Grinding the bore of the multi-tooth clutch used in some Hendey lathe headstocks
The compound-slide feed-screws were made not from turned but precision-ground bar: here a blank is being finished to size
Size-grinding a bar that would eventually become a lathe leadscrew
An alloy-steel gear in the final stages of heat treatment, just prior to quenching
A view of the Heat Treatment Department with two oil-burning furnaces in the background; a recording cabinet for the Leeds-Northrup Home-electric furnace and, in the foreground, a deep oil-quenching tank.
An lathe apron in the final stages of assembly.
Lathe headstocks in the assembly area. In the foreground, handing from a chain block, is a "cradle", a sub-assembly containing the speed-change gears and a sleeve pinion that drove the main spindle though a multi-tooth clutch. At the second bench the cradle has been bolted into place and the main spindle can be seen partially inserted.
A complete headstock being tested on what was known in the factory as the "run-off block"; this was a device that put the headstock under a working load and allowed the inspector to assess whether any noise or vibration fell within acceptable limits.
An inspector checks to make sure that the inner and outer ways of a lathe bed are in perfect alignment
The underside of a saddle being scraped to mate perfectly with the bed ways
Long straight edges were used to check the accuracy of the scraping process
Hendey lathe beds were not finished by grinding but by skilled and patient craftsmen using the old and long-trusted method of hand scraping.
"After many prior inspections of individual components a screwcutting gearbox comes together as a complete unit".
A view down the assembly floor looking towards an American flag on far wall. In the immediate foreground are lathe beds fitted to their cast-iron pedestals as delivered from the sub-assembly department ready drilled to accept headstocks and carriages.
A view down the assembly floor from the American-flag end. At this stage the lathes are nearly complete.
An apron backplate being checked with a dial indicator to ensure that the holes for the power-feeds' shaft are perfectly in line.
Checking the size of the bored hole (to hold the main spindle bearing) in the rear of a headstock casting
Machined gear blanks are checked by an inspector for uniformity of diameter, width of face and bore sizes. Although a micrometer is being used for the benefit of the photographer the "fixed" and "go-no-go" plug gages on the bench would have been the normal tools employed
A 0.0001" reading dial gage is used to check the bearing bore