Gary Lewis Posted November 3, 2020 Author Share Posted November 3, 2020 Aren't all dial calipers like this, Bill? But I think Gary's issue is that he is gaining (or losing) the more he opens them. He says above that zero is correct. Yes, I have a dial. And, I've set it to zero. But if I then set my micrometer to something like .020" and lock it the calipers will read .010". And if I set the mike to .060" the calipers will read .048". Link to comment Share on other sites More sharing options...
Gary Lewis Posted November 3, 2020 Author Share Posted November 3, 2020 Yes, I have a dial. And, I've set it to zero. But if I then set my micrometer to something like .020" and lock it the calipers will read .010". And if I set the mike to .060" the calipers will read .048". This morning I installed my ~50 year old vacuum gauge in a temp location for carb tuning. How do I know it is ~50 years old? I had it while I was in college and I graduated 51 years ago. In fact, the light I installed through the back of it was so I could strap it in that same location on our then-new '72 F250 and be able to read it at night. And, like I knew it would, it helped me tell when the metering rods come up. So I have a better understanding of what is going on. Then we took Big Blue out for a cruise, and I'm happy to say that installing the rest of the windshield trim and lowering the windshield wipers made a big improvement on the wind noise. Now the wind noise seems to be from the mirrors. But, Janey said the overall wind noise is noticeably lower. After that I installed the medium-duty radio bezel. Looks kinda like Darth Vader. But in that blank spot towards the top I'll install the Carling switch mounting bracket, shown below. Then I can mount the switches, including the one for the OX locker. Link to comment Share on other sites More sharing options...
Machspeed Posted November 3, 2020 Share Posted November 3, 2020 By the way, I had a horrible discovery today. My dial calipers LIE! As explained in the edit to the post about metering rods, I checked with my micrometer today and the metering rods are exactly what they are stamped. So now I have to replace the calipers, which I use daily. In the machinist world, those are called "very near calibers"! Link to comment Share on other sites More sharing options...
1986F150Six Posted November 3, 2020 Share Posted November 3, 2020 This morning I installed my ~50 year old vacuum gauge in a temp location for carb tuning. How do I know it is ~50 years old? I had it while I was in college and I graduated 51 years ago. In fact, the light I installed through the back of it was so I could strap it in that same location on our then-new '72 F250 and be able to read it at night. And, like I knew it would, it helped me tell when the metering rods come up. So I have a better understanding of what is going on. http://forum.garysgaragemahal.com/file/n78390/Vacuum_Gauge_Installed_-_Temp.jpg Hmmmm, the other day, I was storing and cleaning and found a NOS vacuum gauge. I believe it is smaller than the one currently in Big Blue. It is shaped like an old steering column mounted tachometer. Link to comment Share on other sites More sharing options...
Gary Lewis Posted November 3, 2020 Author Share Posted November 3, 2020 This morning I installed my ~50 year old vacuum gauge in a temp location for carb tuning. How do I know it is ~50 years old? I had it while I was in college and I graduated 51 years ago. In fact, the light I installed through the back of it was so I could strap it in that same location on our then-new '72 F250 and be able to read it at night. And, like I knew it would, it helped me tell when the metering rods come up. So I have a better understanding of what is going on. http://forum.garysgaragemahal.com/file/n78390/Vacuum_Gauge_Installed_-_Temp.jpg Hmmmm, the other day, I was storing and cleaning and found a NOS vacuum gauge. I believe it is smaller than the one currently in Big Blue. It is shaped like an old steering column mounted tachometer. John - These must a good example of the "very nearly" ones. They appear to work properly and I was pretty sure they were accurate, but the results I got on the metering rods was very confusing. Very. Then I thought "why don't you check them with a micrometer" and the truth was revealed. I wonder how many things I've made that weren't quite "right"? David - A vacuum gauge meant to be permanently mounted? Cool! Mine isn't designed for that, and its mounting is precarious - and ghetto. Oh yes, I forgot to say that I'm on the lookout for an instrument bezel that matches that medium duty radio bezel. I have one with the fog light switch holes, but it is in such good shape that I'm not sure I want to drill more holes in it to mount the gauges, as shown below. So if you come across a used one please let me know. I think that bezel is black rather than gray, but will check. Link to comment Share on other sites More sharing options...
salans7 Posted November 4, 2020 Share Posted November 4, 2020 John - These must a good example of the "very nearly" ones. They appear to work properly and I was pretty sure they were accurate, but the results I got on the metering rods was very confusing. Very. Then I thought "why don't you check them with a micrometer" and the truth was revealed. I wonder how many things I've made that weren't quite "right"? David - A vacuum gauge meant to be permanently mounted? Cool! Mine isn't designed for that, and its mounting is precarious - and ghetto. Oh yes, I forgot to say that I'm on the lookout for an instrument bezel that matches that medium duty radio bezel. I have one with the fog light switch holes, but it is in such good shape that I'm not sure I want to drill more holes in it to mount the gauges, as shown below. So if you come across a used one please let me know. I think that bezel is black rather than gray, but will check. Definitely doesn't look like "Medium Metallic Gray Weave", but if somehow it is, I know somebody who has one for sale. There's a small hole drilled through it so it's perfect for aftermarket gauges. Link to comment Share on other sites More sharing options...
85lebaront2 Posted November 4, 2020 Share Posted November 4, 2020 Yes, I have a dial. And, I've set it to zero. But if I then set my micrometer to something like .020" and lock it the calipers will read .010". And if I set the mike to .060" the calipers will read .048". Ok, you got me interested in doing some checking. I have a set of Mitutoyo dial calipers, no 537 - 110 and a nice Mitutoyo 0 - 1" micrometer no 193 - 211. I took a scrap piece of lead wire from some small electrolytic capacitors I installed on a power supply for a Polaroid TV. I measured it with the calipers and the micrometer, here are the results: First here are the two instruments: Then, calipers zeroed: And micrometer zeroed: The piece of capacitor lead: Sorry it wouldn't focus better. Caliper measurement: 0.022+" Micrometer measurement: 0.024" Â Link to comment Share on other sites More sharing options...
Gary Lewis Posted November 4, 2020 Author Share Posted November 4, 2020 Ok, you got me interested in doing some checking. I have a set of Mitutoyo dial calipers, no 537 - 110 and a nice Mitutoyo 0 - 1" micrometer no 193 - 211. I took a scrap piece of lead wire from some small electrolytic capacitors I installed on a power supply for a Polaroid TV. I measured it with the calipers and the micrometer, here are the results: First here are the two instruments: Then, calipers zeroed: And micrometer zeroed: The piece of capacitor lead: Sorry it wouldn't focus better. Caliper measurement: 0.022+" Micrometer measurement: 0.024" Shaun - I'll lay others beside this one tomorrow in good lighting and figure out what I have. But you may just have the winning hand! Bill - So something is off .001+? That's not bad, but I'd bet the micrometer is correct. Link to comment Share on other sites More sharing options...
85lebaront2 Posted November 4, 2020 Share Posted November 4, 2020 Shaun - I'll lay others beside this one tomorrow in good lighting and figure out what I have. But you may just have the winning hand! Bill - So something is off .001+? That's not bad, but I'd bet the micrometer is correct. I will too, it was calibrated every January by NNS as a personal tool and never needed adjustment. Link to comment Share on other sites More sharing options...
Gary Lewis Posted November 4, 2020 Author Share Posted November 4, 2020 I will too, it was calibrated every January by NNS as a personal tool and never needed adjustment. My Mitutoyo micrometers have been checked against my gauge blocks several times, but have never needed adjusting. Link to comment Share on other sites More sharing options...
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