Movement of compound slide was not so good. So I tried lapping according to an article I found on the net. I used metal polish as an abrasive. I did not want to scatter abrasive around on the lathe. So I removed the slide and fixed to a work bench. Frankly speaking this lapping job was quite hard.


After a slight lapping, I checked the sliding surfaces and found the tapped locations were all swollen. It seemed the order of machining was not proper. Grinding sliding surface should be done after tapping.


Dove tail surfaces were also rough.


After a couple of hours lapping, I found the jib was not straight at all. I could not imagine this when I started lapping and did not check it.


The warp of the jib was so large. I tried to grind down by a diamond stone. The warp seemed too large to remove by stone. So I bent back the jib on a vice and filed down. Then I finished it by diamond stone.


It took more than one hour to achieve this.


The bottom of the slide ground nearly flat, but some parts (for example arrowed part) were not ground at all. However I was sick of lapping and gave it up.


Hand scraping was almost gone on the process of lapping, but the scraped surfaces were all evenly lapped. This means scraped parts were reasonably flat before lapping.


I assembled the slide and found it felt much better than before. Before I had to pinch two handle bars to turn the dial. Now I can turn the dial by using only one handle bar.



inserted by FC2 system