00:00welcome to another video from Matt's
00:02metalworking in this video I'll be
00:04showing you how to use and read an
00:07imperial dial caliper a caliper can take
00:10measurements in four different ways
00:12using the outside jaws inside jaws depth
00:16probe and using the step a dial
00:20indicator basically takes place at the
00:22vernier scale making the caliper quicker
00:24and easier to read while requiring less
00:27skill or time this isn't as easy as
00:30compared to a digital caliper but there
00:33also isn't any electronics or battery
00:35upkeep just like any precision measuring
00:39equipment this should never be dropped
00:41always kept clean and free of any
00:43foreign contaminants and check
00:45periodically to ensure its accuracy now
00:49for the parts and what they do first is
00:51the outside jaws which is used to
00:54measure the outside diameter length
00:56width or thickness of an object next is
00:59the inside jaws used to measure the
01:01inside width of a slot groove or hole or
01:04the inside diameter of a bore here is a
01:08depth probe or rod used to measure a
01:11groove slot step or hole the beam or
01:15sometimes referred to as the bar is the
01:18frame of the caliper that is stationary
01:19and houses the depth probe the measuring
01:23scale which determines the measurement
01:25is in this case how many inches and
01:27tenth decimal place a reference edge to
01:31determine where the measurement sits in
01:33the scale the dial indicator which
01:36determines the hundredths and
01:37thousandths decimal places the face can
01:40be rotated in order to zero the dial
01:43here is a fine adjustment thumbwheel to
01:46achieve accuracy when setting up or
01:48adjusting the feel or drag when
01:50measuring an object then the thumb grip
01:53for quick or large adjustments while
01:56it's hard to see here there is a track
01:59which needs to be clean at all times
02:01as a dial indicator gear runs on this
02:04above the dial is a thumbscrew lock to
02:07hold the caliper measurement in place
02:09and then the step measurement surface
02:12used to measure steps grooves or
02:14differences in surface elevation now to
02:17give a little tour of some of these
02:19parts here's the depth probe next is the
02:23step measurement surfaces you can also
02:27see the inner and outer measuring jaws
02:31the rotational face on the dial
02:42adjustment wheel and the thumb screw
02:46lock always ensure the surface you are
02:49measuring is clean and free of any
02:51imperfections or dirt also make sure the
02:54measuring points on the caliper is clean
02:56as well as this can affect the accuracy
02:58of her readings close the jaws and zero
03:01the dial face if need be now taking the
03:05first measurement using the outside jaws
03:07on the scrap piece of aluminum holding
03:11the piece down and the jaws with mild
03:12pressure or drag so the part is still
03:15movable but not clamped between the jaws
03:18looking at the reference edge as you can
03:21see if it hasn't passed the one inch
03:23mark but it has passed the 500-thousand
03:28reading from the dial the needle is at
03:3179 giving us a final measurement of 579
03:36thow or thousandths of an inch
03:39now using the step measurement push the
03:43step of the movable part of the caliper
03:45on the high part and then push down just
03:49to give you a view on the backside for a
03:51better understanding
03:56again the reference edge hasn't passed
03:58the full one-inch yet but it is past the
04:01500th I'll measure Minh lying on the
04:03scale taking the reading from the dial
04:06we have 19 the final measurement is 0.5
04:11hundred and nineteen thousand the same
04:15machine edged with depth probe this time
04:17to demonstrate the accuracy of the
04:19reading we have the same reading as
04:22previously being zero point five hundred
04:25and nineteen thousand the depth probe
04:30again to measure the inside of the
04:32threaded hole unfortunately the depth
04:34probe is thicker therefore will not fit
04:36into all small diameter holes extend it
04:40and give it plenty of length insert it
04:42and then push the frame with the caliper
04:44down against the face of the object
04:47taking the reading the reference edge
04:50still hasn't passed the one-inch mark
04:52yet on the scale but has passed the nine
04:56the reading on the dial is 63 giving us
04:59a final measurement of zero point nine
05:03six three and as you can see the depth
05:07of the probe compared to the part and
05:11finally using the inside jaws to measure
05:14a hole or bore four slots with a radius
05:17at the end or a bore you may need to
05:19rock the jaw slightly in order for them
05:21to read the maximum distance as you can
05:24see on the scale we have passed the one
05:26inch increment next we have passed the
05:29three hundred thousand this is also
05:31shown on the dial too because it is past
05:34the zero measurement with the dial
05:37reading ten our final measurement is one
05:40inch and three hundred and ten thousand
05:44final measurement using the outside jaws
05:46on the round stock before every
05:49measurement make sure the dial indicator
05:51is zeroed and both the measuring surface
05:54on the caliper and the part is clean use
05:57mild pressure on the surface and always
05:59keep that pressure consistent the
06:01reference edge determines we have seven
06:04hundred thousand after reading the dial
06:10zero point seven hundred and twenty four
06:12thousand I'll measure Minh this
06:15concludes the rest of my video I hope
06:16you enjoyed it please leave a comment
06:18below letting me know what you think and
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06:24more videos thank you for watching
