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| HS93:
There are some clever people on hear (and there friend's) nice work. :bow: :clap: :thumbup: :ddb: :nrocks: :ddb: Peter :ddb: :nrocks: :ddb: |
| PekkaNF:
Good job! :bow: Hope your back-ache fades away as well. PekkaNF |
| DaveH:
Phew,............ I'm glad you have sorted it out Bill, I was starting to lose my beauty sleep :lol: :lol: :lol: :beer: DaveH |
| Fredbare:
Well done Bill, excellent work. John |
| BillTodd:
Quick update: I have not had to much time to fiddle with this, but following a few tests last weekend I have found the next critical bit is the ball-slide. The ball-slide has to be tight yet slide freely for the indicator to work accurately. On this version I bonded the thrust bearing together under a pre-load (~ 50N) using Loctite. This was fine initially but, with use, started to come loose and slightly rough. To remove the play in the ball-slide while testing, I locked the Z axis motion using spacers and a spring washer (to pre-load the bearing again) . The tests showed the indicator could work well - e.g. it was really quite accurate measuring the distance between two faces However, the problem is zeroing accuracy: it does not return to 'zero' properly if moving slowly due the the roughness in the ball-slide. Today I pressed the slide apart only to find all the surfaces badly brinelled (dented by the bearing balls) - I knew this could be a problem with non-hard surfaces, but was surprised because of the relatively light loads on the bearing. So, now I'm trying to figure out how to fit standard sized hardened thrust washers to the bearing surfaces :scratch: Bill |
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