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HH Roberts / Topwell 4-GL |
| The 4 1/2 Hp vector drive head is available with your choice of back geared or direct drive. Direct drive speed range 75 to 4,000 or 100 to 6,000 rpm. via belt change. Back geared ranges 15 to 750 and 75 to 6,000. Table 10" or 12" wide by 42" or 50" long Travels 32" x 16" or 25" x 16" The saddle is 22" wide, ( about 2" wider than our 3-GL ) The slideways on column and cross slide are box ways with large contact area and turcite counterslides. Hardened and ground X and Y axes with Turcite counterslide on saddle Hardened and ground table top Power feed on table Central lube The spindle can be R-8, #30, Cat-V 40 or BT-40 and Erickson 30. With the #30 and #40 spindles the bearings are improved The vector drive head is an in house development that is enjoying success as a replacement head for older Bridgeports and Bridgeport clones. Click here for details. Anilam, Acu-Rite, Heidenhain or Fagor digital readouts are optional as are full coolant systems with chip pans and side splash guards. |
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| Click here to download our knee mill catalogue. | Above is the 4-GL with the slideway chip guards removed to show the box ways on the column and the knee. The power feed is standard equipment. The Anilam digital readout shown, is an option. |
| The main differences between this model and the #3 model of the series is the saddle and knee construction. The # 4 models have a wider saddle running on box style ways, while these # 3 models have traditional dovetail ways. The column ways are also box ( or square) ways on the # 4 mills and the # 3 models have dovetail ways. The heads and tables are the same on both. | |