Fabrication Method Pumps
Glass saws are used to split glass blocks. The cooling fluid is fed through a pan fitted under the saw blade. The band saw for glass has a similar structure to the band saws used for processing metal and wood.
Cylindrical grinding machines are used to grind pieces of glass into round shapes. The workpiece spindle and the grinding wheel spindle normally run parallel. The coolant is supplied by a pump fitted in the machine base.
If large volumes of similar parts are being machined, lapping with a coarse abrasive is often replaced by a curve generation. The term "milling" is commonly used in the optical industry for this, although it is actually a grinding process.
Automatic fine-lapping and polishing machines are also called "overarm machines". The drive force is transferred by means of a horizontal main shaft via clutch discs to the vertical eccentric spindles. Parallel to that, there are basin spindles which end in basins above the machine bed. The excess lapping and polishing material is collected in these basins.
After lenses are lapped and polished, the lens edge is machined on a centering machine. The basic centering machine consists of a bearing block with a spindle running in conical slide bearings carrying the centering chuck. The lens is cemented to this chuck and centered by a reflected image. The lens edge, which is out of true, is grinded on a brass plate. The coolant can be supplied to multiple machines simultaneously by a single pump.
Polishing and grinding particles are very sedimentary. Spandau Pumpen provides the following solution: a mixing paddle fastened to a metric thread at the end of the shaft which ensures continuous mixing of the pumped fluid (see illustration above). This effectively prevents the depositing of particles and hardening.
Immersion pumps for highly contaminated fluids
Immersion pumps for slightly contaminated fluids