The Keltech Shop contains functioning prototype lapping and polishing
machines. It also contains auxiliary abrading support equipment including an
air compressor, compressed air dehumidifiers and filters, a vacuum pump
system, ovens, a sintering furnace, welders, a jib-crane hoist, ventilation
systems and various other shop fabrication equipment and tools. Equipment
modifications, oven curing of the island-disc abrasive adhesives, oven drying
of abrasive beads, and furnace sintering of the erodible abrasive beads take
place in the shop.
Large Commercial Ovens
There are two large Despatch LAC-1 ovens with a 250º C temperature
capability that can accommodate multiple 19” diameter abrasive island discs
for curing the phenolic adhesive. A Watlow programmable temperature control
provides multi-step temperature profiles that can be used to precisely control
the oven temperatures. Different accurate oven time-temp profiles are required
for drying “green” surface-hardened porous ceramic abrasive beads and for
curing phenolic resins used to adhesively bond abrasive beads to abrasive disc island tops. The ovens are also used to attach sapphire wafers to backing discs with wax. Vacuum is also supplied to the ventilated oven for fixturing components during processing.
Paragon Lab Furnace
A high temperature Paragon Lab Furnace with a Watlow profile-temperature controller provides precision heating environments for several different processes. One use is the furnace sintering of the porous ceramic beads that contain diamond abrasive particles. A critical time-temperature profile is ramped up slowly to 500º C and held there to complete the sintering. This is the same profile that has been used for years to produce conventional porous ceramic diamond particle abrasive beads commonly used in abrasive lapping films.
A Millermatic 200 MIG commercial welder is used for fast wire-feed welding of steel machine components. A Miller Synchrowave 250 TIG commercial welder for precision welding of small or thin component parts.
Air Compressor, Air Dryer, Vacuum Pump
The air compressor room contains a 7.5 hp Ingersol Rand compressor with an 80 gal tank, a 2 hp Bush Vacuum pump with two 7.5 gallon surge tanks with automatic controls. Also, there is a Ingersol Rand refrigerated air dryer for supplying dry and filtered air to the lapper and disc grinder air bearing spindles and to the lab room.
Steel, Aluminum and Plastic Material
There is a large supply of steel and aluminum tube, rod, plate, angle, and flat stock along with various thicknesses and types of plastic sheeting.