Johnford SDMC Series โ€“ Sliding Column Bridge Mills

The six machines in the Johnford SDMC series of heavy duty sliding double column machining centers feature a moving column and fixed table for unlimited table loads. With standard accessories the Meehanite cast iron machines weigh nearly 150,000 lbs. The machines can be configured to fulfill any large-part production requirements.

The SDMC series can be expanded from 5 meters (196โ€ณ) up to 20 meters (787โ€ณ) of X axis travel. A rugged 90หš bridge with offset Y-axis ways and a 48โ€ณ (1,220 mm) wide saddle keeps the spindle center line extremely close to the bridge for rigidity. This design also gives a full 48โ€ณ (1,220 mm) span across the Y-axis ways for optimum support of the massive headstock. The bridge and traveling head feature square box ways coated with Turcite and have been designed with diagonally arranged ribs that will help reduce the amount of distortion that can result from years of continued service.

Column traverse is accomplished via two sets of heavy duty Schneeberger linear ways under each column and twin 3.15โ€ณ (80 mm)-dia. ballscrews up to 9 meters (354โ€ณ) long in the X axis. To eliminate whip and vibration, the X-axis ballscrews are fixed and the ball nuts are spun by servo motors. SDMC bridge mills with 10 meters of X travel and larger use twin precision rack and pinion drives. The CNC synchronizes the servo motors to eliminate crabbing effect. Twin Heidenhain glass scales are standard on the X-axis to enhance positioning accuracy. W-axis capability is optional.

A spindle motor of 35 hp delivers power through a two speed gearbox. Tooling is CT-50 (HSK-100), and the machines feature a 40-tool capacity automatic toolchanger.

Specifications

Item / Model
SDMC-5000 Request a Quote
SDMC-6000 Request a Quote
SDMC-7000 Request a Quote
SDMC-8000 Request a Quote
SDMC-9000 Request a Quote
SDMC-10000 Request a Quote

X Travel (in.)

196

236

275

315

354

394

Y Travel (in.)

72 โ€“ 157

72 โ€“ 157

72 โ€“ 157

72 โ€“ 196

72 โ€“ 196

72 โ€“ 196 / 236

Z Travel (in.)

32 / 42

32 / 42

32 / 42

32 / 42

32 / 42

32 / 42

Z Travel (in.)

41.7โ€ณ

41.7โ€ณ

41.7โ€ณ

41.7โ€ณ

41.7โ€ณ

41.7โ€ณ

W Axis

Optional

Optional

Optional

Optional

Optional

Optional

Table Load

Unlimited

Unlimited

Unlimited

Unlimited

Unlimited

Unlimited

Rapids (in./min.)

472 / 787

472 / 787

472 / 787

472 / 787

472 / 787

472 / 787

Control

OiM-F

OiM-F

OiM-F

OiM-F

OiM-F

OiM-F

Spindle Taper

CT-50 (HSK-100)

CT-50 (HSK-100)

CT-50 (HSK-100)

CT-50 (HSK-100)

CT-50 (HSK-100)

CT-50 (HSK-100)

RPM (K)

6 / 8

6 / 8

6 / 8

6 / 8

6 / 8

6 / 8

Spindle (HP)

35

35

35

35

35

35

Spindle Drive

2 Speed Gearbox

2 Speed Gearbox

2 Speed Gearbox

2 Speed Gearbox

2 Speed Gearbox

2 Speed Gearbox

ATC Capacity CAT

40

40

40

40

40

40

Weight (est. lbs.)

150,000

150,000

165,000

200,000

230,000

230,000

FAQs

Can you customize X,Y, and Z travels in the Johnford DMC series?

Yes, Johnford can build machines in the DMC series with up to 240 inches in x-travel and up to 157 inches in y-travel. Johnford will also customize the DMC series with up to 2 meters of w-axis travel.

What are some examples of common parts made using bridge mills?

Weldments, molds, dies, plate work, forgings

Does Johnford have a full 5-axis head configuration?

Yes, with spindle speeds from 4,000 rpm with a 2-speed gearbox up to 20,000 rpm with an integral spindle motor.

Does the Johnford DMC series offer a solution for high speed and complex 3D machining?

Yes. Johnford offers our DMC Hi-Net series with spindles ranging from 15,000 rpm in an HSK-100A to 24,000 rpm in an HSK-63A with features such as Fanuc 31i-MB control, thermal growth automatic compensation, and Heidenhain linear scales on X, Y, and Z axes.