Vertical Fine Boring Machine T7220B/C
The T7220B is a vertical fine boring machine used mainly to bore accurate holes in cylinder bodies and engine sleeves, and other accurate holes of the same class. It carries a table longitudinal and latitudinal moving device and a workpiece fast centring device, so the spindle is brought onto the bore centre quickly ra...
What This Machine Does
The T7220B is a vertical fine boring machine used mainly to bore accurate holes in cylinder bodies and engine sleeves, and other accurate holes of the same class. It carries a table longitudinal and latitudinal moving device and a workpiece fast centring device, so the spindle is brought onto the bore centre quickly rather than dialled in by hand on every part. Both models bore to a maximum diameter of 200 mm and a maximum depth of 500 mm, with 710 mm of spindle travel, a spindle speed range of 53 to 840 rev/min and a spindle feed range of 0.05 to 0.20 mm/rev. The distance from the spindle axis to the carriage vertical plane is 315 mm. The T7220C adds milling: it fine bores the same accurate holes in cylinder bodies and engine sleeves and also mills the cylinder surface, using a 250 mm milling cutter head with 315 mm optional, and takes a maximum milling area of 850 x 250 mm or 780 x 315 mm. Both machines bore, mill, drill and ream.
Why Buyers Choose This Machine
- Bores accurate holes in cylinder bodies and engine sleeves to 200 mm diameter and 500 mm depth
- 710 mm of spindle travel covers deep bores without repositioning the workpiece
- Spindle speed range of 53 to 840 rev/min lets the operator match speed to bore diameter and material
- Fine spindle feed of 0.05 to 0.20 mm/rev for the finish cut on a precision bore
- Workpiece fast centring device removes the slow hand dial-up on every block
- T7220C option adds surface milling with a 250 mm cutter head, so boring and decking happen on one machine
- Table longitudinal and latitudinal movement reaches hole positions across the part without re-clamping
Where Vertical Fine Boring Machine T7220B Earns Its Place
Problems It Solves
- Accurate large-diameter holes cannot be held on a general-purpose drill press
- Deep bores need spindle travel that a short-stroke machine does not have
- Setting the bore centre by hand on every block wastes skilled operator time
- Sending the block to a second machine for decking loses the reference established at boring
- A single spindle speed forces a compromise across a range of bore diameters
Who It Is For
- Engine rebuild shops boring blocks and sleeves in house
- Diesel and industrial engine repair shops working to 200 mm bore diameters
- Machine shops offering precision hole boring as a subcontract service
- Distributors supplying engine reconditioning equipment into export markets
Application Scenarios
- Reboring engine cylinder bores up to 200 mm diameter
- Fine boring engine sleeve bores after a block has been sleeved
- Milling the cylinder surface on the T7220C after the bores are finished
- Boring other accurate holes in workpieces that need engine-grade hole accuracy
- Drilling and reaming holes in the same setup as the boring work
Technical Detail
Technical Features
- Vertical fine boring construction for cylinder bodies and engine sleeves
- Table longitudinal and latitudinal moving device
- Workpiece fast centring device
- Spindle travel of 710 mm
- Spindle speed range 53 to 840 rev/min
- Spindle feed range 0.05 to 0.20 mm/rev
- T7220C milling cutter head of 250 mm with 315 mm optional
- Boring milling drilling and reaming on one machine
Specifications
| Machine type | Vertical fine boring machine (T7220C with milling) |
|---|---|
| Models | T7220B / T7220C |
| Max boring diameter | 200 mm (both models) |
| Max boring depth | 500 mm (both models) |
| Spindle travel | 710 mm |
| Spindle speed range | 53 to 840 rev/min |
| Spindle feed range | 0.05 to 0.20 mm/rev |
| Distance spindle axis to carriage vertical plane | 315 mm |
| Diameter of milling cutter head | T7220C 250 mm, 315 mm optional |
| Max milling area (L x W) | T7220C 850 x 250 mm (780 x 315 mm) |
| Operations | Boring, milling, drilling, reaming |
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
- Boring
- Fine boring
- Milling
- Drilling
- Reaming
Quality Control
- Bore diameter and depth checked on a test piece against the 200 mm and 500 mm ratings
- Spindle speed verified across the 53 to 840 rev/min range
- Feed verified across the 0.05 to 0.20 mm/rev range
- Table longitudinal and latitudinal movement accuracy checked before painting
- Machine run in and test bored in our assembly workshop before packing
Customisation Options
- T7220B for boring only or T7220C where surface milling is also needed
- 315 mm milling cutter head specified in place of the standard 250 mm head on the T7220C
- Standard and optional accessory sets selected from our accessory list
- Supply voltage frequency and operating language set to your market
How It Compares With the Alternatives
| T7220B against T7220C | The T7220B fine bores; the T7220C does the same boring and also mills the cylinder surface with a 250 mm cutter head, so the block is decked without moving machines |
|---|---|
| XAIMC TX series vertical fine boring and milling machines | The TX series is offered in TX1500 TX2150 and TX2500 sizes for longer work; the T7220 is the fixed 200 mm bore 500 mm depth machine |
| Boring on a general-purpose vertical mill | A general mill can hold a boring head but does not have the 710 mm dedicated spindle travel and fine 0.05 to 0.20 mm/rev feed range this machine is built around |
Running the Machine
Step 1
Clamp the cylinder body or sleeve on the table
Step 2
Bring the spindle onto the bore centre with the fast centring device
Step 3
Set the table longitudinal and latitudinal position for the hole to be bored
Step 4
Select a spindle speed within 53 to 840 rev/min for the bore diameter and material
Step 5
Set the feed between 0.05 and 0.20 mm/rev, using the lower end for the finish pass
Step 6
Bore the hole within the 200 mm diameter and 500 mm depth rating and check size
Step 7
On the T7220C change to the milling head to face the cylinder surface
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Questions About Vertical Fine Boring Machine T7220B
What is the largest bore the machine will take?
Maximum boring diameter is 200 mm and maximum boring depth is 500 mm, on both the T7220B and the T7220C.
What is the difference between the T7220B and the T7220C?
The T7220B is for fine boring. The T7220C also mills the surface of the cylinder, with a 250 mm milling cutter head and 315 mm as an option, over a maximum milling area of 850 x 250 mm or 780 x 315 mm.
What spindle speeds and feeds are available?
Spindle speed range is 53 to 840 rev/min and spindle feed range is 0.05 to 0.20 mm/rev on both models.
Which accessories are standard and which are optional?
The machine ships with a standard accessory set and further items are available as optional accessories. Send us the work you plan to do and we will list exactly what is included in your quotation.
Does it drill and ream as well as bore?
Yes. The machine can be used for boring milling drilling and reaming.
What voltage is it supplied at?
We set supply voltage and frequency to your market. Confirm your shop supply when you place the order.
What are your payment and trade terms?
FOB CFR and CIF. Payment is 30 percent by T/T on order and 70 percent before shipment, or an irrevocable L/C at sight.
Request a Quote on the Vertical Fine Boring Machine T7220B
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.