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Thread: leveling device
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18th April 2012, 09:09 PM #1Member
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leveling device
Anorak Bob posted these photos in this thread - https://www.woodworkforums.com/f65/fe...sories-151221/
which I didn't want to hijack. So my question is - how is this better than just sitting the level on the cross slide and winding the carriage back and forward? Further, how is the traditional method of sitting the level on parrallels (for V bed lathes) and moving that set up repeatedly from end to end during the twist elimination process, better than the cross slide idea? I'm thinking that it is the cross slide that carries the tool so it should be better than actually measuring the bed level directly, but that's not what the experts say so I'm obviously missing something again. Just curious as to what it is.
BTW - thanks Anorak bob for your prolific photo posting. I always love em!
Graham
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18th April 2012 09:09 PM # ADSGoogle Adsense Advertisement
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18th April 2012, 09:26 PM #2Philomath in training
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Graham,
I guess there are several features of this that are worth noting. For a start the level used is a pretty good one - I think it was something like 0.05mm per meter. This precision is very sensitive to slight inclinations. If you lathe was perfectly level then sitting on the cross slide might do, but this set up lets you compensate for any over all out of level that may be in the lathe.
The relatively narrow base width also means that local wear can be detected, where as on the carriage the wear might be bridged, and either not seen or seen but with less accuracy as to it's location or extent.
Measuring the V's with two dowels like that means that the working surfaces are being measured. Using a couple of parallels (depending on how they were placed) may mean that you are measuring an un-worn area.
The last point is that that set up is very flexible and can be adjusted to suit a number of machine geometries without lots of bits everywhere.
Michael
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18th April 2012, 09:33 PM #3
Hi,
I understand all parts of the jig except for one of the two bolts on the back on the jig. One is clearly right through the jig and rests on the rear way, but is the other one for?
Ewan
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18th April 2012, 09:37 PM #4Philomath in training
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I can't recall that feature being explained, but I'd say it was a handle so that you weren't disturbing the adjusting bolt.
Michael
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18th April 2012, 11:22 PM #5SENIOR MEMBER
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19th April 2012, 12:55 AM #6Member
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So my question is - how is this better than just sitting the level on the cross slide and winding the carriage back and forward? l
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19th April 2012, 09:01 AM #7Distracted Member
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That tool is for machine survey, but you can also use it to level your lathe by placing it at the unworn ends of the bed. I had used the cross slide method, but when I made a tool similar to the one shown, I found errors in overall level I couldn't detect before. However that's with a very worn lathe so for most machines the cross slide method of levelling may be fine.
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