Long video with lots of content, see timeline below description.
We ask ourselves (at least I ask myself) “Is it me making these inaccurate parts or is it the machine?” As a hobby machinist it’s likely me. However understanding what your machine is capable of or just knowing its weaknesses is a key to success in any shop.
I invested a lot of time to determine where my machine was accurate and where it had some weakness. Knowing that gives me the confidence to move forward knowing what I (and the machine) is capable of.
For my lathe it was a combination of inherent tolerance limitations and wear in the carriage ways.
Timeline:
4:00 checking lathe level across ways
10:40 what? My flat ways aren’t level?
15:14 checking longitudinal level
18:36 measuring wear along the ways off the carriage
22:00 first indications of wear identified
23:45 second indication of wear
26:30 using tailstock ways as reference to test for wear
31:08 spindle test - center
32:00 spindle test - nose
32:55 spindle test - end play
34:20 spindle base plate
35:25 Tailstock spindle horizontal
37:15 Tailstock spindle vertical
38:45 tailstock alignment check
39:54 chuck face
41:10 chuck jaws
41:50 chuck perimeter
42:18 setting up test bar
44:45 tailstock alignment with test bar
48:25 set up for test cuts
51:00 1” test cut
52:25 3” test cut
54:20 12” test cut
101:57 wrap up and conclusion
Негізгі бет Measuring accuracy of a metal lathe & Leveling, test bar, & other techniques to identify wear points
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