Nowadays, digital calipers are very inexpensive and part of makers daily tools when designing things. It is very portable as well.
Ocassionally, we would need to use a digital height gage. I recently created 2 hemispherical parts out of ShopBot. I intend to glue them together to produce a 3" sphere. I cut them off the bandsaw with a slight extra thickness to sand off before gluing them together. But I need a precise measurement of 1.5" height on each.
Here's a list of inexpensive digital calipers.
Step 1: Creating the Base
* The base is formed by stacking 3 pcs 3" diameter disk.
* Each disk is slotted 3mm to the center. I used 3mm because this make the caliper lip snuck tightly to the base.
* Note that the caliper lip need to be slightly below the top surface.
* I put a 3" diameter acrylic on top.
Step 2: Instruction
* For many, the use of the digital height gage need no further instruction if you have used a caliper before.
* Pull the upper lip all the way to the base.
* Turn power on and/or zero it.
* Select unit: mm or inch.
* Raise the upper lip.
* Position part and slide down upper lip and read the height.
Step 3: Safety Precaution.
* As with any instrument, safety is number one priority.
* Use this setup for short and transient use. Disassemble when not in use.
* Avoid having children nearby.
* Note the pointed hard object standing up.
* Note too that the pointed hole depth measurement sliding part (when upper lip is raised) could be sticking out.
* Best is to disassemble this right after use.
* The author is not liable for any injury to anyone.
ENJOY and BE SAFE AT ALL TIMES.
Thank you for your time. Happy Holidays.