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| BillTodd:
:( Well it kinda works... To test it I set it up in the 4 jaw on my lathe so I could access the accuracy using the lathe's Sony DRO (good to a few microns) I zeroed the dial then used the DRO's touch sensor to set the DRO to zero for the 'depth' (Z axis) test. Then wound the carriage in by 2.000mm (see test1.jpg) . The dial reading was about 50um short. This was not unexpected as I don't know how accurate the DTI is or how accurate my 45° tapers are, and absolute accuracy it is not too important for an edge detector. Then I zeroed the DTI (at 2mm in) to test the XY plane using the cross-slide (see test1a.jog). I zeroed the cross-slide DRO just as the tool post hit the probe (couldn't get the touch sensor in a position to test this so there could be a small error) . Then moved the cross-slide in 2.000mm. This time the DTI read 80um short (meaning there is about 80um movement in the X+ direction, i.e towards the indicator, before the DTI moves) (pic test 2a.jpg). I re-zeroed the DTI and tested it in the three other orientations (X-, Y+, Y-) see test2.jpg. It seemed reasonably consistent perhaps 20um out in the Y- direction (could be chucking run-out or a gravity effect?). All of which makes me wonder if this is ever going to be accurate enough to be useful :doh: ????? There is only the tiniest play in the ball slide (I chose to bond the parts together this time instead of screwing them) and the fit of the other parts would be difficult for me to improve on, so I'm now not sure if I can get this to work :scratch: |
| Fredbare:
I have have been following this from the beginning, and admire your skill, and tenacity, hope you succeed, and finish this to your high standards. John |
| Divided he ad:
Bill, Sounds like you're in for a bit of "fun" testing!? I'm sure you'll come up with something.... even if it's a good hard launch at the wall! :bugeye: Nah. You'll get it :dremel: Ralph. |
| BillTodd:
I'm tempted to go back to my original prototype idea, which was a tipping beam. It is inherently non-linear and needs careful scaling to be anywhere near correct, but still it might be better than what I've got ATM :scratch: |
| PekkaNF:
--- Quote from: BillTodd on May 07, 2012, 10:12:41 AM ---I'm tempted to go back to my original prototype idea, which was a tipping beam. It is inherently non-linear and needs careful scaling to be anywhere near correct, but still it might be better than what I've got ATM :scratch: --- End quote --- Three prongs/legs? Or a cunning plan to get all level and square? PekkaNF |
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