Posted by Janicholson on November 13, 2021 at 10:25:15 from (24.240.46.228):
In Reply to: OT Bridgeports posted by Dave H (MI) on November 13, 2021 at 09:37:09:
See my comment below. The Bridgeport mill, and its clones from other quality companies, are solid machines with no real grief, Abuse and poor maintenance are the only factors that ruin them. Almost all manually operated mills have backlash in the axis screws. A few have ball screw systems with no slop, but rare, The normal backlash (thousandths of an inch of lost motion when the axis wheel is turned) is between 10 and 25 thousandths. Backlash may be judged best in the center of the X and Y travels. that is where screw wear is going to be greatest. Normal milling is pushing the work into the oncoming cutter edges. All milling on a manual machine should be done in that direction. Climb milling can pull the work into the backlash and break tooling or ruin the part. Normal milling is the same as using a table saw on wood. Climb milling is like feeding wood into a table saw from the opposite side. Not good. Jim
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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