dcsipo
Diamond
- Joined
- Oct 13, 2014
- Location
- Baldwin, MD/USA
The ways serve all else might be more accurate. But "Hold that thought".
See the contradiction in that?
Does you very little good to get "pointed at" if the saddle is able to depart the line, and in pitch and yaw as well as altitude.
My Not at all humble opinion is that if you have NOT corrected the bedways?
It is not yet the time to mess with ANY other alignment.
You had it right at the first statement.
Stick to it.
Sort the bed error first.
Or you will be forever chasing your tail on all-else for lack of solid reference.
UNTIL the bed can be made true again?
All you need to do is:
- Arrange to be able to drill from EITHER the TS or carriage.
- Arrange to be able to adjust the position of the TS center POINT, regardless of TS position, hi/lo, left/right or angled.
- Compensate .. as if all you ever had was a clapped out "company owned" lathe.
Because so long as the Gods of the bedways are sidegodlin?
That is exactly what you DO have!
Chase till your headstock is embedded in your tailstock ? Worn i.e. not straight bed-ways have two impacts. One is more significant than the other. They can make the carriage move up and down and in and out, or the combination of thereof. The up and down has more to do with cutting ability and quality and some diameter-dependent size error. The in and out is a direct size error. Most of the in-out is the result of twists and most of the up-down is wear. TG is in a precarious situation because his composite measurement errors cannot be attributed to any one factor. 100% agree on getting the bed right. I would make, beg, borrow steal whatever it takes to get a Kingway thingy and qualify the bed first. No one can take a successful moonshot from the top of a house of cards.
All that said...I doubt he is getting a 0.005"/12" error form bed wear alone, there is something else going on.