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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Difference btwn mill and mill-drill?
Hello,
I'm developing an interest in doing some of my own (light) machining work... last time I messed w/ non-handheld metalworking tools (other than a drill press or bench grinder) was on the lathe and forge back in high school, so my level of experience is pretty close to nil. What is the difference btwn a 'mill' and a 'mill-drill'? I presume a 'mill' is a vertical mill such as I can find in Enco or Grizzly or other importer's catalogs... and I have a fair-to-middlin' idea of what a drill press is... so what distinguisheds a 'mill-drill' and what are the pros and cons of one? Thanks, nuk -- I know more than enough *nix to do some very destructive things, and not nearly enough to do very many useful things. |
#2
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Difference btwn mill and mill-drill?
"Jerry Foster" wrote:
I used to have a mill-drill and I got a lot of work out of it. Then I got a Bridgeport and the difference was amazing. It was like swapping a battered Yugo for a Cadillac... Jerry I don't have the room for a full-size mill, and used machine tools are not very plentiful in the Atlanta area, I was thinking of the Jet JVM-836 knee mill. Does anyone have long-term experience with this machine? (I wonder if any home-useful machinery will come on the market when the GM and Ford plants close?) -- Email reply: please remove one letter from each side of "@" Spammers are Scammers. Exterminate them. |
#3
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Difference btwn mill and mill-drill?
"nuk" wrote in message ... Hello, What is the difference btwn a 'mill' and a 'mill-drill'? I presume a 'mill' is a vertical mill such as I can find in Enco or Grizzly or other importer's catalogs... and I have a fair-to-middlin' idea of what a drill press is... so what distinguisheds a 'mill-drill' and what are the pros and cons of one? A mill is what a mill-drill tries to be. Typically, a milling machine is much heavier, much stiffer, and generally more precise. There may be additional features on mills that are typically not available on mill-drills. Most mill-drills have only a quill feed for the vertical direction -- like a drill press. By contrast, a vertical milling machine typically has a knee that can lift the entire table up in addition to the quill feed. Other possible differences include the ability to zero-set the various dials, to adjust the gibs, to lock the motion in any of the three axes, power feed, speed ranges, etc. A mill-drill will not be able to do the heavy-duty precision cutting that a true milling machine can. For a hobbyist, some of these differences may not matter. There is, however, a key difference between the two machines. Mills use collets, such as R8, 3C, B&S, and other collets and special end mill holders, arbors, etc. The typical mill-dril, like drill presses, has a Morse (#2 or #3) taper spindle. That spindle is not designed to take significant side load. It is designed to take load in the direction of the spindle axis. Collets and tooling (e.g., tool holders, arbors, etc.) are also available for Morse taper tools. Now for the most important difference. What holds the collets in? In milling machines, the collet is held in place by a drawbar that screws into the back of the collet and therefore pulls the collet shut and tight. Some mill drills have a drawbar for the collets. Some do not. A mill drill without a collet drawbar, in my opinion is not much better than a drill press with a good XY table. The end will will, under any significant load, screw into the work and thereby pull the entire collet out of the spindle. This is the main reason why milling on a drill press is so limiting. I would reject any mill-drill that did not have a collet drawbar. Boris -- ------------------------------------- Boris Beizer Ph.D. Seminars and Consulting 1232 Glenbrook Road on Software Testing and Huntingdon Valley, PA 19006 Quality Assurance TEL: 215-572-5580 FAX: 215-886-0144 Email bsquare "at" earthlink.net ------------------------------------------ |
#4
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Difference btwn mill and mill-drill?
Boris sez: "...The typical mill-dril, like drill presses, has
a Morse (#2 or #3) taper spindle. That spindle is not designed to take significant side load...." Not quite right, Boris. Every mill-drill I've seen advertised features an R-8 spindle; they are designed to withstand the side forces of milling. Mill-drills are true milling machines, although they lack a lot of the moves and features of knee mills. Bob Swinney |
#5
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Difference btwn mill and mill-drill?
"Robert Swinney" wrote in message ... Boris sez: "...The typical mill-dril, like drill presses, has a Morse (#2 or #3) taper spindle. That spindle is not designed to take significant side load...." Not quite right, Boris. Every mill-drill I've seen advertised features an R-8 spindle; they are designed to withstand the side forces of milling. Mill-drills are true milling machines, although they lack a lot of the moves and features of knee mills. Well, maybe you haven't seen some of the cheapo's advertized. I've seen several that use MT taper and that do ***not*** have a collet drawbar. Conversely, I've never seen a mill-drill with an R8 spindle that did not have a collet drawbar. My point was to warn a newby about mill-drills that have only an MT taper, without a drawbar, and depend on luck (or crazy glue?) to hold the collet in. Boris -- ------------------------------------- Boris Beizer Ph.D. Seminars and Consulting 1232 Glenbrook Road on Software Testing and Huntingdon Valley, PA 19006 Quality Assurance TEL: 215-572-5580 FAX: 215-886-0144 Email bsquare "at" earthlink.net ------------------------------------------ |
#6
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Difference btwn mill and mill-drill?
"Rex B" wrote in message ... Has no one mentioned the round-column mill-drill issue? Most mill-drills under $1000 use a round main column, which will allow the head to move side-to-side by a small amount as it raises or lowers. If you are lined up on a hole to drill, then have to raise the head to change a tool, you have to re-center your cutter. Most real mills have a dovetail column which stays centered as it goes up and down. Good point. I overlooked that one. Boris -- ------------------------------------- Boris Beizer Ph.D. Seminars and Consulting 1232 Glenbrook Road on Software Testing and Huntingdon Valley, PA 19006 Quality Assurance TEL: 215-572-5580 FAX: 215-886-0144 Email bsquare "at" earthlink.net ------------------------------------------ |
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