I have found that a 3/8 inch (9.5 mm) will easily hold a 10.5 mm drill bit. I don't have any 1/2 inch (13 mm) chucks on any of my drills, but I would bet they could hold a 14 mm bit.
Could you let us know what the max bit a 1/2 inch chuck will hold? For this reason, I can't understand why the 3/8 inch can't be called 10 mm. Instead of RPM, the designation could be r/min or min^-1. Until hertz catches on, I see the RPM hanging on for a bit. I wonder if the motor is designed with horsepowers in mind or if it is designed as a 200 W motor with a rough conversion to 1/4 HP. Euric PS: Here is a link to a site where the motor power is given in watts. The rest of information is in FFU: http://shop.woodcraft.com/Woodcraft/product_family.asp?family%5Fid=4902&; gift=False&0=dept%2Easp%2Cdept%5Fid%3D4067%26menu%5Fid%3D%26Tree%3D%2CDr ill%20Press&Gift=False&mscssid=016BA845B52BC47D9835E438848DFB9C -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of James Frysinger Sent: Sunday, 2003-11-30 09:56 To: U.S. Metric Association Subject: [USMA:27704] Nearly all-metric drill press I have just (finally!) setting up an $80 Delta drill press that I bought from Lowe's several weeks ago. (The hardest part was cleaning up my workshop enough to make room.) I needed two wrenches to tighten the fasteners and to install the spindle handles: 12 mm and 7 mm, respectively. I checked carefully and this was not an accidental fit. The 1/2 inch wrench provided a sloppy fit and the 12 mm wrench provided proper clearance and no more. My suspicions were confirmed when I found, later in the documentation, advice on hardmounting the drill press to a bench. It tells me to use M8x1.25 125 mm bolts, M8.5 washers, M8.5 lock washers, and M8x1.25 nuts. Alas, the chuck is a 1/2 inch chuck and the five available spindle speeds are given in "RPM" on the chart of speed limits for various bit sizes. The motor is rated at "1/4 HP" but naturally the remaining lamp and motor specifications are given in volts, hertz, and amperes. The drill press is metric in its design, apparently, though the speed guidelines and bit specifications are geared for a non-metric audience. Jim -- James R. Frysinger Lifetime Certified Advanced Metrication Specialist Senior Member, IEEE http://www.cofc.edu/~frysingj [EMAIL PROTECTED] [EMAIL PROTECTED] Office: Physics Lab Manager, Lecturer Dept. of Physics and Astronomy University/College of Charleston 66 George Street Charleston, SC 29424 843.953.7644 (phone) 843.953.4824 (FAX) Home: 10 Captiva Row Charleston, SC 29407 843.225.0805 --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.545 / Virus Database: 339 - Release Date: 2003-11-27 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.545 / Virus Database: 339 - Release Date: 2003-11-27
