Adding the Auger. Step two of a DIY record.Posted: November 11, 2012
It may seem like a small bite but step two actually requires some machining and tweaking to get correct. In this step I am going to add the auger to the pipe assembly I have already built. To do this I need to support the auger with bearings so the shaft will be cantilevered in the pipe. The auger should not touch the pipe and needs to be centered in the pipe, at least within a reasonable distance. To do this I cut some 1 x 2 square tubing and then drilled holes on the Bridgeport using the Digital Readout to measure the distance so that the bearings would fit perfectly. These particular bearings are an oil impregnated bronze bushing in a pillow block configuration. The pillow block configuration is aluminum which makes machining the pillow block easy. Here’s a picture of the key way which I machined into a piece of 1″ cold rolled. If you have the choice cold rolled is much easier to work with then hot rolled for shafts. Of course this is really not shaft stock it is round stock but it works just fine and is inexpensive.
After welding the auger onto the shaft I do the calculations to center the shaft in the pipe. To make the shaft centered I have to mill some of the pillow block bearing, as you can see in the picture I had to use a circular shim to get the auger centered in the pipe.
Finally after some adjustment you can see the end result of the auger centered in the feed pipe.