately 77mm
- Spindle bore taper Morse No.6
- Inch metric module and D.P. thread cutting
- Both inch and metric measuring systems on the machine
- Internal and external turning taper turning and end facing
- Drilling boring and groove broaching capability
- Hand brake and foot brake versions
- 220V 380V or 420V supply at 50Hz or 60Hz
Specifications
| Machine type | Gap-bed lathe series |
|---|---|
| Models | BJ series including BJ1630G BJ1640G and BJ1660G |
| Spindle bore | Approximately 77mm through hole |
| Taper of spindle bore | Morse No.6 |
| Threading | Inch metric module and D.P. |
| Measuring systems | Inch and metric both fitted |
| Braking | Hand brake or foot brake |
| Power supply | 220V 380V or 420V |
| Frequency | 50Hz or 60Hz |
| Operations | Turning taper turning end facing drilling boring groove broaching |
Figures above are taken from the product information we hold. Send us your application and we will confirm the exact specification for the model quoted.
How It Is Built and What Can Be Changed
Operations Performed
- Turning
- Taper turning
- End facing
- Drilling
- Boring
- Groove broaching
- Thread cutting
Quality Control
- Spindle bore run-out and Morse No.6 taper seating checked on assembly
- Gap piece fit and bed alignment verified with the gap fitted and removed
- Inch and metric dial calibration checked against a measured test cut
- Thread positions for inch metric module and D.P. exercised before the covers are closed
- Brake and electrical circuit tested at the ordered voltage and frequency
Customisation Options
- Model selected from the BJ series according to swing and centre distance you need
- Hand brake or foot brake chosen with the order
- Supply voltage of 220V 380V or 420V and 50Hz or 60Hz set for your market
- Chuck steady rest follow rest and tool post package agreed before build
- Manual and machine plates prepared in your working language
How It Compares With the Alternatives
| Flat-bed lathe of the same swing | The gap lets large diameter and irregular work be machined that a flat bed would simply not clear |
|---|---|
| Lathe with metric threading only | The BJ series cuts inch metric module and D.P., so gear worm and imperial repair threads do not need a change gear set |
| Moving parts to a drill or slotting machine | Drilling boring and groove broaching on the lathe keeps the original setup and its concentricity |
| Single-voltage machines | The BJ series is built for 220V 380V or 420V at 50Hz or 60Hz, which matters for dealers selling into more than one market |
Running the Machine
Step 1
Confirm the machine is wired for your supply voltage and frequency before first start
Step 2
Level the lathe and check the bed with the gap piece fitted and bolted
Step 3
Choose the inch or metric dial system your drawing uses and stay with it for the job
Step 4
Feed bar through the spindle bore only when it is supported and guarded behind the headstock
Step 5
Select the thread system and pitch from the chart before engaging the lead screw
Step 6
Remove the gap only for large diameter or irregular work and refit it for shaft turning
Step 7
Test the hand or foot brake at the start of each shift and keep the ways lubricated
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Questions About BJ Series Gap-Bed Lathes
Which models are in the BJ series?
The series includes BJ1630G and the larger 40G and 60G builds. Tell us the maximum diameter and length you turn and we will confirm which model covers it.
How large a bar will pass through the spindle?
The spindle has a through hole of about 77mm with a Morse No.6 taper. Send us your bar diameter and we will confirm against the model you are considering.
Can it cut module and diametral pitch threads?
Yes. Inch, metric, module and D.P. threading are all available on these lathes, which is what gear and worm repair work needs.
What voltage and frequency can you supply?
220V, 380V or 420V at 50Hz or 60Hz. State your supply on the order and the machine is wired accordingly.
Is the brake hand or foot operated?
Both versions are offered. Choose the one your operators prefer when you place the order.
Can the lathe drill and bore as well as turn?
Yes. Drilling, boring and groove broaching are all within its capability, so many parts can be finished in one setup.
What are your trade and payment terms?
FOB CFR or CIF from Xi'an, with 30 percent by T/T on order and 70 percent before shipment, or an irrevocable L/C at sight.
Request a Quote on the BJ Series Gap-Bed Lathes
Send us the work you need it to do, the voltage on your site and the port you ship to. We will come back with the model, the tooling and the lead time.