Model D3500/67 Mill Gear Drive Unit
| Original manufacturer | GDW, SKET |
| Used for | Used for 2.6 m dia. x 13 m mills, designed to replace Sunderland gear drives. Gear drives with gears: 3677.21 and 3677.22 (800 kW); 3677.94 (1,000 kW) |
| Rating / Motor rating | 800 kW (surge power 1,600 kW) |
| Design factor / Factor KA | 1.6 through 2.0 as per assumptions and 1955 design method (no DIN, no TGL existing) |
| Driving speed | 750 rpm |
| Transmission ratio | 36.874285 |
| Bearings fitted | Plain journal bearings |
| Weight of gear drive unit | approx. 50,000 kg |
| Rehabilitation capability of the original gear drive | New gears of converted configuration; welded helical gears. Renewal of plain journal bearings |
Replacement with Three-Stage Gear Drive with Antifriction Bearings:
Model DD3500/84 – W Gear Drive
| Rating | 1,000 kW (surge power 2,000 kW) |
| Factor KA | 2.0 (designed to TGL 10545, 10546) |
| Driving speed | 750 rpm |
| Transmission ratio | 36.5812 |
| Bearings fitted | Antifriction bearings |
| Weight of gear drive unit | approx. 46,100 kg |
Replacement with Newly Developed Vakoma 2535V-1/2 Gear Drive Unit
With hardened and ground teeth. Designed to DIN 3990 for factor KA = 2.0
Note:
Plain journal bearings to Drg.No. 3677.93. Vakoma Gear drive for potential replacement is being project-engineered. Foundation needs to be modified. An advanced auxiliary drive with a jaw clutch having a positioning mechanism could be supplied. A membrane clutch for connection to the mill could be accommodated in the design.
Model D3500/67 Gears
| Original manufacturer | GDW, SKET |
| Used for | Spare parts for Model D3500 gear drive with 9 and 14 module millimetres double helical teeth (potential replacement of the Sunderland teeth) |
| Rating / Motor rating | 800 kW (surge power 1,600 kW) |
| Design factor / Factor KA | 1.6 through 2.0 as per assumptions and 1955 design method (no DIN, no TGL existing) |
| Driving speed | 750 rpm |
| Transmission ratio | 36.874285 |
| Bearings fitted | Plain journal bearings |
| Weight of gear drive unit | approx. 54,000 kg |
| Rehabilitation capability of the original gear drive | New, re-designed welded helical gears would be supplied. The helical gears and the coupling star are a shrink-fit. A two-piece cover is necessary for the output shaft! |
Replacement Variant
Available as gears for installation in existing non-worn casings. It would be appropriate to renew the plain journal bearings as well. Drawing numbers of the gears 3677.21 and 3677.22
 |
Model D3500/67 gearDownload PDF-file |
Model D3500/84 Gears
| Original manufacturer | GDW, SKET |
| Used for | Spare parts for Model D3500 gear drive with 14 and 20 module millimetres double helical teeth (reinforced design compared with D3500/21) |
| Rating / Motor rating | 1,000 kW ( surge power 1,800 kW) |
| Design factor / Factor KA | 1.6 through 1.8 as per 1984 design methods (TGL 10545; 10546) |
| Driving speed | 750 rpm |
| Transmission ratio | 36.658726 |
| Bearings fitted | Antifriction bearings |
| Weight of gear drive unit | approx. 54,000 kg |
| Rehabilitation capability of the original gear drive | New, re-designed welded helical gears would be supplied. The helical gears and the coupling star are a shrink-fit. |
Replacement Variant
Available as gears for installation in existing non-worn casings. It would be appropriate to renew the antifriction bearings as well.