It doesn't fit! "Not happy! Jan!!"

[Kody]

I ordered a new drill chuck for my bench drill last week as the original had died. (Yes, they will die when used by my son!) At long last, the new chuck arrived and with much joy and anticipation of a great weekend working on the trailer frame, I zoomed out to the garage to fit the new chuck. What a disaster!
The original chuck fitted onto a tapered spindle. No probs, I had simply measured the largest diameter of the taper, measured the angle of taper as best I could and searched the internet for information of the taper standards. I found a table of the different tapers and my drill seemed to be a "B16". Now, I haven't a curlew what a "B16" is in regard to taper per foot, the angle of taper or what the "B16" stands for.
The chuck came and I tried to fit it onto the drill spindle. No-go!!! The diameter on the nose of the spindle is a few "thou", about 0.010, too small and the chuck wont lock onto the taper.
I have pulled the spindle out and now it's in the lathe for some "technical adjustment". It looks like there is just enough material on the spindle nose to turn the correct taper. What a pain!!! As we say down here, "Not happy! Jan!!" --- to understand this phrase, you need a full knowledge of Strine, ie, Australian language. I hope I don't have to build up the spindle nose with a few weld passes, I would get very excited if I had to do that,
I have had the small bench drill for about 35 years or more. The standard tapers for fitting drill chucks were Jarno and Brown and Sharpe, I don't know what has happened to the normal engineering standards but whatever it is, it stinks! If I want something done correctly, I have to do it myself!

Kody

[Kody]

I have chomped down a yummy dinner, explained to my mate in town that he is not to touch his computer or try and fix it. Played games with the fur kid and went back to the garage. After some precise measuring and a little bit of guess work, I adjusted the top slide on the lathe to cut the correct taper. The drill spindle was held in the three jaw chuck and supported at the end using a "Dead Center". A few very careful passes with a nice sharp tool and the chuck was tried for size. It was showing that it was an almost perfect fit. I polished the tapered section and then brought out the super sensitive equipment to check the taper for diameter and angle. This equipment is no more that a felt tip pen. I applied lots of lines along the mating surface and tried the chuck for size and fit. It needed a couple of "thou" polished off the larger dia. of the spindle. I did the felt pen trick again and it showed a perfect fit.
All the parts of the drill were then cleaned and greased and reassembled. The chuck was given a little "bump" with a piece of wood to set it at "home".
The switch was flicked on and the chuck spun absolutely true. I mounted the 6.5mm drill and drilled the first hole in the 2x2x1/8 angle to begin the construction of the trailer.
What I find so annoying is that doing all this extra fitting has been, I believe, absolutely unnecessary. Anyone else buying a similar chuck or tool and finding it didn't fit could/would be in dire straights. I am so thankful to God that I have the skills and tools to do the things I do. What I am so thankful for most of all is the patience I have and my sense of humor. Even my beloved sweetie is amazed at my patience when things go horribly wrong.
I can now spend my time very joyfully, building our TD

Kody

[pete42]

The only tappered drill chuck I have used were the ones in our maintenance shop
we had adapters that were added to ones with to small of a shank.
I don't remember ever seeing a new chuck in the 41 years I worked there.
Isn't it rewarding to know that you have the ability to fix the problem, and a workshop
with the tools to do the job.

glad your problem is fixed and now on with the trailer, you know the good stuff.........

pete

[mary and bob]

Isn't that referred to as a Morse taper, and I thought they were a standard taper other than different sizes, or diameters. Where was your chuck made, some third world country with no machining tolerances or inspection methods. It's so hard to get quality parts!!

[Kody]

The Morse Taper is the taper on the spindle that extends out from the end of the drill chuck. Drills that are used in a machine shop are made with a Morse Tapered extension and this in turn fits into a tapered socket be it in a lathe or a drilling machine. Morse Taper shanked drills are usually bigger than 1/2" dia. but can be as small as 1/8" dia. and upward. The Morse Taper allows the drill to be very quickly attached to the lathe, drill or even a milling machine. The Morse Tapered spigot is fastened to the drill chuck by a special taper machined as a male taper on the spigot and a corresponding female taper in the end of the drill chuck. This taper is such that the two parts, the chuck and the spigot, lock together extremely tightly and very precisely. Drill chucks are also fitted to drilling machines by having the chuck screw onto the drill using a fine pitch thread. The most common thread is 1/2" UNF. Chucks that are threaded onto the drill often undo when the drill is reversed under a load. Screw-on drill chucks are almost always used on hand tools. I have never seen a screw-on chuck used in a lathe or on a bench drilling machine. Hope this helps.

Kody

[eamarquardt]

http://www.woodstockint.com/Products/D2931/

Maybe this chuck will fit.

Gus