Induma Bridgeport Style Knee Mill W/ Dro No Reserve!!

US $9400

  • Hemet, California, United States
  • Jun 9th
This is an Induma knee mill, similar to a bridgeport but with thicker castings and apparently a better machine. Its made in Italy and is pretty beefy. It has an Acu-Rite digital DRO with 0.0005" resolution on the x-axis and 0.0002" resolution on the y-axis. The motor is a 3/4hp 90V DC brushed motor with a adjustable speed control that can run off 120V or 220V single phase AC. I have it setup to run off 120V right now. Besides the electronic speed control there are the usual two cone pulleys and a belt and back-gear which give you 8 speed ranges. Unlike other similarly priced knee mills, this one is not worn out and is a tight, smooth machine. The precision surfaces and critical precision spindle bearings appear to be in excellent condition. This machine is ready to make great parts. Much of the ways still show strong scraping marks and very little wear. I did some tests and its as good or better than factory specs (which are in the manual) so far: -Spindle runout 0.0003 (3 tenths) measured at R8 taper with Mitutoyo DTI -It can easily achieve a 32uinch Ra finish fly cutting, 3" dia, on 6061-T6. (see pic) -X and Y axis backlash 0.015" -X axis squareness with movement is about 0.0003" (3 tenths) over 12", about 0.0005" over full movement of X axis. -Bed flatness with X axis movement is about 0.0003" over 12". The upper spindle bearing has just been replaced. I just COMPLETELY disassembled this mill to every last teeny piece, cleaned everything meticulously and reassembled. No more grease anywhere, its all oil now, and clean. During this process I've discovered what minor odds and ends should be replaced, such as a couple small springs that have worn out, some screws, etc..all easy to get to and cheap. Other things included: Acu-rite II DRO (x-axis has 0.0005" resolution, y-axis 0.0002" resolution) Operations and parts manuals 14 R8 collets An R8 drill chuck A 6" non-asian vise (beat up but the fixed jaw is cast into the main body, which is nice). A home-made collet rack for the collets. A mix and match of hold down bolts, stairs, nuts, studs, etc.. The main column casting has a few cracks. The ones on the upper part of the casting appear to have been repaired professionally either by welding or brazing. The machine was painted after those repairs, and the paint is still intact over the repairs. I believe the machine had not been painted in at least 10 years, so that makes those repairs at least that old, and they seem to be doing fine. The one lower on the foot has not been repaired, but I believe I located the ends of the cracks (using a pocket microscope), and I drilled holes to stop them. The unrepaired cracks on the foot are more of a mystery but I dont think they are fresh. They were a bit rusted and dirty, so they've probably been around for a long time. Im not sure how the cracks occured, there does not appear to be impact damage on any part of the machine, including the column casting. Apparently someone thought the machine was worth spending quite a bit of time and money to have the cracks repaired. The machine is in my garage, under power. You can test it out and bring whatever equipment you want (or use mine) to measure it and inspect it. This machine weighs about 2400 lbs. We can come up with a plan to transport it. Worst case it can be taken apart into pieces and loaded a couple at a time, even into a small vehicle (I did it in a Jeep Cherokee for everything but the column casting, which I did with the cheapest uhaul truck). But if you have another way you want to do it we can discuss. If you want to see the machine and/or have any questions, just email me! I'm a machinist so ask away!

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