Dr.Al
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- 2,570
- Location
- Gloucestershire, UK
My old (home-made) tail-stock DRO was getting more and more temperamental:
It was made from a cheap digital caliper and the body was held in place with two 20 mm diameter neodymium magnets. It worked really well for several years, but the magnets seem to be slipping every now and again now and hence I'd lost a bit of faith in it. The display was also glitching every now and again (even with a fresh battery), so I had the impression that the calipers were on the way out.
I found a second-hand digital caliper (with a nice big clear display) for not a lot of money so I bought it and promptly attacked it with the angry grinder to remove the jaws and the tail end of the scale:
I also hacked out the corner of a bit of aluminium and magicked it into a little bracket:
I then winced a bit as I drilled and tapped an M6 hole in the top of the tailstock. With the bracket held in place with a countersunk screw and the calipers held in place with an M2.5 screw (into the hole that used to have a knurled locking screw in it), there should be no chance of the caliper body moving.
The new one is metric only, which also has the big advantage in my opinion that there should be no chance of it accidentally being switched into antediluvian units. I've lost count of the number of times I pressed the "in/mm" button on the old calipers, but there wasn't a single time when I deliberately pressed the button to switch into inches. Every time I pressed it was because it had accidentally (presumably either the button getting knocked or a software glitch) switched into inches and I wanted to put it back into the proper mode. Like my posh Mitutoyo metric-only ones, this one shouldn't suffer from that problem.
I've also shortened the rear of the caliper scale, which means I don't have to take the calipers off to get to the oil hole:
It was made from a cheap digital caliper and the body was held in place with two 20 mm diameter neodymium magnets. It worked really well for several years, but the magnets seem to be slipping every now and again now and hence I'd lost a bit of faith in it. The display was also glitching every now and again (even with a fresh battery), so I had the impression that the calipers were on the way out.
I found a second-hand digital caliper (with a nice big clear display) for not a lot of money so I bought it and promptly attacked it with the angry grinder to remove the jaws and the tail end of the scale:
I also hacked out the corner of a bit of aluminium and magicked it into a little bracket:
I then winced a bit as I drilled and tapped an M6 hole in the top of the tailstock. With the bracket held in place with a countersunk screw and the calipers held in place with an M2.5 screw (into the hole that used to have a knurled locking screw in it), there should be no chance of the caliper body moving.
The new one is metric only, which also has the big advantage in my opinion that there should be no chance of it accidentally being switched into antediluvian units. I've lost count of the number of times I pressed the "in/mm" button on the old calipers, but there wasn't a single time when I deliberately pressed the button to switch into inches. Every time I pressed it was because it had accidentally (presumably either the button getting knocked or a software glitch) switched into inches and I wanted to put it back into the proper mode. Like my posh Mitutoyo metric-only ones, this one shouldn't suffer from that problem.
I've also shortened the rear of the caliper scale, which means I don't have to take the calipers off to get to the oil hole: