I do agree and I have not been troubled by the less than stellar TIR of my Albrecht, though I have been troubled by occasional slippage probably due to the need for an overhaul. I was just kind of fascinated when I saw such low TIR's for keyless chucks and I do like it when a product matches or exceeds its specs. I know that with Precision Matthews, if it had been out-of-spec they would have handled it properly.Drilling does not require accuracy measured in tenths, unless perhaps you are talking about really tiny drills and/or really fussy work. I am lucky enough have quite a few very nice drill chucks, from high end makers, and they all work pretty well. If they are within .003", they are quite useful for most any work I do with a drill bit or any other tool I mount in a drill chuck. Yes, I go to the known (and tested) more accurate chucks for more fussy work, but I also go to the less accurate ones on purpose when I just want to drill holes to remove metal, quick and dirty. Even on many milling machines in our shops, the spindle accuracy can be way less than .001", and many/most drill presses can be quite poor, certainly not gaining useful accuracy from using high precision chucks. On lathes, it is not so much about the chuck accuracy, it is more about the geometry of the tail stock to the spindle when looking for better accuracy with drilling. Ultimately, if we want to get a hole to proper size and location, we will be using a drill to hog the metal, a boring tool to locate the hole accurately, and then a reamer to get it to a final accurate size -- for precision work. Drills are not by nature high precision tools, and other tools held in drill chucks typically aren't, either. Most of the time I am just reaching for a chuck that will hold the drill without it slipping, and fast, smooth, and easy for installing and removing the drills. Of course, really poor drill chucks are just trading stock...
Slippage with Albrecht chucks is almost always from contaminants in the chuck, or more likely from excessive oil in the chuck on the internal spindle threads. They don't typically really need an "overhaul,", just a tear down, proper cleaning of the existing parts, and a proper reassembly using the correct methods for an Albrecht chuck. The best reference online for going through an Albrecht chuck comes from our own "Mikey" on this forum, in this older (2009) step by step tear down and reassembly posting:I do agree and I have not been troubled by the less than stellar TIR of my Albrecht, though I have been troubled by occasional slippage probably due to the need for an overhaul.
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