In my last Drill Press Blog I had found that the taper runout was plus or minus zero, but drills in the chuck wobbled plus or minus 4 thoundths. If I drilled small holes in a piece of wood and held the piece with my fingers the piece vibrated and the hole was less than true. When I make small things, this is an issue. I went out to “Production Tool Supply” and got a “Chuck Lesson” They told me that the old key Jacobs chucks are not as precision as they might be, the new ones may or not be better but there is something better.
I purchased a Rohm Supra chuck for my drill press. Model 87103.. The capacity of this chuck is 0 to 3/8 inch. It is a keyless chuck. I was working on a lock today and had to drill 2 quarter inch holes in the bolt. With the old Jacobs chuck, I would have clamped the piece down hard. With this chuck you could feel no vibration wile drilling the holes. A great product.
The gentleman at PTS also reminded me about collett chucks. It dawned on me that I had one for quarter inch drills. My dad bought it years ago. Sadly colletts are not available for this chuck but the use of collett chucks is a good solution for accurate drilling.
For thos who wanted to see this old machine, I finally have figured out posting pictures. Dad bought in in 1947 or 48. Mary won’t let me build a new cabinet for it so it sits proudly on the cabinet he built for it.
Workshop hand me downs often can’t be replaced.
-- Bill, Michigan "People don't come preassebled, but are glued together by life"