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General Bobcat Skidsteer Forum
630 Skid-By-Wire
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<blockquote data-quote="peebeeaitch" data-source="post: 81555" data-attributes="member: 8318"><p><u><strong>WARNING: THIS IS PRETTY SHOCKING (REALLY)</strong></u></p><p>Ok, so this morning I wanted to work on the links from the servo box to the control block. I needed to measure to hole through the shaft so picked up the plastic digital caliper I had bought from that super el-cheapo tools shop that has a nautical theme in its name.</p><p>Luckily I've got a bit of feeling for dimensions so when I measured the hole diameter and it came back as 246.3mm I knew there was something wrong. Zero'ed the caliper and again I measured, this time the diameter was -16.1mm, which in itself was interesting. No matter what I did I could not get a repeatable reading. This is the setup:</p><p><img src="http://www.thesouthpole.co.za/bobcat/BloodSweatAndTears/20141226_131251.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p>In the middle centre one can see the little hole I was trying to measure. To get there I needed to maneuver the caliper in and down past the leadlight. Same on the way out to get the reading.</p><p>After a lot of screwing around trying to figure out what was going on I had a brainwave and moved the leadlight some distance away. Suddenly all readings were repeatable!</p><p>So this is the WARNING: BE CAREFUL WHEN USING CHEAP CALIPERS NEAR MAINS FREQUENCY, the mains may actually change the reading. Unbelievable. Note: I then went and got my expensive Mitutoyo it did not suffer from this insanity. Imagine wanting a little light to check a reading and the reading changes! And also, my bigger el-cheapo stainless caliper suffers from random zeroing of the origin depending on the speed one opens and closes the jaws.</p><p>So, I am now going to purchase two Mitutoyo's to complement the one I have.</p></blockquote><p></p>
[QUOTE="peebeeaitch, post: 81555, member: 8318"] [U][B]WARNING: THIS IS PRETTY SHOCKING (REALLY)[/B][/U] Ok, so this morning I wanted to work on the links from the servo box to the control block. I needed to measure to hole through the shaft so picked up the plastic digital caliper I had bought from that super el-cheapo tools shop that has a nautical theme in its name. Luckily I've got a bit of feeling for dimensions so when I measured the hole diameter and it came back as 246.3mm I knew there was something wrong. Zero'ed the caliper and again I measured, this time the diameter was -16.1mm, which in itself was interesting. No matter what I did I could not get a repeatable reading. This is the setup: [IMG]http://www.thesouthpole.co.za/bobcat/BloodSweatAndTears/20141226_131251.jpg[/IMG] In the middle centre one can see the little hole I was trying to measure. To get there I needed to maneuver the caliper in and down past the leadlight. Same on the way out to get the reading. After a lot of screwing around trying to figure out what was going on I had a brainwave and moved the leadlight some distance away. Suddenly all readings were repeatable! So this is the WARNING: BE CAREFUL WHEN USING CHEAP CALIPERS NEAR MAINS FREQUENCY, the mains may actually change the reading. Unbelievable. Note: I then went and got my expensive Mitutoyo it did not suffer from this insanity. Imagine wanting a little light to check a reading and the reading changes! And also, my bigger el-cheapo stainless caliper suffers from random zeroing of the origin depending on the speed one opens and closes the jaws. So, I am now going to purchase two Mitutoyo's to complement the one I have. [/QUOTE]
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